CN100542961C - A kind of technology of processing bauxite to produce hydroted alumina with sodium hydroxide molten salt growth method - Google Patents
A kind of technology of processing bauxite to produce hydroted alumina with sodium hydroxide molten salt growth method Download PDFInfo
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Abstract
The present invention relates to a kind of technology of processing bauxite to produce hydroted alumina with sodium hydroxide molten salt growth method, comprising: with sodium hydroxide solution and bauxite heating the carrying out fused salt stripping reaction that mixes; The stripping grog leaches, and separating red mud obtains sodium aluminate solution, and sodium aluminate solution carries out deep desilication; The decomposition of sodium aluminate solution seed obtains aluminum hydroxide crystals and seed precipitation solution; Seed precipitation solution evaporates, crystallization, and crystalline mother solution turns back to fused salt stripping step, turns back to after the sodium aluminate crystallization is dissolved in water to plant step by step.The invention has the advantages that: the stripping temperature can significantly cut down the consumption of energy for than low 500～800 ℃ of conventional sintering method; Operate under normal pressure, flow process is simple, and is easy to operate; Low-grade diasporite bauxite in handling meets the reality needs that China's aluminum oxide develops; The digesting efficiency of alumina height; Do not add any auxiliary material, red mud amount is few, thereby sodium decreases and the aluminium damage is little, and is easy to reclaim valuable metal wherein; Good product quality.
Description
Technical field
The invention belongs to the process field of bauxite, specifically relate to a kind of technology of processing bauxite to produce hydroted alumina with sodium hydroxide molten salt growth method.
Background technology
As the main raw material of electrolytic aluminum, aluminum oxide industry occupies important status in Chinese national economy.China's bauxite is diaspore type bauxite more than 98%.The method that China handles bauxite at present mainly contains Bayer process and sintering process.
The technical process of Bayer process is: bauxite after fragmentation, with lime and the mother liquor after plant dividing evaporation grind into raw pulp, stripping under 240～280 ℃ and 3.7～6.5MPa pressure.The stripping slurries dilute with the red mud wash water, in subsider sodium aluminate solution are separated with red mud again, and red mud is discharged into red mud dump after washing.Sodium aluminate solution after the purification adds aluminium hydroxide crystal seed and decomposes, and separates out aluminium hydroxide, obtains aluminium hydroxide after the washing after filtration, and then calcining, promptly obtains alumina product.In this method, mother liquor and washing lotion need the evaporation concentration circulation.The Na that some amount is arranged during evaporation
2CO
3H
2O separates out from mother liquor, it is separated the back become NaOH solution and mother liquid evaporation together to be sent to the wet-milling batching with the lime slurry causticization.Bayer process is applicable to that mainly alumina silica ratio in the bauxite greater than 8 high-quality bauxite, makes the application of this method be subjected to the restriction of raw material sources.
The technical process of sintering process is: with bauxite and soda, lime high temperature (more than 1000 ℃) sintering, the Al in the ore
2O
3With Na
2CO
3Reaction generates sodium aluminate, and SiO
2Generate Dicalcium Phosphate (Feed Grade) (2CaOSiO with the Wingdale reaction
2), then sintered product is used the alkali lye stripping, the solution after the separation carries out the carbonating decomposition and obtains Al (OH) after deep desilication is refining
3Carbon mother liquid returns the preparation charge pulp after evaporation.This method can be used for alumina silica ratio at the low-grade bauxite more than 3, and it uses the restriction that is not subjected to raw material sources, but the temperature of reaction height of this method, greater than 1000 ℃, complex process, energy consumption height, cost height, and unstable product quality.
