CN102534189A - Desulphurization treatment method of high-sulfur bauxite - Google Patents
Desulphurization treatment method of high-sulfur bauxite Download PDFInfo
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- CN102534189A CN102534189A CN2011103600418A CN201110360041A CN102534189A CN 102534189 A CN102534189 A CN 102534189A CN 2011103600418 A CN2011103600418 A CN 2011103600418A CN 201110360041 A CN201110360041 A CN 201110360041A CN 102534189 A CN102534189 A CN 102534189A
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- roasting
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- bauxite
- sulfur bauxite
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Abstract
The invention discloses a desulphurization treatment method of high-sulfur bauxite. According to the method, the high-sulfur bauxite is taken, and the high-sulfur bauxite is roasted for more than 1 minute at a temperature higher than 400 DEG C in a microwave heating roasting mode. Compared with the existing conventional roasting desulphurization technology, the desulphurization treatment method has the advantages that the microwave heating roasting desulphurization effect of the high-sulfur bauxite is good, the roasting temperature is lower, the roasting time is shorter, the smelting desulphurization process is simplified, and the energy consumption is reduced, so the production cost is further reduced, the microwave desulphurization can only be carried out on bauxite with higher sulfur content, then, the ore blending is carried out, the sulfur content of the ore is lower than 0.7 percent in the production control line, and the desulphurization treatment method is applied in industrial production.
Description
Technical field
The present invention relates to the alumyte desulfuration technical field, particularly relate to a kind of desulfuration processing method of high-sulfur bauxite.
Background technology
China's bauxite resource reserves are abundant, surveyed bright reserves to 2008 and have been reached for 32.23 hundred million tons, and wherein, 1.5 hundred million tons of diaspore high-sulfur type bauxite reserves account for 11.0% of total reserves.To the increasing of resource exploration dynamics, the bright reserves of surveying of high-sulfur bauxite are also increasing along with in recent years.
Alumina silica ratio can be used for alumina producing Bayer process, but the sulfur impurity in the high-sulfur bauxite can produce certain influence to Production Flow Chart greater than 7 part in the high-sulfur bauxite.Sulphur in the high-sulfur bauxite mainly exists with the pyrite form; Pyrite can be prior to the aluminum oxide stripping under the high pressure leaching condition; Will make the most of sulphur in the high-sulfur bauxite get in the solution and constantly accumulation aborning like this; The a series of harmful effects of sulphur have been caused thus: at first to the aluminum oxide flow process; Sulfothiorine in the sodium aluminate solution makes the metallic iron oxidation, and oxidation products gets into sodium aluminate solution with the sulfur-bearing title complex that the Sulfothiorine reaction forms solubility, a part of Fe (OH) that reaction generates
2With Na
2The S reaction generates hydroxyl Sulfothiorine Na
2[FeS
2(OH)
2] H
2O gets into solution, the content of the ironic hydroxide in the solution is increased, thereby the viscosity of solution increases, and red mud separation and sedimentation operation can not be carried out smoothly; Secondly, production practice prove, be dissolved in sulphur in the sodium aluminate solution with forms such as sulfonium ion, hydroxyl sulfonium ion and title complexs heat exchanger tube and the corrosion speed of filter screen cloth in steel equipment, the particularly vaporizer are accelerated; Once more, also will cause vaporizer heating tube and discharge system to produce fouling even plugging, reduce steam capability, make seed precipitation solution evaporating concentration process difficulty, reduce the solubility rate of Bayer process aluminum oxide; At last, the continuous accumulation meeting of sulphur has brought very big harm to production, even whole process of production can't be carried out.
Low-grade high-sulfur bauxite can be used for sintering process and produces aluminum oxide, but the sulfur impurity in the high-sulfur bauxite can produce certain influence to the sintering flow process.In sintering process, sulfide in furnace charge and the fuel and vitriol all will become sodium sulfate with alkali reaction, and per kilogram sulphur will consume 3.4kg yellow soda ash.The accumulation because sodium sulfate circulates on stream, its content in grog can be up to more than 10%.Facts have proved that the sodium sulphate content of grog surpasses 4%, the operation of rotary kiln just exceptional hardship can occur; Just certain plasticity-occurs after sodium sulphate content reaches 8% in grog, generate at the sintering zone rear portion easily " back ring formation ".Sodium sulfate is unfavorable to mother liquid evaporation, and simultaneously, sodium sulfate increases mass flow as a kind of unnecessary material, causes the production capacity reduction of kiln and the unnecessary consumption of fuel.
