Process for producing potassium phosphate with wet phosphoric acid

Abstract

The invention relates to a process for producing potassium phosphate with wet phosphoric acid. The process comprises the following steps that: 1) wet phosphoric acid is put into an ultrasonic reactor for ultrasonication at the temperature of 2-80 degree centigrade with the reaction time of 10-120 minutes; then the product is cooled to be at room temperature and precipitates are leached, thus obtaining a filter liquor; 2) potassium hydroxide, potassium carbonate or potassium bicarbonate is used to regulate the PH value of the filter liquor and generate precipitates, and a new filter liquor obtained after filtering is concentrated, evaporated, crystallized and then separated, thus obtaining potassium phosphate. The process is characterized in that wet phosphoric acid with low purity, purity and cost, lead-bearing material and potassium chloride are used as raw materials to react and generate potassium phosphate, which reduces production cost. Impurities in the raw materials interact and generate insoluble precipitates, and the insoluble precipitates can be easily separated. In the simple process, products are generated only by concentrating and crystallizing a neutralizer; potassium phosphate is directly prepared by utilizing phosphoric acid with the concentration of 5-40%, which solves the problems of low consistency of wet phosphoric acid and high energy consumption for concentration.

Description

technical field [0001] The invention relates to a process for producing potassium phosphate salt with wet-process phosphoric acid. Background technique [0002] Potassium phosphate in China is usually produced by neutralization, concentration and crystallization of thermal phosphoric acid or refined phosphoric acid and potassium hydroxide or potassium carbonate, and the production cost is relatively high. Wet-process phosphoric acid and potassium chloride with lower production costs are used instead of hot-process phosphoric acid to produce potassium phosphate, and wet-process phosphoric acid must be pretreated. Existing wet-process phosphoric acid purification methods such as solvent extraction, ion exchange, and electrodialysis have disadvantages: large equipment investment; complicated operation; and high purification costs. Contents of the invention [0003] The problem to be solved by the present invention is to propose a kind of technology that uses wet-process phos...

AI Technical Summary

Problems solved by technology

The existing wet-process phosphoric acid purification methods such as solvent extraction, ion exchange, and electrodialysis have disadvantages: large equipment investment; complicated operation; high purification cost, etc.