Silicon dioxide production sewage treatment system and method

Abstract

The invention discloses a silicon dioxide production sewage treatment system. The system comprises a rapid neutralizing channel, a calcium carbonate slow-release tank, a first sedimentation tank, a magnesium silicate pre-slow-release tank, a second sedimentation tank, a plurality of magnesium silicate treatment tanks and a third sedimentation tank which are communicated in sequence; calcium carbonate blocks for removing acid radical ions in the silicon dioxide production sewage are contained in the rapid neutralizing channel and the calcium carbonate slow-release tank; magnesium silicate blocks used for removing fluorine ions in the silicon dioxide production sewage are contained in the magnesium silicate pre-slow-release pool and each magnesium silicate treatment tank, and flowing water gaps facilitating flowing of the silicon dioxide production sewage are reserved between the calcium carbonate blocks and between the magnesium silicate blocks. The system is reasonable in design and simple, convenient and effective to use, the silicon dioxide production sewage can reach the discharge standard through two-step treatment of calcium carbonate and magnesium silicate, the silicon dioxide production sewage can be recycled, and the treatment problem of the silicon dioxide production sewage is effectively solved.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a silica production sewage treatment system, and also relates to the above-mentioned silica production sewage treatment method. Background technique [0002] The chemical formula of silicon dioxide is SiO2. There are two forms of silicon dioxide, crystalline and amorphous. The silicon dioxide that exists in nature, such as quartz and quartz sand, is collectively called silica. Pure quartz is a colorless crystal, and silicon dioxide is widely used. , Mainly used for making glass, sodium silicate, pottery, enamel, refractory materials, airgel felt, ferrosilicon, molding sand, elemental silicon, cement, etc. [0003] At present, with the development of science and technology, there are more and more applications of smart chips, and chips are mainly made of monocrystalline silicon, which is made of high-purity silicon dioxide. Therefore, more and more companies are now using...

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Problems solved by technology

[0004] In the silica purification process, a large amount of sewage will be produced, which will contain a large amount of acid radical ions and fluoride ions, which are difficult to remove. In the prior art, calcium hydroxide is generally used to treat the silica production sewage , but calcium hydroxide is slightly soluble in water, it is difficult to control the amount and time of addition, and the consumption of calcium hydroxide is large, and the treatment cost is high. At present, there is a lack of a more effective and reasonable silica sewage treatment method

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