CN103964477B - A kind of method being reduced red mud alumina silica ratio by multistage carbonation - Google Patents
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Abstract
The invention belongs to bauxite resource and utilize field, be specifically related to a kind of method being reduced red mud alumina silica ratio by multistage carbonation.First lime mix with middle-low grade aluminiferous material by the present invention, stirs and carry out calcification isomerization in water or sodium aluminate solution, obtains calcification slag transition and mix in encloses container with clear water or low-concentration alkali liquor, in encloses container, pass into CO
2, carry out carbonization transformation and obtain carbide slag, alkali lye is mixed with carbide slag, obtain, containing aluminium dissolution fluid and solid slag, carrying out 1 ~ 4 carbonization and molten aluminium to solid slag, until aluminum oxide and siliconoxide mass ratio are down to 0.2 ~ 0.5 in the novel texture red mud finally obtained.The novel texture red mud that process of the present invention obtains alkali-free and aluminium in theory, alumina silica ratio can drop to less than 0.5, and in red mud, sodium oxide content is lower than 0.6%, achieves the cleaner production of aluminum oxide industry and the utilization of red mud.
Description
Technical field
The invention belongs to bauxite resource and utilize field, be specifically related to a kind of method being reduced red mud alumina silica ratio by multistage carbonation.
Background technology
Bayer process produces the major processes of aluminum oxide, and in alumina producing Bayer process process, ore obtains sodium aluminate solution and red mud through operations such as fragmentation, high pressure digestion, settlement separate and washings, and red mud is drained as waste or stored up.The dominant of Bayer process red mud is hydrated aluminum silicate mutually, and its molecular formula is roughly equivalent to Na
2oAl
2o
31.7SiO
2nH
2o.Because Bayer process red mud dominant phase structure is hydrated aluminum silicate, create two problems: (1) when ore grade is low, silica content height time, cause a large amount of alumina loss; (2) in red mud, sodium oxide content is high, and caustic alkali in production process is consumed in a large number.The high-alkali red mud waste simultaneously produced brings environment hidden danger.Under the background that China's high-quality higher-grade bauxite consumes gradually, bauxite resource is efficient, cleaner production aluminum oxide how to utilize middle-low grade to contain, and is the strategic problem that China's aluminum oxide industry must solve.
Current China produces with middle-low grade aluminum-containing raw material, it is more to extract the method for aluminum oxide." alumina production process by using monohydrate bauxite lime Bayer process, publication number CN1380253A " that the people such as the fourth safety of Chinese Aluminium Co., Ltd propose discloses and add the suitably excessive lime additive of more conventional Bayer process in Bayer process production technique, ore pulp is through pre-desiliconizing process, carry out conventional Bayer process process again, considerably reduce technological process alkaline consumption, use the method can reduce the soda content in red mud, but cause alumina silica ratio in tailings to rise because lime excessive adds membership, reduce the utilising efficiency of aluminum oxide, " a kind of combined desiliconisation method of low-grade bauxite, publication number CN101306399A " of people's inventions such as the Chen Xiangqing of Chinese Aluminium Co., Ltd discloses and adopts the process integration of Selective desliming and direct flotation to carry out desiliconization, thus improve the A/S ratio of raw ore, reach the object reducing production cost, this process improves the organic efficiency of aluminum oxide by the method improving raw ore alumina silica ratio, but flotation can produce a certain amount of mine tailing, therefore improve the solid waste total release in aluminum oxide production process, Northeastern University is in " a kind of method of comprehensive utilization of high iron low grade bauxite of people's inventions such as petrel, publication number CN102583477 " disclose and high iron low grade bauxite is first extracted most of aluminum oxide by the bayer process adding superfluous lime, the low