Method and system for preparing brine by using inferior raw material salt

Abstract

The invention discloses a method and system for preparing brine by using an inferior raw material salt. The method comprises the following steps: S1, carrying out salt dissolving; S2, carrying out impurity removal; and S3, carrying out clarification. The system comprises an original salt conveyor belt, a salt dissolving system, an impurity removal system and a solution preparation system. The method and system has the advantages that the inferior raw material salt is reasonably utilized, and through treatment by the method and system, the inferior raw material salt with a sodium chloride content of 50%-70% can be prepared into brine with light transmittance of greater than or equal to 50%, a sodium chloride content of greater than or equal to 305g / L, an SO4<2-> concentration of less than or equal to 10g / L, and an Mg<2+> concentration of less than or equal to 0.4g / L, so that production and use of a downstream alkali plant are met. Meanwhile, processing cost of brine is greatly reduced,processing cost can be reduced by 96% or above, limitation of the sodium chloride content of raw material salts on salt mining and processing is broken, the mining life of salt lakes is greatly prolonged, and sustainable development of mining of salt lakes is maintained.

Description

Technical field: [0001] The invention relates to the field of brine preparation, in particular to a method and system for preparing brine by using inferior raw material salt. Background technique: [0002] Salt lake is a kind of saltwater lake, which is rich in various salts and is an important mineral resource, mainly concentrated in western China. [0003] Jilantai Salt Lake covers an area of ​​120 square kilometers, of which the area of ​​salt mines is 37.19 square kilometers, with an exploration reserve of 114 million tons. There are potassium, magnesium and other rare and precious chemical elements, which have high industrial mining value. The lake salt is characterized by its large particles, It is well-known throughout the country for its strong taste, clear crystals, and few impurities. It produces more than 600,000 tons of high-quality lake salt every year. It is an important salt mine production base in Inner Mongolia. Jilantai Salt Lake is under the background of...

AI Technical Summary

Problems solved by technology

[0006] The sodium chloride content of these inferior raw material salts is generally 50%-70%. Sulfate ions, so that the preparation of brine can meet the production and use of downstream alkali plants (sodium chloride content ≥ 305g / L, SO 4 2- Concentration≤10g / L, Mg 2+ Concentration ≤ 0.4g / L), it needs to consume a lot of barium chloride, and barium chloride is an expensive chemical raw material, the market price of barium chloride is maintained at more than 3500 yuan / ton, resulting in high processing costs for brine making

Moreover, due to the use of barium chloride in the traditional brine making process, there are a large number of barium ions in the discharged sewage water. If it is discharged directly without treatment, it will seriously affect the environment, and even cause human poisoning, which is extremely harmful.

However, if this part of low-quality raw material salt is discarded, the mining life of Jilantai Salt Lake will be greatly shortened, and the sustainable development of Jilantai Salt Lake will be seriously restricted.

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