A kind of method that dihydrate calcium sulfate whisker is prepared with 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 polluting fresh water resources, high impurities in Glauber's salt, low utilization rate, etc., and achieve uniform reaction system, The effect of completely uniform mass transfer and uniform morphology

Active Publication Date: 2017-08-25
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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  • A kind of method that dihydrate calcium sulfate whisker is prepared with mirabilite and calcium water

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Experimental program
Comparison scheme
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 dihydrate calcium sulfate whiskers by using Glauber's salt and calcium water. The invention uses industrial calcium water and Glauber's salt as raw materials to produce dihydrate gypsum whiskers by means of normal pressure acidification, which can not only effectively utilize industrial Wastewater (calcium water, Glauber's salt), to solve the discharge problem, to achieve the purpose of green chemical industry, fully in line with the national industrial policy; and gypsum whiskers are high-tech environmental protection products, the market demand prospects are broad, the economic benefits are obvious. Sufficient and low-cost raw material resources are available, and the method is simple and easy to implement and easy to industrialize. Therefore, the study and final construction of this project in this area will definitely achieve huge economic and social benefits. The finally obtained calcium sulfate dihydrate whiskers have a uniform appearance, a suitable length-to-diameter ratio (more than 50), a yield of up to 84%, and a whiteness of ≥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 Patents(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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