Method for fluorine separation and recovery from phosphate rock enhanced with microbubble coupled silicon additive

Abstract

The present application provides a method for fluorine separation and recovery from phosphate rock enhanced with a microbubble coupled silicon additive, which includes: mixing the phosphate rock, phosphoric acid, and an active silicon additive, and subjecting the mixture to reaction to obtain a slurry; subjecting the slurry to microbubble generation treatment to obtain a microbubble slurry, and subjecting the microbubble slurry to recycling and returning to the reaction, where a released volatile fluoride is recovered; and after completing the reaction, a defluorinated slurry is obtained; and subjecting the obtained defluorinated slurry to acid-decomposition reaction and then solid-liquid separation to obtain phosphoric acid and phosphogypsum. In the method provided by the present application, a synergistic effect of microbubbles and the active silicon additive is used in the phosphoric acid acid-decomposition of phosphate rock, enhancing the fluorine impurities in phosphate rock to convert into volatile fluoride SiF4 and HF, achieving the highly efficient separation and recovery of fluorine, and a recovery rate of fluorine reaches 43.9% or more; moreover, the fluorine impurities are separated from the source in the acid decomposition of phosphate rock, thereby preventing fluorine from entering the subsequent wet phosphoric acid process.

Dependencies are inferred from the claim text.