CN106076613A - A kind of method recycling iron filings and prepared Al Fe intermediate alloy - Google Patents
A kind of method recycling iron filings and prepared Al Fe intermediate alloy Download PDFInfo
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- CN106076613A CN106076613A CN201610528045.5A CN201610528045A CN106076613A CN 106076613 A CN106076613 A CN 106076613A CN 201610528045 A CN201610528045 A CN 201610528045A CN 106076613 A CN106076613 A CN 106076613A
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- iron filings
- recycling
- intermediate alloy
- refining agent
- degasification
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
Abstract
The invention provides a kind of method recycling iron filings and prepared Al Fe intermediate alloy, relate to iron filings recovery technology field.The method recycling iron filings, comprises the following steps: a. is in (0.6～1.6) × 105Under the magnetic field intensity of A/M, the iron filings produced in ironwork mechanical processing process being carried out magnetic separation, then described iron filings are crushed to particle diameter is 0.1～10mm, is used as to prepare the raw material of Al Fe intermediate alloy.The method low cost that the present invention provides, technique is simple, and the ferrum element response rate is higher.
Description
Technical field
The present invention relates to iron filings recovery technology field, in particular to a kind of method recycling iron filings and prepare
Al-Fe intermediate alloy.
Background technology
Along with the fast development of mechanical industry, the iron filings produced in mechanical processing process get more and more, owing to iron filings sheet is thin,
The surface area of iron filings is big, big with air contact area, easily aoxidizes, causes damage, unsuitable long-term storage, need in time, rationally, have
Effect ground recycles.The mode of the recycling (reuse) that iron filings are conventional has: the reuse of (1) sintering, and iron filings are heated to rubescent shape
State, pressurize in mould in bulk, then melts down smelting.But because iron filings sheet is thin, heat oxidizable, and severe operational environment, this kind of side
Formula is gradually eliminated.(2) briquetting reuse, utilizes metal scrap briquetting machine or forcing press that at mould inner pressure, iron filings are made block, then
Melt down smelting, can produce by Automatic continuous.(3) smelt diluting agent, iron filings can dilute the dense of ferroalloy in corundum abrasive is smelted
Degree, improves the sense magnetic property of ferroalloy, but premise is the aluminum content in iron filings is necessarily less than 0.4%.(4) directly throw stove to use,
Iron filings are directly thrown in the elevated furnace of furnace cupola, intermediate frequency furnace or special fusing iron filings, smelt reuse.
(1st) kind of aforesaid way, (2nd) kind, (4th) kind are directed to melt down smelting, but owing to the fusing point of ferrum is up to
1535 DEG C, during refusion and smelting iron filings, need to limit inlet amount, extend fusing time.So, just increase the energy to disappear
Consumption and oxidational losses, reduce the production efficiency of smelting equipment, damages smelting equipment, and, for refusion and smelting iron filings, also need
Extra auxiliary equipment is installed, therefore iron filings recovery and energy consumption and the cost utilized are the highest.
Improved for shortcoming and the problem run in iron filings refusion and smelting reuse technology and innovated, it is proposed that being used ferrum
Bits remove to prepare afterproduct, recycle iron filings and can produce industrial chemicals or chemical reagent.Such as: (1) produces FeSO4.Utilize
Iron filings and pickle liquor reaction generate FeSO4, make FeSO4Reagent, reaches recycle iron filings and reduce the mesh of waste liquid acidity
, it is adaptable to the process of sulfuric acid washing waste water.(2) polymerization FeCl is produced3.Iron filings are reacted with technical hydrochloric acid or acid pickle, raw
Become FeCl2Solution, is passed through strong oxidizer (Cl2) time, generate more stable FeCl3, FeCl3React with iron filings, be re-converted into
FeCl2, work as FeCl2When reaching finite concentration, carry out being catalyzed, aoxidizing, generate polymerization FeCl3, so, reach purifying waste waste gas
(acid pickle, waste chlorine) and the purpose of recycling iron filings.But during above-mentioned employing iron filings prepare afterproduct, reuse work
Skill condition requires harshness, and both of which needs a series of chemical reaction, complex manufacturing.It addition, produce FeSO4Only
(even target is FeSO to be applicable to the process of sulfuric acid washing waste water4, iron filings are only applicable to obtain with sulfuric acid washing waste water reaction)；
Produce polymerization FeCl3Cl need to be passed through2As strong oxidizer, needing catalysis oxidation, equipment cost is high, it is impossible to meet large batch of simultaneously
The requirement of iron filings reuse, the ferrum element response rate is low.