A kind of " the atmospheric low-temperature stripping production method of aluminum oxide " disclosed in Chinese patent CN 03148717.3, this method is to adopt the inferior fused salt of sodium hydroxide to carry out the low-temperature atmosphere-pressure stripping of diaspore type bauxite, liquid-solid then separation, to carry out the sodium aluminate crystallization after the crude liquor of sodium aluminate desiliconization that obtain, the preliminary separation that realizes aluminium sodium, carry out kind of a branch operation after the sodium aluminate crystallization dissolving and obtain aluminium hydroxide, aluminium hydroxide obtains alumina product through calcining.The more conventional Bayer process of stripping temperature and pressure of this method significantly reduces, and bauxite stripping temperature can be reduced to less than 180 ℃, and stripping pressure is reduced to less than 0.2MPa, but the alkali concn that this method adopts is higher, liquid-solid separation is difficulty comparatively, and the flow process relative complex, unfavorable operation.
A kind of " technological process of preparing aluminium hydroxide from sodium hydroxide fused bauxite " disclosed in Chinese patent CN 00112940.6, this method is that bauxite is joined in the sodium hydroxide fused salt in proportion, make that the reaction of aluminum oxide and sodium hydroxide obtains the solid piece of sodium aluminate in the bauxite, after adding the water boil leaching, sodium aluminate solution carries out carbonic acid gas carbonization decomposition and obtains aluminium hydroxide and sodium carbonate solution.Sodium carbonate solution adds lime causticization again and reclaims sodium hydroxide.The similar yellow soda ash sintering process of this method, unstable product quality, and bauxite directly mixes the inhomogeneous solubility rate that influences aluminum oxide with the sodium hydroxide fused salt, and lime causticization causes the sodium hydroxide loss easily.
Summary of the invention
The objective of the invention is to overcome prior art when handling bauxite to produce hydroted alumina or aluminum oxide, or the raw material that uses is restricted, or the temperature of reaction height causes the energy consumption height, complex process, the cost height, and unstable product quality, or the alkali concn that adopts is higher, make liquid-solid separation comparatively difficult, the flow process relative complex, unfavorable operation, or because bauxite directly mixes the solubility rate that inhomogeneous meeting causes influencing aluminum oxide with the sodium hydroxide fused salt, and lime causticization causes defectives such as sodium hydroxide loss easily, thereby provide a kind of technology simple, aluminum oxide utilization ratio height need not high-temperature high-pressure apparatus, less investment, the technology of the processing bauxite to produce hydroted alumina with sodium hydroxide molten salt growth method of easy handling.
The objective of the invention is to realize by the following technical solutions:
The technology of processing bauxite to produce hydroted alumina with sodium hydroxide molten salt growth method provided by the invention as shown in Figure 1, comprising: (A) with the sodium hydroxide solution and bauxite heating the carrying out fused salt stripping reaction that mix; (B) the stripping grog leaches, and separating red mud obtains sodium aluminate solution, and sodium aluminate solution carries out deep desilication; (C) decomposition of sodium aluminate solution seed obtains aluminum hydroxide crystals and seed precipitation solution; (D) seed precipitation solution evaporate, crystallization, crystalline mother solution turns back to fused salt stripping step, turns back to after the sodium aluminate crystallization is dissolved in water kind step by step; Concrete steps comprise:
(A) fused salt stripping:
(preferred 1.5～1.8:1) stir according to the mol ratio 1.4～2.0:1 of sodium oxide and aluminum oxide with 30～80wt% aqueous sodium hydroxide solution and 60～300 purpose bauxite ore particles, mix, mixed solution is heated to 320～600 ℃ (preferred 350～500 ℃), reaction 5min～2h, aluminum oxide and sodium hydroxide in the bauxite are fully reacted, obtain containing the stripping grog of sodium aluminate;
