Manufacturing method of phosphogypsum ball

Abstract

The present invention relates to a preparation method of phosphogypsum sphere which can be substituted for natural gypsum in cement industrial. Said method includes the following steps: (1), raw material selection: selecting naturally dried rejected material of phosphate fertilizer plant, screening, removing impurity, its grain size is less than 10mm; (2), adding modifying agent alkaline substance, uniformly mixing them, drying in drying kiln, in the drying process making the impurities of water, water-soluble phosphorus pentoxide, sulfate radical and phosphate radical be volatilized; and (3), pressing sphere and forming.

Description

technical field

[0001] The invention relates to a method for making phosphogypsum balls used in the cement industry to replace natural gypsum. Background technique

[0002] As an additive in cement, gypsum can regulate the setting time and stimulate the activity of cement in cement. Natural gypsum needs to be crushed during the application process, which takes a lot of labor and electricity, which increases the production cost, and the content of sulfur trioxide is low.

[0003] Phosphogypsum is a by-product of wet-process phosphoric acid production. It has been recognized by many manufacturers to replace natural gypsum to produce cement. The manufacturing method of the phosphogypsum balls in the prior art is the disk pelletizing method, and its water content is above 15%, which will increase the cost in cement production. Contents of the invention

[0004] The purpose of the present invention is to provide a m...