CN104140119A - Method for low temperature desulphurization of sodium aluminate solution - Google Patents
Method for low temperature desulphurization of sodium aluminate solution Download PDFInfo
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- CN104140119A CN104140119A CN201310172901.4A CN201310172901A CN104140119A CN 104140119 A CN104140119 A CN 104140119A CN 201310172901 A CN201310172901 A CN 201310172901A CN 104140119 A CN104140119 A CN 104140119A
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- sodium aluminate
- aluminate solution
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Abstract
A method for low temperature desulphurization of a sodium aluminate solution is characterized in that low temperature oxidation desulphurization of the sodium aluminate solution which is a slurry obtained after high temperature dissolve-out of high sulfur bauxite through introducing oxygen in order to remove S<2-> in the sodium aluminate solution. A low temperature oxidation technology is adopted to oxidize the dissolve-out slurry of the high sulfur bauxite, so S<2-> in the sodium aluminate solution can be removed, and the desulfurization rate reaches above 90%. The method has the advantages of low operation temperature, good desulphurization effect, low energy consumption and the like.
Description
Technical field
A method for sodium aluminate solution low-temp desulfurization, the particularly method of the slip-sodium aluminate solution low-temp desulfurization after the stripping of a kind of high-sulfur bauxite high temperature.Belong 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, S in solution
2-excessive concentration raises iron level in alumina product, quality product degradation.In addition, in bauxite, excessive alkaline consumption, etching apparatus, the pollution sodium aluminate solution of also can increasing of sulphur, causes great harm to production process.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 method of sodium aluminate solution low-temp desulfurization, and its object is to solve the difficult problem that high-sulfur bauxite cannot industrial applications.
The object of the invention is to be achieved through the following technical solutions: high-sulfur bauxite, after high temperature stripping, at lower temperature (105～160 ° of C), passes into oxygen in slip, and stripping slurry is oxidized to remove the S in sodium aluminate solution
2-.
The method of above-mentioned sodium aluminate solution low-temp desulfurization, sodium aluminate solution refers to the stripping slurry of high-sulfur bauxite.
The method of above-mentioned sodium aluminate solution low-temp desulfurization, desulfurization time is 1～3h.
The method of above-mentioned sodium aluminate solution low-temp desulfurization, logical oxygen also can adopt the mode that blasts air.
The method of above-mentioned sodium aluminate solution low-temp desulfurization, temperature is 105～160 ° of C.
The method of above-mentioned sodium aluminate solution low-temp desulfurization, can be connected mutually with Bayer process process for making alumina.
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, has saved energy consumption; S
2-removal effect is good.
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 high-sulfur bauxite that somewhere, the Henan sulphur content of take is 4.65% is tested as raw material, by 80g ore deposit, 400mL concentration, is 250g/L (Na
2o meter) sodium hydroxide solution, 4g CaO are placed in the stripping of autoclave high temperature after 2 hours, S in the sodium aluminate solution obtaining
2-content is 2.18g/L.
Embodiment 1:
By 80g high-sulfur bauxite, 400mL concentration, be 250g/L (Na
2o meter) sodium hydroxide solution, 4g CaO are placed in autoclave, sealing, heated and stirred.When temperature reaches 230 ° of C, start timing, stripping, after 2 hours, starts cooling, when temperature is down to 105 ° of C, passes into oxygen.React after 3 hours, go out still, filter.S in the sodium aluminate solution obtaining
2-content is 0.20g/L, and desulfurization degree is 90.83%.
Embodiment 2:
By 80g high-sulfur bauxite, 400mL concentration, be 250g/L (Na
2o meter) sodium hydroxide solution, 4g CaO are placed in autoclave, sealing, heated and stirred.When temperature reaches 230 ° of C, start timing, stripping, after 2 hours, starts cooling, when temperature is down to 140 ° of C, passes into oxygen.React after 3 hours, go out still, filter.S in the sodium aluminate solution obtaining
2-content is 0.17g/L, and desulfurization degree is 92.90%.