Summary of the invention
It is an object of the invention to provide a kind of method recycling iron filings, the method low cost, technique is simple, ferrum unit
The element response rate is higher.
Another object of the present invention is to provide a kind of Al-Fe intermediate alloy, this Al-Fe intermediate alloy low cost, be suitable for
In commercial production.
The present invention solves it and technical problem is that and realize by the following technical solutions:
A kind of method recycling iron filings, comprises the following steps:
A. in (0.6～1.6) × 105Under the magnetic field intensity of A/M, the iron filings produced in ironwork mechanical processing process are entered
Row magnetic separation, then iron filings are crushed to particle diameter is 0.1～10mm, is used as to prepare the raw material of Al-Fe intermediate alloy.
Preferably, in present pre-ferred embodiments, the preparation method of above-mentioned Al-Fe intermediate alloy is:
B. according to chemical formula AlFenIron filings after weighing aluminum material and pulverizing, wherein, n is the integer in 5～20；
C., after aluminum material being melted, add refining agent, obtain fused mass；
D. fused mass is warming up to 905～915 DEG C, is incubated 5～10min, is subsequently adding the iron filings after pulverizing, and makes iron filings
It is positioned at 1/2 position below of melt height, after iron filings dissolve, stirring, obtain mixture；
E. mixture is carried out dehydrogenation, casting.
Preferably, in present pre-ferred embodiments, above-mentioned refining agent is 0.3～0.5:100 with the mass ratio of aluminum material.
Preferably, in present pre-ferred embodiments, in above-mentioned steps c, refining agent is the refining agent through the pre-heat treatment,
The pre-heat treatment includes: heat at 110～120 DEG C, until the water content in refining agent is below 0.5%.
Preferably, in present pre-ferred embodiments, above-mentioned steps d farther includes:
D1. fused mass is warming up to 905～915 DEG C, be incubated 5～10min, then by bell jar plunging add 40～
Iron filings after the pulverizing of 60wt%, and make iron filings be positioned at 1/2 position below of melt height, after iron filings dissolve, stirring；
It is warming up to 905～915 DEG C the most again, is incubated 5～10min, is then added the pulverizing of surplus by bell jar plunging
After iron filings, and make iron filings be positioned at 1/2 position below of melt height, after iron filings dissolve, stirring obtains mixture.
Preferably, in present pre-ferred embodiments, in above-mentioned steps e, dehydrogenation includes: adjusting mixture temperature is
760～780 DEG C, standing 3～5min, then skimming, degasification.
Preferably, in present pre-ferred embodiments, above-mentioned degasification includes: utilize getter to be passed through degasification gas, until
The hydrogen content of mixture, at below 0.2mL/100gAl, then stands 10～15min, skimming.
Preferably, in present pre-ferred embodiments, above-mentioned degasification gas is selected from nitrogen, noble gas, chlorine
Kind or multiple, preferably nitrogen and chlorine are according to the mixture of volume ratio 20～50:1.
Preferably, in present pre-ferred embodiments, above-mentioned getter includes breather plug and gas blow pipe, breather plug and air blowing
Pipe connects, and the consent aperture of breather plug is 20～140 μm.