alkali red mud produced takes the prereduction of coal-based rotary hearth furnace process technology, then adopt iron bath Oygen And Coal Blowing Technology to realize aluminium slag/iron high temperature melting to be separated, the aluminium slag formed generates calcium aluminate after modified, low carbon acid sodium solution is adopted to leach calcium aluminate slag again, its invention ensure that the extraction of efficiently dissociating of iron aluminium, feasible in technology and economic benefit, this process is used to produce aluminum oxide, although the tailings main component of sintering process is Calucium Silicate powder, calcium aluminate, alumina silica ratio is lower than existing Bayer process process, but production process needs through the higher sintering process of energy consumption, economic benefit is poor, the Zhang Yifei of Chinese Academy Of Sciences Process Engineering Research Institute propose " low-temperature low-pressure hydro chemical method reclaims aluminum oxide and sodium oxide in red mud, publication number CN101538058 " disclose red mud filter cake and milk of lime are added in strong caustic, heating, after solid-liquor separation, red mud filter cake adds the milk of lime degree of depth by hydrothermal method again and takes off sodium, A/S and N/S in red mud can be made to drop to less than 0.18 simultaneously, for the low pollution emission of red mud and resource utilization provide a new way, although this technology reduces alumina silica ratio in red mud and sodium-silicon-rate by pressurization hydration process, improve the yield of mineral, but the method need be carried out under high alkali liquid and higher molecular ratio situation, therefore the mass flow of production process is very large, energy consumption is also higher, in high molecule ratio sodium aluminate solution, the removal process of aluminum oxide also needs to adopt the methods such as evaporation simultaneously, further increase the energy consumption of production process.
Although above technique can improve the extraction yield of aluminum oxide to a certain extent and reduce the content of sodium oxide in red mud, there is the factors such as the high and aluminum oxide of long flow path, energy consumption, sodium oxide comprehensive recovery are low more, still undesirable in actual production.
Summary of the invention
Frequently exhaustion is faced for current China higher-grade bauxite, cause the problem that existing bayer process alumina recovery rate is low, alkaline consumption increases and high-alkali red mud is stored up in a large number, the invention provides a kind of method being reduced red mud alumina silica ratio by multistage carbonation, object is from change red mud phase structure angle, realize efficient, the cleaner production of China's middle-low bauxite, and a large amount of comprehensive utilization containing alkali red mud.
The object of the invention is to be achieved through the following technical solutions:
(1) calcification makes the transition:
First by lime with middle-low grade aluminiferous material according to mass ratio (0.25 ~ 0.8): 1 mixes, at 100 ~ 260 DEG C in water or sodium aluminate solution stirring reaction 15 ~ 60min, after solid-liquid separation, obtain with hydrous calcium aluminate silicon be dominant phase calcification slag transition and containing alkaline wash, the liquid-solid ratio of water or sodium aluminate solution and solid materials is (3 ~ 10) mL:1g;
Middle-low bauxite is in process in leaching, and the aluminum oxide in ore and soluble silica are respectively with Al (OH)
4 -and H
2siO
4 2-form enter sodium aluminate solution, its reaction is as follows:
AlOOH+NaOH+H
2O→NaAl(OH)
4；
Al
2O
3·2SiO
2·2H
2O+NaOH→NaAl(OH)
4+Na
2H
2SiO
4；
Under the existence of lime, there is calcify reaction:
NaAl(OH)
4+Na
2H
2SiO
4+CaO+H
2O→3CaO·Al
2O
3·xSiO
2·(6-2x)H
2O+NaOH；
The reaction of red mud calcification transformation process is as follows:
Na
2O·Al
2O
3·1.7SiO
2·nH
2O+CaO+H
2O→3CaO·Al
2O
3·xSiO
2·(6-2x)H
2O+NaOH；
Calcification isomerization obtains taking calcium aluminosilicate hydrate as the calcification slag of dominant phase;
(2) carbonization is decomposed:
The slag that calcification made the transition mixes in encloses container with clear water or low-concentration alkali liquor, in encloses container, pass into CO
