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Method for preparing gypsum whisker

A technology for gypsum whiskers and whiskers, applied in chemical instruments and methods, single crystal growth, crystal growth, etc., can solve the problems of lack of preparation of gypsum whiskers, achieve the effects of protecting the environment, reducing production costs, and stabilizing chemical properties

Active Publication Date: 2015-04-08
SHANGHAI MCC ENVIRONMENTAL ENG TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the above-mentioned shortcoming of the prior art, the object of the present invention is to provide a kind of method for preparing gypsum whisker, for solving the problem in the prior art that utilizes limestone sludge to prepare the method for gypsum whisker

Method used

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  • Method for preparing gypsum whisker
  • Method for preparing gypsum whisker

Examples

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Embodiment 1

[0042] like figure 1 As shown, after drying limestone sludge at 500°C for 3 hours, limestone powder with a particle size of 1-10 μm was obtained. Get 50g of limestone powder, add 5wt% dilute sulfuric acid equal or excessive to the main component calcium carbonate in the limestone powder and react for 4 hours to generate calcium sulfate. After filtering the obtained calcium sulfate, add water to form a calcium sulfate solution and control the concentration of the solution to 10wt%, and then add zinc sulfate with a weight ratio of 1:20 to limestone as a catalyst. After heating in the kettle for 1 hour, take it out and filter, the filter material is hemihydrate gypsum whiskers, then immediately put the hemihydrate gypsum whiskers in a drying oven at 220°C for 1 hour to obtain anhydrous gypsum whiskers .

Embodiment 2

[0044] like figure 1 As shown, after drying limestone sludge at 500°C for 3 hours, limestone powder with a particle size of 1-10 μm was obtained. Get 50g of limestone powder, add 15wt% dilute sulfuric acid equal or excessive to the main component calcium carbonate in the limestone powder and react for 4 hours to generate calcium sulfate. After filtering the obtained calcium sulfate, add water to form a calcium sulfate solution and control the concentration of the solution to 10wt%, and then add zinc sulfate with a weight ratio of 1:20 to limestone as a catalyst. After heating in the kettle for 1 hour, take it out and filter, the filter material is hemihydrate gypsum whiskers, then immediately put the hemihydrate gypsum whiskers in a drying oven at 220°C for 1 hour to obtain anhydrous gypsum whiskers .

Embodiment 3

[0046] like figure 1 As shown, after drying limestone sludge at 650°C for 2 hours, limestone powder with a particle size of 1-10 μm was obtained. Get 50g of limestone powder, add 15wt% dilute sulfuric acid equal or excessive to the main component calcium carbonate in the limestone powder and react for 3 hours to generate calcium sulfate. After filtering the obtained calcium sulfate, add water to form a calcium sulfate solution and control the concentration of the solution to 30wt%, and then add zinc sulfate with a weight ratio of 1:20 to limestone as a catalyst. After 1.5 hours of water heating in the kettle, take it out and filter, the filter material is hemihydrate gypsum whiskers, and then put the hemihydrate gypsum whiskers in a drying oven at 210°C for 1.5 hours to obtain anhydrous gypsum whiskers .

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Abstract

The invention provides a method for preparing a gypsum whisker. The method comprises the following steps of: (1) drying limestone sludge to obtain limestone powder; (2) adding a certain amount of limestone powder to dilute sulphuric acid for reaction to generate calcium sulphate; (3) filtering the calcium sulphate obtained from the step (2), then adding water to prepare a calcium sulphate solution and controlling the concentration of the calcium sulphate solution, then adding zinc sulphate as a catalyst for hydrothermal reaction, and filtering to obtain a hemihydrate gypsum whisker; (4) drying the hemihydrate gypsum whisker to obtain an anhydrous gypsum whisker. The method for preparing the gypsum whisker, which is provided by the invention, changes the wastes into valuables by utilizing the limestone sludge regarded as waste residues and waste sulphuric acid liquor which are generated in the steel industry to prepare the anhydrous gypsum whisker with excellent properties. The method disclosed by the invention can not only be used for reducing the production cost of the gypsum whisker, but also be used for protecting the environment, thereby generating preferable influence on the harmonious development of society and environment.

Description

technical field [0001] The invention belongs to the technical field of inorganic materials, and in particular relates to a method for preparing gypsum whiskers. Background technique [0002] The atomic structure of whiskers is highly ordered during crystallization, so that it cannot accommodate larger defects that can weaken the crystal, such as particle boundaries, voids, dislocations, and structural incompleteness, etc. The crystal is almost complete, resulting in the strength of the whiskers approaching that of the material The theoretical strength of the valence bond between atoms far exceeds that of other reinforcing materials currently widely used. [0003] Gypsum whisker (Calcium Sulfate Whisker, also known as calcium sulfate microfiber, international trade name ONODA-GPF) is a new type of inorganic material with high comprehensive performance. Calcium sulfate whiskers are divided into three types: anhydrous, semi-hydrated, and dihydrated, and anhydrous calcium sulfa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B7/10C30B29/62C30B29/46
Inventor 韩甲兴杨刚王幼琴金强
Owner SHANGHAI MCC ENVIRONMENTAL ENG TECH CO LTD
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