CN100999330A - Method of producing aluminium oxide from mixed type bauxite - Google Patents
Method of producing aluminium oxide from mixed type bauxite Download PDFInfo
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- CN100999330A CN100999330A CN 200610156321 CN200610156321A CN100999330A CN 100999330 A CN100999330 A CN 100999330A CN 200610156321 CN200610156321 CN 200610156321 CN 200610156321 A CN200610156321 A CN 200610156321A CN 100999330 A CN100999330 A CN 100999330A
- Authority
- CN
- China
- Prior art keywords
- stripping
- mixed type
- bauxite
- type bauxite
- temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 229910001570 bauxite Inorganic materials 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 23
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title claims description 50
- 239000000047 product Substances 0.000 claims abstract description 14
- 239000012065 filter cake Substances 0.000 claims abstract description 12
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000007791 liquid phase Substances 0.000 claims abstract description 11
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910001388 sodium aluminate Inorganic materials 0.000 claims abstract description 10
- 238000004090 dissolution Methods 0.000 claims abstract description 6
- 239000000654 additive Substances 0.000 claims abstract description 4
- 230000000996 additive effect Effects 0.000 claims abstract description 4
- 239000003513 alkali Substances 0.000 claims description 14
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 10
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 10
- 239000004571 lime Substances 0.000 claims description 10
- 239000002002 slurry Substances 0.000 claims description 10
- 238000002386 leaching Methods 0.000 claims description 8
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 7
- 239000011575 calcium Substances 0.000 claims description 7
- 229910052791 calcium Inorganic materials 0.000 claims description 7
- 239000000920 calcium hydroxide Substances 0.000 claims description 7
- 235000011116 calcium hydroxide Nutrition 0.000 claims description 7
- 238000005406 washing Methods 0.000 claims description 4
- 238000005304 joining Methods 0.000 claims description 3
- 229910001648 diaspore Inorganic materials 0.000 abstract description 9
- 230000007423 decrease Effects 0.000 abstract description 3
- 239000000203 mixture Substances 0.000 abstract 5
- 229920002472 Starch Polymers 0.000 abstract 2
- 239000007788 liquid Substances 0.000 abstract 2
- 239000002114 nanocomposite Substances 0.000 abstract 2
- 235000019698 starch Nutrition 0.000 abstract 2
- 239000008107 starch Substances 0.000 abstract 2
- 241001126923 Calcarea Species 0.000 abstract 1
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 238000002360 preparation method Methods 0.000 abstract 1
- 239000011435 rock Substances 0.000 abstract 1
- 229910001593 boehmite Inorganic materials 0.000 description 17
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 16
- 229910001679 gibbsite Inorganic materials 0.000 description 16
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical compound O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 description 15
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 10
- 229910021502 aluminium hydroxide Inorganic materials 0.000 description 10
- 239000012141 concentrate Substances 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 8
- 239000000377 silicon dioxide Substances 0.000 description 8
- 238000000354 decomposition reaction Methods 0.000 description 6
- 230000029087 digestion Effects 0.000 description 6
- 238000000926 separation method Methods 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 239000013078 crystal Substances 0.000 description 5
- 229910052500 inorganic mineral Inorganic materials 0.000 description 4
- 238000009413 insulation Methods 0.000 description 4
- 239000011707 mineral Substances 0.000 description 4
- 235000010755 mineral Nutrition 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 3
- 238000004131 Bayer process Methods 0.000 description 2
- 238000007701 flash-distillation Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000012452 mother liquor Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
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Abstract
This invention discloses a preparation method that mixture bauxite prepares aluminum oxide. It relates to a technology of using gibbsite-nanocomposite (or diaspore) mixture bauxite to prepare aluminum oxide. Its characteristic is: utilize calcarea as dissolution additive in dissolution process, leach mixture bauxite liquid at low temperature, separate liquid phase from bauxite liquid; blend rock the separated filter cake, leach at high temperature; mix liquid phase leached by low temperature and material starch leached by high temperature, settlement separate by red-mud, filter, get depurated sodium aluminate solution, decompose, wash, calcinate, and produce finished product aluminum oxide. This invention can be used for high temperature dissolved gibbsite-nanocomposite (or diaspore) mine starch, of which volume can be decreased 0-35%. It can decrease energy expenditure of unit energy producing dissolving system 25%-30%. It can enormously decrease energy expenditure of unit energy producing. It has high industry application value.
