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Process for removing iron in glass sand through magnetic separation

A high-purity quartz sand, magnetic separation iron removal technology, applied in the field of magnetic separation technology, can solve the problem of incomplete separation of magnetic minerals from magnetic separation quartz sand, and achieve the effect of making up for the difficulty of increasing the magnetic field strength and reducing the requirements.

Inactive Publication Date: 2015-02-18
DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a technology based on the traditional technology and solve the problem of incomplete separation of magnetic minerals in the magnetic separation quartz sand in the traditional technology "magnetic separation-flotation-acid leaching" process, through which the magnetic impurities can be made Drop below 0.1ppm

Method used

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  • Process for removing iron in glass sand through magnetic separation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The raw material is quartz sand produced in Dabie Mountains, Hubei Province, with a particle size of 60-160 mesh, and the chemical composition of impurities is as follows (ppm):

[0030] the element

Al

Fe

Ti

Ni

co

Na

K

Li

concentration

47

31

7.5

0.7

0.5

23

22

0.8

[0031] The implementation steps are as follows:

[0032] (1) Put the sieved quartz sand into 10g / L dilute stannous chloride solution for sensitization at a constant temperature of 40°C for 30min.

[0033] (2) Take out the sensitized quartz sand and place it on the filter and rinse it with water for 2-3 times.

[0034] (3) Put the rinsed quartz sand into 0.0025g / L dilute palladium chloride solution for activation at a constant temperature of 40°C for 10 minutes.

[0035] (4) Take out the activated quartz sand and place it on the filter and rinse it with water for 2-3 times.

[0036] (5) Put the activated quartz sand into ...

Embodiment 2

[0044] The calculation of operating steps, raw materials and selection rate is the same as in Example 1.

[0045]The composition of electroless plating solution is the nickel chloride of 30g / L, the nickel sulfate of 35g / L, the sodium hypophosphite of 25g / L, the sodium acetate of 10g / L, the boric acid of 8g / L, the glutamic acid of 8g / L and 20g / L malic acid, the temperature is 95°C, the pH is 4, and the electroless plating time is 4min. The magnetic separator is a wet electromagnetic separator with a field strength of 23000GS. The pickling solution is a mixed solution of 2.5mol / L hydrochloric acid, 1.0mol / L nitric acid and 1.0mol / L hydrofluoric acid, the pickling temperature is 60°C, and the pickling time is 30h.

Embodiment 3

[0047] The calculation of operating steps, raw materials and selection rate is the same as in Example 1.

[0048] The composition of electroless plating solution is the nickel chloride of 30g / L, the nickel sulfate of 35g / L, the sodium hypophosphite of 25g / L, the sodium acetate of 10g / L, the boric acid of 8g / L, the glutamic acid of 8g / L and 20g / L malic acid, the temperature is 95°C, the pH is 4, and the electroless plating time is 6min. The magnetic separator is a wet electromagnetic separator with a field strength of 23000GS. The pickling solution is a mixed solution of 2.5mol / L hydrochloric acid, 1.0mol / L nitric acid and 1.0mol / L hydrofluoric acid, the pickling temperature is 60°C, and the pickling time is 30h.

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Abstract

The invention relates to a process for removing iron in glass sand through magnetic separation. On the basis of a traditional process for removing iron in the glass sand through magnetic separation, a magnetic metal is deposited on the surface of a silica sand particle through a chemical plating method to improve the magnetism of the silica sand particle, then the silica sand which originally has extremely low contents of magnetic impurities such as iron, nickel and cobalt and cannot be separated through magnetic separator is also separated out through magnetic separation, then the magnetic matters on the surface of the silica sand are dissolved and removed through an acid pickling process, so that the more thorough iron removal effect is achieved. Through the simple method, the magnetic impurities such as iron, cobalt and nickel in the glass sand are removed to be lower than 0.1 ppm through the magnetic separation and the pickling, not only is the quality of the glass sand improved, but also the requirements of the mineral separation and the field intensity of a magnetic field of the glass sand on the silica sand are greatly reduced.

Description

technical field [0001] The invention belongs to the field of purification of high-purity quartz sand, and in particular relates to a magnetic separation process. Background technique [0002] With the domestic electronics industry such as integrated circuits, IT industry such as optical fiber, home appliances, electric light sources, new energy sources such as solar energy, etc., the demand for quartz glass continues to increase, and the market demand for high-purity quartz sand increases accordingly. Its annual compound growth rate has exceeded 30%, far higher than the growth rate of general industrial products. These fields have very strict requirements on raw materials, and the allowable impurity content is very low, and its SiO 2 The content requirement is as high as 99.995%. When these special materials are produced by smelting or smelting methods, natural crystals are usually used as raw materials. However, natural crystal resources are becoming increasingly depleted...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03C1/015C23C18/36
Inventor 杨华邓仁卿胡灯红陈开敏
Owner DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD