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Processing and recycling process for silicon slurry

A silicon slag and process technology, applied in the field of silicon slag slurry treatment and recovery process, can solve the problems of limited direct sales channels, inability to discharge directly, and restriction of normal operation of organic silicon monomer devices, so as to achieve good economic benefits and eliminate pollution , the effect of protecting the environment

Pending Publication Date: 2011-09-07
上海竟茨环保科技有限公司
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Problems solved by technology

These by-products cannot be discharged directly because they contain harmful ingredients; however, the channels for direct sales are limited, which restricts the normal operation of organic silicon monomer units

Method used

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  • Processing and recycling process for silicon slurry
  • Processing and recycling process for silicon slurry
  • Processing and recycling process for silicon slurry

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Embodiment Construction

[0018] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0019] see figure 1 , figure 2 , the specific steps of the treatment and recovery process of the silicon slag slurry of the present invention are that the silicon slag slurry is transported to a closed equipment (which can be realized by a rotary kiln) to evaporate and carry out gas-solid separation, and the gas produced by the evaporation is condensed to obtain high boilers . The high boiler adopts cracking catalytic technology, under the action of iron powder catalyst, the high boiler reacts with hydrogen chloride to crack monomethyl trichlorosilane, trimethyl monochlorosilane, monomethyl hydrogen silane and dimethyl dichlorosilane And other mixed monomers, each pure monomer product can be obtained by fractional distillation. The solid separated by evaporation mainly contains cuprous oxide, silicon and silicon dioxide, etc., adding hydr...

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Abstract

The invention provides a processing and recycling process for silicon slurry, which comprises the steps as follows: silicon slurry is evaporated for gas and solid separation; high boiling point substances are obtained after the gas phase is condensed; the high boiling point substances react with hydrogen chloride to be cracked into mixed monomers such as methyl trichloro silicane, trimethyl chloro silicane, methyl silane, dimethyl dichloro silicane and the like; and after the fractionation, each pure monomer product can be obtained. The solid phase separated through evaporation mainly contains cuprous oxide, silicon, silicon dioxide and the like; hydrochloric acid (or sulfuric acid) is added into the solid phase to extract copper chloride (or copper sulfate, which can be sold directly) by a chemical method; and silicon and silicon dioxide are separated out. Iron powder is added into a copper chloride solution for extracting copper and ferrous chloride, and sodium hydroxide is added into the ferrous chloride solution for extracting ferrous oxide. The processing and recycling process is environment-friendly and can eliminate pollution, and meanwhile can recover various by-products from silicon slurry, thereby having well economic benefits.

Description

technical field [0001] The invention relates to a chemical process, in particular to a treatment and recovery process for silicon slag slurry. Background technique [0002] In the monomer synthesis production process of organosilicon equipment, there are by-products of high boilers, azeotropes and silicon slurry, which contain useful substances such as Si, Cu and organosilicon monomers and other harmful components. Calculated on the basis of a 70,000-ton / year organosilicon plant, the annual output is about: ~4,000 tons of rectified high boilers, about 1,200 tons of azeotropes, and 3,000 tons of silicon slurry. Because these by-products contain harmful components, they cannot be discharged directly; however, the channels for direct sales are limited, which restricts the normal operation of organic silicon monomer units. Contents of the invention [0003] The object of the present invention is to provide a treatment and recovery process for silicon slag in order to solve th...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B15/00C01G49/04C01B33/021C07F7/12C07F7/08
CPCY02P10/20
Inventor 桑国仁麦晖史长涛夏柳春
Owner 上海竟茨环保科技有限公司
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