Technology for preparing calcium chloride by using waste slurry

Abstract

The invention discloses a technology for preparing calcium chloride by using waste slurry. The technology comprises a hydrolysis process, a water-washing separation process, a precision filtration process and a product process, wherein the hydrolysis process comprises a dissolution tank and a reaction kettle; the water-washing separation process comprises a centrifugal separation apparatus; the precision filtration process comprises a first filtration apparatus, a waste slag storage tank and a second filtration apparatus; and the product process comprises a calcium chloride solution storage tank. According to the technology, quick lime or slaked lime which is alkaline in water is adopted to absorb hydrogen chloride gas generated by the hydrolysis process of the waste slurry, the overflow of the hydrogen chloride gas is effectively controlled, the problem of environmental pollution caused by hydrogen chloride in the waste slurry hydrolysis process is effectively avoided, the treatment cost of the waste slurry is reduced, and the waste slurry treatment efficiency 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 using waste slurry. Background technique [0002] The waste slurry generated during the synthesis of organosilicon monomer accounts for about 6%-10% of the monomer output. The waste slurry is mainly composed of disilane, disiloxane, and siloxane with a boiling point greater than 75°C, and also contains suspended silicon powder, copper, zinc, iron, tin and other metals. The waste slurry is exposed to the air and is easy to burn and 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-adhesive, easy-to-separate hydrolyzate particles and hydrolyzed solution that meet the discharge standards through hydrolysis treatment; the high-temperature heat tr...

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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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