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Method for refining high-purity quartz sand from ordinary quartz sand

A high-purity quartz sand and quartz sand technology, applied in the direction of silica, silicon oxide, etc., can solve the problems of low added value of products, air pollution, high impurity content, etc., to achieve thorough removal of impurities, reduction of usage, and enhancement of capture capacity Effect

Active Publication Date: 2018-01-09
江苏凯达石英股份有限公司
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AI Technical Summary

Benefits of technology

This technology improves how fine silicon dioxides (SiO2) particles made from pure crystallized feldspathylenetoxysulfonite) react chemically when heated at very high temperatures for several hours without losing any energy. By mixing certain salts together, these processes produce vapor phase acids which help dissolving finely sided Si02 grains effectively. These methods also involve washing away excessive alkali after each chemical treatment, resulting in improved purity levels compared to previous techniques.

Problems solved by technology

This patented technical problem addressed by this patents relates to improving the quality of crude quartile sands (Si02) made from natural sources like ammonite clay through various methods including grinding, heat treatment, purification, washing, polishing, drying, baking, milling, and others. These techniques aim at reducing defective particles called chlorine gas which causes environmental concerns during manufacturing operations.

Method used

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Effect test

Embodiment 1

[0022] (1) Rough selection: choose SiO 2 Ordinary quartz sand with a content ≥ 98%, remove the obvious impurities and foreign matter;

[0023] (2) The first calcination-water quenching: from room temperature to 500°C per minute, and from 500°C to 4°C per minute, the calcination temperature is maintained at 650°C for 30 minutes, and at 950°C for 30 minutes. Maintain 1300°C for 60 minutes; then rinse the quartz sand with 0°C ice-water mixture for 30 seconds, then soak the quartz sand in 25°C water for 5 minutes while applying ultrasound to crack the quartz sand;

[0024] (3) Pulverization: use wet grinding or dry grinding to grind the quartz sand to 100-160 mesh, wash and dry with deionized water;

[0025] (4) 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 im...

Embodiment 2

[0030] (1) Rough selection: choose SiO 2 Ordinary quartz sand with a content ≥ 98%, remove the obvious impurities and foreign matter;

[0031] (2) The first calcination-water quenching: from room temperature to 500°C per minute, and from 500°C to 4°C per minute, the calcination temperature is maintained at 650°C for 30 minutes, and at 950°C for 30 minutes. Maintain 1300°C for 60 minutes; then rinse the quartz sand with 0°C ice-water mixture for 30 seconds, then soak the quartz sand in 25°C water for 5 minutes while applying ultrasound to crack the quartz sand;

[0032] (3) Pulverization: use wet grinding or dry grinding to grind the quartz sand to 100-160 mesh, wash and dry with deionized water;

[0033] (4) 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 im...

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PUM

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Abstract

The invention discloses a method for refining high-purity quartz sand from ordinary quartz sand, which mainly comprises the working procedures of rough selection, first calcination, water quenching, comminution, magnetic separation, electric separation, second calcination, rinsing, pickling, cleaning, drying and the like. Before the second calcination, salt is mixed with the ordinary quartz sand to generate corresponding acid, and the temperature and calcining time are adjusted to make the salt react to form acidic gas for being diffused into the surface cracks or pores of the quartz sand; thequartz sand is rinsed, and then the quartz sand is placed in an organic pickling solution added with a specific chelating agent; the process disclosed by the invention can remove impurities such as iron and aluminum more completely, and finally, high-purity quartz sand with the SiO2 content being larger than or equal to 99.95% and ferric oxide content being less than or equal to 20ppm is preparedfrom the ordinary quartz sand with the SiO2 content being less than or equal to 99.8% and the ferric oxide content being larger than or equal to 200ppm.

Description

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Claims

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Application Information

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Owner 江苏凯达石英股份有限公司
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