CN104762492A - Method for removing trace elements out of molten primary aluminium - Google Patents
Method for removing trace elements out of molten primary aluminium Download PDFInfo
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- CN104762492A CN104762492A CN201510172986.5A CN201510172986A CN104762492A CN 104762492 A CN104762492 A CN 104762492A CN 201510172986 A CN201510172986 A CN 201510172986A CN 104762492 A CN104762492 A CN 104762492A
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Abstract
The invention discloses a method for removing trace elements out of molten primary aluminium. According to the method, on the bases of the existing prior in which aluminium ingots or aluminium products are cast by using the molten primary aluminium and with regard to the requirement of aluminium deep-processing on the product quality, nitrogen gas, potassium chloride, aluminium fluoride and the like are timely and quantitatively charged in a smelting furnace to refine primary aluminium so that the trace elements in the molten primary aluminium are specifically removed with a clear target, thus meeting the need of downstream aluminium deep-processing on the quality of the primary aluminium; raw materials for producing the primary aluminium are not limited any more, thus providing an effective way for effectively reducing the production costs of enterprises, increasing the added values of the products, and creating higher economic benefits. The method disclosed by the invention is capable of obviously causing quality influence on production of downstream aluminium processed products, and has a profound significance for the future research of development the aluminium industry towards high-end aluminium products.
Description
technical field:
The present invention relates to a kind of removing method of trace element, particularly relate to a kind of removing method of primary aluminum aluminium liquid medium trace element, belong to aluminium intensive processing technical field.
background technology:
Aluminum i ndustry development is the sunrise industry of China, and metallic aluminium is all widely used in social every field.Along with the development of China's aluminum i ndustry, electrolytic aluminum production capacity is constantly expanded, current electrolytic aluminum production capacity is seriously superfluous, aluminium product price is caused significantly to glide, each aluminium electrolysis enterprise and processing enterprise face crisis of survival, each company is carrying out the measures such as reduction production cost, add that domestic raw material quality also significantly glides, higher-grade bauxitic ore is deficient, quality of alumina reduces, various trace element is entrained in aluminum oxide and enters with Aluminum Electrolysis Production in primary aluminum aluminium liquid, very large impact is brought to follow-up aluminium processing quality, derived product quality accident and quality objection is caused again and again to occur, larger financial loss is brought to enterprise.
Along with aluminum fabrication industry transition and upgrade, more high-end alloy product is developed in aluminium intensive processing field further, also stricter to the demand of primary aluminum aluminium liquid quality.But the ore grade of domestic current production aluminum oxide is more and more lower, and various trace element increases relatively, the primary aluminum medium trace element content of production also gets more and more.Larger quality influence is caused to downstream wrought aluminium products, in order to reduce production cost, ensure that aluminium quality product meets downstream customer demand, more in order to develop high-end product, increase added value of product, enterprise economic benefit, the trace element removed in primary aluminum aluminium liquid is extremely urgent.
Present Domestic has refined aluminium to process, and primary aluminum grade can be made to significantly improve, and also has the special import aluminum oxide that uses as production primary aluminum, to ensure intensive processing primary aluminum demand, but causes cost to increase severely like this.
summary of the invention:
Technical problem to be solved by this invention is: overcome the deficiencies in the prior art, a kind of removing method of primary aluminum aluminium liquid medium trace element is provided, trace element in primary aluminum aluminium liquid can be removed targetedly, promote aluminium quality product, reduce the effect of production run cost.The method production technique is simple, input cost is few, elimination effect is high, can meet the various product of downstream aluminium intensive processing to the demand of primary aluminum quality.
The technical scheme that the present invention takes for technical solution problem is:
A removing method for primary aluminum aluminium liquid medium trace element, its concrete steps are as follows:
A, on the basis that existing employing primary aluminum aluminium liquid produces aluminium ingot or aluminium product, in units of every smelting furnace, add primary aluminum carry out melting, after primary aluminum enters stove, in smelting furnace, pass into nitrogen in order, add the refining agent such as Repone K and aluminum fluoride;
In B, fusion process, smelting temperature controls within the scope of 730 ~ 800 DEG C;
C, often reduce by 10 ~ 18 DEG C according to primary aluminum temperature of aluminum liquid and once quantitatively pass into 10 ~ 40 m
3n
2mix pressurized gas, add the AlF of KCl and 1 ~ 2 ‰ of 1 ~ 2 ‰
3, stir, remove the gred, leave standstill, carry out refinery practice step;
D, divide four refinings by primary aluminum aluminium liquid, each refining time is 20 ~ 25 minutes;
All to carry out slag skimming process after E, each refining, the impurity swimming in aluminium liquid surface is cleared up;
F, skim at every turn after all to leave standstill, each time of repose is 20 ~ 30 minutes;
G, above-mentioned four road refining procedures start to carry out the casting technique of aluminium ingot or aluminium product after completing.