Sodium hydroxide in the described aqueous sodium hydroxide solution can be the sodium hydroxide of analytical pure sodium hydroxide, technical grade, or contains the compounding substances of sodium hydroxide, or the crystalline mother solution that returns from step (D);
The preferred diaspore type bauxite of described bauxite also can be other salic raw material;
(B) sodium aluminate leaches:
The stripping grog that contains sodium aluminate that step (A) is obtained is cooled to about 100 ℃, and with leaching liquid leaching, impurity such as iron, titanium and most of silicon are stayed and formed red mud in the solid phase, remove by filter red mud after, obtain clarifying sodium aluminate solution; This filtrate is carried out deep desilication, obtain the sodium aluminate solution of desiliconization, discard after the red mud filter cake washing;
Described leaching liquid is a water; The amount that adds leaching liquid is advisable between 100～150g/L with sodium oxide concentration in the sodium aluminate solution after leaching;
Described deep desilication be with filtrate 150～170 ℃ of desiliconizations 2～4 hours, adopt Bayer red mud, or sodium white residue, kaolinite, bauxite, coal dust, activated carbon powder, iron powder, quartz sand etc. are as crystal seed; Or add down above-mentioned crystal seed desiliconizations 2～4 hours, and then under this temperature, add the desiliconization 0.5～4 hour again of 5～10g/L calcium oxide or calcium aluminate at 90～120 ℃;
The red mud filter cake washing water can turn back to the leaching of step (B), as the leaching liquid of the stripping grog that contains sodium aluminate;
(C) sodium aluminate solution kind branch:
The sodium aluminate solution of the desiliconization that step (B) is obtained adds aluminium hydroxide crystal seed, carries out seed and decompose under the condition of conventional Bayer process, obtains aluminium hydroxide coarse-grain and seed precipitation solution, and the aluminium hydroxide coarse-grain obtains the aluminium hydroxide product after washing, drying;
The condition of described conventional Bayer process is specially decomposes 60～75 ℃ of initial temperature, decomposes warm 40～50 ℃ eventually, and the resolving time is 40～70 hours, and seed load is 50～250g/L;
(D) seed precipitation solution evaporation and crystallization
The seed precipitation solution that step (C) is obtained carries out evaporative crystallization, after the sodium oxide concentration that heating evaporation contains to it is 500～700g/L, carry out crystallization at 45～120 ℃ of following constant temperature 0.5～6h, add sodium aluminate crystal seed (seed load is advisable with 5～20wt% of system sodium aluminate total amount) simultaneously, obtain sodium aluminate crystal and crystalline mother solution; Filter to isolate the sodium aluminate crystal, crystalline mother solution turns back to step (A) and is used for stripping bauxite;
The sodium aluminate crystal that obtains or sell with product form, or be dissolved in water into and turn back to step (C) behind the sodium aluminate solution and carry out seed and decompose.
The technology of processing bauxite to produce hydroted alumina with sodium hydroxide molten salt growth method provided by the invention is a kind of processing bauxite to produce hydroted alumina with sodium hydroxide molten salt growth method novel process.It is in step (A) fused salt treating processes, main purpose is the sodium aluminate that the diaspore in the bauxite is converted into solubility, in step (B) sodium aluminate in the stripping grog is separated with solution form and red mud then, and carry out deep desilication, the gained sodium aluminate solution can decompose by seed produces aluminium hydroxide, also can be used as other aluminum compound of preparation, as the hexafluoro sodium aluminate etc.; Can obtain clarifying sodium aluminate solution through above (A), (B) two operation stepss.
