A method for producing industrial grade and battery grade monoammonium phosphate with fertilizer grade monoammonium phosphate

Abstract

The invention discloses a method for producing industrial first-stage and battery-stage monoammonium phosphate by using fertilizer-stage monoammonium phosphate. The fertilizer-stage monoammonium phosphate is heated and dissolved by pure water and is then filtered; then, decolorizing agents and precipitants are added into filter liquid; after the pH value is regulated to a certain value, filtration is performed; filter liquid a is obtained; the filter liquid a is heated and concentrated and is then cooled for crystallization; after drying, the industrial first-stage monoammonium phosphate is obtained; if the precipitants are continuously added into the filter liquid a, filtering is performed after the pH value regulation; then, impurity removal medicaments are added into the filter liquid; still standing is performed; after impurities are separated out, filtering is performed; cooling crystallization is performed after the filter liquid is heated and concentrated; drying is performed; then, the battery-stage monoammonium phosphate is obtained. The powdery fertilizer-stage monoammonium phosphate with high impurity content and low price is used for producing the industrial first-stage and battery-stage monoammonium phosphate; in addition, three wastes in the production are totally recovered for fertilizer production; the process is reliable; the equipment is simple; the production safety is high; the energy is saved; the consumption is reduced; the production cost is greatly reduced.

Description

technical field [0001] The invention relates to a method for purifying powdered chemical fertilizer monoammonium phosphate, in particular to a powdery chemical fertilizer monoammonium phosphate containing more impurities such as sulfur, iron, magnesium, aluminum, manganese, titanium, etc. Monoammonium Phosphate method. Background technique [0002] As a compound with high nitrogen and phosphorus content, monoammonium phosphate is widely used in agricultural production, but fertilizer monoammonium phosphate is a low-end product with low added value. With the oversupply of phosphate fertilizer production in the world, market competition has intensified, and fertilizer monoammonium phosphate The profit margin of ammonium is further reduced, so it is imminent to expand new application fields of fertilizer ammonium dihydrogen phosphate, especially low-cost fertilizer monoammonium phosphate. Compared with low-end fertilizer monoammonium phosphate: industrial grade monoammonium ph...

AI Technical Summary

Problems solved by technology

The raw material used in this method is agricultural crystalline monoammonium phosphate, and the raw material cost is relatively high; and the method utilizes resin treatment, and the resin consumption is large, and regeneration is troublesome, and the process is long, the production speed is slow, and the cost is high, so it is not suitable for industrial production

Chinese patent CN105819414A reports a production process of battery-grade monoammonium phosphate, which mainly uses a certain proportion of phosphoric acid solution containing less impurities to neutralize with ammonia, adjusts a certain pH, and then obtains battery-grade monoammonium phosphate through cooling and crystallization. However, the purity of phosphoric acid used in this process is high, so the production cost is high, and the general battery-grade monoammonium phosphate is mainly generated by the reaction of high-purity thermal phosphoric acid and ammonia. Although the production process equipment is simple, the equipment and technology requirements are high, and the production is dangerous. Big, heavy pollution, high energy consumption;