Low-silicon gibbsite ore treatment process

Abstract

The invention relates to a low-silicon gibbsite treatment process. The process comprises the following steps: 1) drying, 2) crushing and screening, (3) magnetizing roasting, (4) ball-milling burdening, (5) high-temperature and high-pressure dissolution, (6) dilution, (7) separation, (8) fine filtration and high-refined-liquid-concentration one-stage decomposition, (9) washing and (10) physical magnetic separation. The technology for processing the low-silicon gibbsite ores by adopting ore magnetizing roasting, high-temperature dissolution and high-concentration one-stage decomposition has theobvious advantages of high ore dissolution rate, good red mud sedimentation performance, low comprehensive energy consumption and low cost.

Description

technical field [0001] The invention belongs to the technical field of aluminum ore smelting, and in particular relates to a low-silicon gibbsite ore treatment process. Background technique [0002] my country's bauxite resources are gradually exhausted, and the amount of bauxite imported by the domestic alumina industry is increasing day by day. Among the imported bauxite, Guinea bauxite accounts for about 50%, and its annual import volume still shows an upward trend; Guinea bauxite belongs to low-silicon gibbsite ore, and the silicon oxide content in the ore is basically 3 % or less; the alumina content in the ore is 45%~48%, the crystal form is mainly gibbsite, the crystal water is about 23%, and there are about 15% of gibbsite and a small amount of boehmite; The content of iron oxide in the ore is 20%-23%, the content of organic matter is about 0.14%, and the water attached to the ore is about 10%. [0003] At present, the main production process for processing Guinea ...

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Problems solved by technology

[0005] (1) The relative dissolution rate of alumina in ore is generally low, and cannot exceed 88%

This is because the low-temperature dissolution temperature is too low to cause the dissolution reaction of aluminum goethite and boehmite in the ore, so the dissolution rate of alumina in the ore is low

[0006] (2) The sedimentation performance of the dissolved red mud is poor, and the number of washings is more, generally 6 washings are used

This is because the aluminum goethite in the ore has not undergone a dissolution reaction, the crystal form has not changed, and it is still aluminum goethite in the red mud, resulting in poor red mud sedimentation performance.

[0007] (3) The iron concentrate grade and iron recovery rate obtained by low-temperature dissolution red mud iron separation are low, the iron concentrate grade is about 45%-48%, and the iron recovery rate is less than 33%

[0008] (4) The low semen concentration two-stage decomposition process has the disadvantages of large material flow, complicated process and high energy consumption

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