Compared with prior art, the advantage of the technology of processing bauxite to produce hydroted alumina with sodium hydroxide molten salt growth method provided by the invention is:
(1) stripping temperature of the present invention is 320～600 ℃, than conventional sintering method low 500～800 ℃ (conventional sintering method temperature about 1100 ℃), can significantly cut down the consumption of energy;
(2) the present invention operates under normal pressure, and flow process is simple, and is easy to operate;
(3) low-grade diasporite bauxite during the present invention can handle meets the reality needs that China's aluminum oxide develops;
(4) digesting efficiency of alumina height, when handling diaspore type bauxite, the solubility rate of aluminum oxide is up to 96%;
(5) the present invention does not add any auxiliary material, and red mud amount is few, thereby sodium decreases and the aluminium damage is little, and is easy to reclaim valuable metal wherein;
(6) the present invention adopts the seed decomposition to obtain aluminium hydroxide and obtains aluminum oxide then, thereby good product quality;
(7) compare with disclosed method among the Chinese patent CN 03148717.3, bauxite stripping reaction provided by the invention, its temperature of reaction is 320～600 ℃, on the fusing point of sodium hydroxide, and the alkali ore deposit of using is than low (the bauxite alumina content 66.8% of Shi Yonging in the present invention, alkali ore deposit ratio has only 0.7～1.0:1 (mass ratio), be lower than 1～2:1) in the disclosed method among the Chinese patent CN 03148717.3, be easy to subsequent operations, especially (disclosed method is because alkali ore deposit ratio is high among the Chinese patent CN 03148717.3 to have saved the crystallisation step of planting before dividing, must just can carry out kind of a branch after the crystallization of process sodium aluminate after the bauxite stripping), make technical process of the present invention simplify greatly, be convenient to use.
Description of drawings
Fig. 1 is the process flow sheet of processing bauxite to produce hydroted alumina with sodium hydroxide molten salt growth method of the present invention.
Embodiment
Embodiment 1
In alkaline-resisting reactor, 40g 40wt% aqueous sodium hydroxide solution (adding the water preparation by 16 gram analytical pure sodium hydroxide) and 20g are milled to 100 purpose Guizhou bauxite (alumina content is 66.8% in the bauxite) mix (the mol ratio 1.5:1 of sodium oxide and aluminum oxide in the mixture), in reactor, mixed solution is heated to 350 ℃, under this temperature, react 1h, aluminum oxide and sodium hydroxide in the bauxite are fully reacted, obtain containing the stripping grog of sodium aluminate.This stripping grog that contains sodium aluminate is cooled to about 100 ℃, add 90 ℃ hot water and make to leach in the sodium aluminate solution of back sodium oxide concentration at 120g/L, behind the leaching 30min, impurity such as iron, titanium and most of silicon are stayed and are formed red mud in the solid phase, after removing by filter red mud, obtain clarifying sodium aluminate solution; By the analysis revealed to red mud and mother liquor sodium aluminate, the solubility rate of aluminum oxide reaches 96.6%.
Above-mentioned filtrate (sodium aluminate solution) is added the kaolinite powder, carried out desiliconization 3 hours, obtain the sodium aluminate solution of desiliconization, discard after the red mud filter cake washing at 160 ℃.
The sodium aluminate solution of desiliconization is added aluminium hydroxide crystal seed, according to conventional Bayer process, decomposing 60 ℃ of initial temperature, decompose warm 50 ℃ eventually, 60 hours resolving times, seed load is to carry out seed under the 100g/L to decompose, and obtains the aluminium hydroxide coarse-grain and the seed precipitation solution of white, the aluminium hydroxide coarse-grain obtains aluminium hydroxide product 10.8g after washing, drying.
Seed precipitation solution heating evaporation to sodium oxide concentration is 540g/L, at 110 ℃ of following thermostatical crystallization 6h, adds sodium aluminate crystal seed (seed load is with the 10wt% of system sodium aluminate total amount) simultaneously, obtains sodium aluminate crystal and crystalline mother solution; Filter to isolate the sodium aluminate crystal, crystalline mother solution turns back to fused salt stripping step and carries out the stripping of bauxite.
Embodiment 2
In the nickel stirring tank, (crystalline mother solution concentration is sodium oxide 578.6g/L with sodium aluminate crystalline mother solution 70ml, aluminum oxide 24.1g/L) and after 50g is milled to 100 purpose Guizhou bauxite (alumina content is 66.8% in the bauxite) and mixes (the mol ratio 2.0:1 of sodium oxide and aluminum oxide in the mixture), in reactor, mixed solution is heated to 320 ℃, under this temperature, react 2h, aluminum oxide and sodium hydroxide in the bauxite are fully reacted, obtain containing the stripping grog of sodium aluminate.This stripping grog that contains sodium aluminate is cooled to about 100 ℃, add 80 ℃ hot water and make to leach in the sodium aluminate solution of back sodium oxide concentration at 120g/L, behind the leaching 30min, impurity such as iron, titanium and most of silicon are stayed and are formed red mud in the solid phase, after removing by filter red mud, obtain clarifying sodium aluminate solution; By the analysis revealed to red mud and mother liquor sodium aluminate, the solubility rate of aluminum oxide reaches 96.0%.
Above-mentioned filtrate (sodium aluminate solution) is added Bayer red mud, carried out desiliconization 4 hours at 100 ℃, the sodium aluminate solution of a desiliconization that will obtain after the filtration adds calcium aluminate (add-on 10g/L) again, desiliconization 2h again under this temperature, obtain the sodium aluminate solution of secondary desiliconization, discard after the red mud filter cake washing.
The sodium aluminate solution of desiliconization is added aluminium hydroxide crystal seed, according to conventional Bayer process, decomposing 75 ℃ of initial temperature, decompose warm 45 ℃ eventually, 72 hours resolving times, seed load is to carry out seed under the 200g/L to decompose, and obtains the aluminium hydroxide coarse-grain and the seed precipitation solution of white, the aluminium hydroxide coarse-grain obtains aluminium hydroxide product 29.7g after washing, drying.
Seed precipitation solution heating evaporation to sodium oxide concentration is 700g/L, at 45 ℃ of following thermostatical crystallization 0.5h, adds sodium aluminate crystal seed (seed load is with the 10wt% of system sodium aluminate total amount) simultaneously, obtains sodium aluminate crystal and crystalline mother solution; Filter to isolate the sodium aluminate crystal, crystalline mother solution turns back to fused salt stripping step and carries out the stripping of bauxite.
Embodiment 3
In alkaline-resisting reactor, 122g 30wt% aqueous sodium hydroxide solution (adding the water preparation by 36.5 gram analytical pure sodium hydroxide) and 50g are milled to 100 purpose Guizhou bauxite (alumina content is 66.8% in the bauxite) mix (the mol ratio 1.4:1 of sodium oxide and aluminum oxide in the mixture).In reactor, mixed solution is heated to 600 ℃, under this temperature, reacts 5min, aluminum oxide and sodium hydroxide in the bauxite are fully reacted, obtain containing the stripping grog of sodium aluminate.This stripping grog that contains sodium aluminate is cooled to about 100 ℃, add 95 ℃ hot water and make to leach in the sodium aluminate solution of back sodium oxide concentration at 150g/L, behind the leaching 30min, impurity such as iron, titanium and most of silicon are stayed and are formed red mud in the solid phase, after removing by filter red mud, obtain clarifying sodium aluminate solution; By the analysis revealed to red mud and mother liquor sodium aluminate, the solubility rate of aluminum oxide reaches 97.1%.
Above-mentioned filtrate (sodium aluminate solution) is added the sodium white residue, carried out desiliconization 4 hours, obtain the sodium aluminate solution of desiliconization, discard after the red mud filter cake washing at 170 ℃.
The sodium aluminate solution of desiliconization is added aluminium hydroxide crystal seed, according to conventional Bayer process, decomposing 70 ℃ of initial temperature, decompose warm 50 ℃ eventually, 70 hours resolving times, seed load is to carry out seed under the 50g/L to decompose, and obtains the aluminium hydroxide coarse-grain and the seed precipitation solution of white, the aluminium hydroxide coarse-grain obtains aluminium hydroxide product 21.7g after washing, drying.