2stirring reaction 30 ~ 240min at 60 ~ 160 DEG C, solid-liquid separation, obtains the carbide slag of hydrous calcium aluminate silicon containing calcium carbonate, calcium silicate hydrate, aluminium hydroxide and non-complete reaction, and the make the transition liquid-solid ratio of slag of clear water or low-concentration alkali liquor and calcification is (3 ~ 15) mL:1g;
The reaction of carbonization decomposition course is as follows:
3CaO·Al
2O
3·xSiO
2·(6-2x)H
2O+CO
2+H
2O→Ca
2SiO
4+CaCO
3+Al(OH)
3
Carbide slag main component is Calucium Silicate powder, calcium carbonate and aluminium hydroxide;
(3) the molten aluminium of alkaline process:
Sodium hydroxide solution or sodium aluminate solution are mixed with carbide slag, stirring 15 ~ 60min is reacted at 40 ~ 100 DEG C, the aluminium hydroxide in carbide slag is made to be dissolved in sodium hydroxide solution or sodium aluminate solution, solid-liquid separation, obtain dissolution fluid and solid slag, the liquid-solid ratio of sodium hydroxide solution or sodium aluminate solution and carbide slag is (3 ~ 10) mL:1g;
(4) multistage carbonation-molten aluminium:
Solid slag repeating step (2) after molten for alkaline process aluminium and step (3) are processed 1 ~ 4 time, until aluminum oxide and siliconoxide mass ratio are down to 0.2 ~ 0.5 in the novel texture red mud finally obtained.
Wherein, middle-low grade aluminiferous material refers to that aluminum oxide and siliconoxide mass in mineral are than one or more in the middle-low bauxite of < 7, Bayer process red mud, flyash, wherein said Bayer process red mud or carry out in aqueous containing the calcification process of mixture of Bayer process red mud, other material calcification carries out transition in sodium aluminate solution.
Described lime is fired by Wingdale, but the calcification raw material that production process uses is not limited to the lime fired, and calcification raw material can comprise any material being principal constituent with calcium oxide or calcium hydroxide.
In described step (1), in sodium aluminate solution, caustic sodium concentration is 140 ~ 260g/L, and the mol ratio of sodium oxide and aluminum oxide is 2.5 ~ 3.5.
Described CO
2partial pressure is 0.1 ~ 1.6MPa.
Described low-concentration alkali liquor refers to any one in sodium aluminate solution, sodium hydroxide solution, sodium carbonate solution, and it is in the mass concentration≤50g/L of sodium oxide.
In described step (3), concentration of sodium hydroxide solution is 20 ~ 100g/L, and in sodium aluminate solution, causticity paper mill wastewater is 30 ~ 180g/L.
Described CO
2and between sodium hydroxide solution or sodium aluminate solution the flow pattern of material be and flow, adverse current or cross-flow.
Production method of the present invention also can be used for the aluminum oxide production process of alumina silica ratio higher than this scope.
Compared with prior art, feature of the present invention and beneficial effect are:
(1) the present invention can effectively utilize low-grade aluminiferous material, by balancing the structural transformation of solid phase for Calucium Silicate powder and calcium carbonate by the above-mentioned material production alumina process of use, make tailings alkali-free and aluminium in theory, realize the cleaner production of aluminum oxide industry and the utilization of red mud, use the method process middle-low bauxite, the rate of recovery of aluminum oxide reaches more than 80%, and the red mud alumina silica ratio of generation can drop to less than 0.5, and in red mud, sodium oxide content is lower than 0.6%; Process Bayer process red mud, alumina recovery rate reaches more than 60%, and red mud alumina silica ratio and sodium oxide content can be made to drop to below 0.24 and 0.15% respectively;
(2) the present invention can realize the cleaner production of aluminum oxide industry, and the novel texture red mud that the present invention produces is low containing alkali, can be used for the field such as cement, building materials, arranges requirement outside also can meeting, and fundamentally solves red mud and takes up an area the problems such as contaminate environment;
(3) the invention belongs to Whote-wet method flow process, production energy consumption is low.
Accompanying drawing explanation
Fig. 1 is process flow diagram of the present invention.
Embodiment
Illustrated embodiment of the present invention adopts low-grade bauxite and Bayer process red mud to be raw material.