It addition, a kind of Al-Fe intermediate alloy, prepared by the above-mentioned method recycling iron filings.
Relative to prior art, the present invention includes following beneficial effect: ironwork is produced in the course of processing by the present invention
Iron filings re-use, go out, with aluminum co-manufactured, the ferro-aluminum intermediate alloy that a kind of price is relatively low and up-to-standard.Existing
In technology to the recovery utilization rate of ferrum element below 85%, and in the method recycling iron filings that the present invention provides, ferrum unit
Element recovery utilization rate can reach more than 94%.
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearer, below will be in the embodiment of the present invention
Technical scheme be clearly and completely described.In embodiment, unreceipted actual conditions person, builds according to normal condition or manufacturer
The condition of view is carried out.Agents useful for same or instrument unreceipted production firm person, being can be by the commercially available conventional product bought and obtain
Product.
Method and prepared Al-Fe intermediate alloy that the embodiment of the present invention recycles iron filings below are carried out specifically
Bright.
The method recycling iron filings comprises the following steps:
Step A: in (0.6～1.6) × 105Under the magnetic field intensity of A/M, to the ferrum produced in ironwork mechanical processing process
Bits carry out magnetic separation, and then iron filings are crushed to particle diameter is 0.1～10mm, are used as to prepare the raw material of Al-Fe intermediate alloy.
The iron filings produced in production and processing are carried out magnetic separation, and the magnetic field intensity of working clearance is (0.6～1.6) × 105A/
M, separates iron filings and nonmetallic inclusion with this.Wherein, magnetic separator can select low-intensity (magnetic) separator.And in order to obtain preferably
Separating effect, can repeat magnetic separation 1～2 times, until free from admixture in iron filings.
And after magnetic separation, it is also possible to iron filings carrying out oil removing, then dries, iron filings are ground into particle diameter by recycling disintegrating machine
It it is the crumble of 0.1～10mm.Wherein it is possible to carry out oil removing by the way of alkali cleaning.Oil removing, dry, the operation pulverized is provided to
Obtain free from admixture, the iron filings crumble that bright and clean, particle diameter is little, using ensure its as raw material manufacture intermediate alloy time, it is possible to prepare product
Matter measured ferro-aluminum intermediate alloy.
The preparation method of above-mentioned Al-Fe intermediate alloy includes step B: according to chemical formula AlFenAfter weighing aluminum material and pulverizing
Iron filings, wherein, n is the integer in 5～20.
Wherein, aluminum material preferred aluminium ingot bar.
The preparation method of above-mentioned Al-Fe intermediate alloy includes step C: after being melted by aluminum material, adds refining agent, is melted
Thing.
Melting aluminum material is preferably carried out in smelting furnace.If select is aluminium ingot bar, then can be in smelting furnace, along furnace wall
Arrangement aluminium ingot bar, after aluminium ingot bar melts, aluminum liquid surface the most after being melted down sprinkles refining agent uniformly.
Wherein, refining agent is 0.3～0.5:100 with the mass ratio of aluminum material.Refining agent is made up of following raw material, and by weight hundred
Mark meter: sodium chloride 40～43%, hexafluoro sodium aluminate 5.7～6.6%, calcium fluoride 4.2～4.4%, prodan 0～0.5%,
Magnesium chloride 0～0.5%, barium chloride 0～0.5% and potassium chloride surplus.It is highly preferred that sodium chloride 40～43%, hexafluoro sodium aluminate
5.7～6.6%, calcium fluoride 4.2～4.4%, prodan 0～0.3%, magnesium chloride 0～0.3%, barium chloride 0～0.3% and
Potassium chloride surplus.It is of course also possible to select other refining agent, as long as be applicable to the refining agent that alfer manufactures.