Description
Technical field
A kind of method of producing aluminium oxide from mixed type bauxite relates to the processing method of a kind of employing with gibbsite-boehmite (or diaspore) mixed type bauxite into alumina.
The background situation
At present, utilize pure Bayer process with gibbsite-boehmite (or diaspore) mixed type bauxite into alumina more, leaching condition generally is: 230～250 ℃ of temperature, join alkali concn 220～240g/l, 20～30 minutes time, join the average chemical constitution that calculates by two types of mineral in the ore deposit and carry out, produce by traditional Bayer process tissue.Such bauxite is in process in leaching, because gibbsitic bauxite can stripping about 100 ℃, and in the actual production process, still will be heated to gibbsitic bauxite 230～250 ℃ scope, this is to do something against one's will for the abundant reaction that guarantees boehmite (or diaspore) mineral.If we can shift to an earlier date this mineral being separated it before the high temperature stripping, just do not have this problem, is impossible with these two kinds of mineral of physical method for separation still, has also just caused the big problem of production process energy expenditure.
Summary of the invention
The objective of the invention is deficiency, a kind of method that can effectively reduce the producing aluminium oxide from mixed type bauxite of production process energy consumption is provided at above-mentioned prior art existence.
The objective of the invention is to be achieved through the following technical solutions.
A kind of method of producing aluminium oxide from mixed type bauxite is characterized in that process in leaching is that to adopt lime be leaching additive, and at low temperatures after the stripping, ore pulp is isolated liquid phase after the stripping with the mixed type bauxite slurry; After more isolating filter cake being joined the ore deposit once more, stripping at high temperature; Again the isolated liquid phase of low temperature stripping is mixed settlement separate, leaf filter with the high temperature stripping slurry, obtains the purified sodium aluminate solution through red mud, through decompose, washing, roasting, produce the finished product aluminum oxide.
The method of a kind of producing aluminium oxide from mixed type bauxite of the present invention is characterized in that the processing condition of its mixed type bauxite slurry low temperature stripping are: the stripping temperature is that 95～110 ℃, dissolution time are 1～10h.
The method of a kind of producing aluminium oxide from mixed type bauxite of the present invention is characterized in that after the low temperature stripping that it is stripping 20～60 minutes under 220～280 ℃ of temperature that isolating filter cake is joined behind the ore deposit once more.
The method of a kind of producing aluminium oxide from mixed type bauxite of the present invention, the alkali concn of joining of slip is that 180～240g/l, lime addition are lime or the milk of lime of counting ore amount 1%～3% by effective calcium when it is characterized in that its stripping, and it is 400～800g/l that ore pulp contains admittedly.
Method of the present invention, in advance gibbsite being separated with boehmite (or diaspore) is that whole ore pulps enter subsider, filter successively, and the subsider overflow converges for separating the back liquid phase with filter filtrate, and α k is 1.3～1.5; After filter cake (being mainly boehmite) is joined the ore deposit once more with circulating mother liquor, stripping at high temperature again.Twice stripping liquid phase α k all is controlled at 1.3～1.5.Liquid phase is mixed settlement separate, the leaf filter through red mud after separating with stripping slurry, obtains the purified sodium aluminate solution, adopts decomposition of crystal seed then, carries out roasting after the washing of gained aluminium hydroxide, produces the finished product aluminum oxide at last.