Material chemical component (wt, %):
Bauxite Al
2o
3: 49.60%, SiO
2: 11.36%, Fe
2o
3: 14.65%, igloss: 24.37%;
Red mud Al
2o
3: 20.30%, SiO
2: 33.82%, Fe
2o
3: 23.44%, Na
2o:10.17%, igloss: 9.7%;
Purity is adopted to be greater than the CO of 99% in illustrated embodiment of the present invention
2as source of the gas, but the production method described in this technology is not limited to this origin, any containing CO
2gas all can be used as the source of the gas of carbonization process;
The clear water used in the carbonization process of illustrated embodiment of the present invention or low-concentration alkali liquor can recycle in this process;
The mode that dissolution fluid in illustrated embodiment of the present invention after the molten aluminium of alkaline process can collaborate to be divided by kind afterwards with Bayer system extracts aluminum oxide wherein.
Embodiment 1
(1) first lime is mixed according to mass ratio 0.25:1 with middle-low bauxite, the mol ratio being 260g/L, sodium oxide and aluminum oxide at caustic sodium concentration at 260 DEG C is stirring reaction 15min in the sodium aluminate solution of 2.5, obtain with hydrous calcium aluminate silicon be dominant phase calcification transition slag, the liquid-solid ratio of sodium aluminate solution and solid materials is 10mL:1g;
(2) slag that calcification made the transition mixes in encloses container with clear water, in encloses container, pass into CO
2, CO
2partial pressure is 0.1MPa, stirring reaction 240min at 160 DEG C, obtains the carbide slag of hydrous calcium aluminate silicon containing calcium carbonate, calcium silicate hydrate, aluminium hydroxide and non-complete reaction, and the make the transition liquid-solid ratio of slag of clear water and calcification is 15mL:1g;
(3) be that the sodium hydroxide solution of 20g/L mixes with carbide slag by concentration, at 100 DEG C, 60min is stirred in reaction, and make the aluminium hydroxide in carbide slag be dissolved in sodium hydroxide solution, the liquid-solid ratio of sodium hydroxide solution and carbide slag is 10mL:1g;
(4) the solid slag repeating step (2) after molten for alkaline process aluminium and step (3) are processed 1 time, after secondary carbonization-molten aluminium process, in novel texture red mud, alumina silica ratio is down to 0.48, and sodium oxide content is 0.58%.
Embodiment 2
(1) first lime is mixed according to mass ratio 0.35:1 with middle-low bauxite, the mol ratio being 140g/L, sodium oxide and aluminum oxide at caustic sodium concentration at 200 DEG C is stirring reaction 60min in the sodium aluminate solution of 3.5, obtain with hydrous calcium aluminate silicon be dominant phase calcification transition slag, the liquid-solid ratio of sodium aluminate solution and solid materials is 3mL:1g;
(2) slag that calcification made the transition mixes in encloses container with clear water, in encloses container, pass into CO
2, CO
2partial pressure is 1.6MPa, stirring reaction 30min at 60 DEG C, obtains the carbide slag of hydrous calcium aluminate silicon containing calcium carbonate, calcium silicate hydrate, aluminium hydroxide and non-complete reaction, and the make the transition liquid-solid ratio of slag of clear water and calcification is 3mL:1g;
(3) be that the sodium hydroxide solution of 100g/L mixes with carbide slag by concentration, at 40 DEG C, 15min is stirred in reaction, and make the aluminium hydroxide in carbide slag be dissolved in sodium hydroxide solution, the liquid-solid ratio of sodium hydroxide solution and carbide slag is 3mL:1g;
(4) the solid slag repeating step (2) after molten for alkaline process aluminium and step (3) are processed 1 time, after secondary carbonization-molten aluminium process, in novel texture red mud, alumina silica ratio is down to 0.45, and sodium oxide content is 0.56%.