Refining agent is the refining agent through the pre-heat treatment, and the pre-heat treatment includes: heat at 110～120 DEG C, until refine
Water content in agent is below 0.5%.Refining agent easily absorbs water, and too much moisture can affect the Al-Fe intermediate alloy of preparation
Quality, so the pre-heat treatment is primarily to the moisture removed in refining agent.The general process time is at more than 30min.
The preparation method of above-mentioned Al-Fe intermediate alloy includes step D: fused mass is warming up to 905～915 DEG C, insulation 5～
10min, is subsequently adding the iron filings after pulverizing, and makes iron filings be positioned at 1/2 position below of melt height, treat that iron filings dissolve
After, stirring, obtain mixture.
During existing making Al-Fe intermediate alloy, more than 1150 DEG C need to be heated to, then ferrum is dissolved.And this
In invention, the heating-up temperature related in whole technique is only below 950 DEG C, so, just reduces the requirement to equipment, reduces
Energy consumption, has saved production cost.
Wherein, when adding iron filings, added at twice by bell jar plunging.Open owing to liquid surface exists surface
Power, so being directly added into iron filings, it may float on liquid surface, and is difficult to merge uniformly with liquid, by bell jar toward liquid
Or the press-in in fused mass, add raw material, and make the raw material of addition submerge in liquid melt, it becomes possible to promote iron filings and liquid
Fusion between body.And bell jar is conventional equipment, in industry manufactures, if disposably adding raw material, then the bell jar needed is just
Relatively big, and big bell jar is toward during being pushed down into, and can occupy most of volume of container, cause the liquid in container to escape
Go out, so that the raw material just added incidentally is escaped by fused mass, so, have led to the loss of raw material, so, divide two by iron filings
Secondary addition, avoids the use to bigger bell jar, also avoids the loss of raw material effusion.
The bell jar of cast iron selected by bell jar, so, it is possible to avoid introducing other material, causes other to react.
Fashionable adding, bell jar can be kept to be pressed into always, until make iron filings be positioned at melt height less than 1/2 position
Put, namely the middle and lower part of fused mass.So, it is possible to make iron filings be substantially soluble in fused mass, make the two mixing preferably, to ensure
The quality of the alfer prepared.Fashionable adding, can keep at the bottom of bell jar distance from bottom smelting furnace is 80～120mm, with this
Meeting the requirement that iron filings are positioned at 1/2 position below of melt height, certainly, this kind of distance limits and is not intended as limiting,
Need to determine according to actual smelting furnace size and bell jar size.After adding iron filings, move bell jar gently, treat that iron filings all dissolve
After, blowing out, the speed with 5～10cm/s stirs 1～2min, obtains mixture.Wherein, stirring rod is the stirring rod of cast iron.
Alternatively, it is also possible to add iron filings by other method.
If adding iron filings at twice, then step D farther includes:
D1. fused mass is warming up to 905～915 DEG C, be incubated 5～10min, then by bell jar plunging add 40～
Iron filings after the pulverizing of 60wt%, and make iron filings be positioned at 1/2 position below of melt height, after iron filings dissolve, stirring；
It is warming up to 905～915 DEG C the most again, is incubated 5～10min, is then added the pulverizing of surplus by bell jar plunging
After iron filings, and make iron filings be positioned at 1/2 position below of melt height, after iron filings dissolve, stirring obtains mixture.
In step D1, adding the iron filings after pulverizing by bell jar plunging, the addition of iron filings is preferably iron filings total amount
50%.
The preparation method of above-mentioned Al-Fe intermediate alloy includes step E: mixture carries out dehydrogenation, casting.
Wherein, dehydrogenation includes: adjusting mixture temperature is 760～780 DEG C, standing 3～5min, and then skimming removes
Gas.If temperature is the highest, then in mixture, the meltage of hydrogen is the biggest, and its residual in intermediate alloy is the most more, can affect
The quality of intermediate alloy, and the operation being cooled to 760～780 DEG C just can effectively reduce hydrogen content.And gas is from mixture
There is a process in effusion, so needing to stand 3～5min, then excludes impurity, the bits produced in mixture.
