Method for producing granular monoammonium phosphate

Abstract

The invention discloses a method for producing granular monoammonium phosphate, which comprises the following steps: producing filter residue and mother liquor in a crystal phosphorus ammonium process from extractive spent acid obtained by phosphoric acid purification; mixing the mother solution, the filter residue and dilute phosphoric acid in a ratio of 10:15:100 in an ammonifying reactor, thereby producing a monoammonium phosphate slurry, wherein the density is controlled at 1.28-1.33g / l, the neutralization degree of the slurry is controlled at 1.05-1.25 by the ammonifying reaction, and the density of the slurry prepared by concentration is controlled at 1.40-1.46g / l; and granulating, drying, screening, pulverizing, cooling the product and the like to obtain the granular monoammonium phosphate product. The granular MAP product produced by the method enhances the adaptability of the granular MAP slurry process device to raw materials, lowers the production cost, enhances the economic benefit of the enterprise, sufficiently recycles phosphorus and nitrogen, and is suitable for technical reconstruction of phosphorus ammonium manufacturers.

Description

technical field [0001] The invention relates to the production field of phosphorus chemical products, in particular to the production of granular monoammonium phosphate products by using mother liquor and filter residue in phosphorus fine chemical production. Background technique [0002] In the process of wet-process phosphoric acid purification raffinate used in the production of crystalline ammonium phosphate, there are often filter residues rich in a large amount of metal ions and part of the mother liquor that cannot be discharged directly. Otherwise, nitrogen and phosphorus waste discharge will pollute the environment. Therefore, make full use of the existing production equipment, recycle phosphorus and nitrogen waste, turn waste into treasure, use it to produce low-nutrient ammonium phosphate, improve nitrogen and phosphorus utilization, and do not discharge waste into the environment, which not only realizes circular production, but also protects the environment. en...

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Problems solved by technology

[0003] After searching, in the Chinese patent database and other databases, there is currently no information about the method of using the raffinate obtained by phosphoric acid purification to produce crystalline ammonium phosphate filter residue and mother liquor to produce granular monoammonium phosphate

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