CN100593018C - Technological process method of producing aluminium oxide using high aluminium slag - Google Patents
Technological process method of producing aluminium oxide using high aluminium slag Download PDFInfo
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- CN100593018C CN100593018C CN200510200300A CN200510200300A CN100593018C CN 100593018 C CN100593018 C CN 100593018C CN 200510200300 A CN200510200300 A CN 200510200300A CN 200510200300 A CN200510200300 A CN 200510200300A CN 100593018 C CN100593018 C CN 100593018C
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- red mud
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Abstract
A process for preparing alumina from the high-Al slag generated by smelting iron with high-Fe bauxite includes such steps as ordinary-pressure dissolving out, red mud separating deposition, removing Si from overflow liquid, carbonating for decomposing to obtain aluminum hydroxide, and calcining.
Description
Technical field:
The present invention relates to process for making alumina, particularly relate to the technological process method of producing aluminum oxide with the slag after the high-iron bauxite ironmaking.
Background technology:
At present, the raw material of producing aluminum oxide in the world is a bauxite, and ore type is divided into three kinds of gibbsites, boehmite, diaspore, and production method mainly contains sintering process, Bayer process, integrated process etc.
The raw material of external alumina producer is mainly gibbsite, and alumina content is generally about 45% more than 35% in the ore, and the ore alumina silica ratio is more than 8.
The main raw material of China's alumina producer is a diaspore, and alumina content is usually 60～70% in the ore, and the ore alumina silica ratio is more than 5.
Because the annual bauxite amount of using of alumina producer is bigger, high grade ore reduces year by year, and China's bauxite resource problem of shortage is serious day by day, and so partial oxidation aluminium manufacturer brings into use Ore Imported, or consideration is gone abroad and done factory, does the ore deposit.
Under the insufficient situation of China's bauxite resource, how to utilize the low-grade bauxite resource, become the difficult problem that aluminum oxide industry faces.In provinces and regions such as Guangxi, Guizhou, a large amount of high-iron bauxite resources is arranged, be with as Nanning to the Yulin one in Guangxi, the reserves of high-iron gibbsite are very abundant, and according to the geological prospecting report, its ore reserves reaches billions of tons, if can develop, be a very big wealth.
The aluminum oxide grade is very low in the high-iron gibbsite of Guangxi, only is 23～28%, and ore alumina silica ratio only 2～3 is judged by prior art, and two indexs of aluminum oxide and alumina silica ratio do not satisfy the requirement of production aluminum oxide far away in the ore.Simultaneously, iron oxide content is 35%～42% in the ore, and the grade that is used to smelt iron is also on the low side.If this ore resource comprehensive utilization must will be adopted new technology and new technology.
The comprehensive utilization of high-iron bauxite is divided into two parts, and first part is used for blast furnace ironmaking with high-iron bauxite, obtains the pig iron and aluminous slag; Second section is that aluminous slag is used to refine aluminum oxide.And also be not suitable for adopting aluminous slag to produce the technological process method of aluminum oxide at present in the prior art.
The present invention is exactly at the resource situation of high-iron bauxite and chemical constitution, proposes to produce with the aluminous slag after the ironmaking novel process process approach of aluminum oxide.
Summary of the invention:
The objective of the invention is to: propose that a kind of technical process is simple, operation control easily, and the aluminous slag after the high-iron bauxite ironmaking can be used to produce the technological process method of producing aluminum oxide with aluminous slag of aluminum oxide, make the to be up to state standards requirement of metallurgical grade seconds of the alumina product that obtains, to overcome the deficiencies in the prior art, reach the purpose of the profuse low-grade mineral resource of comprehensive utilization China.
