Method for detecting solid content of slurry

Abstract

The invention discloses a method for detecting the solid content of slurry so as to overcome the defects in the prior art. The method comprises the following steps: a, performing centrifugal treatment on a stirred chlorosilane slurry sample by a centrifugal machine; b, purging the residual volatile chlorosilane liquid by introducing nitrogen; and c, weighing the weight of the residual solid to obtain the solid content of the slurry. According to the method for detecting the solid content of the chlorosilane slurry in a cold hydrogenation process provided by the invention, the chlorosilane slurry and the chlorosilane liquid are separated by the centrifugal machine and then are treated, so the detection time is greatly shortened. The detection method is simple and convenient to operate, clean, safe and insusceptible to environmental pollution; furthermore, a polytetrafluoroethylene centrifugal test tube is insusceptible to corrosion, and cleaning and maintenance of appliances, such as the centrifugal test tube and the like, are facilitated after detection is finished.

Description

technical field [0001] The invention belongs to the field of polysilicon production detection, and in particular relates to a method for detecting the solid content of liquid-solid mixed raw material chemical slurry which is flammable, explosive, highly volatile, highly corrosive and sensitive to moisture. Background technique [0002] During the production of polysilicon by the traditional Siemens method, more than 20 tons of silicon tetrachloride are by-produced per ton of product. The large number of by-products restricts the large-scale development of polysilicon. The cold hydrogenation technology of silicon tetrachloride solves this problem and converts tetrachloride Silicon is converted into trichlorosilane as a raw material for recycling, so larger-scale 10,000-ton polysilicon devices have emerged. However, the existing cold hydrogenation technology is still imperfect, and there are many problems to be solved. Among them, the discharge and treatment of the slurry duri...

AI Technical Summary

Problems solved by technology

[0004] The problem solved by the present invention is to centrifugally process the chlorosilane slurry in the cold hydrogenation process with a centrifuge, then dry the chlorosilane mixed in the slurry with nitrogen, and then weigh it after drying. The mass fraction of the original sample mass is used as the solid content of the slurry. This method has a short detection time, is easy to operate, clean, safe, and is not easy to pollute the environment. The PTFE centrifuge tube is not easy to corrode, and it is convenient to centrifuge the test tube after the test. Equipment cleaning and maintenance

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