Method for producing alpha-hemihydrate gypsum through hydrothermal method

Abstract

The invention discloses a method for producing alpha-hemihydrate gypsum through a hydrothermal method. The method comprises the following steps of filling gypsum blocks into production equipment through a top feeding port, injecting water containing a crystal modifier through the top end of the production equipment, heating the water inside the production equipment to 143 DEG C, and maintaining the temperature for 4 hours, wherein the steam is introduced for 5 minutes by opening a steam inlet valve on the bottom of the production equipment by 50 to 60 percent every 15 minutes in the heating process and the temperature maintaining process, a steam exhaust valve on the top of the production equipment is opened by 3 to 5 percent in the steam introducing process, the introduction of the steam is stopped after the steam is introduced for 5 minutes, and the steam exhaust valve is closed; and after the temperature is maintained constant, stopping the introduction of the steam, thoroughly exhausting the water and the steam inside the production equipment, continuing heating until the alpha-semihydrated gypsum blocks inside the production equipment are completely dried to obtain the dry alpha-semihydrated gypsum blocks, and then pulverizing the alpha-semihydrated gypsum blocks into a finished product. The entire production process is simple, the production equipment is simple, the production efficiency is high, and the utilization rate of the effective heat is high.

Description

technical field [0001] The present invention relates to the processing of gypsum, especially the hydrothermal production method of α-hemihydrate gypsum. Background technique [0002] α-hemihydrate gypsum, also known as high-strength gypsum, the traditional "hydrothermal method" production process of α-hemihydrate gypsum uses powdered raw gypsum (the composition is dihydrate gypsum) as raw material, with 30% raw gypsum powder and 70% water The proportion of raw gypsum powder is mixed with a small amount of crystal modifier and injected into a standard high-pressure reactor with a stirring device; the heat is transferred from the wall layer of the reactor, and the raw gypsum powder slurry reaches 135 ° C ~ 143 ° C under constant stirring and heating , and keep the temperature for a certain period of time, remove one of the semi-crystallized waters, and convert the raw gypsum powder in the water into α-hemihydrate gypsum; then inject the α-hemihydrate gypsum slurry into a high-...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for producing hydrothermal α-hemihydrate gypsum to overcome the defects of complex production process and production equipment, large production line investment, high energy consumption and high production cost in the prior art