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Method for processing bauxite tailings by flocculating agent

A flocculant and bauxite technology, which is applied in the field of flocculant treatment of bauxite beneficiation tailings, can solve the problems of loose flocculation particles, high cost, and large dosage, and achieve fast settling speed, reduced dosage, and less dosage of chemicals Effect

Inactive Publication Date: 2010-06-16
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polyacrylamide has the disadvantages of large dosage, high cost, high toxicity, and loose flocculated particles.

Method used

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  • Method for processing bauxite tailings by flocculating agent
  • Method for processing bauxite tailings by flocculating agent
  • Method for processing bauxite tailings by flocculating agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] This method was used to carry out the flocculation and settlement test on the selective flocculation tailings of bauxite in a mining area in Henan. The main minerals in the tailings are clay minerals. which contains Al 2 o 3 45.6%, SiO 2 33.65%, the ratio of aluminum to silicon is 1.35, and the pulp concentration is 3%.

[0027] Adjust the slurry with hydrochloric acid until the pH value is 3.0, and add 40 g / ton of 0.1% dimethyldiallyl ammonium chloride. Use a mechanical stirrer to stir for 3 minutes at a speed of 300 rpm, and allow the slurry to settle. It can be seen that a clear sedimentation interface is formed immediately, and the supernatant is clear. The settling speed can reach 35 mm / min. It can remove 80% of the water in the pulp.

Embodiment 2

[0029] This method was used to carry out the flocculation and sedimentation test on the washing sludge of an aluminum factory in Guangxi. According to phase analysis, the main components of the slime are diaspore 13.7, gibbsite 12.1 and kaolinite 47.4. The size of the minerals smaller than 0.010mm accounts for 76.64%.

[0030] Adjust the slurry with hydrochloric acid until the pH value is 5.5, and add 55 g / ton of dimethyldiallyl ammonium chloride with a concentration of 0.006% to the tailings slurry with a concentration of 5%. Use a mechanical stirrer to stir for 3 minutes at a speed of 300 rpm, and allow the slurry to settle. It can be seen that a clear sedimentation interface is formed immediately, and the supernatant is clear. The settling speed can reach 37 mm / min. It can remove 78% of the water in the pulp.

Embodiment 3

[0032] This method was used to carry out the flocculation and sedimentation test on the positive flotation tailings of an aluminum plant in Henan. The main minerals in the tailings are clay minerals. About 75% of them are extremely fine particles with a particle size of less than 0.020mm, including 20.79% of diaspore, 19.90% of kaolinite, 27.82% of illite, and 7.50% of pyrophyllite.

[0033] Use hydrochloric acid to adjust the slurry to pH 7.0, add 70 g / ton of dimethyldiallyl ammonium chloride with a concentration of 10% to the tailings slurry with a concentration of 5%, and 100 g / ton of polyaluminum ferric sulfate . Polyaluminum ferric sulfate was added before dimethyl and allyl ammonium chloride. Use a mechanical stirrer to stir for 3 minutes at a speed of 300 rpm, and allow the slurry to settle. It can be seen that a clear sedimentation interface is formed immediately, and the supernatant is clear. The settling speed can reach 30 mm / min. It can remove 75% of the water ...

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Abstract

The invention relates to a method for processing bauxite tailings by flocculating agent, in particular relating to a method for processing the bauxite tailings by flocculation selectively. Considering the characteristics of the bauxite tailings completely, the invention is characterized by comprising the following steps: using a novel cation polymeric flocculant as the flocculating agent for the flocculation bauxite tailings, preparing the concentration of the novel flocculant to be 0.001-10%, adopting an inorganic flocculant containing Fe ions or Al ions directly or in a combined manner or polyacrylamide in various types, adding into the tailings slurry, and stirring slowly and fully to enable the superfine mineral particles to be in flocculate sedimentation. The invention has the advantages of small medicine dosage, saved production cost, good sedimentation effect, shortened tailings processing procedures and less environmental pollution.

Description

technical field [0001] The invention belongs to the field of mineral processing, and in particular relates to a method for treating bauxite mineral processing tailings with a flocculant. 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 temperature, pressure and caustic ratio con...

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 CENT SOUTH UNIV
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