CN103265273A - Treatment process of aluminum ash for producing brown fused alumina - Google Patents
Treatment process of aluminum ash for producing brown fused alumina Download PDFInfo
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- CN103265273A CN103265273A CN2013102059378A CN201310205937A CN103265273A CN 103265273 A CN103265273 A CN 103265273A CN 2013102059378 A CN2013102059378 A CN 2013102059378A CN 201310205937 A CN201310205937 A CN 201310205937A CN 103265273 A CN103265273 A CN 103265273A
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Abstract
The invention relates to a treatment process of aluminum ash for producing brown fused alumina. The treatment process comprises the following steps of: adding aluminum ash into hot water, and then putting the mixture into a container, which is communicated with the outside, to react for a period of time; discharging the hot water in the plastic container, adding hot water which is equal in weight with the discharged water, and standing for a period of time; separating the aluminum ash out, and rinsing the aluminum ash with water; and filtering by using a vacuum filter, and drying the obtained aluminum ash to finish the treatment of the aluminum ash. After the aluminum ash is treated by using the treatment process, the impurities are removed, the content of aluminum oxide is improved, low-temperature smelting is realized, the content of aluminum oxide in a product is 96.5%, the hardness and abrasion resistance of a product are greatly improved, a carbon source is not introduced, the carbon content in the product is greatly reduced, and the high-temperature resistance of the product is improved.
Description
Technical field
The present invention relates to the production field of brown corundum material, produce the treatment process that brown corundum is used the aluminium ash specifically.
Background technology
The palm fibre corundum is to be main raw material with bauxitic clay, coke (hard coal), in electric arc furnace, form through pyrotic smelting, with the grinding tool that it is made, be suitable for the anti-higher metal of grinding, as various general steel, malleable iron, hard bronze etc., also can make high grade refractory.
The palm fibre corundum is made of Alpha-alumina crystal grain, sticked together by a spot of glassy slag, the glassy slag overwhelming majority is made up of silicon-dioxide, titanium dioxide, and Alpha-alumina influences hardness and the fusing point of brown corundum material, and glassy slag is given brown corundum toughness and crush resistance.Because glassy slag has lower solubleness in Alpha-alumina, if silicon-dioxide is too much, then can generate mullite with aluminum oxide, reduce the toughness of brown corundum; If titanium dioxide is too much, then can generate aluminium titanates with aluminum oxide, cause the Alpha-alumina intercrystalline crackle to occur, reduce the intensity of brown corundum.
The aluminium ash is the product of slag after cooling processing that produces in electrolytic aluminum or the casting aluminium production technique, and its main component is metallic aluminium, aluminium sesquioxide, silicon-dioxide, calcium oxide, magnesium oxide and ferric oxide etc.
Owing to contain aluminum oxide in the aluminium ash, therefore can be used for preparing brown corundum by the substitution of Al alumina, prior art also has relevant paper publishing and patent disclosure, but because wherein impure particularly silicon-dioxide and ferric oxide, therefore need to use a large amount of iron filings and carbon granules to remove this two kinds of impurity, cause the content of carbon, silicon and iron in the brown corundum of final production higher, the content of aluminum oxide is lower, and then causes intensity, hardness and the wear resisting property of product all relatively poor.Simultaneously, owing to itself contain uncombined carbon in the aluminium ash, this part uncombined carbon can not produce reductive action in smelting process, and still the form with uncombined carbon remains in the brown corundum.When brown corundum was used for refractory materials, the uncombined carbon of this part was oxidized to the gas discharge under the hot environment, makes refractory materials the foaming phenomenon occur, has greatly reduced resistance to elevated temperatures and work-ing life.
Summary of the invention
Use foreign matter content height in the brown corundum of aluminium ash production, the low poor-performing problem that causes of alumina content in order to solve prior art, the invention provides a kind for the treatment of process that brown corundum is used the aluminium ash of producing, the aluminium ash that process present method was handled, reduced the wherein content of impurity, improved the content of aluminum oxide, use this aluminium ash to produce brown corundum, not only reduced raw-material consumption, saved the energy, and improved the content of aluminum oxide in the finished product, reduce the content of silicon, iron and carbon, improved wear resistance, intensity and the high thermal resistance of product.
