CN1424256A - Production of aluminum oxide from iron containing bauxite - Google Patents
Production of aluminum oxide from iron containing bauxite Download PDFInfo
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- CN1424256A CN1424256A CN 02154145 CN02154145A CN1424256A CN 1424256 A CN1424256 A CN 1424256A CN 02154145 CN02154145 CN 02154145 CN 02154145 A CN02154145 A CN 02154145A CN 1424256 A CN1424256 A CN 1424256A
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- calcium aluminate
- calcium
- iron
- aluminate slag
- furnace
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Abstract
A process for preparing Al2O3 from the Fe-contained bauxite includes such steps as preparing pig and molten calcium aluminate slag which contains Al2O3 in the form of 12 CaO.7Al2O3, extracting, filtering, washing, removing silicon, carbonating decomposing, filtering, evaporating, washing and calcining to obtain Al2O3.
Description
Technical field:
The present invention relates to a kind of processing method of producing aluminum oxide, especially a kind of iron content bauxite into alumina technology.
Background technology:
Alumina producing factory, adopt bayer's process or sintering process and Baeyer substantially---the sintering integrated process is produced aluminum oxide, the aluminum oxide in the ore is leached produce aluminum oxide earlier, and iron leaches the liquid-solid separation circuit in back at aluminum oxide and enters in the slag (red mud); And then the iron in the slag handled the production technique of " iron behind the first aluminium " just.When iron-holder is high in the bauxitic ore that this technology shortcoming is to handle, can makes and produce the increase of alumina process energy consumption, the inventory of processing is big, and production cost is too high, and the high red mud of iron-holder is difficult to handle the iron efficient recovery with wherein.
Summary of the invention:
The purpose of this invention is to provide and a kind ofly adopt sinter machine, rotary kiln, tunnel furnace, blast furnace, electric furnace at first the iron in the iron content bauxite to be smelted from ore to extract, again the calcium aluminate slag that obtains is carried out controlled chilling, and leaching, filtration, desiliconization, carbonating decomposition, filtering separation, evaporation, washing and calcining obtain the processing method of aluminum oxide.
The technical solution used in the present invention is the method for " aluminium behind the first iron ", earlier iron is extracted from ore, and then produces aluminum oxide, makes iron and aluminium energy efficient recovery in the ore.
The present invention can obtain the pig iron and calcium aluminate slag melt by one of four kinds of modes.A kind of is that ore directly enters blast-furnace smelting and obtains the pig iron and calcium aluminate slag melt; A kind of is sintering---blast-furnace smelting obtains the pig iron and calcium aluminate slag melt; A kind of is tunnel furnace prereduction---blast furnace or electric furnace obtain the pig iron and calcium aluminate slag melt molten the branch; A kind of is rotary kiln prereduction---blast furnace or electric furnace obtain the pig iron and calcium aluminate slag melt molten the branch.The calcium aluminate slag melt of gained is carried out controlled chilling condense, obtain Al
2O
3Mainly with 12CaO7Al
2O
3The calcium aluminate slag that form exists leaches this slag, filtration, filtration washing, desiliconization, carbonating decomposition, filtering separation, evaporation, washing, calcining obtain aluminum oxide then.
In steelmaking furnace or molten the branch in the electric furnace, when iron was reduced, silicon oxide in the ore and calcium oxide reaction generated calcium orthosilicate 2CaOSiO
2, calcium orthosilicate takes place from β-2CaOSiO in process of cooling
2To T-2CaOSiO
2Crystal conversion, and calcium orthosilicate volumetric expansion makes calcium aluminate slag from efflorescence.Aluminum oxide in the ore and calcium oxide generate the calcium aluminum compound, mainly generate 12CaO7Al
2O
3, also may generate 3CaOAl
2O
3, CaOAl
2O
3And CaO-Al
2O
3-SiO
2Ternary compound.In the controlled chilling operation, ternary compound can decompose and becomes 12CaO7Al at last
2O
3Behind iron and the calcium aluminate slag melt extraction, the calcium aluminate slag melt is controlled slow cooling, and speed of cooling is 4～7 ℃/minute, and the temperature range of controlled chilling is that calcium aluminate slag condenses and begins to the slag end of condensing.