The present invention is achieved in that it will be sent to normal pressure stripping operation by the aluminous slag that obtains after the high-iron bauxite ironmaking and carry out the normal pressure stripping, slip in the stripping of normal pressure stripping operation is delivered to red mud separate and subside operation, the thick liquid that overflows by red mud separate and subside operation is after the desiliconization process desiliconization, enter the carbonating decomposition process and carry out the carbon divisional processing, the aluminium hydroxide that obtains after carbonating decomposition process carbon divides send calcining process to carry out calcination process and obtains qualified alumina product.
Handle the underflow that obtains by red mud separate and subside operation, handle the red mud that obtains through the washing and filtering operation and deliver to red mud dump or be used to produce material of construction, red mud wash liquor is then delivered to the circulating mother liquor storage tank; By the mother liquor that obtains behind the carbonating decomposition process carbon branch, after removing redundant moisture, evaporization process also delivers to the circulating mother liquor storage tank, and in this groove, add industrial ground caustic and allocate, the add-on of its industrial ground caustic is by 1 ton of Al of every production
2O
3Add 60～100kg industry ground caustic amount and control, the liquid after the allotment is delivered to normal pressure stripping operation and is used; Normal pressure stripping operation is to carry out in the normal pressure mechanical agitating tank, and its stripping temperature is 100～108 ℃, and containing the input and output material time is 4～7 hours at interior dissolution time, aluminous slag when cooling from efflorescence; The slip of red mud separate and subside operation stripping needs to reach repeatedly backflush through the subsider separation, and best washing times is 5～6 times; The mode that adopts carbonating to decompose decomposes out with the aluminum oxide in the solution, and carbon divides the CO that needs
2The flue gas supply that gas is produced by blast furnace.
The present invention is as follows with the technological process method and the characteristics of the master operation of aluminous slag production aluminum oxide:
(1) aluminous slag normal pressure stripping: the aluminous slag that obtains after the high-iron bauxite ironmaking, its main chemical compositions is Al
2O
3: 30～35%, CaO:45～50%, SiO
2: 13～16%.The main component of calcium aluminate slag is 12CaO.7Al
2O
3., CaO.Al
2O
3, 2CaO.SiO
2, the calcium aluminate slag of specific examples of such components is very easily leached by the sodium carbonate solution dissolving.Chemical equation is as follows:
12CaO.7Al
2O
3+12Na
2CO
3+3H
2O＝14NaAl(OH)
4+CaCO
3+10NaOH
Utilize the aluminous slag can be from the atomizing characteristics in when cooling, aluminous slag can directly carry out the normal pressure stripping without fragmentation and ore grinding, and the slip after the stripping send red mud separate and subside operation.
The circulating mother liquor of stripping aluminous slag, by the carbon evaporation mother liquor, red mud wash liquor and industrial ground caustic are formed.
This stripping is carried out in the normal pressure mechanical agitating tank, and 100～108 ℃ of stripping temperature are interrupted stripping 4～7 hours (containing the input and output material time) of dissolution time, and circulating mother liquor is a carbonic acid alkali, Na2O
cConcentration is 80～110g/l, and aluminous slag just can not need fragmentation and Grinding procedure from efflorescence when cooling.
The technology of normal pressure stripping is very simple, with existing high pressure stripping in essence difference is arranged relatively.Existing stripping is High Temperature High Pressure, high-alkali stripping, and its temperature is 260～280 ℃, and pressure 4.4～5.0Mpa, circulating mother liquor are caustic alkali, Na2O
KConcentration is 210～248g/l, for guaranteeing Al in the ore
2O
3Solubility rate, strict to the bauxite granularity requirements, fragmentation and Grinding procedure must be arranged.
(2) red mud separate and subside: the slip of stripping reaches repeatedly backflush through the subsider separation, and red mud send red mud dump after filtering or is used to produce material of construction.Desiliconization is sent in the separation tank overflow, and carried out the leaf filter by leaf filter, its seminal fluid siliceous modulus can reach more than 400.Red mud adopts 5～6 washings.Because alumina content is lower in the aluminous slag, red mud amount is bigger, and aluminum oxide output red mud per ton reaches 3.5～4.0 tons, and red mud wash water add-on is the 2t/t-red mud.
