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Step-by-step desiliconizing and upgrading method for high-aluminum and high-silicon bauxite

A technology for desiliconization of bauxite, which is applied in chemical instruments and methods, solid separation, wet separation, etc., can solve the problems of high chemical consumption in flotation, high separation cost, and high energy consumption in grinding, so as to avoid desiliconization. Poor silicon effect, reduced amount of beneficiation, simple and flexible process

Active Publication Date: 2017-06-30
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high yield of bauxite concentrate, the positive flotation process has many problems such as fine grinding particle size, long process, large chemical consumption, high sorting cost, and tailings are not easy to settle and filter.
Compared with the flotation process, the re-election process (such as spiral chute, hydrocyclone, etc.) does not use chemicals, the process is simple, economical and environmentally friendly, but its research and application in bauxite desiliconization is not widespread
[0004] There are a large number of high-alumina and high-silicon bauxite resources in my country, which are mainly diaspore type with high aluminum content, high silicon content, and low aluminum-silicon ratio. If a single washing and gravity desiliconization process is adopted , it faces the problems of large loss of medium and fine-grained bauxite and low recovery rate. If a single flotation desilication process is adopted, the ore is required to be finely ground and full-grained flotation. Therefore, according to the characteristics of high-alumina and high-silicon bauxite, how to fully combine the respective advantages of gravity separation and flotation technology to develop an economical, environmentally friendly and efficient mineral processing The method of desiliconization and upgrading is of great significance to realize the development and utilization of a large number of similar resources in my country

Method used

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  • Step-by-step desiliconizing and upgrading method for high-aluminum and high-silicon bauxite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Such as figure 1 As shown, the step-by-step desiliconization and upgrading method of this high-alumina and high-silicon type bauxite, its specific steps are as follows:

[0027] (1) The first step of gravity desiliconization in the spiral chute: the high-aluminum high-silicon bauxite (mine sample I), which contains Al 2 o 3 65.41wt%, SiO 2 13.15wt%, the aluminum-silicon ratio (A / S) is 4.97, the main aluminum minerals are diaspore (48.21wt%) and boehmite (17.20wt%), and the remaining gangue minerals are kaolinite, Mainly illite and quartz. The ore sample was crushed, screened and ground to -200 mesh to account for 70%, water was added to adjust the slurry concentration to 15% (m / v), and a spiral chute was used to carry out a roughing and a beneficiation respectively, and the concentrate of the spiral chute was Coarse-grained bauxite concentrate.

[0028] (2) The second step of hydrocyclone combined with spiral chute gravity desiliconization: the rough ore selection ...

Embodiment 2

[0032] Such as figure 1 As shown, the step-by-step desiliconization and upgrading method of this high-alumina and high-silicon type bauxite, its specific steps are as follows:

[0033] (1) The first step of gravity desiliconization in the spiral chute: the high-aluminum high-silicon bauxite (mine sample II), which contains Al 2 o 3 66.57wt%, SiO 2 12.42wt%, the aluminum-silicon ratio (A / S) is 5.36, the main aluminum minerals are diaspore (52.03wt%) and boehmite (14.54wt%), and the remaining gangue minerals are kaolinite, Mainly muscovite and quartz. The ore sample was crushed, screened and ground to -200 mesh to account for 70%, water was added to adjust the slurry concentration to 15% (m / v), and a spiral chute was used to carry out a roughing and a beneficiation respectively, and the concentrate of the spiral chute was Coarse-grained bauxite concentrate.

[0034] (2) The second step of hydrocyclone combined with spiral chute gravity desiliconization: the rough ore selectio...

Embodiment 3

[0038] Such as figure 1 As shown, the step-by-step desiliconization and upgrading method of this high-alumina and high-silicon type bauxite, its specific steps are as follows:

[0039] (1) The first step of gravity desiliconization in the spiral chute: the high-aluminum high-silicon bauxite ore (mine sample III), which contains Al 2 o 3 64.78wt%, SiO 2 12.82wt%, the aluminum-silicon ratio (A / S) is 5.05, the main aluminum minerals are diaspore (49.53wt%) and boehmite (15.25wt%), and the rest of the gangue minerals are quartz, leaf wax Stone, kaolinite and so on. The ore sample was crushed, screened and ground to -200 mesh to account for 75%, water was added to adjust the pulp concentration to 20% (m / v), and a spiral chute was used to carry out a roughing and a beneficiation respectively, and the concentrate of the spiral chute was Coarse-grained bauxite concentrate.

[0040] (2) The second step of hydrocyclone combined with spiral chute gravity desiliconization: the rough ...

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Abstract

The invention belongs to the technical field of mineral processing engineering and relates to a step-by-step desiliconizing and upgrading method for high-aluminum and high-silicon bauxite. The method comprises the steps that firstly, the high-aluminum and high-silicon bauxite is subjected to rough grinding, slurry mixing is conducted, a spiral chute is adopted to conduct the first step of desiliconizing, and coarse grain bauxite concentrate ores are obtained through roughing and concentrating; secondly, middlings in the first step are combined and reground, slurry mixing is conducted, the second step of desiliconizing is conducted through a hydraulic cyclone and the spiral chute in sequence, specifically, desliming is conducted through the hydraulic cyclone firstly, settled sand of slime is subjected to roughing and concentrating through the spiral chute, and medium grain bauxite concentrate ores are obtained; and thirdly, the middlings and tailings obtained in the first and second steps are combined and subjected to floatation desiliconizing, fine grain bauxite concentrate ores are obtained through a closed floatation process. By means of the step-by-step desiliconizing and upgrading method that the coarse grain ores are enriched in the spiral chute after rough grinding, after the middlings are reground, the medium grain ores are enriched in the hydraulic cyclone united with the spiral chute, and tailing fine slime flotation is conducted to enrich the fine grain ores, the bauxite concentrate ores of different grain grades are obtained by stages, so that the step-by-step desiliconizing and upgrading method has the advantages that drug consumption is low, the recovery rate is high, and desiliconizing is thorough.

Description

technical field [0001] The invention relates to a step-by-step desiliconization and upgrading method of high-alumina and high-silicon bauxite, which belongs to the field of mineral processing engineering. Background technique [0002] my country is the world's largest producer and consumer of aluminum. Bauxite is the main raw material for the aluminum industry. The amount of bauxite resources in my country ranks 9th in the world, the reserves are medium and the quality is not high. Due to the main characteristics of draumite type, it cannot meet the raw material requirements of the Bayer process for alumina production (A / S>8). Therefore, ore dressing and desiliconization to obtain high-alumina-silicon ratio concentrates are the main tasks for the separation of bauxite in my country. Purpose. [0003] In recent years, with the continuous improvement of mineral processing technology, the beneficiation and desiliconization process of high-silicon bauxite has achieved remark...

Claims

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Application Information

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IPC IPC(8): B03B9/00B03B5/62B03D1/018B03D101/06B03D101/04B03D101/02B03D103/04
CPCB03B5/626B03B9/00B03D1/018B03D2201/04B03D2201/02B03D2201/06B03D2201/005B03D2203/04
Inventor 谢海云丁超高利坤庄故章周平魏志聪陈禄政张鹏飞童雄
Owner KUNMING UNIV OF SCI & TECH
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