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Desulfurization method for aluminium oxide production based on high-sulfur bauxite

A high-sulfur bauxite and alumina technology, which is applied in the fields of environmental protection and metallurgy, can solve problems such as low desulfurization rate, safety risks, and increase the roasting process, so as to achieve high sulfur removal efficiency and eliminate serious safety hazards.

Inactive Publication Date: 2018-05-04
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The desulfurization of raw meal coal combustion is limited to the sintering method or the combined method of alumina production, and the desulfurization effect is poor; the investment and cost of flotation desulfurization equipment are large, and it needs to be carried out simultaneously with flotation desiliconization; ore roasting The desulfurization method needs to increase the roasting process, the investment is large, the cost is high, and the desulfurization rate is low; the desulfurization efficiency is high by adding a precipitant, but only one form of sulfur in the solution can be removed; the wet oxidation desulfurization A certain amount of hydrogen will be produced during the process, which poses a safety risk. At the same time, the causticization process of salt discharge will be added, which will increase the production cost
Due to the lack of proper sulfur removal methods, a large amount of high-sulfur bauxite cannot be fully developed and utilized

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The sulfur removal method for producing alumina from high-sulfur bauxite, the slurry in the pre-desilication tank during the production of alumina from high-sulfur bauxite (with a sulfur content of 1.02wt%) is pre-desilicated at a temperature of 90°C Silicon reaction for 8 hours, add reducing agent during pre-desiliconization, and dissolve at 260°C for 1 hour after pre-desiliconization, wherein the reducing agent is iron, and the amount of reducing agent added is 4g / L; the reducing agent is used to suppress the S 2- Oxidized to S 2 o 3 2- , SO 3 2- , SO 4 2- , and make most of the sulfur into the red mud, so that the S in the solution 2- , S 2 o 3 2- , SO 3 2- , SO 4 2- And the content of total sulfur is greatly reduced, and finally the purpose of sulfur removal in sodium aluminate solution is achieved.

[0015] Compared with the blank experiment (no iron added, other steps and parameters are the same), the total sulfur in the sodium aluminate solution in...

Embodiment 2

[0017] The sulfur removal method for producing alumina from high-sulfur bauxite, high-sulfur bauxite (with a sulfur content of 1.02wt%) is dissolved at 260°C, and the stripping slurry is diluted to N in a stripping slurry dilution tank k to 160g / L, add a reducing agent, and react at a temperature of 90°C for 15 hours, wherein the reducing agent is activated carbon, and the amount of the reducing agent added is 0.5g / L; the reducing agent is used to suppress the S that enters the solution 2- Oxidized to S 2 o 3 2- , SO 3 2- , SO 4 2- , and make most of the sulfur into the red mud, so that the S in the solution 2- , S 2 o 3 2- , SO 3 2- , SO 4 2- And the content of total sulfur is greatly reduced, and finally the purpose of sulfur removal in sodium aluminate solution is achieved.

[0018] Compared with the blank experiment (no reducing agent was added, other steps and parameters were the same), the total sulfur in the sodium aluminate solution in this embodiment was...

Embodiment 3

[0020] The sulfur removal method for producing alumina from high-sulfur bauxite, high-sulfur bauxite (with a sulfur content of 1.02wt%) is dissolved at 260°C, and the stripping slurry is diluted to N in a stripping slurry dilution tank k to 160g / L, add a reducing agent, and react at a temperature of 110°C for 12 hours, wherein the reducing agent is aluminum, and the amount of the reducing agent added is 20g / L; the reducing agent is used to suppress the S that enters the solution 2- Oxidized to S 2 o 3 2- , SO 3 2- , SO 4 2- , and make most of the sulfur into the red mud, so that the S in the solution 2- , S 2 o 3 2- , SO 3 2- , SO 4 2- And the content of total sulfur is greatly reduced, and finally the purpose of sulfur removal in sodium aluminate solution is achieved.

[0021] Compared with the blank experiment (no reducing agent was added, other steps and parameters were the same), the total sulfur in the sodium aluminate solution in this embodiment was reduced...

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Abstract

The invention relates to a desulfurization method for aluminium oxide production based on high-sulfur bauxite and belongs to the technical field of environmental protection and metallurgy. A reducingagent is added to slurry in a process of aluminium oxide production based on high-sulfur bauxite for desulfurization, wherein the reducing agent is one or a mixture of activated carbon, aluminium, iron and zinc in any ratio. According to the method, variable-valence sulfur such as S<2->, S2O3<2->, SO3<2-> and SO4<2-> in various forms in a solution can be removed, and desulfurization efficiency ishigh; meanwhile, the defect of severe potential safety hazard possibly caused by corrosion of sulfur to a heater wall can be overcome.

Description

technical field [0001] The invention relates to a sulfur removal method for producing alumina from high-sulfur bauxite, which belongs to the technical fields of environmental protection and metallurgy. Background technique [0002] The main sulfide minerals in high-sulfur bauxite are pyrite (FeS 2 ) and its isomers marcasite and colloidite and gypsum CaSO 4 A class of sulfates. In the Bayer process of alumina production, sulfur is first converted to S 2- into the solution and is gradually oxidized into various forms of sulfur, such as SO 3 2- , S 2 o 3 2- and SO 4 2- Wait. In the process of alumina production, when the sulfur content reaches a certain level, it will bring great harm to the production, and even make the production impossible. [0003] At present, the sulfur removal methods in the process of using high-sulfur bauxite to produce alumina at home and abroad mainly include: raw meal adding coal to burn sulfur, flotation sulfur removal, ore roasting meth...

Claims

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Application Information

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IPC IPC(8): C01F7/47C01F7/02
CPCC01F7/02C01F7/47
Inventor 刘战伟马文会颜恒维谢克强吕国强于洁李绍元雷云伍继君魏奎先秦博陈正杰
Owner KUNMING UNIV OF SCI & TECH
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