Method for producing potassium bicarbonate through self-carbonization multiple-effect cross flow continues evaporation crystallization

Abstract

The invention discloses a method for producing potassium bicarbonate through self- carbonization multiple-effect cross flow continues evaporation crystallization, comprising the following steps: mixing a potassium bicarbonate ion exchange solution containing ammonium bicarbonate with a potassium bicarbonate mother solution containing potassium carbonate to obtain a mixed feed liquid; preheating the feed liquid, then putting the preheated feed liquid into a desorption self-carbonization tower to carrying out low temperature desorption self-carbonization; letting the feed liquid flowing out from the desorption self-carbonization tower successively enter an III-effect evaporator, an II-effect evaporator, an I-effect evaporator and an IV-effect evaporator for processing to obtain a solid-liquid mixture; separating the obtained solid-liquid mixture by a centrifugal machine to obtain potassium bicarbonate crystals and a potassium bicarbonate mother liquid containing potassium carbonate; drying and sieving the potassium bicarbonate crystals by a drying machine, and then packaging and putting in storage; and respectively putting the potassium bicarbonate mother liquid containing potassium carbonate into the II-effect evaporator and a liquid storage tank II. According to the invention, the energy consumption in the process of potassium bicarbonate evaporation can be remarkably reduced, and the particle size in the crystallization of potassium bicarbonate and the product quality are improved or controlled.

Description

technical field [0001] The invention relates to the technical fields of chemical industry, resource and environment, in particular to a method for producing potassium bicarbonate by self-carbonization multi-effect cross-flow continuous evaporation and crystallization. Background technique [0002] Potassium bicarbonate is an important chemical raw material, mainly used to produce potassium carbonate, potassium acetate, potassium arsenite, etc. It is also used in medicine, food, agriculture and fire extinguishing agent industries. Potassium bicarbonate has been widely used in recent years It is used as a food loosening agent and quality improver, and its development is getting more and more attention. Potassium bicarbonate is the raw material for the production of potassium carbonate. Potassium carbonate is widely used in chemical industry, light industry, picture tube glass bulb, pharmaceutical, food, welding rod and non-ferrous metal metallurgy and other industries. Therefo...

AI Technical Summary

Problems solved by technology

The downstream evaporation plus continuous evaporation and crystallization process solves the corrosion problem of the first-effect evaporator due to the harsh operating environment of high temperature and high concentration, but it does not solve the problem of high steam consumption.

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