Wet decomposition evaporation alkali production technique for NaHCO3 alkali halide

Abstract

The invention discloses an alkali preparing process for wetly decomposing and evaporating alkali halide containing NaHCO3, which comprises the following steps: adding purified brine in the refining process into a clear liquid storage tank; successively adding the brine into a first effective wet decomposition evaporator, a second effective wet decomposition evaporator, a third effective evaporator and a fourth effective crystallizer after the brine is sent to a primary preheater, a secondary preheater and a tertiary preheater in sequence by using a purified brine pump; and obtaining a crystal in the fourth effective crystallizer; and then sending the crystal to the filtering process. Primary steam used by the first effective wet decomposition evaporator adopts back pressure steam of 0.45 MPa (absolute pressure); condensed water generated after being preheated by a primary clear liquid preheater is returned to a boiler; secondary steam generated by each effective evaporator is used as a next effective heat source; and secondary steam generated during the fourth effective evaporation process is emptied after passing through a surface condenser. By adopting the production technology of the wet decomposition and evaporation process, the process flow of natural alkali preparing pure alkali is shortened, the production cost is reduced, the problem of environmental pollution in the traditional art is solved, and the production of the pollution-free natural alkali preparing pure alkali is achieved.

Description

Technical field [0001] The present invention relates to the field of soda making technology, more specifically, relates to a kind of 3 Alkali brine wet decomposition evaporation alkali production process. Background technique [0002] After Tongbai Anpeng soda mine was discovered in Henan Oilfield in the early 1980s, detailed exploration was carried out, and a 10kt / a heavy soda ash pilot plant was built in 1990. The monohydrate soda processing technology, that is, the causticization method, was used to produce light caustic lye. Neutralization of NaHCO in brine 3 , Evaporate and crystallize to obtain alkali monohydrate, separate and calcinate to obtain heavy soda ash. After 7 years of experiments, 47,000 tons of soda ash were produced, and 50,000 tons of caustic mud (on a dry basis) were produced at the same time. Three large ponds were piled up, which seriously polluted the environment and could not be expanded. The cost of this process is high, and a large amount of cau...

AI Technical Summary

Problems solved by technology

After 7 years of experiments, 47,000 tons of soda ash were produced, and 50,000 tons of caustic mud (on a dry basis) were produced at the same time. Three large pools were piled up, which seriously polluted the environment and could not be expanded.

The cost of this process is high, and a large amount of causticized mud will be produced in the production process, which will seriously pollute the environment

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