Method for producing alumina by use of high sulfur bauxite

A high-sulfur bauxite and alumina technology, applied in the direction of alumina/hydroxide, etc., to achieve good effect, high dissolution rate, and realize the effect of recycling

Inactive Publication Date: 2014-06-04
GUIZHOU UNIV
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Problems solved by technology

[0006] Aiming at the problems existing in the current roasting method for treating high-sulfur bauxite, the present invention proposes a new method for processing high-sulfur bauxite to produce alumina by pre-roasting desulfurization method. The broken high-sulfur bauxite is coarsely ground, and after After roasting, the Bayer method is used to produce alumina directly, which avoids the dust pollution caused by the fine particle size of the ore, reduces the energy consumption of the fine grinding process, and eliminates the influence of sulfur in the ore on the production equipment and the organic matter in the ore on the production process. Adverse effects of

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  • Method for producing alumina by use of high sulfur bauxite

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Effect test

Embodiment 1

[0026] Change the composition to Al 2 o 3 64.28%, S T 1.415%, high-sulfur bauxite with A / S of 7.38 is coarsely ground to 20 mesh, accounting for 70%, take 50g and place it in a muffler furnace for desulfurization and roasting with 200ml / min of compressed air, roasting temperature 700°C, roasting time After 20 minutes, the sulfur content of the ore decreased to 0.47% after roasting, the desulfurization rate was 66.8%, and the particle size of the ore after roasting was 20 mesh, accounting for 80%.

[0027] The roasted ore was directly dissolved by the Bayer method. Under the dissolution conditions of temperature 260°C, time 60 minutes, caustic concentration 245g / L, and lime addition 6%, the relative dissolution rate of alumina reached 94.2%. The dissolution rate of 18.1%.

[0028] The roasted ore is ball milled to 200 mesh, accounting for 70% to 80%, and Bayer dissolution is carried out under the above conditions. The relative dissolution rate of alumina is 90.3%, and the di...

Embodiment 2

[0030] Change the composition to Al 2 o 3 65.08%, S T 2.329%, high-sulfur bauxite with A / S of 7.49 is coarsely ground to 20 mesh, accounting for 70%, take 50g and place it in a muffler furnace for desulfurization and roasting with 200ml / min of compressed air, the roasting temperature is 700°C, and the roasting time is After 20 minutes, the sulfur content of the ore decreased to 0.31% after roasting, the desulfurization rate was 95.7%, and the particle size of the ore after roasting was 20 mesh, accounting for 83%.

[0031] The roasted ore was directly dissolved by the Bayer method. Under the dissolution conditions of temperature 260°C, time 60 minutes, caustic concentration 245g / L, and lime addition 6%, the relative dissolution rate of alumina reached 95.1%. The dissolution rate of 14.3%.

[0032] The roasted ore is ball milled to 200 mesh, accounting for 70% to 80%, and the Bayer dissolution is carried out under the above conditions. The relative dissolution rate of alumin...

Embodiment 3

[0034] Change the composition to Al 2 o 3 66.5%, S T 2.331%, high-sulfur bauxite with A / S of 6.88 is coarsely ground to 20 mesh, accounting for 70%, take 50g and place it in a muffler furnace for roasting and desulfurization, feed 200ml / min of compressed air, roasting temperature 700°C, roasting time After 20 minutes, the sulfur content of the ore decreased to 0.48% after roasting, the desulfurization rate was 79.4%, and the particle size of the ore after roasting was 20 mesh, accounting for 81%.

[0035] The roasted ore was directly dissolved by the Bayer method. Under the conditions of dissolution at a temperature of 260°C, a time of 60 minutes, a caustic concentration of 245g / L, and a lime addition of 6%, the relative dissolution rate of alumina reached 94.8%. The dissolution rate of 16.3%.

[0036] The roasted ore is ball milled to 200 mesh, accounting for 70% to 80%, and Bayer dissolution is carried out under the above conditions. The relative dissolution rate of alumi...

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Abstract

The invention discloses a method for producing alumina by use of high sulfur bauxite, and the method comprises the following steps: carrying out coarse grinding on crushed high sulfur bauxite, roasting the crushed high sulfur bauxite to enable the sulfur content of the ore to be smaller than 0.7%, and then, directly entering an alumina production flow by use of a Bayer process. After the pre-roasting treatment, the leaching performance of the ore is perfected, a better leaching effect can be obtained without fine grinding, and the energy consumption in a fine grinding process of the ore is reduced, so that the method is beneficial to equipment selection in the roasting process and suitable for treating the high sulfur bauxite. The ore in the invention is roasted at a rough particle size, thus helping the overflow of the generated SO2 (or SO3) gas and ensuring a good roasting desulfurization effect; in addition, by adopting the method disclosed by the invention, the energy consumption in the fine grinding process of the ore is reduced, the over burning and dust pollution problems caused by superfine particle size are avoided, the cyclic utilization of energy source is achieved and the desulfurization cost is reduced.

Description

technical field [0001] The invention relates to the technical field of producing alumina by the Bayer method, in particular to a method for producing alumina by using high-sulfur bauxite. Background technique [0002] In view of the current situation that my country's demand for bauxite has increased significantly and reserves of high-grade bauxite have been decreasing day by day, it is very necessary to speed up the development and improvement of the technology for producing alumina from high-sulfur bauxite. [0003] my country's diaspore high-sulfur bauxite reserves are more than 560 million tons. Usually, when the sulfur content in the ore is greater than 0.7%, it is called high-sulfur bauxite, and the sulfur in the ore exists in the form of pyrite. The high-sulfur bauxite currently mined is mainly medium-high aluminum, medium-low silicon, high-sulfur, and medium-high aluminum-silicon ratio. The average aluminum-silicon ratio is about 7, the sulfur content is as high as 4...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02
Inventor 陈朝轶李军旗王家伟赵平源全变利吕莹璐
Owner GUIZHOU UNIV
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