Described refining agent is KCl and AlF
3.
Positive beneficial effect of the present invention is:
1, the present invention is on the basis of traditional mode of production aluminium ingot or wrought aluminium products technique, for the requirement of aluminium intensive processing to quality product, remove the hazardous trace elements in primary aluminum aluminium liquid targetedly, meet the specification of quality of downstream aluminium Product processing, by passing into nitrogen, aluminum fluoride and refining agent in holding furnace, the refining that primary aluminum carries out trace element is removed, reach the demand of downstream fine deep processed product to primary aluminum aluminium liquid quality, for enterprise's production cost effectively reduce, improve added value of product, create higher economic benefit effective way is provided.
2, production technique of the present invention is simple, low in input cost, elimination effect are obvious, and the primary aluminum per ton cost produced relative to rafifinal production technique and import special aluminium oxide about reduces by 400 ~ 800 yuan, and economic benefit is very considerable.
3, the present invention can cause quality influence to the production of downstream wrought aluminium products, improves the qualification rate of finished product, has profound significance to aluminum i ndustry from now on to high-end aluminium product research.
Primary aluminum aluminium liquid medium trace element removes forward and backward content balance numerical value as following table through the present invention:
Known from above experimental data: the present invention can remove the hazardous trace elements primary aluminum aluminium liquid targetedly, meets the specification of quality of downstream aluminium Product processing, for enterprise's production cost effectively reduces, improves added value of product and provide effective technical support.
embodiment:
Below in conjunction with embodiment, the present invention is made further explanation and description:
Embodiment:
A removing method for primary aluminum aluminium liquid medium trace element, its concrete steps are as follows:
A, on the basis that existing employing primary aluminum aluminium liquid produces aluminium ingot or aluminium product, in units of every smelting furnace, add primary aluminum carry out melting, after primary aluminum enters stove, in smelting furnace, pass into nitrogen in order, add Repone K and aluminum fluoride etc. as refining agent;
In B, fusion process, smelting temperature controls within the scope of 730 ~ 800 DEG C;
C, often reduce by 10 ~ 18 DEG C according to primary aluminum temperature of aluminum liquid and once quantitatively pass into 10 ~ 40 m
3n
2mix pressurized gas, add the AlF of KCl and 1 ~ 2 ‰ of 1 ~ 2 ‰
3, stir, remove the gred, leave standstill, carry out refinery practice step;
D, divide four refinings by primary aluminum aluminium liquid, each refining time is 20 ~ 25 minutes;
All to carry out slag skimming process after E, each refining, the impurity swimming in aluminium liquid surface is cleared up;
F, skim at every turn after all to leave standstill, each time of repose is 20 ~ 30 minutes;
G, above-mentioned four road refining procedures start to carry out the casting technique of aluminium ingot or aluminium product after completing.
In step " A ", described refining agent is KCl and AlF
3.
In step " C ", KCl and AlF
3add-on be 1 ~ 2 ‰ of primary aluminum quality in smelting furnace.
In the invention, the technology part do not described in detail is known technology.
This invention is on the basis of traditional mode of production aluminium ingot or wrought aluminium products technique, for the requirement of aluminium intensive processing to quality product, remove the hazardous trace elements in primary aluminum aluminium liquid targetedly, meet the specification of quality of downstream aluminium Product processing, by passing into nitrogen, aluminum fluoride and refining agent in holding furnace, the refining that primary aluminum carries out trace element is removed, reach the demand of downstream fine deep processed product to primary aluminum aluminium liquid quality, there is the advantages such as production technique is simple, low in input cost, elimination effect are obvious.
Claims (2)
1. a removing method for primary aluminum aluminium liquid medium trace element, its concrete steps are as follows:
A, on the basis that existing employing primary aluminum aluminium liquid produces aluminium ingot or aluminium product, in units of every smelting furnace, add primary aluminum carry out melting, after primary aluminum enters stove, in smelting furnace, pass into nitrogen in order, add Repone K and aluminum fluoride as refining agent;
In B, fusion process, smelting temperature controls within the scope of 730 ~ 800 DEG C;
C, often reduce by 10 ~ 18 DEG C according to primary aluminum temperature of aluminum liquid and once quantitatively pass into 10 ~ 40 m
3n
2mix pressurized gas, add the AlF of KCl and 1 ~ 2 ‰ of 1 ~ 2 ‰
3, stir, remove the gred, leave standstill, carry out refinery practice step;
D, divide four refinings by primary aluminum aluminium liquid, each refining time is 20 ~ 25 minutes;
All to carry out slag skimming process after E, each refining, the impurity swimming in aluminium liquid surface is cleared up;
F, skim at every turn after all to leave standstill, each time of repose is 20 ~ 30 minutes;
G, above-mentioned four road refining procedures start to carry out the casting technique of aluminium ingot or aluminium product after completing.