Embodiment 3:
By 80g high-sulfur bauxite, 400mL concentration, be 250g/L (Na
2o meter) sodium hydroxide solution, 4g CaO are placed in autoclave, sealing, heated and stirred.When temperature reaches 230 ° of C, start timing, stripping, after 2 hours, starts cooling, when temperature is down to 150 ° of C, passes into oxygen.React after 3 hours, go out still, filter.S in the sodium aluminate solution obtaining
2-content is 0.11g/L, and desulfurization degree is 94.95%.
Embodiment 4:
By 80g high-sulfur bauxite, 400mL concentration, be 250g/L (Na
2o meter) sodium hydroxide solution, 4g CaO are placed in autoclave, sealing, heated and stirred.When temperature reaches 230 ° of C, start timing, stripping, after 2 hours, starts cooling, when temperature is down to 160 ° of C, passes into oxygen.React after 3 hours, go out still, filter.S in the sodium aluminate solution obtaining
2-content is 0.08g/L, and desulfurization degree is 96.33%.
Embodiment 5:
By 80g high-sulfur bauxite, 400mL concentration, be 250g/L (Na
2o meter) sodium hydroxide solution, 4g CaO are placed in autoclave, sealing, heated and stirred.When temperature reaches 230 ° of C, start timing, stripping, after 2 hours, starts cooling, when temperature is down to 160 ° of C, passes into oxygen.React after 2 hours, go out still, filter.S in the sodium aluminate solution obtaining
2-content is 0.09g/L, and desulfurization degree is 95.87%.
Claims (6)
1. a method for sodium aluminate solution low-temp desulfurization, is characterized in that: adopt the mode that passes into oxygen, the slip-sodium aluminate solution after the stripping of high-sulfur bauxite high temperature is carried out to low-temperature oxidation desulfurization.
2. the method for a kind of sodium aluminate solution low-temp desulfurization according to claim 1, is characterized in that: sodium aluminate solution is the stripping slurry after the stripping of high-sulfur bauxite high temperature.
3. the method for a kind of sodium aluminate solution low-temp desulfurization according to claim 1, is characterized in that: desulfurization temperature is 105～160 ℃.
4. the method for a kind of sodium aluminate solution low-temp desulfurization according to claim 1, is characterized in that: desulfurization time is 1-3 hour.
5. the method for a kind of sodium aluminate solution low-temp desulfurization according to claim 1, is characterized in that: logical oxygen can adopt the mode that blasts air.
6. the method for a kind of sodium aluminate solution low-temp desulfurization according to claim 1, is characterized in that: can be connected mutually with Bayer process process for making alumina.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310172901.4A CN104140119A (en) | 2013-05-10 | 2013-05-10 | Method for low temperature desulphurization of sodium aluminate solution |
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| CN201310172901.4A CN104140119A (en) | 2013-05-10 | 2013-05-10 | Method for low temperature desulphurization of sodium aluminate solution |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101597075A (en) * | 2008-06-06 | 2009-12-09 | 中国铝业股份有限公司 | A kind of method of direct desulfurization in alumina production |
| 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 |
| CN102718237A (en) * | 2012-06-21 | 2012-10-10 | 中国铝业股份有限公司 | Method for preparing alumina through bauxite containing sulphur |
-
2013
- 2013-05-10 CN CN201310172901.4A patent/CN104140119A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101597075A (en) * | 2008-06-06 | 2009-12-09 | 中国铝业股份有限公司 | A kind of method of direct desulfurization in alumina production |
| 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 |
| CN102718237A (en) * | 2012-06-21 | 2012-10-10 | 中国铝业股份有限公司 | Method for preparing alumina through bauxite containing sulphur |
Non-Patent Citations (1)
| Title |
|---|
| 胡小莲等: ""采用湿式氧化法脱除铝酸钠溶液中硫的研究"", 《中南大学学报(自然科学版)》 * |
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Application publication date: 20141112 |