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Selective flocculation desiliconisation method against low aluminum silicon ratio bauxite

A technology of aluminum-silicon ratio and bauxite, which is applied in the field of desiliconization of bauxite and low-aluminum-silicon ratio bauxite, can solve the problems of high temperature, pressure and caustic ratio conditions, poor economic benefits, and aluminum-silicon ratio. Low-level problems, to achieve the effect of large economic value, high sorting index, and low aluminum-silicon ratio

Inactive Publication Date: 2009-05-27
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

[0024] This method was used to carry out the flocculation and sedimentation test on a bauxite mine in Henan. Al in this mineral 2 o 3 The content is 63.97, SiO 2 The content is 11.20, and the aluminum-silicon ratio is 5.71.

[0025] Grind the low-alumina-silicon ratio bauxite to -0.074mm and account for 92%, add 2500 g / t of sodium carbonate during the grinding process; add fresh water to the ore concentration of about 10%, stir to fully disperse it, then settle and remove Mud, separate the first part of the bauxite whose aluminum-silicon ratio reaches the standard; add 0.2 g / ton of modified starch (modified starch is based on cerium ammonium nitrate as initiator, starch and acrylamide at 30 ~40°C for 3 hours to obtain acrylamide grafted starch); then fully stir and disperse the tailings after adding the flocculant, then settle and deslim, and separate the second part of the bauxite concentrate with the aluminum-silicon ratio up to the standard .

[0026] After adopting th...

Embodiment 2

[0028] This method was used to carry out the flocculation and sedimentation test on a bauxite mine in Henan. Al in this mineral 2 o 3 The content is 56.24, SiO 2 The content is 11.53, and the aluminum-silicon ratio is 4.88.

[0029] Grind the low-alumina-silicon ratio bauxite to -0.074mm and account for 92%, add 2500 g / t of sodium carbonate during the grinding process; add fresh water to the ore concentration of about 10%, stir to fully disperse it, then settle and remove Sludge, isolate the bauxite that the first part of aluminum-silicon ratio reaches the standard; Add 0.4 grams / ton of modified starch (the modification method of modified starch is the same as embodiment 1) in one section of deslimed tailings; Then add flocculant The final tailings are fully stirred and dispersed, then settled and deslimed, and the second part of the bauxite concentrate whose aluminum-silicon ratio reaches the standard is separated;

[0030] After adopting the method, a bauxite concentrate...

Embodiment 3

[0032] Add 4500 grams / ton of sodium carbonate in the grinding process; Add 1800 grams / ton of modified starch in the tailings of desliming (the modification method of modified starch is the same as Example 1); All the other steps and conditions are the same as Example 1.

[0033] After adopting the method, a bauxite concentrate with a recovery rate of 95.13% and an aluminum-silicon ratio of 6.21 can be obtained.

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PUM

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Abstract

The invention discloses a method of selective flocculating settling desiliconization from alumyte with low ratio of silicate to aluminium by using a polymeric flocculant. The method comprises: the alumyte with low ratio of silicate to aluminium is ground to be fine, and is added with sodium carbonate when in the milling grinding process; the mixture is added with fresh water to be stirred, and then is settled for desliming after being fully scattered; the first part of alumyte having the qualified ratio of silicate to aluminium is separated; modified starch is added in a section of desliming tail mine; then, the desliming tail mine which is added with flocculant is fully stirred and scattered, and then is settled for desliming; the second part of alumyte concentrated ore having the qualified ratio of silicate to aluminium is separated. The sorting method has high target, good separating effect, simple process flow and low cost. By adopting the method, when the alumyte with the ratio of silicate to aluminium of 5.6-5.8 of crude ore is processed, the alumyte concentrated ore having the recovery rate of 85.51% and the ratio of silicate to aluminium of 9.02 is obtained; when the alumyte with the ratio of silicate to aluminium of 4.88 of crude ore is processed, the alumyte concentrated ore having the recovery rate of 86.74% and the ratio of silicate to aluminium of 6.63 is obtained.

Description

technical field [0001] The invention belongs to the field of mineral processing, and relates to a method for desiliconizing bauxite, in particular to a method for desiliconizing bauxite with a low aluminum-silicon ratio. 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 bauxite reserves is 4-6. The dissolution of diaspore requires high temperatu...

Claims

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Application Information

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IPC IPC(8): B03D3/06
Inventor 胡岳华孙伟刘文莉
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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