Method for preparing calcium sulfate dihydrate whisker from mirabilite and calcium water

A technology of calcium sulfate dihydrate and Glauber's salt, applied in chemical instruments and methods, single crystal growth, single crystal growth, etc., can solve the problems of Glauber's salt containing many impurities, polluting fresh water resources, and low utilization rate, and achieve complete and uniform mass transfer , the effect of uniform reaction system and uniform morphology

Active Publication Date: 2015-09-09
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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Problems solved by technology

Glauber's salt is the main by-product of viscose fiber production in my country, and this kind of Glauber's salt contains a lot of impurities, its utilization rate is very low, the supply far exceeds demand, and most of it is directly discharged into rivers as waste, seriously threatening the entire ecology environment, polluting our country's fresh water resources

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  • Method for preparing calcium sulfate dihydrate whisker from mirabilite and calcium water

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Effect test

Embodiment 1

[0032] The concrete steps of the method for preparing calcium sulfate dihydrate crystal whisker with Glauber's salt and calcium water of the present invention are as follows:

[0033] (1) Purification of calcium aqueous solution:

[0034] Add it to industrial calcium water under normal temperature conditions (the amount is to remove impurities (Ba 2+ 、Sr 2+ ) 1.05 times of required amount) concentration is 10~30wt% sulfuric acid, stirs 20min, centrifuges solid-liquid then, obtains relatively pure calcium aqueous solution;

[0035] (2) Preparation of raw material solution:

[0036] Add calcium chloride or water to the calcium water to adjust the concentration of calcium water to 0.6mol / L;

[0037] Prepare an aqueous solution of Glauber's salt with a concentration of 1.6mol / L, the volume ratio of the Glauber's salt solution to the calcium aqueous solution is 0.4:1, and add 0.5wt% surfactant to the prepared Glauber's salt solution;

[0038] Then preheat the calcium water and ...

Embodiment 2

[0047] The concrete steps of the method for preparing calcium sulfate dihydrate crystal whisker with Glauber's salt and calcium water of the present invention are as follows:

[0048] (1) Purification of calcium aqueous solution:

[0049] Adding sulfuric acid with a concentration of 10-30wt% to industrial calcium water under normal temperature conditions, the amount of addition is Ba 2+ 、Sr 2+1.10 times the required amount, stirred for 50 minutes, and then centrifuged to separate the solid and liquid to obtain a relatively pure calcium aqueous solution;

[0050] (2) Preparation of raw material solution:

[0051] Add calcium chloride or water to the calcium water to adjust the concentration of calcium water to 1.6mol / L;

[0052] Prepare an aqueous solution of Glauber's salt with a concentration of 0.6 mol / L, the volume ratio of the Glauber's salt solution to the calcium aqueous solution is 1.2:1, and add 1wt% surfactant to the prepared Glauber's salt solution;

[0053] Then...

Embodiment 3

[0062] The concrete steps of the method for preparing calcium sulfate dihydrate crystal whisker with Glauber's salt and calcium water of the present invention are as follows:

[0063] (1) Purification of calcium aqueous solution:

[0064] Adding sulfuric acid with a concentration of 10-30wt% to industrial calcium water under normal temperature conditions, the amount of addition is Ba 2+ 、Sr 2+ 1.08 times the required amount, stirred for 30 minutes, and then centrifuged to separate the solid and liquid to obtain a relatively pure calcium aqueous solution;

[0065] (2) Preparation of raw material solution:

[0066] Add calcium chloride or water to the calcium water to adjust the concentration of calcium water to 1.0mol / L;

[0067] Prepare an aqueous solution of Glauber's salt with a concentration of 1.0mol / L, the volume ratio of Glauber's salt solution to calcium aqueous solution is 0.8:1, and add 0.8wt% surfactant to the prepared Glauber's salt solution;

[0068] Then prehe...

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Abstract

The invention discloses a method for preparing calcium sulfate dihydrate whisker from mirabilite and calcium water. The normal-pressure acidification process, which is utilized to produce the dihydrate gypsum whisker from industrial calcium water and mirabilite, can effectively utilize industrial wastewater (calcium water and mirabilite), solves the problem of discharge of the industrial wastewater, achieves the goal of green chemical industry, and completely conforms to the national industrial policy. The gypsum whisker belongs to a high-tech environment-friendly product, has the advantages of wide market demand prospects and obvious economic benefits, and has sufficient and cheap raw material resources in the local region after being put into production. The method is simple and easy to implement, and can easily implement industrialization. Therefore, the project can obtain huge economic benefit and social benefit if being researched and finally constructed in the local region. The finally obtained calcium sulfate dihydrate whisker has the advantages of uniform shape, proper length-diameter ratio (50 above), high yield (up to 84%) and high whiteness (at least 96%).

Description

technical field [0001] The invention relates to the technical field of preparing calcium sulfate whiskers, in particular to a method for preparing calcium sulfate dihydrate whiskers by using mirabilite and calcium water. Background technique [0002] Gypsum whiskers are a new type of inorganic material with high comprehensive performance. The material has high strength, good toughness, high modulus, high dielectric strength, wear resistance, high temperature resistance, corrosion resistance, good infrared reflectivity, easy surface treatment, strong affinity with polymers, and good compatibility And smoothness, non-toxic and many other excellent physical and chemical properties. It can be used as reinforcement and toughening agent or functional filler in ceramics, metals, resins, plastics, rubber, coatings, paints, papermaking, asphalt, friction and sealing materials, and high insulation materials for coated wires; it can also be used as insulation materials, Flame retarda...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/62C30B29/46C30B7/14
Inventor 刘勇颜杰杨虎谢云涛潘中才杨永彬杨力伟徐飞
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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