And degasification includes: utilize getter to be passed through degasification gas, until the hydrogen content of mixture 0.2mL/100gAl with
Under (in i.e. every 100g aluminum, hydrogen content is at below 0.2mL), then stand 10～15min, skimming.Degasification gas is selected from nitrogen, lazy
Property gas, chlorine in one or more, preferably nitrogen and chlorine are according to the mixture of volume ratio 20～50:1.This kind of degasification gas
The degassing effect of body is more preferable.Degasification reduces the hydrogen content of mixture, it is possible to obtain up-to-standard ferro-aluminum intermediate alloy.Getter
Preferably rotary degassing machine.During test hydrogen content, it is possible to use hydrogen meter is tested.
Getter includes breather plug and gas blow pipe, and breather plug is connected with gas blow pipe, and the consent aperture of breather plug is 20～140
μm.When the degasification gas of getter is escaped from breather plug outward by gas blow pipe, the aperture of breather plug is the least, say, that
The gas outlet of degasification gas is the least, so, it becomes possible to reduce the size of the bubble emerged.And by reducing bubble diameter, this
The surface that bubbles are total a bit actively increases severely greatly, and this allows for more degasification bubble surface and contacts with the hydrogen in mixture, impurity,
Thus these harmful substances are taken to liquid surface.Wherein, breather plug can be that [porous graphite refers to total pore to porous graphite plug
Rate is more than 45%, and bulk density is less than 1.20g/cm3Carbon product, heat treatment temperature reach graphitization temperature (2200～
3000 DEG C) be referred to as porous graphite].It is of course also possible to be other, the ventilation that the refractory material required as met aperture makes
Plug.
Getter is being utilized to be passed through degasification gas, until the hydrogen content of mixture is (the most every at below 0.2mL/100gAl
In 100g aluminum, hydrogen content is at below 0.2mL), then stand 10～15min, after skimming, by being cast into ingot, it is possible to
To Al-Fe intermediate alloy.
Compared with iron filings refusion and smelting reuse, in the method preparing Al-Fe intermediate alloy that the present invention provides, melt step
Temperature relatively low, energy resource consumption reduces, and oxidational losses reduces, and reduces the requirement of equipment, and the expense of equipment reduces accordingly, iron filings
The response rate be greatly improved.And because raw material uses iron filings, so the life of ferro-aluminum intermediate alloy is greatly reduced
Produce cost.Compared with using iron filings production industrial chemicals or chemical reagent, the method is without carrying out a series of chemical reaction, raw
Production. art is simple, can meet the requirement of large batch of iron filings reuse.
The Al-Fe intermediate alloy that the present invention provides, is to be prepared by the above-mentioned method recycling iron filings.
