CN103663520B - A kind of grey black Bayer digestion of bauxite alumina-producing method - Google Patents
A kind of grey black Bayer digestion of bauxite alumina-producing method Download PDFInfo
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- CN103663520B CN103663520B CN201310651914.XA CN201310651914A CN103663520B CN 103663520 B CN103663520 B CN 103663520B CN 201310651914 A CN201310651914 A CN 201310651914A CN 103663520 B CN103663520 B CN 103663520B
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- bauxite
- grey black
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- alumina
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- 229910001570 bauxite Inorganic materials 0.000 title claims abstract description 62
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 45
- 230000029087 digestion Effects 0.000 title claims abstract description 37
- 238000004090 dissolution Methods 0.000 claims abstract description 51
- 239000002002 slurry Substances 0.000 claims abstract description 27
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000000243 solution Substances 0.000 claims abstract description 18
- 238000002360 preparation method Methods 0.000 claims abstract description 17
- 238000005406 washing Methods 0.000 claims abstract description 16
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000011734 sodium Substances 0.000 claims abstract description 11
- 229910001388 sodium aluminate Inorganic materials 0.000 claims abstract description 11
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims abstract description 10
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims abstract description 10
- 229910021502 aluminium hydroxide Inorganic materials 0.000 claims abstract description 10
- 229910052681 coesite Inorganic materials 0.000 claims abstract description 10
- 229910052906 cristobalite Inorganic materials 0.000 claims abstract description 10
- 239000012452 mother liquor Substances 0.000 claims abstract description 10
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052708 sodium Inorganic materials 0.000 claims abstract description 10
- 229910052682 stishovite Inorganic materials 0.000 claims abstract description 10
- 229910052905 tridymite Inorganic materials 0.000 claims abstract description 10
- 238000000926 separation method Methods 0.000 claims abstract description 9
- 238000010790 dilution Methods 0.000 claims abstract description 8
- 239000012895 dilution Substances 0.000 claims abstract description 8
- 238000001556 precipitation Methods 0.000 claims abstract description 8
- 238000007670 refining Methods 0.000 claims abstract description 8
- 238000002386 leaching Methods 0.000 claims description 10
- 229910052717 sulfur Inorganic materials 0.000 abstract description 20
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 abstract description 19
- 239000011593 sulfur Substances 0.000 abstract description 19
- 239000000126 substance Substances 0.000 abstract description 18
- 238000004519 manufacturing process Methods 0.000 abstract description 15
- 230000002411 adverse Effects 0.000 abstract description 5
- 229910052593 corundum Inorganic materials 0.000 description 8
- 229910001845 yogo sapphire Inorganic materials 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 238000004131 Bayer process Methods 0.000 description 3
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical group [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 3
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052938 sodium sulfate Inorganic materials 0.000 description 2
- 235000011152 sodium sulphate Nutrition 0.000 description 2
- 206010039509 Scab Diseases 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- MKFSKDNWNFVYQB-UHFFFAOYSA-N [C].[Na].[V] Chemical compound [C].[Na].[V] MKFSKDNWNFVYQB-UHFFFAOYSA-N 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 229910001648 diaspore Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 235000021321 essential mineral Nutrition 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000037390 scarring Effects 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
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- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Paper (AREA)
Abstract
The invention discloses a kind of grey black Bayer digestion of bauxite alumina-producing method,, seeded precipitation refining including broken, the preparation of raw ore slurry of bauxite, pre-desiliconizing, high pressure digestion, dilution, red-mud separation and washing, sodium aluminate solution, aluminium hydroxide classification and washing, roasting, in described pre-desiliconizing operation, the addition of grey black bauxite is with the α of dissolution sodium aluminatek: 1.34-1.45 calculates and is added, and the addition of Calx is with CaO and bauxite SiO2Mass ratio: C/S:1.35-1.60 calculates and is added；In described high pressure digestion technique, the concentration N of circulating mother liquork: 200-220g/L。The dissolution rate of aluminium oxide can be effectively improved by the enforcement of the program, reduce sulfur, organic dissolution rate, reduce sulfur to greatest extent and Organic substance enters sodium aluminate solution, it is to avoid the quality of production system and aluminium hydroxide is adversely affected。
