CN104140122A - High sulfur bauxite pre-desulphurization method - Google Patents
High sulfur bauxite pre-desulphurization method Download PDFInfo
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- CN104140122A CN104140122A CN201310173092.9A CN201310173092A CN104140122A CN 104140122 A CN104140122 A CN 104140122A CN 201310173092 A CN201310173092 A CN 201310173092A CN 104140122 A CN104140122 A CN 104140122A
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- bauxite
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- sulfur bauxite
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Abstract
The invention discloses a high sulfur bauxite pre-desulphurization method. The method is characterized in that a solution obtained after the pre-desulphurization of high sulfur bauxite by using a sodium hydroxide solution with a low concentration in the presence of oxygen is recycled, and the concentrated solution is used to dissolve out aluminum in bauxite. The method is simple and effective. The sulfur content decreases to below 0.7% after the desulphurization pretreatment of the high sulfur bauxite, and the pre-desulphurized bauxite can be used in a barer process. The method has the advantages of low operation temperature, good desulphurization effect, low energy consumption and the like.
Description
Technical field
The pre-sulfur method that the present invention relates to a kind of high-sulfur bauxite, belongs to metallurgical technology field.
Technical background
China's aluminum oxide output increases year by year in recent years, and within 2012, China's aluminum oxide output reaches 3769.6 ten thousand tons, compared with 2011, increases by 10.3%.Be subject to the impact of China's aluminum oxide industry high speed development, China's bauxite produced quantity cumulative year after year.Within 2010, domestic bauxite output reaches 3,145 ten thousand tons, compared with 2,120 ten thousand tons of calendar year 2001 increase output, increases every year 24%, and bauxite produced quantity is very large, and ratio of exploitation and reserve belongs to highest level substantially in the whole world.Bauxite resource supportability is poor, has seriously restricted the benign development of China's aluminium industry.Along with the increasing of domestic exploitation dynamics, China's bauxite resource is not only faced with the day by day exhausted problem of resource, and mineral resources gold grade is very fast, and exploitation difficulty is large, and cost is also more and more higher.Bauxite resource scarcity has more and more become the bottleneck of China's aluminium industrial development.Therefore, we must fully develop domestic existing bauxite resource, improve Status Quo.
Sulphur content is called high-sulfur type bauxite higher than 0.8% bauxite.At present, approximately 1.5 hundred million tons of the existing reserves of China's diaspore type high-sulfur bauxite, are mainly distributed in the ground such as Guizhou, Shandong, Guangxi, Henan, Yunnan and Sichuan.While adopting Bayer process to process high-sulfur bauxite, the sulphur major part in bauxite is with S
2-form enter in solution; In bauxite, sulphur content is too high can increase alkaline consumption, etching apparatus, pollution sodium aluminate solution, and iron level in alumina product is raise, and quality product degradation, causes great harm to production process.Therefore, Bayer process is suitable for processing sulphur content lower than 0.7% bauxite.At present, high-sulfur bauxite not yet obtains large-scale industrial utilization.If utilize high-sulfur bauxite resource effective and reasonablely, can greatly alleviate the present situation of China's bauxite grade dilution and resource scarcity, improve domestic bauxite resource supportability, the development of China's aluminum oxide industry is significant.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of pre-sulfur method of high-sulfur bauxite, and its object is to solve high-sulfur bauxite and a difficult problem that cannot industrial applications too high due to sulphur content.
The present invention is achieved by the following technical solutions: in lower temperature (150～180 ℃) with pass under the condition of oxygen, utilize the sodium hydroxide solution of lower concentration to carry out pre-desulfurization to high-sulfur bauxite, the aluminium that the solution obtaining can be used in stripping bauxite after improving concentration.
The pre-sulfur method of above-mentioned high-sulfur bauxite, temperature is 150～180 ℃.
The pre-sulfur method of above-mentioned high-sulfur bauxite, desulfurization time is 4～6h.
The pre-sulfur method of above-mentioned high-sulfur bauxite, concentration of sodium hydroxide solution is 100～200g/L.
The pre-sulfur method of above-mentioned high-sulfur bauxite, Liu≤0.8% in raw material high-sulfur bauxite.
The invention has the advantages that: simple to operate, simplified sulfur removal technology, industrial to realize; Desulfurization temperature is low, has avoided high-temperature operation.
Below in conjunction with specific embodiment, the invention will be further described.Following examples are intended to illustrate the present invention rather than limitation of the invention further.
Embodiment
The Henan high-sulfur bauxite of take is tested as raw material, and its raw material is composed as follows.
Embodiment 1:
By 80g high-sulfur bauxite, 400mL concentration is 150g/L (Na
2o meter) sodium hydroxide solution is placed in autoclave, sealing, and heated and stirred, when temperature reaches 150 ℃, passes into oxygen, starts timing, reacts after 6 hours, lowers the temperature, goes out still.In bauxite after desulfurization, sulphur content is 0.49%.