Below in conjunction with embodiment, inventive feature and performance are described in further detail:
Embodiment one
Present embodiments provide and utilize the method recycling iron filings to prepare AlFe5Intermediate alloy, comprises the following steps:
A. the iron filings produced in mechanical processing process are collected, magnetic separator carries out magnetic separation, selection work gap
Magnetic field intensity be 0.9 × 105A/M, separates iron filings and nonmetal inclusion；
Iron filings oil removing post-drying after processing magnetic separation, pulverizes on disintegrating machine, is ground into the bits of a size of 5mm
Material；
The most stoichiometrically AlFe5Iron filings after weighing fine aluminium ingot and pulverizing；
C. in smelting furnace, aluminium ingot bar is arranged along furnace wall, after aluminium ingot bar all melts, equal on the aluminum liquid surface obtained
Even sprinkle refining agent, obtain fused mass；Wherein, refining agent is the refining agent (refining agent at 110 DEG C after the pre-heat treatment 40min
Water content is 0.35%), refining agent is made up of following raw material, percentage: the KCl of 47.4%, the NaCl of 41.5%,
The Na of 6.2%3AlF6, the CaF of 4.3%2, the Na of 0.2%2SiF6, the MgCl of 0.2%2With 0.2% BaCl2；
D. fused mass is warming up to 905 DEG C, is incubated 5min, utilize the iron filings that bell jar plunging adds 1/2, away from smelting furnace
At end 100mm, moving bell jar, after iron filings all dissolve, blowing out gently, cylinder iron stirring rod stirs with the speed of 5cm/s
1min；Wherein, bell jar is cast iron bell jar；
Again smelting furnace is warming up to 905 DEG C, is incubated 5min, utilize bell jar plunging to add remaining iron filings, away from melting
At furnace bottom 100mm, moving bell jar, after iron filings all dissolve, blowing out gently, cylinder iron stirring rod stirs with the speed of 5cm/s
3min, obtains mixture；Wherein, bell jar is cast iron bell jar；
E. mixture temperature is adjusted to 760 DEG C, stands skimming after 3min, then utilize rotary degassing machine to be passed through degasification gas
Body, carries out degasification, period, utilizes hydrogen meter to measure hydrogen content, when the hydrogen content of mixture is 0.1mL/100gAl, stops removing
Gas, stands skimming after 10min, is cast into ingot；Wherein, degasification gas is N2、Cl2According to the mixed gas of volume ratio 40:1 proportioning,
The gas blow pipe of rotary degassing machine is connected with breather plug, and breather plug is porous graphite plug.
According to the method described above, the present embodiment, in the case of iron filings addition somewhat changes (only one variable), have recorded
Data below, sees table 1:
Table 1
Embodiment two
On the basis of embodiment one, present embodiments provide and utilize the method recycling iron filings to prepare AlFe10Middle
Alloy, the method only step b, iron filings addition are different from embodiment one, remaining operation, condition all with embodiment one phase
With.In the present embodiment, step b is: stoichiometrically AlFe10Iron filings after weighing fine aluminium ingot and pulverizing.
The present embodiment, in the case of iron filings addition somewhat changes (only one variable), have recorded data below, sees
Table 2:
Table 2
Embodiment three
On the basis of embodiment one, present embodiments provide and utilize the method recycling iron filings to prepare AlFe15Middle
Alloy, the method only step b, iron filings addition are different from embodiment one, remaining operation, condition all with embodiment one phase
With.In the present embodiment, step b is: stoichiometrically AlFe15Iron filings after weighing fine aluminium ingot and pulverizing.
The present embodiment, in the case of iron filings addition somewhat changes (only one variable), have recorded data below, sees
Table 3:
Table 3
Embodiment four
Present embodiments provide and utilize the method recycling iron filings to prepare AlFe20Intermediate alloy, comprises the following steps:
A. removing the impurity in the iron filings produced in ironwork mechanical processing process, then iron filings are crushed to particle diameter is
10mm；
The most stoichiometrically AlFe20Weigh fine aluminium ingot and iron filings；
C. in smelting furnace, aluminium ingot bar is arranged along furnace wall, after aluminium ingot bar all melts, equal on the aluminum liquid surface obtained
Even sprinkle refining agent, obtain fused mass；Wherein, refining agent is 0.5:100 with the mass ratio of aluminium ingot bar, and refining agent is by following raw material
Make, percentage: the KCl of 46%, the NaCl of 43%, the Na of 6.6%3AlF6With 4.4% CaF2；
D. fused mass is warming up to 915 DEG C, is incubated 10min, utilize the iron filings that bell jar plunging adds 60%, and make iron filings
Being positioned at the 1/2 of melt height, move bell jar, after iron filings all dissolve, blowing out gently, cylinder iron stirring rod is with 10cm/s's
Speed stirring 1min, obtains primary mix；Wherein, bell jar is cast iron bell jar；
Again smelting furnace is warming up to 915 DEG C, is incubated 10min, utilize bell jar plunging to add remaining iron filings, and make iron filings
Be positioned at the 1/2 of primary mix height, move bell jar, after iron filings all dissolve, blowing out gently, cylinder iron stirring rod with
The speed stirring 3min of 10cm/s, obtains mixture；Wherein, bell jar is cast iron bell jar；
E. mixture temperature is adjusted to 780 DEG C, stands skimming after 5min, then utilize rotary degassing machine to be passed through degasification gas
Body, carries out degasification, period, utilizes hydrogen meter to measure hydrogen content, when the hydrogen content of mixture is 0.2mL/100gAl, stops removing
Gas, stands skimming after 15min, is cast into ingot；Wherein, degasification gas is N2。
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, that is made any repaiies
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (10)
1. the method recycling iron filings, it is characterised in that comprise the following steps:
A. in (0.6～1.6) × 105Under the magnetic field intensity of A/M, the iron filings produced in ironwork mechanical processing process are carried out magnetic
Choosing, then described iron filings are crushed to particle diameter is 0.1～10mm, is used as to prepare the raw material of Al-Fe intermediate alloy.