Embodiment 3
(1) first lime is mixed according to mass ratio 0.8:1 with middle-low bauxite, the mol ratio being 180g/L, sodium oxide and aluminum oxide at caustic sodium concentration at 100 DEG C is stirring reaction 40min in the sodium aluminate solution of 3.0, obtain with hydrous calcium aluminate silicon be dominant phase calcification transition slag, the liquid-solid ratio of sodium aluminate solution and solid materials is 5mL:1g;
(2) slag that calcification made the transition mixes in encloses container with clear water, in encloses container, pass into CO
2, CO
2partial pressure is 1.2MPa, stirring reaction 120min at 110 DEG C, obtains the carbide slag of hydrous calcium aluminate silicon containing calcium carbonate, calcium silicate hydrate, aluminium hydroxide and non-complete reaction, and the make the transition liquid-solid ratio of slag of clear water and calcification is 7mL:1g;
(3) be that the sodium hydroxide solution of 50g/L mixes with carbide slag by concentration, at 60 DEG C, 30min is stirred in reaction, and make the aluminium hydroxide in carbide slag be dissolved in sodium hydroxide solution, the liquid-solid ratio of sodium hydroxide solution and carbide slag is 5mL:1g;
(4) the solid slag repeating step (2) after molten for alkaline process aluminium and step (3) are processed 4 times, after Pyatyi carbonization-molten aluminium process, in novel texture red mud, alumina silica ratio is down to 0.31, and sodium oxide content is 0.49%.
Embodiment 4
(1) first lime is mixed according to mass ratio 0.3:1 with middle-low bauxite, the mol ratio being 180g/L, sodium oxide and aluminum oxide at caustic sodium concentration at 160 DEG C is stirring reaction 30min in the sodium aluminate solution of 3.0, obtain with hydrous calcium aluminate silicon be dominant phase calcification transition slag, the liquid-solid ratio of sodium aluminate solution and solid materials is 7mL:1g;
(2) sodium hydroxide solution that slag and the concentration of calcification being made the transition is 10g/L mixes in encloses container, in encloses container, pass into CO
2, CO
2partial pressure is 1.0MPa, stirring reaction 120min at 110 DEG C, obtains the carbide slag of hydrous calcium aluminate silicon containing calcium carbonate, calcium silicate hydrate, aluminium hydroxide and non-complete reaction, and the make the transition liquid-solid ratio of slag of clear water and calcification is 10mL:1g;
(3) be that the sodium hydroxide solution of 80g/L mixes with carbide slag by concentration, at 60 DEG C, 45min is stirred in reaction, and make the aluminium hydroxide in carbide slag be dissolved in sodium hydroxide solution, the liquid-solid ratio of sodium hydroxide solution and carbide slag is 5mL:1g;
(4) the solid slag repeating step (2) after molten for alkaline process aluminium and step (3) are processed 2 times, after tertiary carbon-molten aluminium process, in novel texture red mud, alumina silica ratio is down to 0.42, and sodium oxide content is 0.51%.
Embodiment 5
(1) first lime is mixed according to mass ratio 0.8:1 with dry red mud, at 160 DEG C in water stirring reaction 60min, obtain with hydrous calcium aluminate silicon be dominant phase calcification transition slag, the liquid-solid ratio of water and solid materials is 10mL:1g;
(2) slag that calcification made the transition mixes in encloses container with clear water, in encloses container, pass into CO
2, CO
2partial pressure is 0.1MPa, stirring reaction 120min at 160 DEG C, obtains the carbide slag of hydrous calcium aluminate silicon containing calcium carbonate, calcium silicate hydrate, aluminium hydroxide and non-complete reaction, and the make the transition liquid-solid ratio of slag of clear water and calcification is 15mL:1g;
(3) be that the sodium hydroxide solution of 100g/L mixes with carbide slag by concentration, at 60 DEG C, 60min is stirred in reaction, and make the aluminium hydroxide in carbide slag be dissolved in sodium hydroxide solution, the liquid-solid ratio of sodium hydroxide solution and carbide slag is 4mL:1g;
(4) the solid slag repeating step (2) after molten for alkaline process aluminium and step (3) are processed 2 times, after tertiary carbon-molten aluminium process, in red mud, alumina silica ratio is down to 0.24, and sodium oxide content is 0.18%.