Description
Technical field
The invention belongs to Bayer method alumina production method, particularly a kind of production method utilizing grey black Bayer digestion of bauxite aluminium oxide。
Background technology
Grey black bauxite is distributed more widely in China, only in Guizhou Province, explored grey black ore deposit just reaches more than 2,000 ten thousand tons, and along with alumina producing scale constantly becomes big, yield improves constantly, high-quality bauxite resource constantly reduces, and the application of putting into production of grey black bauxite is unavoidable realistic problem。Grey black ore deposit is and the bauxite of coal association, and essential mineral form is diaspore, owing to it contains higher sulfur and Organic substance, is not suitable for being directly used in Bayer process and produces。
Sulfur in bauxite not only causes Na2The loss of O and S in solution2 2-Content can make steel be corroded after improving, and increases iron content in solution, directly affects end product quality, moreover it is possible to make Al2O3Dissolution rate decline。The harm maximum in bayer liquors of sodium sulfate is that it is under appropriate conditions with double salt carbon sodium vanadium (Na2CO3·2Na2SO4) form precipitate out。This double salt scabs in mother liquid evaporation device and dissolution pipeline so that it is heat transfer coefficient reduces。In solution, sodium sulphate content increase makes the viscosity of solution increase, and grind and the classification of raw ore slurry are affected, and red mud setting tank overflow is muddy, and therefore the sulfur content in Bayer process production requirement Ore is lower than 0.2%。
Organic substance in bauxite is to affect alumina dissolution in the material of aqueous slkali。Along with solution recycling in alumina producing, Organic substance builds up, and it has a strong impact on production efficiency and the Financial cost of aluminium oxide, and product quality is had adverse effect。Organic substance also makes red-mud separation process particularly plant a point process to be adversely affected, finished product Al (OH)3Owing to having adsorbed Organic substance, making seed activity reduce, granularity attenuates, and whiteness declines, and color becomes taupe。Organic substance also makes the monohydrated sodium carbonate refinement precipitated out during mother liquid evaporation, it is difficult to separate。Cause salt discharge difficulty。Organic substance makes the viscosity of sodium aluminate solution increase, and is easily generated foam when conveying and stirring。
In a word, all production processes are almost had adverse effect by the sulfur in solution and Organic substance。Result of extraction is poor, scarring speed is fast, settlement separate difficulty, leaf filter punishment in advance weak effect, subsider easily run muddy, seed refinement, flat, vertical plate poor filtration effect, and solution is muddy, and finished product whiteness declines, and impurity content is high。Production procedure can be caused time serious to interrupt, make the production cannot be continuous, stable operation。
Summary of the invention
For the problems referred to above, the invention provides a kind of grey black Bayer digestion of bauxite alumina-producing method, the dissolution rate of aluminium oxide can be effectively improved by the enforcement of the program, reduce sulfur, organic dissolution rate, reduce sulfur to greatest extent and Organic substance enters sodium aluminate solution, it is to avoid the quality of production system and aluminium hydroxide is adversely affected。
The concrete technical scheme of the present invention is as follows:
A kind of grey black Bayer digestion of bauxite alumina-producing method,, seeded precipitation refining including broken, the preparation of raw ore slurry of bauxite, pre-desiliconizing, high pressure digestion, dilution, red-mud separation and washing, sodium aluminate solution, aluminium hydroxide classification and washing, roasting, in described pre-desiliconizing operation, the addition of grey black bauxite is with the α of dissolution sodium aluminatek: 1.34-1.45 calculates and is added, and the addition of Calx is with CaO and bauxite SiO2Mass ratio: C/S:1.30-1.60 calculates and is added；In described high pressure digestion technique, the concentration N of circulating mother liquork: 200-220g/L。
Further, in described pre-desiliconizing operation, the addition of grey black bauxite is with the α of dissolution sodium aluminatek: 1.37-1.42 calculates and is added, and the addition of Calx is with CaO and bauxite SiO2Mass ratio: C/S:1.35-1.50 calculates and is added；In described high pressure digestion technique, the concentration N of circulating mother liquork: 200-210g/L。
Further, the fine definition of bauxite slurry that described raw ore slurry preparation section is prepared is: 5%≤160# 20%。
Further, the fine definition of bauxite slurry that described raw ore slurry preparation section is prepared is: 8%≤160#≤15%。
Further, in described pre-desiliconizing operation, temperature controls as 100-105 DEG C: time control is: 10-12h。
