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Flocculant adding method in selective bauxite flocculation process

A flocculant, selective technology, applied in the direction of selective deposition, solid separation, etc., can solve the problems of high temperature, pressure and caustic ratio conditions, poor economic benefits, low aluminum-silicon ratio, etc., to achieve good selection index, The effect of large floc particle size and obvious selective flocculation phenomenon

Inactive Publication Date: 2009-09-09
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The dissolution of diaspore requires high temperature, pressure and caustic ratio conditions; in addition, due to the low aluminum-silicon ratio of the ore, when this ore is used as a raw material for the Bayer process to produce alumina, the economic benefit is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] This method was used to conduct a flocculation and sedimentation test on a difficult-to-grind low-aluminum-silicon ratio bauxite in Henan. Al in this mineral 2 o 3 The content is 61.87, SiO 2 The content is 14.76, and the aluminum-silicon ratio is 4.19.

[0023] Add 2500g / t sodium carbonate to the ore, and grind it to -0.074mm to account for 95%; add fresh water to the ore concentration of about 10%, and add modified starch with a dilution concentration of 0.1% at 20 g / t to the ore slurry to flow into the concentrated The mud hopper is inside a 2-meter-long, 10-cm-diameter pipe; the slurry settles in the thick mud hopper.

[0024] After adopting the method, a bauxite concentrate with a recovery rate of 74.32% and an aluminum-silicon ratio of 6.52 can be obtained.

Embodiment 2

[0026] Using this method, a selective flocculation test was carried out on a bauxite with a low aluminum-silicon ratio in Henan. Al in this mineral 2 o 3 The content is 64.18, SiO 2 The content is 14.26, and the aluminum-silicon ratio is 4.5.

[0027] Add 2500g / t sodium carbonate to the ore, grind it to -0.074mm and account for 95%; add fresh water to the ore concentration of about 15%, and add the modified polyacrylamide with a dilution concentration of 0.001% to the amount of 5 g / ton into the slurry The 3-meter-long and 15-cm-diameter pipe of the thick mud hopper; the slurry settles in the inclined plate thickening box.

[0028] After adopting the method, a bauxite concentrate with a recovery rate of 86.68% and an aluminum-silicon ratio of 6.78 can be obtained.

Embodiment 3

[0030] The flocculant is modified polyacrylamide, and the dilution concentration of the flocculant is 0.01%. The rest of the steps and conditions are the same as in Example 1.

[0031] Processing a medium-grade bauxite with an aluminum-silicon ratio of 5.6 in Henan.

[0032] After adopting the method, a bauxite concentrate with a recovery rate of 85.9% and an aluminum-silicon ratio of 9.12 can be obtained.

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PUM

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Abstract

The invention discloses a flocculant adding method in a selective bauxite flocculation process. A flocculant adding point is arranged in a pipeline of sedimentation equipment so that ore pulp flows into the pipeline, mixes with flocculant and generates the flocculation effect in the flowing process. The invention overcomes the defects that the prior flocculant adding modes are easy to cause the insufficient reaction between the flocculant and the ore pulp, floc agglomerations are easy to scatter, a flocculation phenomenon is not obvious, and the like; in addition, the invention develops a simple and feasible and practical flocculant adding mode with great floc agglomeration granularity, obvious selective flocculation phenomenon and good grading index.

Description

technical field [0001] The invention belongs to the field of mineral processing, and in particular relates to a method for adding a flocculant in a bauxite selective flocculation process. Background technique [0002] my country's bauxite obviously has the characteristics of high aluminum, high silicon and low iron. Although, Al in my country's bauxite 2 o 3 The content is relatively high, but due to the high SiO content in the ore 2 , so the aluminum-silicon ratio of the ore is generally lower. Among the 255 mining areas in 7 provinces including Shanxi, Henan, Guangxi, Guizhou, Shandong, Sichuan and Yunnan, which account for 96% of my country's total bauxite reserves, the average grade (mass fraction) of bauxite is: Al 2 o 3 61.99%, SiO 2 10.4%, Fe 2 o 3 7.73%. The average aluminum-silicon ratio is 5.96, and the aluminum-silicon ratio of nearly half of the reserves of bauxite is 4-6. The dissolution of diaspore requires high temperature, pressure and caustic ratio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03D3/06
Inventor 孙伟胡岳华刘文莉
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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