Embodiment 6
(1) first lime is mixed according to mass ratio 0.3:1 with dry red mud, at 100 DEG C in water stirring reaction 60min, obtain with hydrous calcium aluminate silicon be dominant phase calcification transition slag, the liquid-solid ratio of water and solid materials is 4mL:1g;
(2) sodium carbonate solution that slag and the sodium oxide concentration of calcification being made the transition is 50g/L mixes in encloses container, in encloses container, pass into CO
2, CO
2partial pressure is 1.2MPa, stirring reaction 120min at 80 DEG C, obtains the carbide slag of hydrous calcium aluminate silicon containing calcium carbonate, calcium silicate hydrate, aluminium hydroxide and non-complete reaction, and the make the transition liquid-solid ratio of slag of sodium carbonate solution and calcification is 5ml:1g;
(3) be that the sodium hydroxide solution of 40g/L mixes with carbide slag by concentration, at 80 DEG C, 60min is stirred in reaction, and make the aluminium hydroxide in carbide slag be dissolved in sodium hydroxide solution, the liquid-solid ratio of sodium hydroxide solution and carbide slag is 10mL:1g;
(4) the solid slag repeating step (2) after molten for alkaline process aluminium and step (3) are processed 3 times, after level Four carbonization-molten aluminium process, in novel texture red mud, alumina silica ratio is down to 0.22, and sodium oxide content is 0.15%.
Embodiment 7
(1) first lime is mixed according to mass ratio 0.5:1 with dry red mud, at 120 DEG C in water stirring reaction 45min, obtain with hydrous calcium aluminate silicon be dominant phase calcification transition slag, the liquid-solid ratio of water and solid materials is 7mL:1g;
(2) sodium aluminate solution that slag and the sodium oxide concentration of calcification being made the transition is 20g/L mixes in encloses container, in encloses container, pass into CO
2, CO
2partial pressure is 1.2MPa, stirring reaction 60min at 120 DEG C, obtains the carbide slag of hydrous calcium aluminate silicon containing calcium carbonate, calcium silicate hydrate, aluminium hydroxide and non-complete reaction, and the make the transition liquid-solid ratio of slag of sodium aluminate solution and calcification is 10mL:1g;
(3) be that the sodium aluminate solution of 80g/L mixes with carbide slag by caustic sodium concentration, at 60 DEG C, 60min is stirred in reaction, and make the aluminium hydroxide in carbide slag be dissolved in sodium hydroxide solution, the liquid-solid ratio of sodium aluminate solution and carbide slag is 5mL:1g;
(4) the solid slag repeating step (2) after molten for alkaline process aluminium and step (3) are processed 4 times, after Pyatyi carbonization-molten aluminium process, in novel texture red mud, alumina silica ratio is down to 0.20, and sodium oxide content is 0.12%.
Claims (9)
1. reduced a method for red mud alumina silica ratio by multistage carbonation, carry out according to following steps:
(1) calcification makes the transition:
First by lime with middle-low grade aluminiferous material according to mass ratio (0.25 ~ 0.8): 1 mixes, at 100 ~ 260 DEG C in water or sodium aluminate solution stirring reaction 15 ~ 60min, after solid-liquid separation, obtain with hydrous calcium aluminate silicon be dominant phase calcification slag transition and containing alkaline wash; Described middle-low grade aluminiferous material refers to that aluminum oxide and siliconoxide mass in mineral are than one or more in the middle-low bauxite of < 7, Bayer process red mud, flyash, wherein said Bayer process red mud or carry out in aqueous containing the calcification process of mixture of Bayer process red mud, other material calcification carries out transition in sodium aluminate solution;
(2) carbonization is decomposed:
The slag that calcification made the transition mixes in encloses container with clear water or low-concentration alkali liquor, in encloses container, pass into CO
2, stirring reaction 30 ~ 240min at 60 ~ 160 DEG C, solid-liquid separation, obtains the carbide slag of the hydrous calcium aluminate silicon containing calcium carbonate, calcium silicate hydrate, aluminium hydroxide and non-complete reaction;
It is characterized in that:
(3) the molten aluminium of alkaline process:
Sodium hydroxide solution or sodium aluminate solution are mixed with carbide slag, react stirring 15 ~ 60min at 40 ~ 100 DEG C, make the aluminium hydroxide in carbide slag be dissolved in sodium hydroxide solution or sodium aluminate solution, solid-liquid separation, obtains dissolution fluid and solid slag;
(4) multistage carbonation-molten aluminium:
Solid slag repeating step (2) after molten for alkaline process aluminium and step (3) are processed 1 ~ 4 time, until aluminum oxide and siliconoxide mass ratio are down to 0.2 ~ 0.5 in the novel texture red mud finally obtained.
