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Method for producing purified high-whiteness quartz sand and silica micropowder from quartz sand tailings

A production method and technology of quartz sand, applied in the direction of silicon oxide, silicon dioxide, etc., can solve the problem of not being scientifically used, and achieve the effect of promoting comprehensive utilization, saving cost and achieving ideal effect.

Inactive Publication Date: 2014-08-13
临沂晟泉矿业有限公司
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Problems solved by technology

At present, except for a small amount of these tailings used as raw materials for water glass and ceramics, most of them have not been used scientifically.

Method used

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Embodiment Construction

[0040] The method for purifying high-white quartz sand by using quartz sand tailings comprises the following steps:

[0041] 1. Sediment separation: The quartz tailings are separated by magnetic separation and hydraulic classification. Before discharge, the tailings enter the hydrocyclone for desliming, and then are washed with clean water, magnetically separated, and dehydrated for later use.

[0042]2. Acid leaching: Add the tailings separated from the sediment into the acid leaching tank with stirring and heating, and then add the mixed solution of hydrochloric acid, sulfuric acid, and nitric acid. The ratio of the three acids of hydrochloric acid, sulfuric acid, and nitric acid is: 2: 2:1. The concentration of the slurry (solid-to-liquid ratio) is 50%, the acid leaching temperature is 100°C, and the stirring is continued. The acid leaching time is 18 hours. 7.

[0043] 3. Oxidation and alkali washing: the material after pickling is evenly added with a concentration of 9%...

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Abstract

The invention discloses a method for producing purified high-whiteness quartz sand and silica micropowder from quartz sand tailings. According to the method, mud-sand separation, acid leaching, oxidation alkali washing, drying and screening are carried out so as to produce purified high-whiteness quartz sand from quartz sand tailings; a product which is still unqualified after purification is subjected to grinding and grading to produce silica micropowder; so full utilization of resources is realized. According to detection results, after purification, the indexes of the quartz sand tailings are that SiO2 is 99.2 to 99.5% and Fe2O3 is 0.002 to 0.012%, and whiteness is improved by more than 11%. The high-whiteness quartz sand can replace high-grade konilite and be used in industries like alkali-free electronic glass fibers, high-grade ceramic glazes, silica micropowder, vacuum glass tubes, high-whiteness glass and high-grade sodium metasilicate.

Description

technical field [0001] The invention belongs to the technical field of quartz sand production, and in particular relates to a production method for purifying high-white quartz sand and silicon micropowder by using quartz sand tailings. Background technique [0002] Quartz is the main component of siliceous raw materials such as quartz sand, quartz sandstone, quartz stone, and vein quartz. It is widely used in many industrial sectors because of its excellent physical and chemical properties. With the rapid development of industrialization in our country, the demand for quartz is increasing year by year, so the mining scale of silicon raw materials is getting larger and larger, and many quartz sand concentrators have been built and put into operation in some areas rich in quartz resources. The launch of a large number of quartz beneficiation projects has made a positive contribution to alleviating the urgent demand for silicon raw materials in various industries, and has also ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12
Inventor 赵祥
Owner 临沂晟泉矿业有限公司
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