Application of collecting agent in reverse floatation of bauxite

Abstract

The invention relates to the application of a collecting agent in reverse floatation of bauxite. The application of quaternary phosphonium salt in the reverse floatation of the bauxite is developed in full accordance with the characteristics of low-grade bauxite and the strong electrostatic attraction of the quaternary phosphonium salt to silicate minerals, so selective collection of diasporite and kaolinite by using the collecting agent is realized. The agent has higher selecting capability and collecting performance than the conventional reverse floatation collecting agents such as primary amine, tertiary amine and quaternary ammonium, and has the advantages of small dosage, good index, environmental friendliness and the like. When the agent is used for treating the bauxite of which theratio of aluminum to silicon in raw ore is 5 to 5.5, the ratio of the aluminum to the silicon in obtained finished ore is more than 8 and the recovery rate of Al2O3 is more than 88 percent.

Description

technical field

[0001] The invention belongs to the field of ore dressing, and relates to the application of a reverse flotation collector for bauxite, in particular to the application in the field of desiliconization of bauxite with a low aluminum-silicon ratio. Background technique

[0002] my country's bauxite has the characteristics of high aluminum, high silicon, and low aluminum-silicon ratio. 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 conditions; in addition, due to the low aluminum-silicon ratio of the ore, when this ore is used as a ra...

Examples

Embodiment 1

[0022] The pure minerals of diaspore and kaolinite were tested by the method of the invention.

[0023] The single mineral flotation experiment was carried out on the XFG hanging cell flotation machine. Weigh 2g of minerals each time into a 40ml flotation tank, add 30ml of distilled water, adjust the slurry for 1min, adjust the pH value with HCl or NaOH for 3min, measure the pH value with a PHS-3C precision pH meter, add quaternary phosphorus salt and stir 3 minutes, 4 minutes of flotation. The flotation process adopts manual foam scraping. After the flotation is completed, the scraped foam (concentrate) is dried, weighed, and the recovery rate is calculated.

[0024] After adopting the method, it can be obtained that the recovery rate of the new collector for kaolinite in the range of pH=5-7 is above 90%, while the recovery rate of diaspore is below 50%.

Embodiment 2

[0026] Using this method, a bauxite with an aluminum-silicon ratio of 5-5.5 in Henan was tested for flotation.

[0027] Grind the bauxite to -0.074mm, accounting for 88%, add 1000 g / t of sodium carbonate during the grinding process; then add 200 g / t of water glass or 60 g / t of sodium hexametaphosphate as inhibitor and collector The quaternary phosphorus salt is 100g / t, and the rough separation is carried out, and then the chemical agent is gradually reduced for 4 times of separation to obtain the concentrate.

[0028] After adopting this method, Al can be obtained 2 o 3 The recovery rate is 88%, and the aluminum-silicon ratio is greater than 8 concentrates.

technical field

[0001] The invention belongs to the field of ore dressing, and relates to the application of a reverse flotation collector for bauxite, in particular to the application in the field of desiliconization of bauxite with a low aluminum-silicon ratio. Background technique

[0002] my country's bauxite has the characteristics of high aluminum, high silicon, and low aluminum-silicon ratio. 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 conditions; in addition, due to the low aluminum-silicon ratio of the ore, when this ore is used as a ra...

Examples

Embodiment 1

[0022] The pure minerals of diaspore and kaolinite were tested by the method of the invention.

[0023] The single mineral flotation experiment was carried out on the XFG hanging cell flotation machine. Weigh 2g of minerals each time into a 40ml flotation tank, add 30ml of distilled water, adjust the slurry for 1min, adjust the pH value with HCl or NaOH for 3min, measure the pH value with a PHS-3C precision pH meter, add quaternary phosphorus salt and stir 3 minutes, 4 minutes of flotation. The flotation process adopts manual foam scraping. After the flotation is completed, the scraped foam (concentrate) is dried, weighed, and the recovery rate is calculated.

[0024] After adopting the method, it can be obtained that the recovery rate of the new collector for kaolinite in the range of pH=5-7 is above 90%, while the recovery rate of diaspore is below 50%.

Embodiment 2

[0026] Using this method, a bauxite with an aluminum-silicon ratio of 5-5.5 in Henan was tested for flotation.

[0027] Grind the bauxite to -0.074mm, accounting for 88%, add 1000 g / t of sodium carbonate during the grinding process; then add 200 g / t of water glass or 60 g / t of sodium hexametaphosphate as inhibitor and collector The quaternary phosphorus salt is 100g / t, and the rough separation is carried out, and then the chemical agent is gradually reduced for 4 times of separation to obtain the concentrate.

[0028] After adopting this method, Al can be obtained 2 o 3 The recovery rate is 88%, and the aluminum-silicon ratio is greater than 8 concentrates.

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