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Method for producing alumina by using high sulphur bauxite

A technology of high-sulfur bauxite and alumina, which is applied in the field of metallurgy, can solve the problems of high sulfur content, the inability to comprehensively utilize the residual alkali of alumina red mud, and the inability to carry out industrial application, so as to achieve high roasting efficiency and comprehensive energy utilization rate High, improve the effect of energy utilization

Active Publication Date: 2009-06-17
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For above technical problem, the present invention provides a kind of method utilizing high-sulfur bauxite to produce alumina, and its purpose is to solve the sulfur content of current high-sulfur diaspore type bauxite too high (greater than 2wt%), can't carry out Difficulties in industrial application, as well as difficulties in the production of alumina due to the high residual alkali in red mud that cannot be comprehensively utilized

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The sulfur content in the high-sulfur diaspore type bauxite used is 2.08%.

[0049] Grind 100g of bauxite ore until the particle size is less than 0.25mm, use SK2-4-12 fluidized bed for roasting and desulfurization pretreatment, and pass high-temperature air to heat the bauxite ore to 800°C for desulfurization and roasting, fluidization The number is 2, the roasting time is 10 minutes, and the sulfur content of the obtained roasted ore is 0.68wt%, which is lower than the requirement (0.7%) for the sulfur content of alumina industrial production in my country.

[0050] Among them, the high temperature air is made of Al(OH) 3 The high-temperature air generated by the waste heat of the calcination tail gas has a temperature of 1100-1300°C.

[0051] The roasted ore after roasting and desulfurization treatment is subjected to dissolution treatment by Bayer method, the dissolution temperature is 220°C, the dissolution time is 80min, caustic (Na 2 O) solution concentration is...

Embodiment 2

[0055] The high-sulfur diaspore type bauxite used is the same as in Example 1.

[0056] Grind 100g of bauxite ore until the particle size is below 0.164mm, use SK2-4-12 fluidized bed for roasting and desulfurization pretreatment, and pass high-temperature air to heat the bauxite ore to 850°C for desulfurization and roasting, fluidization The number is 2, the roasting time is 40min, and the sulfur content of the obtained roasted ore is 0.19wt%, which is lower than the requirement (0.7%) for the sulfur content of alumina industrial production in my country.

[0057] Among them, the high temperature air is made of Al(OH) 3 The high-temperature air generated by the waste heat of the calcination tail gas has a temperature of 1100-1300°C.

[0058] The roasted ore after roasting and desulfurization treatment is subjected to dissolution treatment by Bayer method, the dissolution temperature is 240°C, the dissolution time is 60min, caustic (Na 2 O) solution concentration is 240g / L, an...

Embodiment 3

[0062] The high-sulfur diaspore type bauxite used is the same as in Example 1.

[0063] Grind 100g of bauxite ore until the particle size is below 0.25mm, use SK2-4-12 fluidized bed for roasting and desulfurization pretreatment, and pass high-temperature air to heat the bauxite ore to 750°C for desulfurization and roasting, fluidization The number is 2, the roasting time is 90min, and the sulfur content of the obtained roasted ore is 0.65wt%, which is lower than the requirement (0.7%) for the sulfur content of alumina industrial production in my country.

[0064] Among them, the high temperature air is made of Al(OH) 3 The high-temperature air generated by the waste heat of the calcination tail gas has a temperature of 1100-1300°C.

[0065] The roasted ore after roasting and desulfurization treatment is subjected to dissolution treatment by Bayer method, the dissolution temperature is 200°C, the dissolution time is 90min, caustic (Na 2 O) solution concentration is 220g / L, and...

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Abstract

The invention relates to a method for producing alumina by utilization of high-aluminum alumyte, which belongs to the technical field of metallurgy. The method comprises: firstly, grinding alumyte ores, and adopting a fluidized bed to perform roasting and desulfurization pretreatment; secondly, treating obtained roasted ores by a Bayer process, and obtaining Al2O3 products after stripping, crystal seed decomposition and calcining treatment; and thirdly, introducing roasted tail gas generated by roasting into red mud under the stirring condition, and absorbing SO2 in the tail gas. The method has low stripping temperature, can effectively remove sulfur element in the ores, has great significance in developing and using the ores for alumina industrial production practice, uses the red mud during industrial production of alumina as an absorbent of the low concentration SO2 tail gas during roasting, and realizes dealkalization and modification treatment and comprehensive utilization of the red mud.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular to a method for producing alumina by using high-sulfur bauxite. Background technique [0002] At present, my country needs to consume more than 10 million tons of bauxite each year, most of which are high-quality ore ore. With the rapid development of the aluminum industry, the shortage of bauxite resources in my country, especially high-quality resources, has fully emerged. Many mines have shown a trend of depletion to varying degrees, especially the high-alumina mines in Henan and other places are on the verge of depletion. More than 80% of the basic reserves of bauxite resources in my country are medium and low-grade ore, and the average service life of high-grade high-quality bauxite is less than 10 years. If no new high-grade bauxite is discovered, proven and developed, the Bayer process system of my country's alumina plants will face a serious shortage of high-grade bauxit...

Claims

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Application Information

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IPC IPC(8): C01F7/02
Inventor 张廷安豆志河刘燕吕国志南相莉赵秋月蒋孝丽赫冀成
Owner NORTHEASTERN UNIV
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