The present invention solves the problems of the technologies described above the technical scheme of employing to be: produce the treatment process that brown corundum is used the aluminium ash, may further comprise the steps:
1) by weight, be that aluminium ash below 150 orders is put into the hot water of 90-100 ℃ of 2-5 part and is transferred to the container that communicates with the external world rapidly and places 6-10h with 1 part of fineness, standby;
2) water in the container is discharged, and 90-100 ℃ of heavy hot-water soak 2-14h such as adding and the discharge water yield, keeping water temperature between soak period is 90-100 ℃, standby;
3) with step 2) in the aluminium ash content use water rinse from the back of coming out, re-use that vacuum filter filters and the aluminium ash that obtains is dried the processing of namely finishing the aluminium ash.
Described step 2) keeps during the hot-water soak in stirring to guarantee that the aluminium ash does not deposit in hot water.
The speed of current is 3-6m/min during described rinsing.
Aluminium ash after described vacuum filter filters is dried under 80-110 ℃ condition to water ratio and is lower than 20%.
Among the present invention, the aluminium ash is added to the water, because heat is emitted in the calcium oxide that wherein contains and water reaction, make temperature remain on about 100 ℃, under this environment, make the trace metal alumina that contains in the aluminium ash change into aluminum oxide, make that the ammonia that contains in the aluminium ash is soluble in water to be removed, the calcium hydroxide that calcium oxide and water generate and silicon oxide reaction generate Calucium Silicate powder and are attached to the calcium hydroxide surface, become big in conjunction with the back volume, density diminishes, and can remove by rinsing then, so just reduced the content of silicon oxide and calcium oxide, so not only reduced the temperature (can smelt 2000 ℃ of requirements when smelting far below routine for 1700-1800 ℃) when smelting, also corresponding minimizing tap to tap time (approximately 6-8h gets final product), reduced energy consumption, and, owing to reduced the content of oxidation of impurities silicon, make the brown corundum toughness of final production increase;
Simultaneously, under the said temperature condition, place after for some time, just can make passage that the uncombined carbon that contains in the aluminium ash distributes by means of ammonia overflow and attach surface at the aluminium ash from the aluminium ash is inner, after being filtered out by vacuum filter with the aluminium ash, become the reductive agent of smelting process, not only in smelting process, need not add carbon, and reduce the impurity carbon content, prevent that uncombined carbon is oxidized to the foaming phenomenon that gas causes under hot conditions; Proper extension storage period and when placing, add stirring operation and can make the effusion of uncombined carbon more thorough;
Owing to reduced the content of silicon oxide in the raw material aluminium ash, make the iron filings amount that adds when smelting also reduce relatively, thereby the iron amount that retains in the product palm fibre corundum is reduced, improved the intensity of brown corundum.
Among the present invention, the aluminium ash after filtering through vacuum filter needs oven dry, so that the aluminium ash fully disperses when smelting and do not reunite, makes its surperficial uncombined carbon fully participate in reaction, also makes being more evenly distributed of aluminum oxide in the product palm fibre corundum simultaneously.
Among the present invention, the current during rinsing are unsuitable too fast, are flushed away to prevent a large amount of uncombined carbons, experiment showed, that the speed of current is advisable with 3-6m/min.
