Salt lake brine filtering method

Abstract

The invention relates to a salt lake brine filtering method. The method comprises the following steps: (1) conveying salt lake brine exposed to the sun from a salt pan into a first-stage brine filtering system for filtering to obtain first-stage filtered brine; (2) introducing steam into a dilution water heating mechanism in a second-stage brine filtering system so as to heat dilution water, thenblending the heated dilution water and the first-stage filtered brine for diluting, and conveying to a second-stage brine filtering mechanism for filtering so as to obtain second-stage filtered brine;(3) conveying the second-stage filtered brine into a third-stage brine filtering system for filtering to obtain third-stage filtered brine; and (4) conveying the third-stage filtered brine into a fourth-stage brine filtering system for filtering to obtain fourth-stage filtered brine. According to the method, the content of particulate matters such as silt and suspended matters in the salt lake brine is remarkably reduced, and the salt lake brine is prevented from crystallizing at low temperature, so that the purified salt lake brine with relatively low turbidity can be prepared.

Description

technical field [0001] The invention relates to the field of salt lake brine mineral processing, in particular to a method for filtering salt lake brine. Background technique [0002] Saturated magnesium chloride brine is an important raw material for producing salt lake brine battery-grade lithium carbonate, and its production process requires higher turbidity of magnesium chloride brine. Unfiltered magnesium chloride brine often contains impurities such as colloid, iron and organic matter, and cannot be directly used in the production process. Therefore, in order to ensure that the turbidity of the magnesium chloride brine meets the requirements of the production process, it is necessary to select a suitable filtration method to filter the magnesium chloride brine. [0003] Magnesium chloride brine itself has high turbidity and high viscosity. In the production process, with the change of seasonal temperature, the saturated magnesium chloride brine is prone to crystalliz...

AI Technical Summary

Problems solved by technology

In the production process, with the change of seasonal temperature, the saturated magnesium chloride brine is prone to crystallization, and the crystals will condense on the surface of the filter equipment, resulting in a decrease in the filtration performance of the filter device, so that the turbidity of the filtered magnesium chloride brine cannot be guaranteed to reach the production process Require

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