Adopt this art breading bauxite into alumina and the pig iron, can make and smelt many a kind of production technique in the aluminium production, thereby can effectively produce aluminum oxide and reclaim other valuable metals the dissimilar aluminum ores of different grades.
Description of drawings:
Elaborate below in conjunction with accompanying drawing:
Fig. 1 is a blast-furnace smelting---leach the aluminium oxide extraction process flow process.
Fig. 2 is a sintering---blast-furnace smelting---leaches the aluminium oxide extraction process flow process.
Fig. 3 is tunnel furnace prereduction, and---blast furnace (electric furnace) is molten to be divided---leaches the aluminium oxide extraction process flow process.
Fig. 4 is rotary kiln prereduction, and---blast furnace (electric furnace) is molten to be divided---leaches the aluminium oxide extraction process flow process.
Embodiment:
The present invention extracts iron earlier from ore, the mode that can adopt sintering, prereduction to melt branch then or smelt, and the mode of directly ore directly being smelted obtains the pig iron and calcium aluminate slag.In this stage, ore, Wingdale, coal are entered blast-furnace smelting, obtain the pig iron and calcium aluminate slag melt and flue gas (Fig. 1); Ore, Wingdale, lime and coal carried out with sinter machine sintering obtains allocating coke into behind the agglomerate and hot blast enters blast-furnace smelting, thereby obtain the pig iron, blast furnace gas and calcium aluminate slag melt (Fig. 2); Ore, Wingdale, coal are carried out prereduction with ferrous metalization with tunnel furnace, enter blast furnace or electric furnace then iron and aluminium are melted branch, obtain the pig iron and calcium aluminate slag melt (Fig. 3); Ore, Wingdale, coal are carried out prereduction with rotary kiln,, enter blast furnace or electric furnace then iron and aluminium are melted branch, obtain the pig iron and calcium aluminate slag melt (Fig. 4) ferrous metalization.
The fused calcium aluminate slag melt that these several modes obtain is formed a complete process for making alumina by controlled chilling operation, leaching operation, desiliconization process, filtering separation operation, filtration washing technology, washing procedure, calcination process, evaporization process.
The method of this process using " aluminium behind the first iron " is produced aluminum oxide, ore, lime and coal carried out sintering or prereduction according to a certain ratio or mode such as directly smelt, iron is separated in smelting procedure with aluminium, when the iron in the ore is reduced, aluminum oxide in the ore and calcium oxide reaction generate the calcium aluminate slag melt, this melt slag carries out controlled chilling and condenses when coming out of the stove, make the Al in the ore
2O
3With 12CaO7Al
2O
3Form exist, the SiO in the ore is with 2CaOSiO
2Form exist, the phase composite of slag thing mainly is 12CaO7Al
2O
3And 2CaOSiO
2Then this slag is leached, this is the principal feature of this technology.
After the calcium aluminate slag melt is come out of the stove, in annealer, control slow cooling, the speed of cooling of slag is condensed within the required range, thereby finally generate mainly with 12CaO7Al
2O
3And 2CaOSiO
2The calcium aluminate slag of forming.Calcium aluminate slag and alkali (caustic soda or soda ash) leach in leaching operation, aluminium is leached the generation sodium aluminate solution from calcium aluminate slag, sodium aluminate leach liquor after the filtration is reduced to siliceous modulus more than 400 with silicone content in the solution in desiliconization process, seminal fluid after the desiliconization utilizes carbon dioxide that sodium aluminate solution is decomposed in the carbonating decomposition process and generates aluminium hydroxide, pass through filtering separation, obtain aluminum hydroxide crystals and mother liquor, mother liquor (can extract the recovery gallium, after obtaining gallium) evaporate, obtain circulating mother liquor and return the leaching operation participating in leaching, the aluminum hydroxide crystals hot wash, aluminum hydroxide wash liquor returns the leaching operation, calcium aluminate slag is leached, and aluminium hydroxide is calcined, and obtains the product aluminum oxide.
