CN1919739A - Method of producing electric melting magnesium aluminum spinel - Google Patents
Method of producing electric melting magnesium aluminum spinel Download PDFInfo
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- CN1919739A CN1919739A CN 200610116287 CN200610116287A CN1919739A CN 1919739 A CN1919739 A CN 1919739A CN 200610116287 CN200610116287 CN 200610116287 CN 200610116287 A CN200610116287 A CN 200610116287A CN 1919739 A CN1919739 A CN 1919739A
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- magnesium aluminum
- electric melting
- aluminium
- melting magnesium
- aluminum spinel
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Abstract
The invention discloses a manufacturing method of electric melting magnesium aluminate spinel in the material technological domain, which comprises the following steps: sintering; placing non-disposed aluminum ash in the rotary kiln; placing aluminum ash in the groove; adding dilute acid; stirring; draining acid liquid; centrifuging; removing surface water at 200 deg.c; mixing aluminum, carbon element material and hammer slag with weight rate at 100:6-9:8-14 evenly; adding in the arc furnace; controlling pressure and current; reducing; reinforcing electric field; adding light-sintering magnesium sand with 65% Al2O3 and 30% MgO; refining; cooling the fused liquid; obtaining the magnesium aluminate spinel with Al2O3 between 63% and 67%; grinding the magnesium aluminate spinel; dehydrating; drying; proceeding magnetic cobbing.
Description
Technical field
What the present invention relates to is the method in a kind of material technology field, specifically is a kind of method of utilizing wasted aluminium ash to produce electric melting magnesium aluminum spinel.
Background technology
Produce a large amount of aluminium ashes in aluminium production and processing process, very serious to the destruction that ecotope causes, also caused the great attention of each side, form " green screen " of restriction China aluminium industrial development.The regeneration of aluminium ash is last ring of whole aluminium production and fabrication cycles chain, and according to statistics, 1000 tons of aluminium of every production will produce the aluminium ash about 25 tons.Real recoverable aluminium can only account for about 10% ~ 30% of aluminium ash weight, produces a large amount of aluminium scrap ashes after aluminium reclaims, and is deposited in plant area or landfill, not only causes the waste of resource, also causes the pollution of environment simultaneously.Therefore, realizing the use of aluminium ash resource circulation, will reduce the influence that ecotope is caused, is to solve resource, the energy and environmental restraint in economy and the social development, ensures the effective way of growing demand.
The processing mode of aluminium scrap ash mainly is to make synthesized polymer aluminum chloride (water purification agent) except that landfill both at home and abroad at present.The aluminium scrap ash is carried out landfill, and the cost height has been wasted resource, is easy to generate secondary pollution simultaneously.Produce water purification agent and produce a large amount of harmful chemical spent materials again, also have the secondary pollution problem that produces.Thereby above-mentioned solution route does not meet the requirement of ecotope.In recent years, there is the scholar to attempt both at home and abroad with the synthetic inorganic materials of making of aluminium scrap ash.
Find through literature search prior art, Liu is big strong to be waited " Harbin University of Science and Technology's journal " (1996, the second phase, the 48-50 page or leaf) " technology that the aluminium ash is produced brown corundum " delivered, propose to adopt electrosmelting technology in this article, produce brown corundum with the aluminium ash, concrete grammar is: with the reductive agent of hard coal as impurity, with iron filings as precipitation agent, with through pretreated chemical spent material aluminium ash, produce brown corundum through electrosmelting, the products obtained therefrom index has reached secondary product index (88% aluminum oxide), wherein portioned product reaches the GB1478-81 national standard of (aluminum oxide is no less than 92.5%, titanium dioxide 1.5-3.8%).Its deficiency is: the alumina content of the brown corundum of demand about 95%, because of aluminium ash composition complexity, replaces the brown corundum technical indicator of alumina production not reach market demands, application difficult as yet usually in the market.The aluminium ash that this method adopts is the aluminium scrap ash that extracted aluminium chlorohydroxide, and is under-represented.And contain a large amount of magnesium oxide in the aluminium of some areas ash composition, adopt electric smelting technology to be difficult to be processed into single corundum material.