Alumina content height in the ore that existing alumina producer uses is generally 60～70%, and only 0.9～1.3 ton of aluminum oxide output red mud per ton so red mud wash water add-on is big, is generally 3.5～4.5t/t-red mud.Washing times is 3～4 times.The thick liquid of separation tank is not established independently desiliconization process.
(3), carbonating is decomposed: adopt the mode of carbonating decomposition, the aluminum oxide in the solution is decomposed out, send to washing.In order to guarantee the stripping of aluminous slag, need sodium carbonate solution, this operation adopts carbonating to decompose, and is convenient to form the production closed cycle.Carbon divides the CO that needs
2The flue gas supply that gas is produced by blast furnace, CO in the blast furnace flue gas
2Concentration is 20～25%, seminal fluid Al2O3 concentration 80～90g/l.
Existing aluminum oxide decomposition course and this decomposition have bigger difference, and bayer's process adopts kind of a branch, and sintering process adopts the carbon branch to add sintering kind branch, and carbon divides the CO that uses from limestone kiln
2Gas, seminal fluid alkali concn and CO in the production
2The concentration of gas is also higher.
(4), carbon mother liquid evaporation: for the water balance in the production system, an evaporization process is set, redundant moisture is excluded, produce qualified mother liquor simultaneously.Vaporizing raw liquor Na
2O
CConcentration 80～90g/l, mother liquid evaporation Na
2O
CConcentration 120～130g/l.
This operation adopts common process.
(5), Aluminium hydroxide roasting: the aluminium hydroxide that the carbon branch obtains, send calcining process, at high temperature remove attached water and crystal water, obtain the aluminum oxide qualified product.
The invention has the beneficial effects as follows: the profuse low-grade mineral resource of comprehensive utilization China, aluminous slag after the high-iron bauxite ironmaking is used to produce aluminum oxide, can the be up to state standards requirement of metallurgical grade seconds of the alumina product that obtains has very big economic benefit and social benefit.In addition, the present invention has also that technical process is simple, operation control is easy to advantage.
Description of drawings:
Fig. 1 produces the process flow sheet of aluminum oxide for aluminous slag of the present invention.
Embodiment:
Embodiment of the present invention: aluminous slag is delivered to the alumina producer material storage yard from iron work, and then carry out stripping with the stripping operation that handling equipment is sent to alumina producer, normal pressure stripping operation is adopted in its stripping, normal pressure stripping operation is carried out in the normal pressure mechanical agitating tank, its stripping temperature is controlled at 100～108 ℃, containing the input and output material time was controlled at 4～7 hours at interior dissolution time, and its aluminous slag can be from efflorescence when cooling; To deliver at the slip of normal pressure stripping operation stripping and carry out the processing of red mud separate and subside in the conventional red mud separate and subside operation, to send to desiliconization by the thick liquid of overflow that the red mud separate and subside is handled, filter, produce qualified sodium aluminate concentrate solution, for the siliceous modulus that guarantees desiliconization reaches more than 400, when desiliconization, can add part crystal seed and milk of lime routinely, to be sent to conventional carbonating decomposition process by the sodium aluminate concentrate solution that desiliconization process be handled the back gained then and carry out obtaining aluminium hydroxide after the carbon divisional processing, can obtain qualified alumina product after the aluminium hydroxide that obtains after carbon is divided send conventional calcining process to handle.When producing, handle the underflow that obtains by red mud separate and subside operation, handling the red mud that obtains through the washing and filtering operation delivers to red mud dump or is used to produce material of construction, its red mud wash liquor is then delivered in the circulating mother liquor storage tank, and by the mother liquor that obtains behind the carbonating decomposition process carbon branch, also deliver in the circulating mother liquor storage tank after evaporization process is removed redundant moisture, and adding appropriate amount of industrial ground caustic is allocated in this groove, the add-on of its industrial ground caustic is by 1 ton of Al of every production
2O
3Add 60～100kg industry ground caustic amount and control, the liquid after the allotment is delivered to normal pressure stripping operation as circulating mother liquor use, and then be used for the stripping of aluminous slag, form closed circuit circulatory system.The slip of red mud separate and subside operation stripping preferably separates reaching repeatedly backflush through subsider, its best washing times is controlled at 5～6 times; When the mode that adopts carbonating to decompose decomposed out with the aluminum oxide in the solution, its carbon divided required CO
2The flue gas supply that gas can utilize blast furnace of the prior art to produce.
