Method for controlling pH (potential of hydrogen) of ammonium sulphate solution prepared by phosphogypsum

Abstract

A method for controlling pH (potential of hydrogen) of ammonium sulphate solution prepared by phosphogypsum includes arranging a neutralizing tank, a phosphoric acid storage tank and a pump at the rear of an ammonium sulphate solution storage tank; pouring phosphoric acid in the phosphoric acid storage tank into the neutralizing tank; leading the phosphoric acid to be reacted with solution pouredinto the neutralizing tank from the ammonium sulphate solution storage tank; detecting the pH value of the solution after reaction by a pH detector on a bypass circulation tube of the neutralizing tank; and adjusting the adding quantity of the phosphoric acid to control the pH value of the solution within a range of 5.0-6.0, and controlling the qualified ammonium sulphate solution in the neutralizing tank to carry out a next procedure. Free ammonia and a small quantity of ammonium carbonate in the ammonium sulphate solution are neutralized by the phosphoric acid, and generated monoammonium phosphate is used as adhesive needed by a downstream granulation workshop. The method is simple, actual use proves that an effect is remarkable, the free ammonia of a system is recycled sufficiently, and the method provides a guarantee for reducing cost and increasing quality of products, and can be applied to the field of preparing ammonium sulphate by phosphogypsum.

Description

technical field [0001] The invention relates to the control of the pH value of the solution, in particular to a method for controlling the pH of the ammonium sulfate solution prepared from phosphogypsum. Background technique [0002] Phosphogypsum is the industrial waste residue produced when sulfuric acid is used to extract phosphate rock in the production of wet-process phosphoric acid. About 5 tons of phosphogypsum are discharged for every ton of phosphoric acid produced. It is also a sulfur-containing resource. Nowadays, most of the phosphogypsum waste residue is stored and landfilled. Disposal not only wastes resources and occupies land, but also has great harm to the environment. The effective utilization of phosphogypsum is an urgent problem to be solved in phosphorus chemical industry. Wengfu (Group) Co., Ltd. developed phosphogypsum ammonium sulfate to solve this problem. Phosphogypsum ammonium sulfate uses chemical by-products phosphogypsum, carbon dioxide, and amm...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a method for controlling the pH of the ammonium sulfate solution produced from phosphogypsum, so as to solve the technical problem that the pH value of the solution is too high in the production process of the ammonium sulfate produced from phosphogypsum

Images