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Alpha-type hemihydrated gypsum producing process and apparatus thereof

A technology of hemihydrate gypsum and production process, applied in the field of building materials, can solve the problems of poor performance of α-type hemihydrate gypsum, unstable steam temperature and high safety requirements, and achieve stable heat supply, small temperature change and high heat utilization rate. Effect

Inactive Publication Date: 2004-04-21
TONGJI UNIV
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AI Technical Summary

Problems solved by technology

Using steam as the heat source, the pressure of the steam is relatively high, the safety requirements for the equipment are relatively high, and the temperature of the steam is unstable, and the performance of the produced α-type hemihydrate gypsum is relatively poor.

Method used

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  • Alpha-type hemihydrated gypsum producing process and apparatus thereof
  • Alpha-type hemihydrated gypsum producing process and apparatus thereof

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Embodiment Construction

[0015] The present invention is further described below by way of examples.

[0016] The diameter of the container 2 of design autoclave is 2m, and height is 2.5m, and interlayer spacing is 5cm, and the disk shape diameter of coil pipe 3 is 70cm, and the diameter of pipe is 6cm, and the diameter of loam cake 1 is 40cm, and the diameter of lower cover 4 The diameter of is 50cm, and corresponding drain pipe, drain control valve and exhaust control valve are set on the lower cover 4. The autoclave is made of steel plate. The interlayer of the container 1 and the coil pipe 3 communicate with the heat conduction oil furnace. During production, the gypsum ore is processed into fragments with a particle size of 1-5 cm, put into an autoclave, and water is added to submerge the gypsum ore. After the upper cover 1 is closed, the heat transfer oil heated by the heat transfer oil furnace is pumped into the spacer and the coil respectively. Raise the temperature in the container to abou...

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Abstract

A process for preparing alpha-semihydrated gypsum features use of the thermally conductive oil as heat source, and includes such steps as loading the gypsum ore into specially designed pressure digestion reactor, introducing hot thermally conductive oil to raise temp to 115-125 deg.C, and holding the temp for 2-4 hr. Said pressure digestion reactor has dual-layer wall, coiled tube for flowing said oil in it, top cover, and bottom cover with water and gas discharging pipe and its control valve. Its advantages are high thermal utilization rate, and high quality and strength of product.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a production process and equipment for α-type hemihydrate gypsum. Background technique [0002] Dihydrate gypsum is dehydrated by heating to produce hemihydrate gypsum. The gypsum slurry formed after mixing the hemihydrate gypsum with water has gelatinity, and regenerates dihydrate gypsum crystals due to hydration and hardening, and can form gypsum products with a certain shape and strength. [0003] Due to the different conditions of heating and dehydration, the structure and properties of hemihydrate gypsum are also different. Under dry conditions lacking water vapor, β-type hemihydrate gypsum is formed, that is, general building gypsum, and its strength is relatively low. In the presence of liquid water, α-type hemihydrate gypsum is formed after autoclaving treatment. The structure is relatively compact, the water consumption for mixing is small, and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B11/02C04B11/032
Inventor 陈志山刘选举
Owner TONGJI UNIV
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