Preparation method of phosphogypsum-based lightweight baking-free bricks

Abstract

The invention discloses a preparation method of phosphogypsum-based lightweight baking-free bricks, and belongs to the technical field of building material. The preparation method comprises followingsteps: phosphogypsum and absolute ethyl alcohol are subjected to ball milling mixing so as to obtain a ball milling material, concentrated sulfuric acid is added into the ball milling material at a constant temperature with stirring, constant temperature stirring reaction is carried out, a calcium salt solution is added, the pH value is adjusted, and then hydro-thermal stirring reaction, concentration, and drying are carried out so as to obtain pre-treated phosphogypsum; the pre-treated phosphogypsum, a sodium silicate solution, and microcrystalline cellulose are mixed and stirred to be uniform so as to obtain a mixture A, ethylene acetate, isocyanate, and organic tin catalyst are mixed and stirred to be uniform so as to obtain a mixture B; the mixture B is added into the mixture A at a constant temperature with stirring drop by drop, after dropwise adding, constant stirring reaction is carried out, and after reaction, pressing moulding and curing are carried out so as to obtain the phosphogypsum-based lightweight baking-free bricks. The phosphogypsum-based lightweight baking-free bricks possess excellent mechanical properties, and cracking is not easily caused.

Description

technical field [0001] The invention discloses a preparation method of a phosphogypsum-based lightweight unburned brick, belonging to the technical field of building materials. Background technique [0002] Using fly ash, coal cinder, coal gangue, tailings slag, chemical slag or natural sand, sea mud, etc. (one or more of the above raw materials) as the main raw materials, a new type of wall material manufactured without high-temperature calcination is called It is unburned brick. This product is in line with the general policy of building materials development of "protecting farmland, saving energy, adapting measures to local conditions, and using local materials", in line with the "opinions on strictly restricting the destruction of fields and burning bricks and actively promoting the reform of walls", in line with the "continuing comprehensive utilization of some resources products, etc. Notice on the Implementation of Preferential Value-Added Tax Policies", this product...

AI Technical Summary

Problems solved by technology

[0005] The main technical problem to be solved by the present invention is that it is difficult to have both the mechanical properties and light weight effect of traditional unburned bricks, especially because of the extensive use of inorganic minerals or waste materia