The method of recycling iron filings the most according to claim 1, it is characterised in that the system of described Al-Fe intermediate alloy
Preparation Method is:
B. according to chemical formula AlFenWeighing the iron filings after aluminum material and described pulverizing, wherein, n is the integer in 5～20；
C., after described aluminum material being melted, add refining agent, obtain fused mass；
D. described fused mass is warming up to 905～915 DEG C, is incubated 5～10min, is subsequently adding the iron filings after described pulverizing, and makes
Iron filings are positioned at 1/2 position below of described melt height, after iron filings dissolve, and stirring, obtain mixture；
E. described mixture is carried out dehydrogenation, casting.
The method of recycling iron filings the most according to claim 2, it is characterised in that in described step c, described refining agent
It is 0.3～0.5:100 with the mass ratio of described aluminum material.
The method of recycling iron filings the most according to claim 2, it is characterised in that in described step c, described refining agent
For the refining agent through the pre-heat treatment, described the pre-heat treatment includes: heat at 110～120 DEG C, until in described refining agent
Water content is below 0.5%.
The method of recycling iron filings the most according to claim 2, it is characterised in that described step d farther includes:
D1. described fused mass is warming up to 905～915 DEG C, be incubated 5～10min, then by bell jar plunging add 40～
Iron filings after the described pulverizing of 60wt%, and make iron filings be positioned at 1/2 position below of described melt height, treat that iron filings dissolve
After, stirring；
It is warming up to 905～915 DEG C the most again, is incubated 5～10min, is then added the described pulverizing of surplus by bell jar plunging
After iron filings, and make iron filings be positioned at 1/2 position below of described melt height, after iron filings dissolve, stirring is mixed
Thing.
The method of recycling iron filings the most according to claim 2, it is characterised in that in described step e, at described dehydrogenation
Reason includes: adjusting described mixture temperature is 760～780 DEG C, standing 3～5min, then skimming, degasification.
The method of recycling iron filings the most according to claim 6, it is characterised in that described degasification includes: utilize degasification
Machine is passed through degasification gas, until the hydrogen content of described mixture is at below 0.2mL/100gAl, then stands 10～15min, skims
Slag.
The method of recycling iron filings the most according to claim 7, it is characterised in that described degasification gas selected from nitrogen,
One or more in noble gas, chlorine, preferably nitrogen and chlorine are according to the mixture of volume ratio 20～50:1.
The method of recycling iron filings the most according to claim 7, it is characterised in that described getter include breather plug and
Gas blow pipe, described breather plug is connected with described gas blow pipe, and the consent aperture of described breather plug is 20～140 μm.
10. an Al-Fe intermediate alloy, it is characterised in that by the recycling iron filings described in any one of claim 1～9
Method prepare.
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| CN106076613B (en) | 2018-08-17 |
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