At present the method for the desulfurization of high-sulfur bauxite mainly is divided into preroasting desulfurization, floatation desulphurization, raw material and adds several types of coal desulfurization and wet desulphurizations etc.Floatation desulphurization research at present exists medicament and moisture aluminum oxide flow process, and fine mineral worsens problems such as settling property.The wet desulphurization method plays Water purification to sodium aluminate solution, and desulfurization effect, but still can't avoid element sulphur some harm in process in leaching in the high-sulfur bauxite is as to the corrosion on Equipment effect.The bauxite desulfurization with roasting technique can not only reduce sulphur content in the ore, and the dissolving out capability of ore is significantly increased after the roasting pre-treatment, but has the not high problem of desulfuration efficiency.
Summary of the invention
Technical problem to be solved by this invention is to overcome the not high defective of desulfuration efficiency in the existing desulfurization with roasting technique method, and a kind of desulfuration processing method of high-sulfur bauxite is provided, and desulfurization effect, maturing temperature is low, roasting time is short.
In order to solve the problems of the technologies described above, the present invention adopts following technical scheme:
The desulfuration processing method of high-sulfur bauxite of the present invention: get high-sulfur bauxite, adopt microwave heating roasting mode more than roasting 1min more than 400 ℃.
Preferably, in the desulfuration processing method of above-mentioned high-sulfur bauxite, high-sulfur bauxite is pulverized earlier before the microwave heating roasting, and 200 mesh sieves are crossed in 70～90% ore deposit.Can also before the microwave heating roasting, in conventional heating installation, be preheated to 300～500 ℃ earlier, the existing industrial production flow process of following that like this can be convenient combines.
In technique scheme, maturing temperature is high more, roasting time is long more, and then sweetening effectiveness is good more, and is unqualified to the sulphur content of bauxite.
Microwave heating roasting desulfurization and the conventional contrast that adds thermal bake-out:
Microwave heating roasting: take by weighing the 50g sulphur content and be 1.367% high-sulfur bauxite sample in the 200ml porcelain crucible; At microwave power is to heat under 1～7kw condition; Temperature reaches 550 ℃, and adjustment power makes homo(io)thermism, adds to stop heating behind the thermal bake-out 5min; Sample sulphur content after the roasting is 0.38%, and desulfurization degree is 76.44%.The XRD figure spectrum is as shown in Figure 1.
Routine adds thermal bake-out: with sulphur content be 1.367% high-sulfur bauxite sample 600 ℃, 700 ℃ and 800 ℃ of roastings in retort furnace, the roasting result is as shown in Figure 2.
From Fig. 1 and Fig. 2, the microwave heating roasting is similar with the XRD figure spectrum that routine adds thermal bake-out, Fe all occurred
2O
3Diffraction peak, this mainly is FeS
2Product after the oxidizing roasting, the product that two kinds of desulfurization methods are described is consistent.
With existing conventional desulfurization with roasting technique compared with techniques, high-sulfur bauxite microwave heating roasting desulfurization effect, maturing temperature is lower, roasting time is shorter; Simplified the smelting sulfur removal technology, practiced thrift energy consumption, thereby further reduced production costs; Can only carry out microwave desulfurization to the higher bauxite of sulfur-bearing; Join the ore deposit again, make the sulphur content in ore deposit be lower than 0.7% production control line, be applied to industrial production.
Description of drawings
Fig. 1 is the XRD figure spectrum after high-sulfur bauxite, conventional desulfurization and the microwave calcining desulfurization;
Fig. 2 is conventional type of heating desulfurization with roasting technique result.
Embodiment
Embodiment 1: take by weighing the 50g sulphur content and be 1.367% high-sulfur bauxite sample in the 200ml porcelain crucible; At microwave power is to heat under 1～7kw condition; Temperature reaches 400 ℃, and adjustment power makes homo(io)thermism, adds to stop heating behind the thermal bake-out 2min; Sulphur content after the sample roasting is 0.69% (＜0.7%), and desulfurization degree is 56.2%.
Embodiment 2: take by weighing the 50g sulphur content and be 1.367% high-sulfur bauxite sample in the 200ml porcelain crucible; At microwave power is to heat under 1～7kw condition; Temperature reaches 550 ℃, and adjustment power makes homo(io)thermism, adds to stop heating behind the thermal bake-out 2min; Sulphur content after the sample roasting is 0.526%, and desulfurization degree is 66.53%.
Embodiment 3: take by weighing the 50g sulphur content and be 1.367% high-sulfur bauxite sample in the 200ml porcelain crucible; At microwave power is to heat under 1～7kw condition; Temperature reaches 600 ℃, and adjustment power makes homo(io)thermism, adds to stop heating behind the thermal bake-out 2min; Sulphur content after the sample roasting is 0.47%, and desulfurization degree is 70.2%.
