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Method for preparing calcium sulfate hemihydrate whiskers with high aspect ratio by utilizing calcium sulfate dihydrate

A technology of calcium sulfate dihydrate and calcium sulfate hemihydrate, applied in chemical instruments and methods, single crystal growth, single crystal growth, etc., can solve the problems of product purity, low aspect ratio, high requirements, etc., and achieve product added value High, extended raw material range, efficient and thorough removal effect

Active Publication Date: 2021-02-05
郑州中科新兴产业技术研究院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the existing technology for preparing calcium sulfate whiskers, the reaction of calcium salts with higher purity and sulfuric acid / sulfate is mostly used, and the requirements for the purity of raw materials are relatively high; In the technology of whiskers, most of them only go through simple pretreatment processes such as crushing and screening, pickling, water washing, etc., because the inhibition effect of a large number of complex ions in chemical gypsum on the growth of calcium sulfate whiskers is ignored, the purity and long diameter of the obtained products lower than average

Method used

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  • Method for preparing calcium sulfate hemihydrate whiskers with high aspect ratio by utilizing calcium sulfate dihydrate
  • Method for preparing calcium sulfate hemihydrate whiskers with high aspect ratio by utilizing calcium sulfate dihydrate
  • Method for preparing calcium sulfate hemihydrate whiskers with high aspect ratio by utilizing calcium sulfate dihydrate

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Embodiment 1

[0034] The present embodiment utilizes the desulfurization gypsum of the power plant as a raw material to prepare the method for calcium sulfate hemihydrate whiskers with high aspect ratio, and the specific steps are as follows:

[0035] (1) Fine grinding / removal of impurities: According to the ratio of liquid to solid ratio of 1, mix desulfurized gypsum with 10% sodium hydroxide solution and add it to the stirring mill for fine grinding, control the fine grinding time to 0.5h, and discharge Particle size D90<200 mesh;

[0036] (2) Acid leaching to remove impurities: filter the slurry obtained in step (1), add dilute hydrochloric acid with a concentration of 10% in the obtained solid phase, adjust the liquid-solid ratio to 1, perform acid leaching and remove impurities, and control the reaction temperature The temperature is 50℃, and the leaching time is 1h, so that the impurity components such as carbonates and oxides in the raw materials can be further reacted and removed; ...

Embodiment 2

[0043] Present embodiment utilizes natural gypsum as raw material, the method for preparing calcium sulfate hemihydrate whisker with high aspect ratio, concrete steps are as follows:

[0044] (1) Fine grinding / removal of impurities: According to the ratio of liquid to solid ratio of 1.5, mix natural gypsum with 15% sodium hydroxide solution and add it to the stirring mill for fine grinding and removal of impurities. The particle size of the material is D90<200 mesh, and the impurities such as alumina and silicon dioxide in the raw material are fully removed;

[0045] (2) Acid leaching to remove impurities: filter the slurry obtained in step (1), add dilute hydrochloric acid with a concentration of 10% in the obtained solid phase, adjust the liquid-solid ratio to 2, perform acid leaching to remove impurities, and control the leaching time For 2h, realize that impurity components such as carbonate and iron oxide in the raw material are fully removed;

[0046] (3) Oxidation and ...

Embodiment 3

[0052] In this embodiment, titanium gypsum is used as a raw material to prepare the method for calcium sulfate hemihydrate whiskers with high aspect ratio, and the specific steps are as follows:

[0053] (1) Fine grinding / removal of impurities: According to the ratio of liquid to solid ratio of 1, mix natural gypsum with 10% sodium hydroxide solution into the ball mill for fine grinding, control the fine grinding time to 0.5h, and the output particle size D90<200 mesh;

[0054] (2) Acid leaching to remove impurities: take the slurry obtained in step (1) for solid-liquid separation, add dilute sulfuric acid with a concentration of 10% to the obtained solid phase at room temperature, adjust the liquid-solid ratio to 2, and perform acid leaching to remove impurities process, control the leaching time to 2 hours, and realize the further reaction and removal of impurity components such as carbonates and oxides in the raw materials;

[0055] (3) Oxidation and impurity removal: soli...

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Abstract

The invention provides a method for preparing calcium sulfate hemihydrate whiskers with high aspect ratio by using calcium sulfate dihydrate. Calcium sulfate dihydrate is used as raw material and finely ground in lye; then, the obtained slurry is subjected to solid-liquid separation Acid leaching is carried out under acidic conditions to remove impurities such as carbonates and oxides contained in it; secondly, the oxidation of strong oxidants is used to remove pigments, organic substances and other impurities through oxidation; After deep impurity removal and purification, the calcium sulfate dihydrate is washed, filtered, and slurried to make a calcium sulfate dihydrate slurry with a certain concentration, and a certain proportion of crystal form regulator is added, and finally the crystal form is carried out under hydrothermal conditions. After conversion, the obtained product is filtered and dried to obtain the calcium sulfate hemihydrate whisker product. The invention has the advantages of simple process, wide source of raw materials, low cost, large length-to-diameter ratio and uniform grain size of the obtained whiskers, which can be used as fillers and reinforcing agents in industries such as papermaking, plastics and rubber, and has high added value of products.

Description

technical field [0001] The invention relates to the technical field of preparation of calcium sulfate whiskers, in particular to a method for preparing calcium sulfate hemihydrate whiskers with high aspect ratio by utilizing calcium sulfate dihydrate. Background technique [0002] With the rapid development of my country's infrastructure and economy, the discharge of various chemical gypsum is increasing day by day. However, there is a lack of corresponding effective technology for the utilization and treatment of chemical gypsum, so in-situ accumulation is mostly used in the actual production process. Long-term accumulation not only wastes a lot of land, but also the harmful substances in gypsum will cause serious pollution to the environment, which not only brings a huge burden to the enterprise, seriously hinders the development of the enterprise, but also has a serious impact on the local ecological environment. [0003] As an inorganic whisker material, calcium sulfate ...

Claims

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Application Information

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IPC IPC(8): C30B7/10C30B29/46C30B29/62
CPCC30B7/10C30B29/46C30B29/62
Inventor 田登超郭强李永利李申邵大伟
Owner 郑州中科新兴产业技术研究院
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