Claims (3)
1. technological process method of producing aluminum oxide with aluminous slag, it is characterized in that: will be sent to normal pressure stripping operation by the aluminous slag that obtains after the high-iron bauxite ironmaking and carry out the normal pressure stripping, slip in the stripping of normal pressure stripping operation is delivered to red mud separate and subside operation, the thick liquid that overflows by red mud separate and subside operation is after the desiliconization process desiliconization, enter the carbonating decomposition process and carry out the carbon divisional processing, the aluminium hydroxide that obtains after carbonating decomposition process carbon divides send calcining process to carry out calcination process and obtains qualified alumina product; Handle the underflow that obtains by red mud separate and subside operation, handle the red mud that obtains through the washing and filtering operation and deliver to red mud dump or be used to produce material of construction, red mud wash liquor is then delivered to the circulating mother liquor storage tank; By the mother liquor that obtains behind the carbonating decomposition process carbon branch, after removing redundant moisture, evaporization process also delivers to the circulating mother liquor storage tank, and in this groove, add industrial ground caustic and allocate, the add-on of its industrial ground caustic is by 1 ton of Al of every production
2O
3Add 60～100kg industry ground caustic amount and control, the liquid after the allotment is delivered to normal pressure stripping operation and is used; Normal pressure stripping operation is to carry out in the normal pressure mechanical agitating tank, and its stripping temperature is 100～108 ℃, and containing the input and output material time is 4～7 hours at interior dissolution time, aluminous slag when cooling from efflorescence.
2. technological process method of producing aluminum oxide with aluminous slag according to claim 1 is characterized in that: the slip of red mud separate and subside operation stripping, need to reach repeatedly backflush through the subsider separation, and washing times is 5～6 times.
3. technological process method of producing aluminum oxide with aluminous slag according to claim 1 is characterized in that: the mode that adopts carbonating to decompose decomposes out with the aluminum oxide in the solution, and carbon divides the C0 that needs
2The flue gas supply that gas is produced by blast furnace.
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| CN100593018C true CN100593018C (en) | 2010-03-03 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101920978B (en) * | 2010-06-25 | 2012-12-12 | 山西铝厂科技化工公司 | Method for producing boehmite by using washing liquor |
| CN106241843A (en) * | 2016-07-19 | 2016-12-21 | 武汉理工大学 | A kind of method that aluminium hydroxide is prepared in polyaluminium waste slag of aluminum acid system recovery |
| CN109556414B (en) * | 2017-09-27 | 2020-06-12 | 沈阳铝镁设计研究院有限公司 | Method and device for utilizing waste heat of aluminum hydroxide roasting furnace product |
| CN111747432A (en) * | 2019-03-29 | 2020-10-09 | 沈阳铝镁设计研究院有限公司 | Method for improving decomposition yield of alumina plant |
| CN111874927A (en) * | 2020-06-22 | 2020-11-03 | 河南华慧有色工程设计有限公司 | Carbon method aluminum oxide energy-saving emission-reducing production method |
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Non-Patent Citations (2)
| Title |
|---|
| 广西贵县高铁三水铝石矿综合利用研究. 张敬东等.轻金属，第12期. 1990 |
| 广西贵县高铁三水铝石矿综合利用研究. 张敬东等.轻金属，第12期. 1990 * |
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