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Ultralow-metal-content high-purity silica sand preparation method

A high-purity quartz sand and quartz sand technology, applied in chemical instruments and methods, wet separation, magnetic separation, etc., can solve the problems of poor separation effect, complicated pickling process, environmental pollution, etc., and improve the impurity removal effect. , Good flotation effect, the effect of removing impurities thoroughly

Active Publication Date: 2018-01-26
江苏凯达石英股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the pickling process is complicated, the cost is high, and it pollutes the environment seriously; electric separation or magnetic separation is suitable for impurity minerals such as feldspar, cuttings, pyrite, pyroxene, etc. The separation effect is not good; the basis of flotation is that the difference in the physical and chemical properties of the impurity ore and the surface of the quartz sand will cause it to have different buoyancy in the flotation agent, thereby removing the impurity ore. At present, there are mainly fluorine flotation and fluorine-free There are two methods of flotation, fluorine flotation has good effect but serious pollution, especially fluoride ion is difficult to degrade naturally in the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Rough selection: choose SiO 2 Content ≥ 98%, ordinary quartz sand with particle size ranging from 80 to 100 mesh, remove obvious impurities and foreign matter;

[0024] (2) The first calcination-water quenching-crushing: from room temperature to 8°C per minute to 500°C, from 500°C to 3°C per minute, the calcination temperature is maintained at 750°C for 30 minutes, and at 900°C for 30 minutes , maintained at 1300°C for 30 minutes; pour the quartz sand into 0.5mol / L sodium hydroxide solution at 0°C, stir and apply ultrasound for 15 minutes, use wet grinding to crush the quartz sand to 200-220 mesh, and use deionized rinse with water and dry;

[0025] (3) Magnetic separation-electric separation: Set the magnetic separator to magnetically separate the quartz sand under the magnetic field strength of 50-15000GS to remove magnetic impurities; use an electrostatic separator with a voltage of 25-35 kV to remove non-magnetic impurities;

[0026] (4) The second calcinatio...

Embodiment 2

[0032] (1) Rough selection: choose SiO 2 Content ≤ 98%, ordinary quartz sand with particle size ranging from 80 to 100 mesh, remove obvious impurities and foreign matter;

[0033] (2) The first calcination-water quenching-crushing: from room temperature to 10°C per minute to 500°C, from 500°C to 5°C per minute, the calcination temperature is maintained at 750°C for 30 minutes, and at 900°C for 30 minutes , maintained at 1300°C for 30 minutes; pour the quartz sand into 0.6mol / L sodium hydroxide solution at 0°C, stir and apply ultrasound for 15 minutes, use wet grinding to crush the quartz sand to 200-220 mesh, and use deionized rinse with water and dry;

[0034] (3) Magnetic separation-electric separation: Set the magnetic separator to magnetically separate the quartz sand under the magnetic field strength of 50-15000GS to remove magnetic impurities; use an electrostatic separator with a voltage of 25-35 kV to remove non-magnetic impurities;

[0035] (4) The second calcinati...

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Abstract

The invention discloses an ultralow-metal-content high-purity silica sand preparation method. The ultralow-metal-content high-purity silica sand preparation method mainly comprises the technologies ofmaterial selection, first-time burning, water quenching, smashing, magnetic separation, electric separation, second-time calcining, water quenching, acid pickling, flotation, washing and the like; asodium hydroxide solution is adopted for water quenching after first-time burning is carried out, sodium hydroxide solid is mixed in the second-time calcining process, a formic acid solution containing 2,2'-dipyridyl is adopted as an acid pickling solution for acid pickling, and an significant improvement is made for the floatation process in the aspect of a collecting agent. According to the silica sand purification process, common silica sand with the SiO2 content smaller than or equal to 98% can serve as a raw material to obtain ultralow-metal-content high-purity silica sand with the SiO2 content larger than or equal to 99.97% and the impurity metal total amount smaller than or equal to 30ppm, cost is saved, and the technologies are more environment-friendly.

Description

technical field [0001] The invention relates to the field of inorganic material processing, in particular to a method for preparing high-purity quartz sand with ultra-low metal content. Background technique [0002] Quartz sand is a hard, wear-resistant, chemically stable silicate mineral, the main chemical composition is SiO 2 . The unique physical and chemical properties of quartz sand make it not only widely used in traditional industries such as casting, metallurgy, rubber, abrasives, ceramics, and construction, but also in high-tech industries such as aerospace, IT, communications, and solar cells. It plays an irreplaceable role in the field. For quartz sand products used in cutting-edge technology, not only the silica content is required to reach a certain standard, but also the impurity metals such as iron and aluminum are strictly controlled. [0003] Because quartz is associated with various impurity minerals during rock formation and mineralization, such as feld...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03B7/00B03C1/30C01B33/12
Inventor 张勋张凤凯李玉军赵云良刘祥友
Owner 江苏凯达石英股份有限公司
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