Beneficial effect: the present invention compared with prior art has the following advantages:
1, owing to re-use after adopting aforesaid method that the aluminium ash is handled, removed the ammonia in the aluminium ash, prevent the corrosion of equipment, and make the inner uncombined carbon of aluminium ash shift and be attached to the aluminium gray surface as reductive agent participation reaction, avoided the introducing of external carbon source, make also that simultaneously the content of aluminum oxide brings up to 96.5% in the product, siliceous 0.95%, iron content 0.03%, titaniferous 1.65%, and the content of aluminum oxide is 94.53% in the brown corundum that the aluminium ash that the Comparative Examples employing is handled without the present invention makes, siliceous 1.49%, iron content 0.14%, titaniferous 2.42%, both compare, the impurity silicone content has reduced by 36%, improved the toughness of brown corundum greatly, impurity iron content has reduced by 78.6%, the impurity titanium content has reduced by 31.8%, has improved the wear resistance of brown corundum greatly, intensity and hardness;
2, because the particularly minimizing of silicon oxide and calcium oxide content of impurity in the aluminium ash makes that the temperature when smelting is reduced to 1700-1800 ℃, also corresponding minimizing tap to tap time (approximately 6-8h gets final product) has reduced energy consumption;
3, because the employing aforesaid method has reduced the foreign matter content in the aluminium ash, reduced the consumption of iron filings, and do not consume extra carbon, not only reduced raw-material consumption, and reduced the content of iron and carbon in the finished product, prevent because the phenomenon of bubbling under the high temperature that the carbon content height causes, improved the resistance to elevated temperatures of product, detecting the back finds, C content is 0.13% in the brown corundum that the aluminium ash that uses the inventive method to handle synthesizes, and C content is 0.53% in the brown corundum that the aluminium ash that the Comparative Examples use was handled without the inventive method synthesizes, and carbon content has reduced by 75.5%.
Description of drawings
Fig. 1 detects table for the main component of using the grey brown corundum of handling through the inventive method that synthesizes of aluminium;
Fig. 2 detects table for the main component of using the grey brown corundum of handling without the inventive method that synthesizes of aluminium.
Embodiment
The present invention is further elaborated below in conjunction with specific embodiment.
The aluminium ash that adopts among the following embodiment is the waste of electrolytic aluminium factory, and has passed through the operation of separating metal aluminium.
Embodiment 1
Produce the brown corundum treatment process of aluminium ash, may further comprise the steps:
1) by weight, be that aluminium ash below 150 orders is put into 2 parts 90 ℃ hot water and is transferred to the container that communicates with the external world rapidly and places 6h with 1 part of fineness, standby;
2) water in the container is discharged, and add the 90 ℃ hot-water soak 14hs heavy with discharging the water yield etc., keeping water temperature between soak period is that 90 ℃ and stirring do not deposit the aluminium ash in the water, standby;
3) with step 2) in the aluminium ash content use water rinse from the back of coming out, flow velocity is 3m/min during rinsing, re-uses vacuum filter filtration and the aluminium ash that obtains dried under 80 ℃ condition to water ratio to be lower than 20% processing of namely finishing the aluminium ash.
Embodiment 2
Produce the brown corundum treatment process of aluminium ash, may further comprise the steps:
1) by weight, be that aluminium ash below 150 orders is put into 5 parts 100 ℃ hot water and is transferred to the container that communicates with the external world rapidly and places 10h with 1 part of fineness, standby;
2) water in the container is discharged, and 100 ℃ of heavy hot-water soak 2h such as adding and the discharge water yield, keeping water temperature between soak period is 100 ℃, standby;
3) with step 2) in the aluminium ash content use water rinse from the back of coming out, flow velocity is 6m/min during rinsing, re-uses vacuum filter filtration and the aluminium ash that obtains dried under 110 ℃ condition to water ratio to be lower than 20% processing of namely finishing the aluminium ash.
Embodiment 3
Produce the brown corundum treatment process of aluminium ash, may further comprise the steps:
1) by weight, be that aluminium ash below 150 orders is put into 3.5 parts 95 ℃ hot water and is transferred to the container that communicates with the external world rapidly and places 8h with 1 part of fineness, standby;
2) water in the container is discharged, and 95 ℃ of heavy hot-water soak 8h such as adding and the discharge water yield, keeping water temperature between soak period is 95 ℃, standby;
3) with step 2) in the aluminium ash content use water rinse from the back of coming out, flow velocity is 4.5m/min during rinsing, re-uses vacuum filter filtration and the aluminium ash that obtains dried under 95 ℃ condition to water ratio to be lower than 20% processing of namely finishing the aluminium ash.
Comparative Examples
Aluminium ash water is cleaned the back oven dry, adopt ordinary method to smelt brown corundum then, namely add carbon dust and iron filings are smelted in electric arc furnace.