Embodiment 4: take by weighing the 50g sulphur content and be 5.22% high-sulfur bauxite sample in the 200ml porcelain crucible; At microwave power is to heat under 1～7kw condition; Temperature reaches 550 ℃, and adjustment power makes homo(io)thermism, stops heating behind the roasting 15min; Sample sulphur content after the roasting is 0.156%, and desulfurization degree is 97.54%.
Embodiment 5: take by weighing the 50g sulphur content and be 1.367% high-sulfur bauxite sample in the 200ml porcelain crucible; At microwave power is to heat under 1～7kw condition; Temperature reaches 550 ℃, and adjustment power makes homo(io)thermism, adds to stop heating behind the thermal bake-out 15min; Sulphur content after the sample roasting is 0.18%, and desulfurization degree is 88.72%.
Embodiment 6: take by weighing the 50g sulphur content and be 1.02% high-sulfur bauxite sample in the 200ml porcelain crucible; At microwave power is to heat under 1～7kw condition; Temperature reaches 550 ℃, and adjustment power makes homo(io)thermism, adds to stop heating behind the thermal bake-out 2min; Sulphur content after the sample roasting is 0.296%, and desulfurization degree is 74.07%.
Embodiment 7: take by weighing the 50g sulphur content and be 1.02% high-sulfur bauxite sample in the 200ml porcelain crucible; At microwave power is to heat under 1～7kw condition; Temperature reaches 550 ℃, and adjustment power makes homo(io)thermism, adds to stop heating behind the thermal bake-out 15min; Sulphur content after the sample roasting is 0.088%, and desulfurization degree is 92.74%.
Embodiment 8: take by weighing the 50g sulphur content and be 5.22% high-sulfur bauxite sample in the 200ml porcelain crucible; At microwave power is to heat under 1～7kw condition; Temperature reaches 550 ℃, and adjustment power makes homo(io)thermism, adds to stop heating behind the thermal bake-out 5min; Sulphur content after the sample roasting is 0.46%, and desulfurization degree is 92.76%.
Embodiment 9: take by weighing the 50g sulphur content and be 5.22% high-sulfur bauxite sample in the 200ml porcelain crucible; At microwave power is to heat under 1～7kw condition; Temperature reaches 550 ℃, and adjustment power makes homo(io)thermism, adds to stop heating behind the thermal bake-out 2min; Sulphur content after the sample roasting is 0.23%, and desulfurization degree is 95.6%.
Claims (3)
1. the desulfuration processing method of a high-sulfur bauxite is characterized in that: get high-sulfur bauxite, adopt microwave heating roasting mode more than roasting 1min more than 400 ℃.
2. according to the desulfuration processing method of the said high-sulfur bauxite of claim 1, it is characterized in that: high-sulfur bauxite is pulverized earlier before the microwave heating roasting, and 200 mesh sieves are crossed in 70～90% ore deposit.
3. according to the desulfuration processing method of the said high-sulfur bauxite of claim 1, it is characterized in that: before the microwave heating roasting, in conventional heating installation, be preheated to 300～500 ℃ earlier.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102815730A (en) * | 2012-08-07 | 2012-12-12 | 北京化工大学 | Method for oxidation desulfurization-magnetization iron-removal pretreatment on high-sulfur content bauxite |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101067164A (en) * | 2007-06-08 | 2007-11-07 | 东北大学 | Diaspore type bauxite low-temperature dissolving out method |
| CN101456572A (en) * | 2008-12-26 | 2009-06-17 | 东北大学 | Method for producing alumina by using high sulphur bauxite |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101067164A (en) * | 2007-06-08 | 2007-11-07 | 东北大学 | Diaspore type bauxite low-temperature dissolving out method |
| CN101456572A (en) * | 2008-12-26 | 2009-06-17 | 东北大学 | Method for producing alumina by using high sulphur bauxite |
Non-Patent Citations (1)
| Title |
|---|
| 梁佰站等: "高硫铝土矿微波脱硫溶出试验", 《有色金属（冶炼部分）》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102815730A (en) * | 2012-08-07 | 2012-12-12 | 北京化工大学 | Method for oxidation desulfurization-magnetization iron-removal pretreatment on high-sulfur content bauxite |
| CN102815730B (en) * | 2012-08-07 | 2016-08-24 | 北京化工大学 | Oxidation sweetening-the magnetization of a kind of high-sulfur bauxite removes ferrum preprocess method |
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Application publication date: 20120704 |