Further, in described high pressure dissolving out process, leaching temperature: 275-280 DEG C, dissolution pressure: 5.3～5.5Mpa。
Further, in described high pressure dissolving out process, leaching temperature: 275-280 DEG C, dissolution pressure: 5.3～5.4Mpa。
The present invention passes through the adjustment to component materials proportionings various in dissolving-out process and strictly controls, and dissolving-out process is further optimized, it is effectively improved the dissolution rate of aluminium oxide, and sulfur and organic dissolution rate are substantially reduced, thus eliminating the harm to production system of sulfur and Organic substance, further ensure the production efficiency of Bayer process aluminium oxide。Adopting this technical field common process and present invention process at present to produce respectively, the contrast of whole production effect concrete condition (is analyzed) as shown in the table with the red mud component ratio generated:
Contrast the sulfur under above two difference leaching condition and Organic substance and Al2O3Dissolution rate, it has been found that by the present invention, Al2O3Dissolution rate be greatly improved, sulfur and organic dissolution rate are substantially reduced。Al after amplified production2O3Dissolution rate be stably held in more than 95%, sulfur and organic dissolution rate about 10%, reduce production cost 200 yuan/t AH。
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described further:
Specific embodiment 1
A kind of grey black Bayer digestion of bauxite alumina-producing method,, seeded precipitation refining including broken, the preparation of raw ore slurry of grey black bauxite, pre-desiliconizing, high pressure digestion, dilution, red-mud separation and washing, sodium aluminate solution, aluminium hydroxide classification and washing, roasting, the fine definition of bauxite slurry prepared at raw ore slurry preparation section is: 10%≤160# 20%；In pre-desiliconizing operation, the addition of grey black bauxite is with the α of dissolution sodium aluminatek=1.34 calculating are added, and the addition of Calx is with CaO and bauxite SiO2Mass ratio: C/S=1.30 calculates and is added, and it is 100 DEG C that temperature controls, and the time controls as 10h；In high pressure digestion technique, the concentration N of circulating mother liquork=200g/L, leaching temperature is 275 DEG C, and dissolution pressure is 5.3Mpa。
By above-mentioned technique Al2O3Dissolution rate: 90.49%；Sulfur dissolution rate S:12.86%；Organic substance dissolution rate: 9.48%。
But the Al in existing technique2O3Dissolution rate: 72.23%；Sulfur dissolution rate S:77.76%；Organic substance dissolution rate: 53.36%。The grey black Bayer digestion of bauxite alumina-producing method of the visible present invention, relative to prior art, has prominent substantive distinguishing features and significant technological progress。
Specific embodiment 2
A kind of grey black Bayer digestion of bauxite alumina-producing method,, seeded precipitation refining including broken, the preparation of raw ore slurry of grey black bauxite, pre-desiliconizing, high pressure digestion, dilution, red-mud separation and washing, sodium aluminate solution, aluminium hydroxide classification and washing, roasting, the fine definition of bauxite slurry prepared at raw ore slurry preparation section is: 8%≤160#≤15%；In pre-desiliconizing operation, the addition of grey black bauxite is with the α of dissolution sodium aluminatek=1.45 calculating are added, and the addition of Calx is with CaO and bauxite SiO2Mass ratio: C/S=1.60 calculates and is added, and it is 105 DEG C that temperature controls, and the time controls as 12h；In high pressure digestion technique, the concentration N of circulating mother liquork=220g/L, leaching temperature is 280 DEG C, and dissolution pressure is 5.5Mpa。
By above-mentioned technique Al2O3Dissolution rate: 95.03%；Sulfur dissolution rate S:10.88%；Organic substance dissolution rate: 7.53%。
Specific embodiment 3
A kind of grey black Bayer digestion of bauxite alumina-producing method,, seeded precipitation refining including broken, the preparation of raw ore slurry of grey black bauxite, pre-desiliconizing, high pressure digestion, dilution, red-mud separation and washing, sodium aluminate solution, aluminium hydroxide classification and washing, roasting, the fine definition of bauxite slurry prepared at raw ore slurry preparation section is: 5%≤160#≤15%；In pre-desiliconizing operation, the addition of grey black bauxite is with the α of dissolution sodium aluminatek=1.42 calculating are added, and the addition of Calx is with CaO and bauxite SiO2Mass ratio: C/S=1.50 calculates and is added, and it is 100 DEG C that temperature controls, and the time controls as 10h；In high pressure digestion technique, the concentration N of circulating mother liquork=210g/L, leaching temperature is 280 DEG C, and dissolution pressure is 5.4Mpa。
By above-mentioned technique Al2O3Dissolution rate: 96.12%；Sulfur dissolution rate S:10.02%；Organic substance dissolution rate: 7.18%。
Specific embodiment 4
A kind of grey black Bayer digestion of bauxite alumina-producing method,, seeded precipitation refining including broken, the preparation of raw ore slurry of grey black bauxite, pre-desiliconizing, high pressure digestion, dilution, red-mud separation and washing, sodium aluminate solution, aluminium hydroxide classification and washing, roasting, the fine definition of bauxite slurry prepared at raw ore slurry preparation section is: 8%≤160#≤15%；In pre-desiliconizing operation, the addition of grey black bauxite is with the α of dissolution sodium aluminatek=1.40 calculating are added, and the addition of Calx is with CaO and bauxite SiO2Mass ratio: C/S=1.40 calculates and is added, and it is 105 DEG C that temperature controls, and the time controls as 12h；In high pressure digestion technique, the concentration N of circulating mother liquork=205g/L, leaching temperature is 280 DEG C, and dissolution pressure is 5.3Mpa。
By above-mentioned technique Al2O3Dissolution rate: 95.52%；Sulfur dissolution rate S:10.44%；Organic substance dissolution rate: 7.42%。
Specific embodiment 5
A kind of grey black Bayer digestion of bauxite alumina-producing method,, seeded precipitation refining including broken, the preparation of raw ore slurry of grey black bauxite, pre-desiliconizing, high pressure digestion, dilution, red-mud separation and washing, sodium aluminate solution, aluminium hydroxide classification and washing, roasting, the fine definition of bauxite slurry prepared at raw ore slurry preparation section is: 8%≤160# 20%；In pre-desiliconizing operation, the addition of grey black bauxite is with the α of dissolution sodium aluminatek=1.40 calculating are added, and the addition of Calx is with CaO and bauxite SiO2Mass ratio: C/S=1.45 calculates and is added, and it is 100 DEG C that temperature controls, and the time controls as 12h；In high pressure digestion technique, the concentration N of circulating mother liquork=210g/L, leaching temperature is 275 DEG C, and dissolution pressure is 5.3Mpa。
By above-mentioned technique Al2O3Dissolution rate: 94.78%；Sulfur dissolution rate S:10.34%；Organic substance dissolution rate: 7.52%。
All simple deformation made when without departing from core of the present invention or amendment each fall within protection scope of the present invention。
Claims (7)
1. a grey black Bayer digestion of bauxite alumina-producing method,, seeded precipitation refining including broken, the preparation of raw ore slurry of bauxite, pre-desiliconizing, high pressure digestion, dilution, red-mud separation and washing, sodium aluminate solution, aluminium hydroxide classification and washing, roasting, it is characterized in that: in described pre-desiliconizing operation, the addition of grey black bauxite is with the α of dissolution sodium aluminatek: 1.34-1.45 calculates and is added, and the addition of Calx is with CaO and bauxite SiO2Mass ratio: C/S:1.30-1.60 calculates and is added；In described high pressure digestion technique, the concentration N of circulating mother liquork: 200-220g/L。
2. grey black Bayer digestion of bauxite alumina-producing method according to claim 1, it is characterised in that: in described pre-desiliconizing operation, the addition of grey black bauxite is with the α of dissolution sodium aluminatek: 1.37-1.42 calculates and is added, and the addition of Calx is with CaO and bauxite SiO2Mass ratio: C/S:1.35-1.5 calculates and is added；In described high pressure digestion technique, the concentration N of circulating mother liquork: 200-210g/L。
3. grey black Bayer digestion of bauxite alumina-producing method according to claim 1, it is characterised in that: the fine definition of bauxite slurry that described raw ore slurry preparation section is prepared is: 5%≤160# < 20%。
4. grey black Bayer digestion of bauxite alumina-producing method according to claim 1, it is characterised in that: the fine definition of bauxite slurry that described raw ore slurry preparation section is prepared is: 8%≤160#≤15%。
5. grey black Bayer digestion of bauxite alumina-producing method according to claim 1, it is characterised in that: in described pre-desiliconizing operation, temperature controls as 100-105 DEG C: time control is: 10-12h。
6. grey black Bayer digestion of bauxite alumina-producing method according to claim 1, it is characterised in that: in described high pressure dissolving out process, leaching temperature: 275-280 DEG C, dissolution pressure: 5.3～5.5MPa。
7. grey black Bayer digestion of bauxite alumina-producing method according to claim 1, it is characterised in that: in described high pressure dissolving out process, leaching temperature: 275-280 DEG C, dissolution pressure: 5.3～5.4MPa。
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| CN104591242B (en) * | 2015-02-04 | 2016-02-17 | 河北科技大学 | A kind of middle-low bauxite low calcium aluminum ratio lime sintering prepares the method for grog |
| FR3072956B1 (en) * | 2017-10-31 | 2024-03-01 | Amber Dev | BAUXITE TREATMENT PROCESS |
| CN109850929B (en) * | 2018-12-31 | 2021-03-16 | 贵州博汇联润铝业有限公司 | Method for preparing aluminum hydroxide micropowder by diluting raw ore pulp in seed precipitation tank |
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| CN100999330A (en) * | 2006-12-29 | 2007-07-18 | 中国铝业股份有限公司 | Method of producing aluminium oxide from mixed type bauxite |
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