Embodiment 2:
By 80g high-sulfur bauxite, 400mL concentration is 150g/L (Na
2o meter) sodium hydroxide solution is placed in autoclave, sealing, and heated and stirred, when temperature reaches 180 ℃, passes into oxygen, starts timing, reacts after 6 hours, lowers the temperature, goes out still.In bauxite after desulfurization, sulphur content is 0.32%.
Embodiment 3:
By 80g high-sulfur bauxite, 400mL concentration is 200g/L (Na
2o meter) sodium hydroxide solution is placed in autoclave, sealing, and heated and stirred, when temperature reaches 150 ℃, passes into oxygen, starts timing, reacts after 6 hours, lowers the temperature, goes out still.In bauxite after desulfurization, sulphur content is 0.50%.
Claims (6)
1. a pre-sulfur method for high-sulfur bauxite, is characterized in that: the sodium hydroxide solution that utilizes lower concentration carries out pre-desulfurization at low temperature with pass into oxygen in the situation that to high-sulfur bauxite.
2. the pre-sulfur method of a kind of high-sulfur bauxite according to claim 1, is characterized in that: Liu≤0.8% in raw material high-sulfur bauxite.
3. the pre-sulfur method of a kind of high-sulfur bauxite according to claim 1, is characterized in that: desulfurization temperature is 150～180 ℃.
4. the pre-sulfur method of a kind of high-sulfur bauxite according to claim 1, is characterized in that: desulfurization time is 4～6 hours.
5. the pre-sulfur method of a kind of high-sulfur bauxite according to claim 1, is characterized in that: concentration of sodium hydroxide solution is 100～200g/L.
6. the pre-sulfur method of a kind of high-sulfur bauxite according to claim 1, is characterized in that: the solution obtaining after desulfurization can recycle, improves the aluminium being used in stripping bauxite after concentration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310173092.9A CN104140122B (en) | 2013-05-10 | 2013-05-10 | A kind of pre-sulfur method of high-sulfur bauxite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310173092.9A CN104140122B (en) | 2013-05-10 | 2013-05-10 | A kind of pre-sulfur method of high-sulfur bauxite |
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| Publication Number | Publication Date |
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| CN104140122A true CN104140122A (en) | 2014-11-12 |
| CN104140122B CN104140122B (en) | 2016-02-24 |
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| CN201310173092.9A Expired - Fee Related CN104140122B (en) | 2013-05-10 | 2013-05-10 | A kind of pre-sulfur method of high-sulfur bauxite |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1565974A (en) * | 2003-06-24 | 2005-01-19 | 中国科学院过程工程研究所 | Normal pressure low temperature leaching production method for alumina |
| RU2360865C1 (en) * | 2007-12-03 | 2009-07-10 | Государственное образовательное учреждение высшего профессионального образования "Уральский государственный технический университет-УПИ" | Processing method of bauxites on alumina |
| CN101746795A (en) * | 2008-12-02 | 2010-06-23 | 中国科学院过程工程研究所 | Method for producing alumina from bauxite |
| CN102674415A (en) * | 2012-04-24 | 2012-09-19 | 中国铝业股份有限公司 | Sulphur removal method in aluminum oxide production by bauxite |
| CN102897812A (en) * | 2012-10-19 | 2013-01-30 | 北京化工大学 | Method for activating high-sulfur bauxite by means of low-temperature roasting desulfurization method |
| RU2478574C2 (en) * | 2007-07-12 | 2013-04-10 | Алюминум Корпорейшн Оф Чайна Лимитед | Method of producing aluminium oxide from medium- and low-grade bauxite |
-
2013
- 2013-05-10 CN CN201310173092.9A patent/CN104140122B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1565974A (en) * | 2003-06-24 | 2005-01-19 | 中国科学院过程工程研究所 | Normal pressure low temperature leaching production method for alumina |
| RU2478574C2 (en) * | 2007-07-12 | 2013-04-10 | Алюминум Корпорейшн Оф Чайна Лимитед | Method of producing aluminium oxide from medium- and low-grade bauxite |
| RU2360865C1 (en) * | 2007-12-03 | 2009-07-10 | Государственное образовательное учреждение высшего профессионального образования "Уральский государственный технический университет-УПИ" | Processing method of bauxites on alumina |
| CN101746795A (en) * | 2008-12-02 | 2010-06-23 | 中国科学院过程工程研究所 | Method for producing alumina from bauxite |
| CN102674415A (en) * | 2012-04-24 | 2012-09-19 | 中国铝业股份有限公司 | Sulphur removal method in aluminum oxide production by bauxite |
| CN102897812A (en) * | 2012-10-19 | 2013-01-30 | 北京化工大学 | Method for activating high-sulfur bauxite by means of low-temperature roasting desulfurization method |
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| CN104140122B (en) | 2016-02-24 |
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Granted publication date: 20160224 Termination date: 20200510 |