Method for producing architectural gypsum powder by using phosphogypsum

Abstract

This invention relates to a method for producing construction gypsum powder from ardealite. The method comprises: (1) prehomogenizing ardealite waste residue, placing in a continuous high-efficiency calcining kiln, and calcining; (2) taking out and aging naturally for 7-15 d; (3) milling into 100-200 mesh powder. This invention uses a unique calcination technique to produce high performance construction gypsum from ardealite waste residue, and has such advantages as no secondary pollution and saved water resource.

Description

technical field [0001] The invention belongs to the technical field of building materials, in particular to a method for producing building gypsum powder from phosphogypsum. Background technique [0002] Phosphogypsum is a waste residue produced during the production of phosphate fertilizers such as phosphoric acid and phosphoamido. In recent years, with the rapid development of high-concentration compound fertilizers and feed additives in China, the annual discharge of phosphogypsum is very large, about 30 million tons, which not only brings great pressure to the stacking of production enterprises, but also pollutes the environment. [0003] At present, the treatment and utilization of phosphogypsum is mainly to process it into a substitute for natural gypsum. However, since phosphogypsum contains a certain amount of impurities such as phosphoric acid, organic phosphorus, inorganic phosphorus, and fluorine, the traditional method of preparing gypsum powder, that is, the wa...

AI Technical Summary

Problems solved by technology

However, since phosphogypsum contains a certain amount of impurities such as phosphoric acid, organic phosphorus, inorganic phosphorus, and fluorine, the traditional method of preparing gypsum powder, that is, the washing method, can produce q