Fluosilicic acid concentration method and device

Abstract

The invention relates to a fluosilicic acid concentration method and device and solves the technical problems of slightly low concentration and high impurity content of existing fluosilicic acid. The fluosilicic acid concentration device is provided with separation equipment used for separating silica gel in fluosilicic acid, heating equipment used for heating air, concentration equipment used for concentrating the fluosilicic acid and purification equipment used for removing arsenic and mechanical impurities; the front end of the concentration equipment respectively communicates with the separation equipment and the heating equipment; and the rear end of the concentration equipment communicates with the purification equipment. The fluosilicic acid concentration device can be widely applied to concentration and recovery of low-concentration fluosilicic acid.

Description

technical field

[0001] The invention relates to a method and device for concentrating compounds containing silicon, fluorine and other elements, in particular to a method for concentrating and recovering low-concentration fluorosilicate by-products in the phosphoric acid production process in the phosphate fertilizer industry, or for extracting low-concentration fluorosilicate from other industries. concentrated recovery. Background technique

[0002] In the production process of wet-process phosphoric acid, the phosphate rock used contains 2.5-3.0% fluorine. During the process of decomposing phosphate rock with concentrated acid, silicon tetrafluoride gas is produced, most of which are directly absorbed by the reaction liquid phase to form various fluorides. , into dilute phosphoric acid or phosphogypsum. About 10% of silicon tetrafluoride gas will escape from the reaction liquid phase, and after multi-stage water washing and absorption, it will generate 5-25% low-concentr...

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