Claims (4)
1. produce brown corundum with the treatment process of aluminium ash, it is characterized in that, may further comprise the steps:
1) by weight, be that aluminium ash below 150 orders is put into the hot water of 90-100 ℃ of 2-5 part and is transferred to the container that communicates with the external world rapidly and places 6-10h with 1 part of fineness, standby;
2) water in the container is discharged, and 90-100 ℃ of heavy hot-water soak 2-14h such as adding and the discharge water yield, keeping water temperature between soak period is 90-100 ℃, standby;
3) with step 2) in the aluminium ash content use water rinse from the back of coming out, re-use that vacuum filter filters and the aluminium ash that obtains is dried the processing of namely finishing the aluminium ash.
2. the brown corundum of production according to claim 1 is characterized in that: keep during the hot-water soak described step 2) stirring to guarantee that the aluminium ash does not deposit in hot water with the treatment process of aluminium ash.
3. the brown corundum of production according to claim 1 is characterized in that with the treatment process of aluminium ash: the speed of current is 3-6m/min during described rinsing.
4. the brown corundum of production according to claim 1 is characterized in that with the treatment process of aluminium ash: the aluminium ash after described vacuum filter filters is dried under 80-110 ℃ condition to water ratio and is lower than 20%.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104692427A (en) * | 2015-02-11 | 2015-06-10 | 河南东风新研材科技有限公司 | Brown aluminum oxide smelting process |
| CN111573701A (en) * | 2020-05-20 | 2020-08-25 | 沈阳益富冶炼技术装备有限公司 | Method for preparing brown corundum production raw material by using aluminum ash |
| CN112194159A (en) * | 2020-09-28 | 2021-01-08 | 江西省科学院应用物理研究所 | Harmless recycling treatment process for secondary aluminum ash |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1919739A (en) * | 2006-09-21 | 2007-02-28 | 上海交通大学 | Method of producing electric melting magnesium aluminum spinel |
| CN1927770A (en) * | 2006-09-21 | 2007-03-14 | 上海交通大学 | Method of preparing fireproof raw material from wasted aluminium ash |
| CN102828028A (en) * | 2011-06-18 | 2012-12-19 | 于斌 | Comprehensive treatment technology of waste aluminum ash |
-
2013
- 2013-05-29 CN CN201310205937.8A patent/CN103265273B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1919739A (en) * | 2006-09-21 | 2007-02-28 | 上海交通大学 | Method of producing electric melting magnesium aluminum spinel |
| CN1927770A (en) * | 2006-09-21 | 2007-03-14 | 上海交通大学 | Method of preparing fireproof raw material from wasted aluminium ash |
| CN102828028A (en) * | 2011-06-18 | 2012-12-19 | 于斌 | Comprehensive treatment technology of waste aluminum ash |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104692427A (en) * | 2015-02-11 | 2015-06-10 | 河南东风新研材科技有限公司 | Brown aluminum oxide smelting process |
| CN111573701A (en) * | 2020-05-20 | 2020-08-25 | 沈阳益富冶炼技术装备有限公司 | Method for preparing brown corundum production raw material by using aluminum ash |
| CN112194159A (en) * | 2020-09-28 | 2021-01-08 | 江西省科学院应用物理研究所 | Harmless recycling treatment process for secondary aluminum ash |
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Inventor after: Zhi Guobiao Inventor after: Zhi Libiao Inventor after: Zhi Canbiao Inventor after: Liu Ruiqiong Inventor before: Zhi Guobiao Inventor before: Zhi Libiao Inventor before: Zhi Canbiao |
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Effective date of registration: 20200608 Address after: 471200 50 meters east of Ru'an Road, Ruyang County, Neibu Township, Ruyang County, Luoyang City, Henan Province Patentee after: Luoyang Zhiyuan renewable resources Co., Ltd Address before: Industrial cluster area of Ruyang County, Luoyang City Patentee before: LUOYANG JINSHI RENEWABLE RESOURCES DEVELOPMENT Co.,Ltd. |