Method for preparing modified calcium sulfate whisker by using desulfurization gypsum

A calcium sulfate whisker and desulfurization gypsum technology, applied in chemical instruments and methods, calcium/strontium/barium sulfate, single crystal growth, etc., can solve problems such as complex process, difficult realization, and difficult industrial scale-up and mass production, and achieve The preparation process is green and environmentally friendly, the production cost is low, and the modification effect is good.
CN101994153AActive Publication Date: 2011-03-30JIANGSU EFFUL SCIENCE AND TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
JIANGSU EFFUL SCIENCE AND TECHNOLOGY CO LTD
Publication Date
2011-03-30

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Abstract

The invention discloses a method for preparing a modified calcium sulfate whisker by using desulfurization gypsum, comprising the following steps of sieving, pulping, performing hydro-thermal reaction and whisker surface modification, dewatering and drying, wherein the reaction temperature ranges from 107 DEG C to 180 DEG C, the concentration of desulfurization gypsum and water is 5-33wt% and the drying temperature ranges from 100 DEG C to 300 DEG C, and a modifier which is 0.05-5% of the weight of desulfurization gypsum in the calcium sulfate whisker suspension formed in hydro-thermal reaction. The invention solves the problem that CaSO4.0.5H2O whisker is easy to hydrate in the drying process tocause fracture of the whisker and enhances the compatibility of the calcium sulfate whisker and the high polymer materials. The prepared modified calcium sulfate whisker has a diameter of 0.5-6 micrometers, a length of 30-300 micrometers and a diameter ratio of 15-115 and the contact angle of water on the surface of the modified calcium sulfate whisker ranges from 12 to 140 degrees. The invention has the advantages of good modified effect, simple process, low production cost, the use of the non-toxic modifier and environmental-friendly preparation process.
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Description

Technical field

[0001] The invention relates to a preparation method of modified calcium sulfate whiskers, belonging to the technical field of resource recycling of industrial waste and new inorganic materials. technical background

[0002] Rich coal, poor oil, and low gas are the basic characteristics of my country's energy resources. This feature determines that coal occupies a dominant position in my country's energy structure. Coal will remain the most important energy source in my country for a long time. Due to environmental protection reasons, power plants must force desulfurization when using coal for power generation. At present, most coal-fired power plants in our country use wet desulfurization technology. This process produces a large amount of desulfurized gypsum that occupies cultivated land and pollutes the environment. Therefore, deep processing of desulfurized gypsum is one thing A work of great social and economic benefits.

[0003] Gypsum whiskers are small fibr...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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