Summary of the invention
The objective of the invention is at the problems referred to above; a kind of method of producing electric melting magnesium aluminum spinel has been proposed; making it adopt wasted aluminium ash is that starting material are produced dimension stone of magnesia alumina spinel; both reduced the cost of magnesium-aluminium spinel; consumed the wasted aluminium ash that causes environmental pollution easily again; both bring economic benefit, be beneficial to environment protection again.
The present invention is achieved by the following technical solutions, and concrete steps are:
A) calcining: the aluminium ash raw material of unprocessed mistake is dropped in the rotary kiln, calcining, Al wherein partly is transformed into Al
2O
3, form stable aluminium ash mixture.
Described calcining, its temperature are 1100 ℃.
B) pickling: the aluminium ash is put into tank, add diluted acid, at room temperature stir, bleed off acid solution, after the centrifugation, under 200 ℃, lose surface-moisture.
Described diluted acid is meant the sulfuric acid or the oxalic acid that diluted, and sulfuric acid or oxalic acid weight ratio concentration are 10～20%.
Described stirring, its time is 30min.
C) the first step electric smelting mixes aluminium ash, carbon materials, iron filings by the proportioning of mass ratio 100: 6-9: 8-14, join in the electric arc furnace, the control voltage and current carries out reduction reaction, removes the silicon-dioxide in the aluminium ash, titanium dioxide and impurity make Al in the liquation
2O
3+ MgO content is greater than 95%.
Described voltage is controlled at 60V.
Described electric current is controlled between the 1350A-1600A.
Described reduction reaction, its time is 80-100 minute.
D) the second step electric smelting increases electric field, according to Al
2O
3The composition ratio of content 65%, MgO content 30% adds caustic-calcined magnesite, carries out refining, then with liquation to going out cooling, promptly make the magnesium-aluminium spinel of alumina content between 63-67%.
Described increase electric field, current control is between 1500-2000A.
Described caustic-calcined magnesite, its aluminium ash content is 15 ~ 25%.
Described refining, its time is 30～50 minutes.
E) with the broken after washing of magnesium-aluminium spinel,,, after the drying, carry out magnetic separation, remove magnetic substance through dehydration to remove dust and spinel fine powder.
The present invention has substantive distinguishing features, by the aluminium scrap ash is calcined and pickling, obtains stay-in-grade aluminium ash, obtains the magnesium-aluminium spinel of alumina content between 63-67% by two step meltings.Magnesium-aluminium spinel is at the steel-making ladle lining, and functional refractory materials aspects such as slide gate nozzle, immerseable or long nozzle have a wide range of applications.
Embodiment
By embodiment technical scheme of the present invention is described in detail.
Embodiment 1:
Aluminium ash major ingredient: Al
2O
3Content 29.62%, Al content 22.58%, SiO
2Content 9.32%, MgO content 12.37%.
The aluminium ash is 1100 ℃ of calcinings down, in the vitriolic tank that adds 10% concentration, stirred 30 minutes under the room temperature, get 150 kilograms of aluminium ashes after the oven dry, add 12 kilograms of coke and 15 kilograms of iron filings and mix and carry out melting, add electric arc furnace, voltage 60V, electric current 1500A, melting 90 minutes increases electric current to 30 kilograms of caustic-calcined magnesites of the last adding of 1800A, after waiting to expect all to have melted, refining is 30 minutes again.Break pulverizing after the cooling, the spinel after the fragmentation is washed,,, after the drying, carry out magnetic separation, remove magnetic substance through dehydration to remove dust and spinel fine powder.
The physical and chemical index of resulting magnesium-aluminium spinel is:
Al
2O
3Content 64.62%, MgO content 31.02%, SiO
2Content 1.23%, volume density 3.42g/cm
3, apparent porosity 2.7%.