Embodiment:
Calcium aluminate slag is discharged by slag notch, and the slag after the eliminating enters the insulation jar and slowly cools off, and slowly the slow cool down temperature is by about 1500 ℃ to 1250 ℃.Afterwards calcium aluminate slag is delivered to the stripping groove and carried out two sections strippings (stirring the stripping groove, 75 ℃ of stripping temperature, dissolution time 150 minutes), the stripping slurries separate with subsider.The subsider overflow enters desiliconization slot (150 ℃ of humidity, crystal seed amount 70g/1,2 hours time, siliceous modulus A/S＞400) and carries out atmospheric silicon removing.Settlement separate (red-mud settlement separator tank) underflow is delivered to subsider (red-mud settlement rinse bath) and is carried out repeatedly backflush.The red mud of last washing settling groove enters last drum filter washing and filter pressing, and filtrate is returned dilution trap, filters red mud and send red mud dump.The new water of last laterite washing.
Slurries after the desiliconization send grading machine to handle, and classification underflow returns desiliconization slot as the desiliconization seed.Redundance send the laterite washing system or washs the back after filtration as byproduct.Leaf filter is advanced in the classification overflow, and filtrate is purified sodium aluminate solution (abbreviation seminal fluid), sends to decomposition.Underflow send the laterite washing system.
Seminal fluid stirs (carbon divides decomposer, 80 ℃ of decomposition temperatures, 6 hours time, terminal point ak3.1) and separates out aluminium hydroxide under the adding carbon dioxide conditions.Divide the aluminium hydroxide that parses to reach washing after filtration and promptly get the aluminium hydroxide product, get alumina product through calcining (calcination rotary kiln, 1200 ℃ of temperature, 70 minutes time).
Washings enters vapo(u)rization system (vaporizer) and evaporates, and evaporated liquor behind the dehydration by evaporation and aluminium hydroxide filtered liquid and aluminum hydroxide wash liquor return stripping operation batching and use.
Claims (3)
1, a kind of iron content bauxite into alumina technology is characterized in that: adopt the method for aluminium behind the first iron, can obtain the pig iron and calcium aluminate slag melt by one of four kinds of modes, a kind of is that ore directly enters blast-furnace smelting and obtains the pig iron and calcium aluminate slag melt; A kind of is sintering---blast-furnace smelting obtains the pig iron and calcium aluminate slag melt, a kind of is tunnel furnace prereduction---and blast furnace or electric furnace obtain the pig iron and calcium aluminate slag melt molten the branch, and a kind of is rotary kiln prereduction---and blast furnace or electric furnace obtain the pig iron and calcium aluminate slag melt molten the branch; The calcium aluminate slag melt of gained is carried out controlled chilling condense, obtain Al
2O
3Mainly with 12CaO7Al
2O
3The calcium aluminate slag that form exists leaches this slag, filtration, filtration washing, desiliconization, carbonating decomposition, filtering separation, evaporation, washing, calcining obtain aluminum oxide then.