Method of the present invention, gibbsite separates stripping with boehmite (or diaspore) in low-temperature zone in the bauxite mixing, make high temperature section based on boehmite (or diaspore) stripping, reduced the energy dissipation that gibbsite causes in the high temperature section stripping in the bauxite.The volume of boehmite type ore pulp reduces by 30%～35% in the ore pulp, the energy consumption of the digestion series of the unit's of making production capacity also decreases more than 1/3rd, reduced the energy consumption of the unit output of digestion series in the alumina producing widely, very high industrial application value has been arranged.
Description of drawings
Fig. 1 is the process flow sheet of method of the present invention.
Embodiment
A kind of method of producing aluminium oxide from mixed type bauxite, its process in leaching are that to adopt lime be leaching additive, and at low temperatures after the stripping, ore pulp is isolated liquid phase after the stripping with the mixed type bauxite slurry; After more isolating filter cake being joined the ore deposit once more, stripping at high temperature; Again the isolated liquid phase of low temperature stripping is mixed settlement separate, leaf filter with the high temperature stripping slurry, obtains the purified sodium aluminate solution through red mud, through decompose, washing, roasting, produce the finished product aluminum oxide.The processing condition of mixed type bauxite slurry low temperature stripping are: the stripping temperature be 95～110 ℃, dissolution time be after the stripping of 1～10h low temperature isolating filter cake to join once more behind the ore deposit be stripping 20～60 minutes under 220～280 ℃ of temperature.The alkali concn of joining of slip is that 180～240g/l, lime addition are lime or the milk of lime of counting ore amount 1%～3% by effective calcium during its stripping, and it is 400～800g/l that ore pulp contains admittedly.
The objective of the invention is to be achieved through the following technical solutions.
Be controlled at 400～800g/l, lime addition 1%～3%, join alkali concn 180～240g/l, join alkali α k2.5～3.5, grind qualified ore pulp under the condition of grinding particle size+60 orders 3～15% containing admittedly, under temperature is 95～110 ℃, the condition of time 1～10h, carry out gibbsite and boehmite (or diaspore) chemical separation then.Separate the stripping under 220～280 ℃ of temperature of back ore pulp, dissolution time 20～60 minutes.Through the process preheating, the high temperature stripping, the slip flash distillation, operations such as the diluted settlement of slip, sodium aluminate solution decomposition, Aluminium hydroxide roasting make the product aluminum oxide after the flash distillation.
Embodiment 1
Adopting alumina silica ratio is 7, gibbsite and boehmite ratio were at 45: 55 mixed type bauxite, 1% milk of lime and circulation alkali liquor that adding is counted the concentrate amount by effective calcium are mixed with qualified ore pulp (gibbsite is joined ore deposit α k1.50), in temperature is 105～110 ℃, carry out gibbsite and boehmite chemical separation under the condition of time 1h, after more isolating filter cake being joined the ore deposit with circulation alkali liquor once more, after the pipeline preheating then, in stopping the insulation jar, under 220～240 ℃ stripping temperature, stripping 60 minutes, the alumina silica ratio of exsolution red mud is 1.6, the settling property of red mud is good, sodium aluminate concentrate solution obtains product aluminium hydroxide through after the decomposition of crystal seed, and the aluminum oxide quality behind the Aluminium hydroxide roasting meets country-level product standard, and enters the pressure digestion system slip than ordinary production minimizing 30.6%.
Embodiment 2
Adopting alumina silica ratio is 7, gibbsite and boehmite ratio were at 45: 55 mixed type bauxite, 1% milk of lime and circulation alkali liquor that adding is counted the concentrate amount by effective calcium are mixed with qualified ore pulp (gibbsite is joined ore deposit α k1.40), in temperature is 95～100 ℃, carry out gibbsite and boehmite chemical separation under the condition of time 8h, after more isolating filter cake being joined the ore deposit with circulation alkali liquor once more, after the pipeline preheating then, in stopping the insulation jar, under 250～260 ℃ stripping temperature, stripping 40 minutes, the alumina silica ratio of exsolution red mud is 1.7, the settling property of red mud is good, sodium aluminate concentrate solution obtains product aluminium hydroxide through after the decomposition of crystal seed, and the aluminum oxide quality behind the Aluminium hydroxide roasting meets country-level product standard, and enters the pressure digestion system slip than ordinary production minimizing 32.2%.
