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Processing purification technology for high-purity quartz sand tailings

A technology of quartz sand tailings and high-purity quartz sand, applied in the directions of silica and silicon oxide, can solve the problems of low added value of tailings and quartz sand, high cost of high-purity quartz sand, and difficulty in degrading fluorine atoms. Better calcination effect, better purification effect and complete reaction effect

Active Publication Date: 2017-12-15
江苏凯达石英股份有限公司
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Problems solved by technology

[0003] Domestically, high-purity quartz sand is mostly made of high-quality raw materials such as crystal and vein quartz ore. However, with the gradual depletion of high-quality mineral resources, the cost of high-purity quartz sand is high. At the same time, every ton of high-purity quartz sand is usually produced. It needs to consume 2.5 tons of quartz raw materials, resulting in 1.5 tons of tailings. Compared with high-purity quartz sand products, there are more air bubbles in the quartz sand tailings, and the content of iron, aluminum, magnesium, calcium and other elements is higher. They mostly form inclusion impurities in quartz sand in the form of oxides, feldspar, kaolinite, mica, etc., which are difficult to remove
Usually, quartz sand production enterprises will divide the tailings into quartz sand of different quality grades for sale. Compared with high-purity quartz sand, the added value of tailings quartz sand is low, and it is difficult to apply to chips, optical fibers, microelectronics, aerospace, etc. Advanced fields
In the further purification of tailings, the removal of metal impurities is the key. Usually strong acids such as hydrogen fluoride, hydrogen chloride, nitric acid or sulfuric acid are used to prepare acid solution to soak quartz sand to remove metal impurities, but high-concentration inorganic pickling will affect the production equipment. Severe corrosion and environmental pollution, especially fluorine atoms are difficult to degrade in the environment

Method used

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  • Processing purification technology for high-purity quartz sand tailings

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Embodiment 1

[0021] (1) Rough separation-cleaning-drying: Before purification, the silica content of quartz sand tailings is ≤95.0%, and the content of ferric oxide is ≥300ppm, and the quartz sand tailings particles are initially crushed to 50-100 meshes, and the quartz sand tailings are removed For obvious impurities and foreign matter in the ore, wash the tailings with deionized water, and dry them at 200-300°C for 2-3 hours, so that the water content in the quartz sand tailings does not exceed 0.1%;

[0022] (2) Calcination: Mix 15g of solid sodium oxide into each ton of tailings, stir evenly, and use a temperature program to calcine at 500-1300°C. From the initial temperature to 500°C, the temperature rises by 8°C per minute, and from 500°C every minute Raise the temperature by 5°C, maintain at 650°C for 20 minutes, maintain at 1000°C for 20 minutes, and maintain at 1300°C for 20 minutes. 2 react to form Na 2 SiO 3 ;

[0023] (3) Water quenching-crushing: Use a high-pressure water p...

Embodiment 2

[0028] (1) Rough separation-cleaning-drying: Before purification, the silica content of quartz sand tailings is ≤95.0%, and the content of ferric oxide is ≥300ppm, and the quartz sand tailings particles are initially crushed to 50-100 meshes, and the quartz sand tailings are removed For obvious impurities and foreign matter in the ore, wash the tailings with deionized water, and dry them at 200-300°C for 2-3 hours, so that the water content in the quartz sand tailings does not exceed 0.1%;

[0029] (2) Calcination: Mix 12g of sodium oxide solid into each ton of tailings, stir evenly, and use temperature programming to calcine at 500-1300°C. From the initial temperature to 500°C, the temperature is raised by 6°C per minute, and from 500°C every minute Raise the temperature by 3°C, maintain at 650°C for 20 minutes, maintain at 1000°C for 20 minutes, and maintain at 1300°C for 20 minutes;

[0030] (3) Water quenching-crushing: Use a high-pressure water pump to rinse the quartz sa...

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Abstract

The invention discloses a processing purification technology for high-purity quartz sand tailings. The processing purification technology takes tailings in a process of producing high-purity quartz sand as raw materials and comprises the steps of roughing, cleaning, drying, calcining, water quenching, acid pickling, cleaning and drying, wherein sodium oxide is uniformly blended into the quartz sand tailings before calcining, and reacts with SiO2 at high temperature to generate soluble sodium silicate replacing hydrofluoric acid to open inclosure of quartz, so that contact reaction between metal impurities and acid is realized, and the usage amount of acid is greatly reduced. The processing purification technology is simple and environment-friendly, purification effect is good, deep processing on the quartz sand tailings is effectively realized, the purity of the quartz sand tailings treated by adopting the technology can reach up to 99.90% or above, and the standard of high-purity quartz sand is met.

Description

technical field [0001] The invention relates to the field of inorganic material processing, in particular to a process for processing and purifying high-purity quartz sand tailings. 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, among which the quartz sand that can be used in military industry, aerospace, optical fiber, chip, solar cell and other industries usually requires SiO 2 High-purity quartz sand with a content higher than 99.9%. [0003] Domestically, high-purity quartz sand is mostly made of high-quality raw materials such as crystal and vein quart...

Claims

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Application Information

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IPC IPC(8): C01B33/12
CPCC01B33/12C01P2006/80
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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