A kind of silicon dioxide preparation method and prepared silicon dioxide

Abstract

The invention discloses a method for preparing silicon dioxide, which comprises the following steps: 1) adding the pulverized silicon slag to an acidic solution for pickling to remove impurities from the silicon slag; 2) adding the silicon slag after removing impurities to a super The pure water is heated to the target temperature and stirred, and the target temperature is the temperature at which silicon can react with ultrapure water to obtain xSiO 2 ·yH 2 O solution, wherein, x>y; 3) xSiO 2 ·yH 2 The O solution, where x>y, is placed in a container containing several grooves, and calcined at high temperature to obtain a finished product of high-purity silica. The invention also discloses a silicon dioxide, which is prepared according to the above-mentioned preparation method. The silicon dioxide preparation method of the present invention uses silicon slag as a raw material, which can prevent the silicon slag from polluting polysilicon and the working environment, and can effectively utilize the silicon slag to save resources.

Description

technical field [0001] The invention belongs to the technical field of silicon dioxide, and in particular relates to a method for preparing silicon dioxide. Background technique [0002] At present, high-purity silica has been used in many fields. Unimin in the United States uses quartz ore to produce SiO 2 High-purity quartz sand with a content of 99.999% almost monopolizes the entire high-purity quartz sand market. my country's quartz sand resource reserves are very rich, but the domestic production technology level is not high, and the quality of the quartz sand produced is not high. With the development of high-tech in my country, the demand for high-purity quartz sand will also increase greatly. In order to break the foreign technology monopoly, it is necessary to improve the industrial production technology level of domestic high-purity quartz sand. [0003] The preparation of high-purity silica is divided into two types: natural method and synthetic method. The na...

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Problems solved by technology

[0004] Polysilicon is the most basic material for semiconductors, solar photovoltaic cells, and integrated circuits. In the production of polysilicon, some fine particle silicon slag will be produced, and these silicon slags cannot meet customer needs in size, so they cannot be sold normally and effectively utilized.

At the same time, these fine silicon residues will not only pollute the working environment, but also pollute qualified products.

In the actual production process, in order to prevent the pollution of polysilicon and the working environment, these silicon powders are simply collected and not used effectively, resulting in a certain waste of resources

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