Method for producing alpha-hemihydrate gypsum through hydrothermal method
A hemihydrate gypsum and production method technology, applied in the field of gypsum processing, can solve the problems of complex production process and production equipment, large investment in production line, high production cost, etc., and achieve the effects of simple production process, uniform water temperature and high production efficiency
Inactive Publication Date: 2014-08-27
TAIYUAN UNIV OF TECH
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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
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Embodiment Construction
[0016] The technical solutions claimed by the present invention are described in detail below.
[0017] A hydrothermal method for producing α-hemihydrate gypsum according to the present invention can be realized by using a pressure vessel with a heat-conducting wall layer. The top of the pressure vessel is provided with a feeding port and an exhaust pipe, and the bottom is provided with a discharge pipe. Port, steam inlet pipe and drain pipe, and correspondingly set exhaust valve, steam inlet valve and drain valve on the above pipelines.
[0018] When using the hydrothermal method of the present invention to produce α-hemihydrate gypsum, first put raw gypsum with a block diameter of 40 to 60 mm into the production equipment from the top feeding port to reach 90% to 95% of the volume of the production equipment;
[0019] Inject water containing a crystal-transforming agent from the top of the production equipment to submerge the raw gypsum. The amount of water used is 15% of th...
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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-...
Claims
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IPC IPC(8): C04B11/032
Inventor 史秀锋韩灵翠任瑞鹏潘韩铭张莉王永昌孙飞彭欣游向轩
Owner TAIYUAN UNIV OF TECH