Embodiment 2:
Aluminium ash major ingredient: Al
2O
3Content 31.62%, Al content 22.35%, SiO
2Content 7.32%, MgO content 11.26%.
The aluminium ash is 1100 ℃ of calcinings down, in the tank of the oxalic acid that adds 15% concentration, stirred 30 minutes under the room temperature, get 150 kilograms of aluminium ashes after the oven dry, add 12 kilograms of coke and 15 kilograms of iron filings and mix and carry out melting, add electric arc furnace, voltage 60V, electric current 1400A, melting 80 minutes adds 30 kilograms of caustic-calcined magnesites at last, after waiting to expect all to have melted, refining is 30 minutes again.Break pulverizing after the cooling, the spinel after the fragmentation is washed,,, after the drying, carry out magnetic separation, remove magnetic substance through dehydration to remove dust and spinel fine powder.
The physical and chemical index of resulting magnesium-aluminium spinel is:
Al
2O
3Content 65.12%, MgO content 30.52%, SiO
2Content 1.35%, volume density 3.41g/cm
3, apparent porosity 2.8%.
Embodiment 3:
Aluminium ash main component: Al
2O
3Content 26.62%, Al content 22.86%, SiO
2Content 10.32%, MgO content 11.67%.
The aluminium ash is 1100 ℃ of calcinings down, in the vitriolic tank that adds 20% concentration, stirred 30 minutes under the room temperature, get 150 kilograms of aluminium ashes after the oven dry, add 12 kilograms of coke and 15 kilograms of iron filings and mix and carry out melting, add electric arc furnace, voltage 60V, electric current 1600A, melting 100 minutes adds 30 kilograms of caustic-calcined magnesites at last, after waiting to expect all to have melted, refining is 30 minutes again.Break pulverizing after the cooling, the spinel after the fragmentation is washed,,, after the drying, carry out magnetic separation, remove magnetic substance through dehydration to remove dust and spinel fine powder.
The physical and chemical index of resulting magnesium-aluminium spinel is:
Al
2O
3Content 63.62%, MgO content 32.52%, SiO
2Content 1.23%, volume density 3.42g/cm
3, apparent porosity 2.7%.
Claims (10)
1, a kind of method of producing electric melting magnesium aluminum spinel is characterized in that, concrete steps are:
A) calcining: the aluminium ash raw material of unprocessed mistake is dropped in the rotary kiln, calcining, Al wherein partly is transformed into Al
2O
3, form stable aluminium ash mixture;
B) pickling: the aluminium ash is put into tank, add diluted acid, at room temperature stir, bleed off acid solution, after the centrifugation, under 200 ℃, lose surface-moisture;
C) the first step electric smelting mixes aluminium ash, carbon materials, iron filings by the proportioning of mass ratio 100: 6-9: 8-14, join in the electric arc furnace, the control voltage and current, carry out reduction reaction, remove silicon-dioxide, titanium dioxide and impurity in the aluminium ash, make Al in the liquation
2O
3+ MgO content is greater than 95%;
D) the second step electric smelting increases electric field, according to Al
2O
3The composition ratio of content 65%, MgO content 30% adds caustic-calcined magnesite, carries out refining, then with liquation to going out cooling, make the magnesium-aluminium spinel of alumina content between 63-67%;
E) with the broken after washing of magnesium-aluminium spinel,,, after the drying, carry out magnetic separation, remove magnetic substance through dehydration to remove dust and spinel fine powder.
2, the method for production electric melting magnesium aluminum spinel according to claim 1 is characterized in that, in the step a), and described calcining, its temperature is 1100 ℃.
3, the method for production electric melting magnesium aluminum spinel according to claim 1 is characterized in that, in the step b), described diluted acid is meant the sulfuric acid or the oxalic acid that diluted, and sulfuric acid or oxalic acid weight ratio concentration are 10～20%.
