METHOD AND SYSTEM FOR CONCENTRATING FLUOSILICIC ACID SOLUTION

The present invention relates to the technical field of fluorosilicic acid preparation and particularly to a method and system for concentrating a fluosilicic acid solution. The method for concentrating a fluosilicic acid solution comprises the following steps: mixing fluorine-containing waste gas and the fluosilicic acid solution in a first washing area, and performing primary washing; conveying a washing liquid after the primary washing to a second concentration area; conveying SiF4 gas to a first concentration area and performing primary washing concentration; conveying SiF4 gas after the primary washing concentration to a second concentration area and performing secondary washing concentration; allowing a washing concentrated liquid in the second concentration area to flow back to the first concentration area; filtering the washing concentrated liquid in the first concentration area to obtain a concentrated fluosilicic acid solution and fluorine-containing silicon slag; and conveying waste gas after the s