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Method for preparing high-purity quartz sand with vein quartz as raw material

A technology of high-purity quartz sand and vein quartz, applied in the direction of silicon dioxide, silicon oxide, etc., can solve the problems of hydrofluoric acid pollution and other problems, and achieve the effect of increasing the contact surface area

Inactive 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 preparing high-purity quartz sand with vein quartz as raw material, which can effectively reduce the content of impurity elements in vein quartz, obtain quartz sand with high purity, and prepare The process does not use hydrofluoric acid, which is environmentally friendly, and this method solves the technical problem of using hydrofluoric acid to pollute the environment in the prior art

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  • Method for preparing high-purity quartz sand with vein quartz as raw material
  • Method for preparing high-purity quartz sand with vein quartz as raw material
  • Method for preparing high-purity quartz sand with vein quartz as raw material

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Embodiment 1

[0041] Embodiment 1 of the present invention provides a method for preparing high-purity quartz sand from a vein quartz in Inner Mongolia. The method includes the following steps:

[0042] (1) Magnetic separation and impurity removal: Grinding and screening the vein quartz raw ore to prepare the vein quartz raw ore with a particle size of 50 to 140 meshes, adding the vein quartz raw ore to a periodic pulsating high-gradient magnetic separator, 1cm.s -1 , the pulse frequency is 200r.min -1 , the magnetic field strength is 1.0T, and magnetic separation is carried out to obtain non-magnetic products;

[0043] (2) pickling and impurity removal: the non-magnetic product is added to a dilute HCl solution with a volume fraction of 10% for pickling, the pickling liquid-solid ratio is 2:1, the pickling is carried out under stirring conditions, and the stirring speed is 1500rpm, Pickling for 15 minutes. After pickling, wash the pickled product with ultrapure water for 2 to 3 times, an...

Embodiment 2

[0049] Embodiment 2 of the present invention provides a method for preparing high-purity quartz sand from a vein quartz in Inner Mongolia. The method includes the following steps:

[0050] (1) Magnetic separation and impurity removal: Grinding and screening the vein quartz raw ore to prepare the vein quartz raw ore with a particle size of 50 to 140 meshes, adding the vein quartz raw ore to a periodic pulsating high-gradient magnetic separator, 1cm.s -1 , the pulse frequency is 400r.min -1 , the magnetic field intensity is 1.2T, and the magnetic separation is carried out to obtain a non-magnetic product;

[0051] (2) pickling and impurity removal: add the non-magnetic product to a dilute HCl solution with a volume fraction of 10% for pickling, the pickling liquid-solid ratio is 2:1, the pickling is carried out under stirring conditions, and the stirring speed is 1800rpm, Pickling for 20 minutes, after pickling, wash the pickling product with ultrapure water for 2 to 3 times, ...

Embodiment 3

[0057] Embodiment 3 of the present invention provides a kind of method that prepares high-purity quartz sand with a vein quartz of Inner Mongolia as raw material, and this method comprises the following steps:

[0058] (1) Magnetic separation and impurity removal: Grinding and screening the vein quartz raw ore to prepare the vein quartz raw ore with a particle size of 50 to 140 meshes, adding the vein quartz raw ore to a periodic pulsating high-gradient magnetic separator, 1cm.s -1 , the pulse frequency is 400r.min -1 , the magnetic field intensity is 1.2T, and the magnetic separation is carried out to obtain a non-magnetic product;

[0059] (2) pickling and impurity removal: add the non-magnetic product to a dilute HCl solution with a volume fraction of 10% for pickling, the pickling liquid-solid ratio is 2:1, the pickling is carried out under stirring conditions, and the stirring speed is 1800rpm, Pickling for 25 minutes, after pickling, wash the pickling product with ultr...

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Abstract

The invention discloses a method for preparing high-purity quartz sand with vein quartz as a raw material, which comprises the following steps: (1) carrying out magnetic separation and impurity removal on vein quartz raw ore to obtain a non-magnetic product; (2) acid-pickling the non-magnetic product with a diluted hydrochloric acid solution to obtain vein quartz concentrate; (3) blending the veinquartz concentrate into ore pulp, adjusting the pH value of the ore pulp to 2-4, and adding dodecylamine into the ore pulp for flotation treatment; (4) roasting the vein quartz concentrate subjectedto flotation at 700-1100 DEG C for 5-11 hours, and carrying out water quenching treatment on the vein quartz concentrate after roasting is finished; and (5) mixing the vein quartz concentrate obtainedafter roasting and water quenching treatment with leachate, performing hot-pressing leaching treatment, the hot-pressing leaching temperature ranging from 220 DEG C to 280 DEG C, the hot-pressing leaching time ranging from 4 h to 8 h, and the leachate being a mixed solution of a sulfuric acid solution and an ammonium chloride solution. According to the method, the quartz sand with high purity canbe obtained without use of hydrofluoric acid, so that the method is environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of processing and purifying non-metallic minerals, and in particular relates to a method for preparing high-purity quartz sand by using vein quartz as a raw material. 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 widely used in optical fiber communication, aerospace, military industry, electronic technology and other fields. With the rapid development of electronic information technology, ultra-high purity quartz materials appear more and more important. High purity quartz sand on SiO 2 The content requirements are high, and impurity elements (such as Fe, Al, K, Na and other elements) also n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12
CPCC01B33/12C01P2006/80
Inventor 李育彪肖蕲航柯春云王志杰
Owner WUHAN UNIV OF TECH