2. a kind of method being reduced red mud alumina silica ratio by multistage carbonation according to claim 1, it is characterized in that in the sodium aluminate solution described in step (1), caustic sodium concentration is 140 ~ 260g/L, the mol ratio of sodium oxide and aluminum oxide is 2.5 ~ 3.5.
3. a kind of method being reduced red mud alumina silica ratio by multistage carbonation according to claim 1, is characterized in that the liquid-solid ratio of water or sodium aluminate solution and solid materials in step (1) is for (3 ~ 10) mL:1g.
4. a kind of method being reduced red mud alumina silica ratio by multistage carbonation according to claim 1, is characterized in that described CO
2partial pressure is 0.1 ~ 1.6MPa.
5. a kind of method being reduced red mud alumina silica ratio by multistage carbonation according to claim 1, it is characterized in that the low-concentration alkali liquor described in step (2) refers to any one in sodium aluminate solution, sodium hydroxide solution, sodium carbonate solution, it is in the mass concentration≤50g/L of sodium oxide.
6. a kind of method being reduced red mud alumina silica ratio by multistage carbonation according to claim 1, is characterized in that the make the transition liquid-solid ratio of slag of clear water in step (2) or low-concentration alkali liquor and calcification is (3 ~ 15) mL:1g.
7. a kind of method being reduced red mud alumina silica ratio by multistage carbonation according to claim 1, it is characterized in that the concentration of sodium hydroxide solution described in step (3) is 20 ~ 100g/L, in sodium aluminate solution, causticity paper mill wastewater is 30 ~ 180g/L.
8. a kind of method being reduced red mud alumina silica ratio by multistage carbonation according to claim 1, is characterized in that the liquid-solid ratio of sodium hydroxide solution or sodium aluminate solution and carbide slag in step (3) is for (3 ~ 10) mL:1g.
9. a kind of method being reduced red mud alumina silica ratio by multistage carbonation according to claim 1, is characterized in that described CO
2and between sodium hydroxide solution or sodium aluminate solution the flow pattern of material be and flow, adverse current or cross-flow.
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| CN105170307B (en) * | 2015-09-29 | 2017-05-10 | 河南理工大学 | Red-mud citric acid dealkalizing technique |
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| CN108296267A (en) * | 2018-02-02 | 2018-07-20 | 北京华索科技股份有限公司 | The method that industrial treatment is sintered red mud |
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| CN101538058A (en) * | 2008-03-19 | 2009-09-23 | 中国科学院过程工程研究所 | Low-temperature low-pressure hydro chemical method for recovering aluminum oxide and sodium oxide from red mud |
| CN101343074A (en) * | 2008-08-25 | 2009-01-14 | 中南大学 | Bauxite dissolving out method for reducing caustic alkali combined in prepared red mud |
| CN102757060A (en) * | 2011-09-16 | 2012-10-31 | 东北大学 | Method for dissolving Bayer process red mud |
| CN102757073A (en) * | 2011-09-16 | 2012-10-31 | 东北大学 | Method for producing aluminum oxide based on calcification-carbonization transformation |
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