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A method for preparing calcium sulfate hemihydrate whiskers by hydrothermal method with short cycle and low cost

A low-cost technology of calcium sulfate hemihydrate, applied in the field of gypsum products, can solve the problems of long reaction period, high production cost, large energy consumption, etc., and achieve the effects of shortening heat preservation time, reducing production cost, and improving the quality of whiskers

Active Publication Date: 2022-05-13
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the preparation process of calcium sulfate whiskers is mainly hydrothermal method, which has high conversion rate and simple process, but needs to use high-pressure reactor to accelerate the reaction. The reaction cycle is long, energy consumption is large, and the production cost is high, which restricts industrial preparation. and application promotion

Method used

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  • A method for preparing calcium sulfate hemihydrate whiskers by hydrothermal method with short cycle and low cost
  • A method for preparing calcium sulfate hemihydrate whiskers by hydrothermal method with short cycle and low cost
  • A method for preparing calcium sulfate hemihydrate whiskers by hydrothermal method with short cycle and low cost

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Effect test

Embodiment 1

[0035] A kind of method that efficient hydrothermal method prepares calcium sulfate hemihydrate whisker, comprises the following steps:

[0036] The first step, water magnetization pretreatment: put the beaker containing distilled water in a magnetic field for magnetization, wind 100 turns of enameled wire around a beaker with a volume of 800ml and an outer diameter of 102mm, connect it to a waveform generator, and adjust the waveform to square wave, current The frequency is 50Hz, the magnetic field strength is 3.12mT, and the magnetization time is 30min.

[0037] The second step is to prepare slurry: prepare calcium sulfate slurry with a concentration of 5% with magnetized pretreated water.

[0038] The third step, hydrothermal process: put the slurry prepared in the second step into a high-pressure reactor with a stirring device, the stirring rate is 300r / min, the holding temperature is set at 120°C, and the holding time is 5.5min. After the holding time is over, the pressu...

Embodiment 2

[0040] A kind of method that efficient hydrothermal method prepares calcium sulfate hemihydrate whisker, comprises the following steps:

[0041] The first step, water magnetization pretreatment: put the beaker containing distilled water in a magnetic field for magnetization, wind 100 turns of enameled wire around a beaker with a volume of 800ml and an outer diameter of 102mm, connect it to a waveform generator, and adjust the waveform to square wave, current The frequency is 50Hz, the magnetic field strength is 3.12mT, and the magnetization time is 30min.

[0042] The second step is to prepare slurry: prepare calcium sulfate slurry with a concentration of 5% with magnetized pretreated water.

[0043] The third step, hydrothermal process: put the slurry prepared in the second step into a high-pressure reactor with a stirring device, the stirring rate is 300r / min, the holding temperature is set at 120°C, and the holding time is 6 minutes. After the holding time is over, the pre...

Embodiment 3

[0045] A kind of method that efficient hydrothermal method prepares calcium sulfate hemihydrate whisker, comprises the following steps:

[0046] The first step, water magnetization pretreatment: put the beaker containing distilled water in a magnetic field for magnetization, wind 100 turns of enameled wire around a beaker with a volume of 800ml and an outer diameter of 102mm, connect it to a waveform generator, and adjust the waveform to square wave, current The frequency is 50Hz, the magnetic field strength is 3.12mT, and the magnetization time is 30min.

[0047] The second step is to prepare slurry: prepare calcium sulfate slurry with a concentration of 5% with magnetized pretreated water.

[0048]The third step, hydrothermal process: put the slurry prepared in the second step into a high-pressure reactor with a stirring device, the stirring rate is 300r / min, the holding temperature is set at 120°C, and the holding time is 7min. After the holding time is over, the pressure ...

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Abstract

A method for preparing calcium sulfate hemihydrate whiskers by a short-cycle low-cost hydrothermal method, in which water is subjected to magnetization pretreatment; calcium sulfate dihydrate and magnetized water are used to configure calcium sulfate slurry; the configured slurry is packed into Put it into a high-pressure reactor for hydrothermal synthesis, then take it out for suction filtration, dehydration, and drying to obtain calcium sulfate hemihydrate whiskers. The present invention prepares calcium sulfate whiskers through hydrothermal synthesis, and heats them at 120-125°C for 5-50°C. The calcium sulfate hemihydrate whisker material can be prepared in 7 minutes. Compared with the conventional hydrothermal process, the invention shortens the holding time to about 1 / 6, and the prepared whiskers have an average diameter of 1.1-1.2 μm, a length of 70-80 μm, an aspect ratio of 58-73, and a crystallinity of more than 91%. The production cost is greatly reduced and the whisker quality is improved.

Description

technical field [0001] The invention belongs to the technical field of gypsum products, relates to the preparation of calcium sulfate, in particular to a short-cycle and low-cost hydrothermal method for preparing calcium sulfate hemihydrate whiskers. Background technique [0002] Gypsum is mainly used for primary building materials and preparation of sulfuric acid, etc. The comprehensive utilization rate of resources is only about 47%, and the added value of products is low, the utilization rate is not high, the waste is serious, and the pressure of environmental pollution from tailings stockpiling is increasing rapidly. [0003] Compared with primary building materials, the use of gypsum to prepare calcium sulfate hemihydrate whiskers can greatly expand the use of gypsum and increase product value, which is one of the important directions for the development of the gypsum mining industry. Calcium sulfate hemihydrate whiskers have a complete structure, good toughness, and ex...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/46C30B29/62C30B7/10
CPCC30B29/46C30B29/62C30B7/10
Inventor 卫亚儒王宇斌何廷树陈畅毛欣钰马晓晓华开强王雯雯林星彤李亮
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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