Embodiment 3
Adopting alumina silica ratio is 7, gibbsite and boehmite ratio were at 45: 55 mixed type bauxite, 2% milk of lime and circulation alkali liquor that adding is counted the concentrate amount by effective calcium are mixed with qualified ore pulp (gibbsite is joined ore deposit α k1.45), in temperature is 105～110 ℃, carry out gibbsite and boehmite chemical separation under the condition of time 2.5h, after more isolating filter cake being joined the ore deposit with circulation alkali liquor once more, after the pipeline preheating then, in stopping the insulation jar, under 270～280 ℃ stripping temperature, stripping 20 minutes, the alumina silica ratio of exsolution red mud is 1.3, the settling property of red mud is good, sodium aluminate concentrate solution obtains product aluminium hydroxide through after the decomposition of crystal seed, and the aluminum oxide quality behind the Aluminium hydroxide roasting meets country-level product standard, and enters the pressure digestion system slip than ordinary production minimizing 31.3%.
Embodiment 4
Adopting alumina silica ratio is 7, gibbsite and boehmite ratio were at 45: 55 mixed type bauxite, 3% milk of lime and circulation alkali liquor that adding is counted the concentrate amount by effective calcium are mixed with qualified ore pulp (gibbsite is joined ore deposit α k1.31), in temperature is 95～100 ℃, carry out gibbsite and boehmite chemical separation under the condition of time 10h, after more isolating filter cake being joined the ore deposit with circulation alkali liquor once more, after the pipeline preheating then, in stopping the insulation jar, under 270～280 ℃ stripping temperature, stripping 20 minutes, the alumina silica ratio of exsolution red mud is 1.8, the settling property of red mud is good, sodium aluminate concentrate solution obtains product aluminium hydroxide through after the decomposition of crystal seed, and the aluminum oxide quality behind the Aluminium hydroxide roasting meets country-level product standard, and enters the pressure digestion system slip than ordinary production minimizing 34.6%.
Claims (4)
1. the method for a producing aluminium oxide from mixed type bauxite is characterized in that process in leaching is that to adopt lime be leaching additive, and at low temperatures after the stripping, ore pulp is isolated liquid phase after the stripping with the mixed type bauxite slurry; After more isolating filter cake being joined the ore deposit once more, stripping at high temperature; Again the isolated liquid phase of low temperature stripping is mixed settlement separate, leaf filter with the high temperature stripping slurry, obtains the purified sodium aluminate solution through red mud, through decompose, washing, roasting, produce the finished product aluminum oxide.
2. the method for a kind of producing aluminium oxide from mixed type bauxite according to claim 1 is characterized in that the processing condition of its mixed type bauxite slurry low temperature stripping are: the stripping temperature is that 95～110 ℃, dissolution time are 1～10h.
3. the method for a kind of producing aluminium oxide from mixed type bauxite according to claim 1 is characterized in that after the low temperature stripping that it is stripping 20～60 minutes under 220～280 ℃ of temperature that isolating filter cake is joined behind the ore deposit once more.
