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Dissolution method of monohydrate bauxite ore

A technology of bauxite and gibbsite, applied in the field of metallurgy, can solve the problems of high cost of additives, achieve the effect of reducing burden, reducing losses and eliminating adverse effects

Active Publication Date: 2013-03-20
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method is economical compared to the traditional dissolution method of adding lime, it still has the problem of relatively high additive cost. In order to further reduce production costs, it is necessary to study new additives

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The diaspore type bauxite (composition: Al 2 o 3 56.63%, SiO 2 9.85%, Fe 2 o 3 18.56%, TiO 2 2.36%), circulating mother liquor (100mL) and methanol to prepare raw ore slurry. The circulating mother liquor is composed of: Na 2 o k 220.34g / L, Al 2 o 3 120.58g / L; based on the volume of circulating mother liquor, the amount of ore blending is 255g / L, and the amount of methanol added is 2g / L. The prepared raw ore pulp is subjected to high-pressure stripping, and the stripping conditions are as follows: the temperature is 260° C., and the time is 60 minutes. Under these conditions, the actual dissolution rate of alumina was 80.06%, and the mass of the dissolution residue was 13.46g. In the comparative experiment, no methanol was added, 12% lime of dry ore was added, and other conditions were the same, the actual dissolution rate of alumina was 77.78%, and the mass of leached slag was 18.58g. The dissolution slag with methanol and lime added above was subjected...

Embodiment 2

[0016] The diaspore type bauxite (composition: Al 2 o 3 65.08%, SiO 2 6.57%, Fe 2 o 3 10.46%, TiO 2 3.26%) and circulating mother liquor (100mL) to prepare raw ore pulp. The composition of the circulating mother liquor is the same as in Example 1; the volume of the circulating mother liquor is 200g / L. The prepared raw ore pulp is subjected to high-pressure stripping. During stripping, 0.2 g / L of glycerol is added according to the volume of the circulating mother liquor. The stripping temperature is 280° C. and the stripping time is 30 minutes. Under these conditions, the actual dissolution rate of alumina is 88.30%, and the mass of the dissolution residue is 8.04g. While in the comparative experiment, without adding glycerin, adding 10% lime of dry ore, and other conditions are the same, the actual dissolution rate of alumina is 87.5%, and the mass of dissolved slag is 11.85g.

Embodiment 3

[0018] The diaspore type bauxite (the ore composition is the same as in Example 1), circulating mother liquor (100 mL) and glucose were prepared into raw ore slurry. The circulating mother liquor is composed of: Na 2 o k 260.47g / L, Al 2 o 3 142.32g / L; based on the volume of circulating mother liquor, the amount of ore blending is 350g / L, and the amount of glucose added is 2.5g / L. The prepared raw ore pulp is subjected to high-pressure stripping, and the stripping conditions are as follows: the temperature is 260° C., and the time is 45 minutes. Under these conditions, the actual dissolution rate of alumina was 78.92%, and the quality of the dissolution residue was 18.68g. In the comparative experiment, without adding glycerin, adding 12% lime of dry ore, and other conditions are the same, the actual dissolution rate of alumina is 76.28%, and the mass of dissolved slag is 25.18g.

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Abstract

The invention discloses a dissolution method of monohydrate bauxite ore. An organic additive or a carbon additive is added to a bauxite dissolution system, and therefore, inhibition of a titanium mineral on the dissolving process of aluminum oxide is solved. Compared with the existing dissolution method of adding lime in the aluminum oxide industry, with the adoption of the dissolution method disclosed by the invention, the loss of the aluminum oxide can be reduced; the amount of discharged red mud is reduced by about 30%; and the burden of a dissolved ore slurry separating and washing system is reduced, and meanwhile, enrichment of iron mineral is facilitated and the iron mineral is transformed into easy-to-separate magnetic iron component.

Description

technical field [0001] The invention relates to a method for dissolving gibbsite-type bauxite, which belongs to the technical field of metallurgy. Background technique [0002] Bauxite usually contains 2 to 4% titanium minerals, mainly rutile, anatase and brookite. During the high-temperature dissolution process of gibbsite-type bauxite, due to the blocking effect of titanium minerals on the dissolution of alumina, it is generally necessary to add lime to eliminate its harm in industry. However, the addition of lime brings problems such as increased alumina loss, increased red mud and washing water volume, and increased carbonate causticization to alumina production. [0003] In order to avoid the adverse effect of adding lime on alumina production, we proposed to use iron powder or ether cellulose to eliminate titanium Mineral-influenced dissolution methods. Although this method is economical compared to the traditional lime-adding dissolution method, it still has the pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02
Inventor 李小斌周秋生刘楠余顺文彭志宏刘桂华齐天贵张玉通
Owner CENT SOUTH UNIV
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