Seed precipitation solution heating evaporation to sodium oxide concentration is 500g/L, at 60 ℃ of following thermostatical crystallization 6h, adds sodium aluminate crystal seed (seed load is with the 10wt% of system sodium aluminate total amount) simultaneously, obtains sodium aluminate crystal and crystalline mother solution; Filter to isolate the sodium aluminate crystal, crystalline mother solution turns back to fused salt stripping step and carries out the stripping of bauxite.
Embodiment 4
In alkaline-resisting reactor, 25.6g 80wt% aqueous sodium hydroxide solution (adding the water preparation by 20.1 gram industrial sodium hydroxides (wherein remove sodium hydroxide 94.4%)) and 20g are milled to 100 purpose Guizhou bauxite (alumina content is 66.8% in the bauxite) mix (the mol ratio 1.8:1 of sodium oxide and aluminum oxide in the mixture).In reactor, mixed solution is heated to 400 ℃, under this temperature, reacts 30min, aluminum oxide and sodium hydroxide in the bauxite are fully reacted, obtain containing the stripping grog of sodium aluminate.This stripping grog that contains sodium aluminate is cooled to about 100 ℃, add 95 ℃ hot water and make to leach in the sodium aluminate solution of back sodium oxide concentration at 110g/L, behind the leaching 30min, impurity such as iron, titanium and most of silicon are stayed and are formed red mud in the solid phase, after removing by filter red mud, obtain clarifying sodium aluminate solution; By the analysis revealed to red mud and mother liquor sodium aluminate, the solubility rate of aluminum oxide reaches 96.8%.
Above-mentioned filtrate (sodium aluminate solution) is added the sodium white residue, carried out desiliconization 4 hours, obtain the sodium aluminate solution of desiliconization, discard after the red mud filter cake washing at 170 ℃.
The sodium aluminate solution of desiliconization is added aluminium hydroxide crystal seed, according to conventional Bayer process, decomposing 70 ℃ of initial temperature, decompose warm 50 ℃ eventually, 48 hours resolving times, seed load is to carry out seed under the 50g/L to decompose, and obtains the aluminium hydroxide coarse-grain and the seed precipitation solution of white, the aluminium hydroxide coarse-grain obtains aluminium hydroxide product 7.6g after washing, drying.
Seed precipitation solution heating evaporation to sodium oxide concentration is 500g/L, at 60 ℃ of following thermostatical crystallization 6h, adds sodium aluminate crystal seed (seed load is with the 10wt% of system sodium aluminate total amount) simultaneously, obtains sodium aluminate crystal and crystalline mother solution; Filter to isolate the sodium aluminate crystal, crystalline mother solution turns back to fused salt stripping step and carries out the stripping of bauxite.
Claims (9)
1, a kind of technology of processing bauxite to produce hydroted alumina with sodium hydroxide molten salt growth method comprises the steps:
(A) fused salt stripping:
Mol ratio 1.4～2.0:1 according to sodium oxide and aluminum oxide stirs with 30～80wt% aqueous sodium hydroxide solution and 60～300 purpose bauxite ore particles, mix, mixed solution is heated to 320～600 ℃, reaction 5min～2h, aluminum oxide and sodium hydroxide in the bauxite are fully reacted, obtain containing the stripping grog of sodium aluminate;
(B) sodium aluminate leaches:
The stripping grog that contains sodium aluminate that step (A) is obtained is cooled to 100 ℃, and with leaching liquid leaching, iron, titanium and most of silicon are stayed and formed red mud in the solid phase, remove by filter red mud after, obtain clarifying sodium aluminate solution; This filtrate is carried out deep desilication, obtain the sodium aluminate solution of desiliconization, discard after the red mud filter cake washing;
The red mud filter cake washing water turn back to the leaching of step (B), as the leaching liquid of the stripping grog that contains sodium aluminate;
(C) sodium aluminate solution kind branch:
The sodium aluminate solution of the desiliconization that step (B) is obtained adds aluminium hydroxide crystal seed, carries out seed and decompose under the condition of conventional Bayer process, obtains aluminium hydroxide coarse-grain and seed precipitation solution, and the aluminium hydroxide coarse-grain obtains the aluminium hydroxide product after washing, drying;
(D) seed precipitation solution evaporation and crystallization
The seed precipitation solution that step (C) is obtained carries out evaporative crystallization, after the sodium oxide concentration that heating evaporation contains to it is 500～700g/L, carries out crystallization at 45～120 ℃ of following constant temperature 0.5～6h, adds the sodium aluminate crystal seed simultaneously, obtains sodium aluminate crystal and crystalline mother solution; Filter to isolate the sodium aluminate crystal, crystalline mother solution turns back to step (A) and is used for stripping bauxite;
The sodium aluminate crystal that obtains or sell with product form, or be dissolved in water into and turn back to step (C) behind the sodium aluminate solution and carry out seed and decompose.
