A system for producing wet-process phosphoric acid and α-hemihydrate gypsum from phosphate rock

Abstract

This utility model relates to the field of chemical reaction technology, and in particular to a system for producing wet-process phosphoric acid and α-hemihydrate gypsum from phosphate rock, comprising: a reaction tank; a sulfuric acid inlet to the reaction tank; a crystallization tank connected to a first slurry outlet of the reaction tank; a sulfuric acid inlet to the crystallization tank; a dihydrate filter connected to a second slurry outlet of the reaction tank; a dihydrate gypsum outlet of the dihydrate filter connected to the dihydrate gypsum inlet of the crystallization tank; a hemihydrate gypsum filter connected to the slurry outlet of the crystallization tank; a washing water inlet to the hemihydrate gypsum filter; and a hemihydrate gypsum drying system connected to the hemihydrate gypsum outlet of the hemihydrate gypsum filter. This application, by adding a small amount of equipment to a dihydrate phosphoric acid production unit, can improve the extraction rate of wet-process phosphoric acid and co-produce hemihydrate gypsum, resulting in a system for producing wet-process phosphoric acid and α-hemihydrate gypsum from phosphate rock with a high total phosphorus yield, low phosphate rock consumption, and low energy consumption.

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