Alpha-type semi-hydrated gypsum autoclave and production method thereof

Abstract

The invention discloses an alpha-type semi-hydrated gypsum autoclave, which comprises a horizontal autoclave body. The horizontal autoclave body is provided with a feed end cover and a discharge end cover. A cavity wall of a cavity of the horizontal autoclave body is provided with a hot oil heating device. The hot oil heating device is connected to the outside of the horizontal autoclave body by a heat-transfer oil tube. The horizontal autoclave body is also provided with a steam inlet, a steam outlet and a water outlet. The Alpha-type semi-hydrated gypsum autoclave is used and double heat sources of heat-transfer oil and steam are adopted to heat to carry out dehydration; gypsum ore is arranged in the horizontal autoclave body, and then the steam is injected into the horizontal autoclave body from the steam inlet; the temperature of the steam is kept between 120 degree C to 170 degree C; the pressure is between 0.3MPa to 0.7MPa; simultaneously the heated heat-transfer oil is pumped in the heat-transfer oil tube under the hermetic condition; the temperature of the heat-transfer oil is kept between 170 degree C to 220 degree C; the heat-transfer oil and the steam are used for heating for 5 to 8 hours to complete producing semi-hydrated gypsum. As the Alpha-type semi-hydrated gypsum autoclave is used and double heat sources of the heat-transfer oil and the steam are adopted for heating, the gypsum has rapid and excellent crystal transformation in the crystal transformation process, and the product has the advantages of rapid water filtration, high intensity and excellent toughness.

Description

technical field [0001] The invention relates to an autoclave for producing α-type hemihydrate gypsum, and also relates to a production method of α-type hemihydrate gypsum using the autoclave. Background technique [0002] At present, the production of α-type hemihydrate gypsum generally uses a steam boiler as a heat source, which can be directly heated by steam or indirectly heated. After direct heating and dehydration, it needs to be dried again, so it is called a two-step method. Indirect heating can complete dehydration and drying in one device, so it is also called one-step method. Use steam as the heat source. The pressure of the steam is relatively high, and the safety requirements for the equipment are also relatively high, and the temperature of the steam is unstable. During the crystal transformation process of gypsum, the crystal transformation is slow and the quality of the crystal transformation is low; Slow water, low strength, poor toughness, and low product ...

AI Technical Summary

Problems solved by technology

Use steam as a heat source. The pressure of steam is relatively high, and the safety requirements for equipment are also relatively high, and the temperature of steam is unstable. During the process of crystal transformation of gypsum, the crystal transformation is slow and the quality of the crystal transformation is low; Slow water, low strength, poor toughness, and low product stability

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