2, the technology of processing bauxite to produce hydroted alumina with sodium hydroxide molten salt growth method as claimed in claim 1 is characterized in that: aqueous sodium hydroxide solution in the described step (A) and bauxite ore particles feed intake according to the mol ratio 1.5～1.8:1 of sodium oxide and aluminum oxide.
3, the technology of processing bauxite to produce hydroted alumina with sodium hydroxide molten salt growth method as claimed in claim 1 is characterized in that: in the described step (A) mixed solution is heated to 350～500 ℃.
4, the technology of processing bauxite to produce hydroted alumina with sodium hydroxide molten salt growth method as claimed in claim 1, it is characterized in that: the sodium hydroxide in the aqueous sodium hydroxide solution of described step (A) is the sodium hydroxide of analytical pure sodium hydroxide, technical grade, or contains the compounding substances of sodium hydroxide.
5, the technology of processing bauxite to produce hydroted alumina with sodium hydroxide molten salt growth method as claimed in claim 1 is characterized in that: the crystalline mother solution that the aqueous sodium hydroxide solution of described step (A) returns from step (D).
6, the technology of processing bauxite to produce hydroted alumina with sodium hydroxide molten salt growth method as claimed in claim 1 is characterized in that: the leaching liquid of described step (B) is a water; The amount that adds leaching liquid is advisable between 100～150g/L with sodium oxide concentration in the sodium aluminate solution after leaching.
7, the technology of processing bauxite to produce hydroted alumina with sodium hydroxide molten salt growth method as claimed in claim 1, it is characterized in that: deep desilication is 150～170 ℃ of desiliconizations 2～4 hours with filtrate in the described step (B), adopt Bayer red mud, or sodium white residue, kaolinite, bauxite, coal dust, activated carbon powder, iron powder, quartz sand are as crystal seed; Or add down above-mentioned crystal seed desiliconizations 2～4 hours, and then under this temperature, add the desiliconization 0.5～4 hour again of 5～10g/L calcium oxide or calcium aluminate at 90～120 ℃.
8, the technology of processing bauxite to produce hydroted alumina with sodium hydroxide molten salt growth method as claimed in claim 1, it is characterized in that: the condition of conventional Bayer process is specially and decomposes 60～75 ℃ of initial temperature in the described step (C), decompose warm 40～50 ℃ eventually, resolving time is 40～70 hours, and seed load is 50～250g/L.
9, the technology of processing bauxite to produce hydroted alumina with sodium hydroxide molten salt growth method as claimed in claim 1 is characterized in that: add the addition of sodium aluminate crystal seed in the described step (D) to reach 5～20wt% of system sodium aluminate total amount.
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2006
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102180495A (en) * | 2011-01-07 | 2011-09-14 | 潘爱芳 | Method for producing aluminum oxide by using bauxite |
| CN102180495B (en) * | 2011-01-07 | 2013-04-24 | 潘爱芳 | Method for producing aluminum oxide by using bauxite |
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