2. the removing method of primary aluminum aluminium liquid medium trace element according to claim 1, is characterized in that: described refining agent is KCl and AlF
3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510172986.5A CN104762492A (en) | 2015-04-14 | 2015-04-14 | Method for removing trace elements out of molten primary aluminium |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510172986.5A CN104762492A (en) | 2015-04-14 | 2015-04-14 | Method for removing trace elements out of molten primary aluminium |
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| CN104762492A true CN104762492A (en) | 2015-07-08 |
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| CN201510172986.5A Pending CN104762492A (en) | 2015-04-14 | 2015-04-14 | Method for removing trace elements out of molten primary aluminium |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105803215A (en) * | 2016-04-07 | 2016-07-27 | 河南中孚技术中心有限公司 | Multiple-effect composite refining flux for removing impurities in aluminum and aluminum alloy melt and application |
| CN107326196A (en) * | 2017-06-09 | 2017-11-07 | 河南中孚实业股份有限公司 | The method for eliminating black oxide slag inclusion problem in pop can cover material ingot casting |
| CN107604181A (en) * | 2017-09-13 | 2018-01-19 | 青海高原有色金属研发有限公司 | A kind of production method of aluminium and aluminium alloy |
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| CN101063186A (en) * | 2006-05-09 | 2007-10-31 | 陈月丹 | Production technique of aluminum alloy damper cylinder |
| CN101115852A (en) * | 2005-04-07 | 2008-01-30 | 日本轻金属股份有限公司 | Sodium-free flux and process for treatment of molten aluminum alloy with the same |
| CN101487088A (en) * | 2009-01-16 | 2009-07-22 | 内蒙古吉泰铝业有限公司 | Mixture gas, and method and apparatus for purifying aluminum alloy melt using the same |
| CN101871052A (en) * | 2010-06-28 | 2010-10-27 | 江阴新仁科技有限公司 | Method for purifying aluminum and aluminum alloy melt |
| CN102719684A (en) * | 2012-07-06 | 2012-10-10 | 青铜峡铝业股份有限公司 | Method for improving internal crystallization of aluminum products |
| CN102719856A (en) * | 2012-07-02 | 2012-10-10 | 福建省南平铝业有限公司 | Method for removing alkali metal via electrolytic aluminum liquid |
| CN203683629U (en) * | 2014-01-14 | 2014-07-02 | 贵州中铝铝业有限公司 | Liquid refiner for three phase joint degassing and deslagging of aluminum melt |
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2015
- 2015-04-14 CN CN201510172986.5A patent/CN104762492A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101115852A (en) * | 2005-04-07 | 2008-01-30 | 日本轻金属股份有限公司 | Sodium-free flux and process for treatment of molten aluminum alloy with the same |
| CN101063186A (en) * | 2006-05-09 | 2007-10-31 | 陈月丹 | Production technique of aluminum alloy damper cylinder |
| CN101487088A (en) * | 2009-01-16 | 2009-07-22 | 内蒙古吉泰铝业有限公司 | Mixture gas, and method and apparatus for purifying aluminum alloy melt using the same |
| CN101871052A (en) * | 2010-06-28 | 2010-10-27 | 江阴新仁科技有限公司 | Method for purifying aluminum and aluminum alloy melt |
| CN102719856A (en) * | 2012-07-02 | 2012-10-10 | 福建省南平铝业有限公司 | Method for removing alkali metal via electrolytic aluminum liquid |
| CN102719684A (en) * | 2012-07-06 | 2012-10-10 | 青铜峡铝业股份有限公司 | Method for improving internal crystallization of aluminum products |
| CN203683629U (en) * | 2014-01-14 | 2014-07-02 | 贵州中铝铝业有限公司 | Liquid refiner for three phase joint degassing and deslagging of aluminum melt |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105803215A (en) * | 2016-04-07 | 2016-07-27 | 河南中孚技术中心有限公司 | Multiple-effect composite refining flux for removing impurities in aluminum and aluminum alloy melt and application |
| CN107326196A (en) * | 2017-06-09 | 2017-11-07 | 河南中孚实业股份有限公司 | The method for eliminating black oxide slag inclusion problem in pop can cover material ingot casting |
| CN107604181A (en) * | 2017-09-13 | 2018-01-19 | 青海高原有色金属研发有限公司 | A kind of production method of aluminium and aluminium alloy |
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