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-si

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0023] Example 1

[0024] This method is used to carry out flocculation and settlement tests 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 to silicon ratio is 5.71.

[0025] Grind the bauxite with low aluminum to silicon ratio to -0.074mm, accounting for 92%, add 2500 g / ton of sodium carbonate during the grinding process; add fresh water to about 10% of the ore concentration, stir to make it fully dispersed and then settle out Separate the first part of the bauxite with the aluminum-silicon ratio up to the standard; add 0.2 g / ton of modified starch to the desilted tailings (modified starch uses cerium ammonium nitrate as initiator, and starch and acrylamide are at 30 React for 3 hours at a temperature of ~40℃ to obtain acrylamide grafted starch); then the tailings added with flocculant are fully stirred and dispersed, then settled and desludged, and the second part of bauxite concentrate with the aluminum-si...

Example Embodiment

[0027] Example 2

[0028] This method is used to carry out flocculation and settlement tests 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 to silicon ratio is 4.88.

[0029] Grind the bauxite with low aluminum to silicon ratio to -0.074mm, accounting for 92%, add 2500 g / ton of sodium carbonate during the grinding process; add fresh water to about 10% of the ore concentration, stir to make it fully dispersed and then settle out Separate the first part of bauxite with the aluminum-silicon ratio up to the standard; add 0.4 g / ton of modified starch to the desilted tailings (the modification method of modified starch is the same as in Example 1); then add flocculant After the tailings are fully stirred and dispersed, they will settle and desludge, and the second part of the bauxite concentrate with the aluminum-silicon ratio up to the standard is separated;

[0030] After using this method, a bauxite concentrate ...

Example Embodiment

[0031] Example 3

[0032] Add 4500 g / ton of sodium carbonate during the grinding process; add 1800 g / ton of modified starch to the deslimed tailings (the modification method of modified starch is the same as in Example 1); the rest of the steps and conditions are the same as in the example 1.

[0033] After adopting this 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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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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