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Method for removing sulfur and organic matters in bauxite

A technology of bauxite and organic matter, applied in chemical instruments and methods, aluminum compounds, inorganic chemistry, etc., can solve the problem of sodium aluminate solution viscosity, specific gravity and specific heat increase, reduce the decomposition rate of aluminum hydroxide seed crystals, and reduce oxidation Aluminum dissolution rate and other issues, to achieve the effect of good feasibility, cost saving and high efficiency

Pending Publication Date: 2021-09-24
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The presence of sulfur and organic matter will increase the viscosity, specific gravity, and specific heat of sodium aluminate solution, which will seriously affect the separation of ore pulp; prevent the contact between lye and bauxite, and reduce the dissolution rate of alumina; it will make the product yellow and reduce oxidation. Aluminum quality; reduced aluminum hydroxide seed decomposition rate, lower yield
[0003] At present, there is no method that can effectively remove all sulfur and organic matter in bauxite at the same time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: Tested by a carbon sulfur analyzer, the aluminum mineral sulfur content is 1.76%, and the carbon content is 0.5%;

[0021] The removal method of sulfur and organic matter in aluminum ore, the specific steps are as follows:

[0022] (1) Add the alkali solution to the aluminum mine, alkaline leaching 3 h is performed at a temperature of 90 ° C, stirring, and the concentration of NaOH in the alkali is 15g / L; the base liquid and the aluminum mine The liquid solid ratio is 4: 1 (ml: g);

[0023] (2) The basic inequal is separated from the pretreatment of aluminum mine and alkaline leaching liquid. The pre-treated aluminum mine enters the Bayer method production process, and the alkaline leaching liquid is placed in a high pressure reactor, and the oxygen is accessed. The sulfur and organic substance in which the calcium salt is added, removes sulfur and organic matter in the basic leaching solution to obtain a slurry; wherein the amount of the calcium salt CaO is 8 ...

Embodiment 2

[0026] Example 2: Tested by a carbon sulfur analyzer, the aluminum mineral sulfur content was 1.76%, and the carbon content was 0.5%;

[0027] The removal method of sulfur and organic matter in aluminum ore, the specific steps are as follows:

[0028] (1) Add an alkaline solution to the aluminum mine, alkaline leaching at a temperature of 100 ° C, stirring, to obtain an alkaline slurry; wherein the concentration of NaOH in the alkali is 15 g / L; the base liquid and the aluminum mine The liquid solid ratio is 3: 1 (ml: g);

[0029] (2) The basic inequal is separated from the pretreatment of aluminum mine and alkaline leaching liquid. The pre-treated aluminum mine enters the Bayer method production process, and the alkaline leaching liquid is placed in a high pressure reactor, and the oxygen is accessed. The addition of calcium salts is oxidized to remove the sulfur and organic matter in the alkaline leaching solution to obtain a slurry; wherein the amount of calcium salt CaO is 8 ...

Embodiment 3

[0032] Example 3: Tested by a carbon sulfur analyzer, the aluminum mineral sulfur content is 1.76%, and the carbon content is 0.5%;

[0033] The removal method of sulfur and organic matter in aluminum ore, the specific steps are as follows:

[0034] (1) Add the alkali solution to the aluminum mine, alkaline leaching at a temperature of 120 ° C, stirring, to obtain an alkaline slurry; wherein the concentration of NaOH in the base is 18 g / L; the alkali solution and the aluminum mine The liquid solid ratio is 3: 1 (ml: g);

[0035] (2) The basic inequal is separated from the pretreatment of aluminum mine and alkaline leaching liquid. The pre-treated aluminum mine enters the Bayer method production process, and the alkaline leaching liquid is placed in a high pressure reactor, and the oxygen is accessed. The sulfur and organic substances in the alkaline leaching liquid were removed by wet oxidation, and the amount of a slurry was obtained; wherein the amount of the calcium salt CaO ...

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PUM

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Abstract

The invention relates to a method for removing sulfur and organic matters in bauxite, and belongs to the technical field of mineral treatment. The method comprises the steps of adding alkali liquor into bauxite, and carrying out alkaline leaching at the temperature of 90-180 DEG C under stirring for 3-6 hours to obtain alkaline ore pulp; carrying out solid-liquid separation on the alkaline ore pulp to obtain pretreated bauxite and alkaline leachate, enabling the pretreated bauxite to enter a Bayer process flow, adding calcium salt into the alkaline leachate, carrying out wet oxidation, and removing sulfur and organic matters in the alkaline leachate to obtain slurry; and filtering the slurry to obtain filtrate and filter residues, evaporating and concentrating the filtrate, returning to replace alkali liquor, and roasting the filter residues to obtain calcium salt. According to the method, sulfur and organic matters in the bauxite can be effectively removed, the quality and yield of aluminum oxide are improved, the circulation of the whole process and the recycling of materials are realized, the practicability and operability are relatively high, and the economic benefit is relatively good.

Description

Technical field [0001] The present invention relates to a removal method of sulfur and organic matter in aluminum mine, belonging to the field of mineral treatment. Background technique [0002] At present, more than 90% of the global production of alumina, more than 90% of the Bayer method production process. However, with high taste aluminum mines, high sulfur and high organic bodies have to be applied to the alumina production industry. Sulfur and organic matter are increasingly evident in Bayer Method. The presence of sulfur and organic matter can increase the viscosity, specific gravity of the aluminate solution, and severely affect the separation of the inerals; prevent the alkali solution to contact the aluminum mine, reduce the dissolution rate of alumina; it will make the product color yellow, reduce oxidation The quality of aluminum; reduces the rate of decomposition rate of alumina, reducing yield. [0003] Currently, there is no way to effectively remove sulfur and or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/06C01F7/46C01F11/04C01F11/06
CPCC01F7/0613C01F7/46C01F11/04C01F11/06
Inventor 刘战伟李梦楠颜恒维马文会魏杰谢克强吕国强于洁李绍元雷云伍继君魏奎先秦博陈正杰吴丹丹
Owner KUNMING UNIV OF SCI & TECH
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