A technology for preparing calcium chloride by using waste slurry

Abstract

The invention discloses a technology for preparing calcium chloride by using waste slurry, which includes a hydrolysis process, a water washing separation process, a precision filtration process and a product process. The hydrolysis process includes a dissolving tank and a reaction kettle; the water washing and separation process includes centrifugal separation device; the precision filtration process includes a first filter device, a waste residue storage tank, and a second filter device; the product process includes a calcium chloride solution storage tank. The present invention adopts quicklime or slaked lime which is alkaline in contact with water, and absorbs the hydrogen chloride gas generated during the hydrolysis process of waste slurry, which not only effectively controls the overflow of hydrogen chloride gas, but also effectively avoids the environmental pollution caused by hydrogen chloride during the hydrolysis process of waste slurry, The cost of waste slurry treatment is reduced, and the efficiency of waste slurry treatment is improved.

Description

technical field [0001] The invention relates to the field of waste slurry treatment in the production process of methylchlorosilane monomer, in particular to a technology for preparing calcium chloride by utilizing waste slurry. Background technique [0002] The waste slurry produced during the synthesis of organosilicon monomers accounts for about 6%-10% of the monomer output. The waste slurry is mainly composed of disilane, disiloxane, siloxane, etc. whose boiling point is higher than 75°C, and also contains suspended silicon powder, copper, zinc, iron, tin and other metals. When the waste slurry is exposed to the air, it is easy to burn and to form acid mist. The treatment methods of waste slurry mainly include hydrolysis method and high temperature heat treatment method. The hydrolysis method is used to obtain inert, non-adherent and easily separable hydrolyzate particles and a hydrolyzate solution that meets the discharge standard through hydrolysis treatment; the hig...

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Problems solved by technology

[0004] In order to overcome the defects of air pollution, water pollution, unstable operation of the treatment system, low safety factor and high treatment cost in the process of waste slurry treatment in the prior art, the present invention provides a technology for preparing calcium chloride by using waste slurry, During the hydrolysis process, quicklime or slaked lime that is alkaline in contact with water is used to fully absorb the hydrogen chloride gas generated during the hydrolysis process of the waste slurry, which not only effectively controls the overflow of hydrogen chloride gas, but also recovers the chlorine element in the waste slurry, effectively avoiding Hydrogen chloride causes environmental pollution during the hydrolysis of waste slurry, which also reduces the cost of waste slurry treatment and improves the efficiency of waste slurry treatment

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