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Method for purifying quartz by chloridizing roasting

A technology of chlorination roasting and quartz, applied in the direction of silicon oxide, silicon dioxide, etc., can solve the problems of hydrofluoric acid pollution and other problems, achieve the effect of increasing the contact surface area, easy removal, and promoting flotation

Active Publication Date: 2020-11-03
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the above-mentioned technical deficiencies, and propose a method for purifying quartz by chlorination and roasting, which can effectively reduce the content of impurity elements in vein quartz, obtain quartz sand with high purity, and do not use hydrogen in the preparation process Hydrofluoric acid is environmentally friendly, and the method solves the technical problem of using hydrofluoric acid to pollute the environment in the prior art

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  • Method for purifying quartz by chloridizing roasting
  • Method for purifying quartz by chloridizing roasting
  • Method for purifying quartz by chloridizing roasting

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Embodiment 1

[0043] Embodiment 1 of the present invention provides a kind of method of chlorination roasting purification quartz, and this method comprises the steps:

[0044] (1) Magnetic separation and impurity removal: Grind and screen the vein quartz raw ore to prepare vein quartz sand with a particle size of 50-140 mesh. Add the vein quartz sand to a high-gradient magnetic separator at a flow rate of 1cm. the s -1 , the magnetic field intensity is 1.2T, and the magnetic separation is carried out to obtain a non-magnetic product;

[0045] (2) pickling and impurity removal: add the non-magnetic product to a dilute HCl solution with a mass fraction of 10% for pickling, and the solid ratio of the pickling solution is 500g.L -1 , pickling is carried out under stirring conditions, the stirring speed is 1600rpm, pickling is 25min, after pickling is completed, the pickling product is washed with ultrapure water for 2 to 3 times, and then filtered and vacuum-dried to obtain vein quartz concen...

Embodiment 2

[0051] Embodiment 2 of the present invention provides a kind of method for purifying quartz by chlorination roasting, and this method comprises the steps:

[0052] (1) Magnetic separation and impurity removal: Grind and screen the vein quartz raw ore to prepare vein quartz sand with a particle size of 50-140 mesh. Add the vein quartz sand to a high-gradient magnetic separator at a flow rate of 1cm. the s -1 , the magnetic field strength is 1.0T, and magnetic separation is carried out to obtain non-magnetic products;

[0053] (2) pickling and impurity removal: add the non-magnetic product to a dilute HCl solution with a mass fraction of 10% for pickling, and the solid ratio of the pickling solution is 500g.L -1 , pickling is carried out under stirring conditions, the stirring speed is 2000rpm, pickling for 15min, after the pickling is completed, the pickling product is washed with ultrapure water for 2 to 3 times, and then filtered and vacuum-dried to obtain vein quartz concen...

Embodiment 3

[0059] Embodiment 3 of the present invention provides a kind of method of chlorination roasting purification quartz, and this method comprises the steps:

[0060] (1) Magnetic separation and impurity removal: Grind and screen the vein quartz raw ore to prepare vein quartz sand with a particle size of 50-140 mesh. .s -1 , the magnetic field strength is 1.0T, and magnetic separation is carried out to obtain non-magnetic products;

[0061] (2) pickling and impurity removal: add the non-magnetic product to a dilute HCl solution with a mass fraction of 10% for pickling, and the solid ratio of the pickling solution is 500g.L -1 , pickling is carried out under stirring conditions, the stirring speed is 2000rpm, pickling for 15min, after the pickling is completed, the pickling product is washed with ultrapure water for 2 to 3 times, and then filtered and vacuum-dried to obtain vein quartz concentrate;

[0062] (3) Flotation treatment: adding mass fraction of 10% H to vein quartz con...

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Abstract

The invention discloses a method for purifying quartz by chloridizing roasting, and the method comprises the following steps: (1) carrying out ore grinding and magnetic separation impurity removal onvein quartz raw ore to obtain a non-magnetic product; (2) pickling the non-magnetic product with a diluted hydrochloric acid solution to obtain vein quartz concentrate; (3) adding acid into the vein quartz concentrate to adjust the pH value to 2-3, and then adding an anion collecting agent and a cation collecting agent into the vein quartz concentrate for flotation treatment; (4) mixing the floated vein quartz concentrate with a chlorinating agent, performing roasting at 850-950 DEG C for 5-9 hours, and carrying out water quenching treatment after roasting is finished; (5) mixing the chloridized roasted vein quartz concentrate with the leachate, and carrying out hot-pressing leaching treatment at 240-260 DEG C for 2-6 hours to obtain the leachate which is a mixed solution of a sulfuric acid solution and an ammonium chloride solution. According to the method, the quartz sand with high purity can be obtained, hydrofluoric acid is not used in the preparation process, and the method is environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of non-metallic mineral processing and purification, and in particular relates to a method for purifying quartz by chlorination and roasting. Background technique [0002] Quartz (quartz), the chemical formula is SiO 2 , is an important non-metallic mineral material, ordinary quartz sand is often used in ceramics, glass and glass products. And high purity quartz (high purity quartz), SiO 2 Content ≥ 99.9%, because of its excellent thermal properties, optical properties and electrical properties, it is a raw material for the manufacture of single crystal silicon, polycrystalline silicon, quartz glass, optical fibers, solar cells and integrated circuit substrates, which are widely used in optical fiber communications, aerospace , military industry, electronic technology and other fields, with the rapid development of electronic information technology, high-purity quartz materials are becoming more and more i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12
CPCC01B33/12C01P2006/80Y02P10/20
Inventor 李育彪柯春云肖蕲航王志杰
Owner WUHAN UNIV OF TECH