4. the method for a kind of producing aluminium oxide from mixed type bauxite according to claim 1, the alkali concn of joining of slip is that 180～240g/l, lime addition are lime or the milk of lime of counting ore amount 1%～3% by effective calcium when it is characterized in that its stripping, and it is 400～800g/l that ore pulp contains admittedly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101563216A CN100457631C (en) | 2006-12-29 | 2006-12-29 | Method of producing aluminium oxide from mixed type bauxite |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101563216A CN100457631C (en) | 2006-12-29 | 2006-12-29 | Method of producing aluminium oxide from mixed type bauxite |
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| Publication Number | Publication Date |
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| CN100999330A true CN100999330A (en) | 2007-07-18 |
| CN100457631C CN100457631C (en) | 2009-02-04 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102826577A (en) * | 2011-06-13 | 2012-12-19 | 长沙瑞德新材料科技发展有限公司 | Two-stage digestion process of boehmite-gibbsite hybrid bauxite |
| CN103332804A (en) * | 2013-06-05 | 2013-10-02 | 云南文山铝业有限公司 | Solid-liquid separation method for tailing pulp |
| CN103663520A (en) * | 2013-12-06 | 2014-03-26 | 贵州平坝宏大铝化工有限公司 | Bayer process alumina production method adopting black-gray bauxite |
| CN105399120A (en) * | 2015-12-01 | 2016-03-16 | 中国铝业股份有限公司 | Method for adding lime in dissolution process of diaspore |
| CN108043404A (en) * | 2017-12-20 | 2018-05-18 | 中国科学院过程工程研究所 | Catalyst of removing volatile organic compounds prepared by a kind of red mud and preparation method thereof |
| CN108745332A (en) * | 2018-07-03 | 2018-11-06 | 贵州大学 | A kind of method of ardealite and high-sulfur bauxite dechlorination catalyst |
| CN113929123A (en) * | 2021-10-13 | 2022-01-14 | 靖西天桂铝业有限公司 | Production process for high-low temperature dissolution combination of multiple bauxite sources |
| CN115747513A (en) * | 2022-12-12 | 2023-03-07 | 中国铝业股份有限公司 | Bauxite processing method for improving iron recovery rate |
| CN116200608A (en) * | 2023-01-30 | 2023-06-02 | 中铝郑州有色金属研究院有限公司 | Method for recycling iron and aluminum from red mud |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100398447C (en) * | 2005-01-21 | 2008-07-02 | 中南大学 | Method for extracting alumina from high silicon bauxite |
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2006
- 2006-12-29 CN CNB2006101563216A patent/CN100457631C/en active Active
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102826577A (en) * | 2011-06-13 | 2012-12-19 | 长沙瑞德新材料科技发展有限公司 | Two-stage digestion process of boehmite-gibbsite hybrid bauxite |
| CN103332804A (en) * | 2013-06-05 | 2013-10-02 | 云南文山铝业有限公司 | Solid-liquid separation method for tailing pulp |
| CN103663520A (en) * | 2013-12-06 | 2014-03-26 | 贵州平坝宏大铝化工有限公司 | Bayer process alumina production method adopting black-gray bauxite |
| CN103663520B (en) * | 2013-12-06 | 2016-06-22 | 贵州派腾科技服务有限公司 | A kind of grey black Bayer digestion of bauxite alumina-producing method |
| CN105399120A (en) * | 2015-12-01 | 2016-03-16 | 中国铝业股份有限公司 | Method for adding lime in dissolution process of diaspore |
| CN108043404A (en) * | 2017-12-20 | 2018-05-18 | 中国科学院过程工程研究所 | Catalyst of removing volatile organic compounds prepared by a kind of red mud and preparation method thereof |
| CN108043404B (en) * | 2017-12-20 | 2021-06-15 | 中国科学院过程工程研究所 | Catalyst prepared from red mud for removing volatile organic compounds and preparation method thereof |
| CN108745332A (en) * | 2018-07-03 | 2018-11-06 | 贵州大学 | A kind of method of ardealite and high-sulfur bauxite dechlorination catalyst |
| CN113929123A (en) * | 2021-10-13 | 2022-01-14 | 靖西天桂铝业有限公司 | Production process for high-low temperature dissolution combination of multiple bauxite sources |
| CN115747513A (en) * | 2022-12-12 | 2023-03-07 | 中国铝业股份有限公司 | Bauxite processing method for improving iron recovery rate |
| CN116200608A (en) * | 2023-01-30 | 2023-06-02 | 中铝郑州有色金属研究院有限公司 | Method for recycling iron and aluminum from red mud |
| CN116200608B (en) * | 2023-01-30 | 2023-12-05 | 中铝郑州有色金属研究院有限公司 | Method for recycling iron and aluminum from red mud |
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