A technology for producing high-strength gypsum by natural gypsum dry method

Abstract

The invention discloses a process for producing high-strength gypsum by using natural gypsum dry method. Firstly, the natural gypsum is broken into 0.01-0.5cm particles, and then put into an autoclave, at a temperature of 50-500°C and a pressure of 0.01-0.5mpa. Under airtight steaming for 1-9 hours, the attached water and crystallization water evaporate, forming saturated steam pressure in the kettle, and completing the steaming and crystallization process of gypsum; after the steaming and crystallization is completed, the water vapor in the autoclave is discharged, Dry at a temperature of 80-120°C for 30-90 minutes under normal pressure. After the material is discharged and cooled, it is pulverized and then cooled, homogenized and aged to obtain high-strength gypsum powder. The invention uses mechanically crushed natural gypsum as a raw material, and uses its own moisture to complete the whole process of high-strength gypsum steaming and crystallization; the drying time is very short; the quality of standard consistency, strength and fluidity is easy to control.

Description

technical field [0001] The invention relates to a process for producing high-strength gypsum, in particular to a process for producing high-strength gypsum with natural gypsum dry method. Background technique [0002] At present, most of the production of high-strength gypsum adopts traditional technology, which has the following disadvantages: [0003] (1) Only block gypsum can be used for production, the block particle size is between 20-30cm, and the steam curing time is 20-24 hours long. When using natural gypsum as raw material, it is necessary to use mechanical crushing. In the process of mechanical crushing, the damage rate is high, a large amount of gypsum powder and slag cannot be used, and the cost is high; [0004] (2) The autoclave needs to undergo two heat exchanges, resulting in large heat loss and high energy consumption; it must be equipped with boilers and water treatment equipment, which requires a large investment. Contents of the invention [0005] Th...

AI Technical Summary

Problems solved by technology

When using natural gypsum as raw material, it is necessary to use mechanical crushing. In the process of mechanical crushing, the damage rate is high, a large amount of gypsum powder and slag cannot be used, and the cost is high;

[0004] (2) The autoclave needs to go through two heat exchanges, the heat loss is large, and the energy consumption is high; it must be equipped with boilers and water treatment equipment, and the investment is large