4, the method for production electric melting magnesium aluminum spinel according to claim 1 is characterized in that, in the step b), and described stirring, its time is 30min.
5, the method for production electric melting magnesium aluminum spinel according to claim 1 is characterized in that, in the step c), described voltage is controlled at 60V.
6, the method for production electric melting magnesium aluminum spinel according to claim 1 is characterized in that, in the step c), described electric current is controlled between the 1350A-1600A.
7, the method for production electric melting magnesium aluminum spinel according to claim 1 is characterized in that, in the step c), and described reduction reaction, its time is 80-100 minute.
8, the method for production electric melting magnesium aluminum spinel according to claim 1 is characterized in that, in the step d), and described increase electric field, current control is between 1500-2000A.
9, the method for production electric melting magnesium aluminum spinel according to claim 1 is characterized in that, in the step d), and described caustic-calcined magnesite, its aluminium ash content is 15-25%.
10, the method for production electric melting magnesium aluminum spinel according to claim 1 is characterized in that, in the step d), and described refining, its time is 30～50 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610116287 CN1919739A (en) | 2006-09-21 | 2006-09-21 | Method of producing electric melting magnesium aluminum spinel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610116287 CN1919739A (en) | 2006-09-21 | 2006-09-21 | Method of producing electric melting magnesium aluminum spinel |
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| CN1919739A true CN1919739A (en) | 2007-02-28 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103265273A (en) * | 2013-05-29 | 2013-08-28 | 洛阳金石再生资源开发有限公司 | Treatment process of aluminum ash for producing brown fused alumina |
| CN104163647A (en) * | 2014-08-28 | 2014-11-26 | 青岛永通电梯工程有限公司 | High-purity aluminum-magnesium spinel |
| CN104177080A (en) * | 2014-08-28 | 2014-12-03 | 青岛永通电梯工程有限公司 | Novel high-purity magnesium aluminate spinel |
| CN104211415A (en) * | 2014-09-02 | 2014-12-17 | 青岛永通电梯工程有限公司 | Corundum-magnesium aluminate spinel refractory material |
| CN108585826A (en) * | 2018-05-17 | 2018-09-28 | 东北大学 | The method for preparing magnesium aluminate spinel using Quadratic aluminum dust |
| CN114907109A (en) * | 2021-02-08 | 2022-08-16 | 中国科学院过程工程研究所 | Method for preparing magnesium aluminate spinel by using aluminum ash |
-
2006
- 2006-09-21 CN CN 200610116287 patent/CN1919739A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103265273A (en) * | 2013-05-29 | 2013-08-28 | 洛阳金石再生资源开发有限公司 | Treatment process of aluminum ash for producing brown fused alumina |
| CN103265273B (en) * | 2013-05-29 | 2014-11-05 | 洛阳金石再生资源开发有限公司 | Treatment process of aluminum ash for producing brown fused alumina |
| CN104163647A (en) * | 2014-08-28 | 2014-11-26 | 青岛永通电梯工程有限公司 | High-purity aluminum-magnesium spinel |
| CN104177080A (en) * | 2014-08-28 | 2014-12-03 | 青岛永通电梯工程有限公司 | Novel high-purity magnesium aluminate spinel |
| CN104211415A (en) * | 2014-09-02 | 2014-12-17 | 青岛永通电梯工程有限公司 | Corundum-magnesium aluminate spinel refractory material |
| CN108585826A (en) * | 2018-05-17 | 2018-09-28 | 东北大学 | The method for preparing magnesium aluminate spinel using Quadratic aluminum dust |
| CN114907109A (en) * | 2021-02-08 | 2022-08-16 | 中国科学院过程工程研究所 | Method for preparing magnesium aluminate spinel by using aluminum ash |
| CN114907109B (en) * | 2021-02-08 | 2023-03-21 | 中国科学院过程工程研究所 | Method for preparing magnesium aluminate spinel by using aluminum ash |
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