2, iron content bauxite into alumina technology according to claim 1 is characterized in that: in steelmaking furnace or molten the branch in the electric furnace, when iron was reduced, silicon oxide in the ore and calcium oxide reaction generated calcium orthosilicate 2CaOSiO
2, calcium orthosilicate takes place from β-2CaOSiO in process of cooling
2, to T-2CaOSiO
2Crystal conversion, and calcium orthosilicate volumetric expansion makes calcium aluminate slag from efflorescence; Aluminum oxide in the ore and calcium oxide generate the calcium aluminum compound, mainly generate 12CaO7Al
2O
3, also may generate 3CaOAl
2O
3, CaOAl
2O
3And CaO-Al
2O
3-SiO
2Ternary compound; In the controlled chilling operation, ternary compound can decompose and becomes 12CaO7Al at last
2O
3
3, iron content bauxite into alumina technology according to claim 1, it is characterized in that: behind iron and the calcium aluminate slag melt extraction, the calcium aluminate slag melt is controlled slow cooling, speed of cooling is 4～7 ℃/minute, and the temperature range of controlled chilling is that calcium aluminate slag condenses and begins to the slag end of condensing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02154145 CN1424256A (en) | 2002-12-23 | 2002-12-23 | Production of aluminum oxide from iron containing bauxite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02154145 CN1424256A (en) | 2002-12-23 | 2002-12-23 | Production of aluminum oxide from iron containing bauxite |
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| Publication Number | Publication Date |
|---|---|
| CN1424256A true CN1424256A (en) | 2003-06-18 |
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ID=4752441
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|---|---|---|---|
| CN 02154145 Pending CN1424256A (en) | 2002-12-23 | 2002-12-23 | Production of aluminum oxide from iron containing bauxite |
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|---|---|
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007009377A1 (en) * | 2005-07-18 | 2007-01-25 | China Aluminum International Engineering Corporation Limited | A process for preparing powdery alumina from low concentration solution by seed decomposition |
| CN102168156A (en) * | 2011-03-29 | 2011-08-31 | 东北大学 | Iron and aluminum melting separation method for complicated and hard-dressing aluminum and iron intergrowth ore |
| WO2011127671A1 (en) * | 2010-04-12 | 2011-10-20 | 东北大学 | Method for extracting aluminium hydroxide and alumina from byproduct obtained during refining metal magnesium with aluminium or aluminium alloy as reducer |
| CN102515219A (en) * | 2011-11-05 | 2012-06-27 | 胡长春 | Slag-free production process for extracting aluminum oxide and reduced iron by using bauxite one-step method |
| CN102605185A (en) * | 2012-03-16 | 2012-07-25 | 东北大学 | Comprehensive iron-aluminium paragenetic mineral utilization method |
| CN103014214A (en) * | 2013-01-11 | 2013-04-03 | 钢铁研究总院 | Method for realizing combined extraction of iron and aluminum oxide in iron-aluminum complex ore |
| WO2022156076A1 (en) * | 2021-01-21 | 2022-07-28 | 东北大学 | Method for producing aluminum oxide using slag metallurgy technology |
-
2002
- 2002-12-23 CN CN 02154145 patent/CN1424256A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007009377A1 (en) * | 2005-07-18 | 2007-01-25 | China Aluminum International Engineering Corporation Limited | A process for preparing powdery alumina from low concentration solution by seed decomposition |
| WO2011127671A1 (en) * | 2010-04-12 | 2011-10-20 | 东北大学 | Method for extracting aluminium hydroxide and alumina from byproduct obtained during refining metal magnesium with aluminium or aluminium alloy as reducer |
| CN102168156A (en) * | 2011-03-29 | 2011-08-31 | 东北大学 | Iron and aluminum melting separation method for complicated and hard-dressing aluminum and iron intergrowth ore |
| CN102168156B (en) * | 2011-03-29 | 2013-05-08 | 东北大学 | Iron and aluminum melting separation method for complicated and hard-dressing aluminum and iron intergrowth ore |
| CN102515219A (en) * | 2011-11-05 | 2012-06-27 | 胡长春 | Slag-free production process for extracting aluminum oxide and reduced iron by using bauxite one-step method |
| CN102605185A (en) * | 2012-03-16 | 2012-07-25 | 东北大学 | Comprehensive iron-aluminium paragenetic mineral utilization method |
| CN103014214A (en) * | 2013-01-11 | 2013-04-03 | 钢铁研究总院 | Method for realizing combined extraction of iron and aluminum oxide in iron-aluminum complex ore |
| WO2022156076A1 (en) * | 2021-01-21 | 2022-07-28 | 东北大学 | Method for producing aluminum oxide using slag metallurgy technology |
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