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Process for continuously preparing calcium sulfate hemihydrate and calcium sulfate dihydrate whiskers from salty mud

A technology of calcium sulfate dihydrate and whiskers, which is applied in the directions of single crystal growth, crystal growth, single crystal growth, etc., can solve the problems of complicated steps and time-consuming pretreatment, and achieves the requirements of reducing equipment, simplifying the process, and reducing the reaction time. mild effects

Active Publication Date: 2021-11-19
CHINASALT JINTAN
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007]In summary, most of the current technical solutions have complicated steps, and the pretreatment takes a lot of time. The hydrothermal reaction often requires the addition of crystal modifiers, dispersants, or the use of strong acids as reaction raw material

Method used

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  • Process for continuously preparing calcium sulfate hemihydrate and calcium sulfate dihydrate whiskers from salty mud
  • Process for continuously preparing calcium sulfate hemihydrate and calcium sulfate dihydrate whiskers from salty mud
  • Process for continuously preparing calcium sulfate hemihydrate and calcium sulfate dihydrate whiskers from salty mud

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Embodiment 1

[0039] The composition of the salt mud used in the present embodiment is calculated in parts by weight: CaCO 3 : 64.8%, H 2 O: 23.5%, CaSO 4 : 9.2%, Mg(OH) 2 : 1.4%, NaCl: 0.5%, and the rest is SS.

[0040] (1), drip hydrochloric acid (mass fraction is 21%) to above-mentioned 100g salt mud until reaction system does not have bubble to occur;

[0041] (2) Filter the reaction system obtained in step (1), and measure the concentration of metal ions therein.

[0042] (3), the filtrate obtained in the step (2) is diluted to a calcium ion concentration of 0.5mol / L, and a magnesium ion concentration of 0.015mol / L, then adding concentrated hydrochloric acid to adjust the pH to 0.2.

[0043](4) Add the solution obtained in step (3) together with an equimolar and equal volume of sodium sulfate solution into a thick-walled pressure-resistant bottle, heat to 130° C., and the reaction time is 3 hours.

[0044] (5), after the reaction in step (4), filter while hot and collect filtrate ...

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Abstract

The invention relates to a process for continuously preparing calcium sulfate hemihydrate and dihydrate whiskers by using salty mud, which comprises the steps of firstly, adding diluted hydrochloric acid into the salty mud as a raw material, dissolving and filtering to obtain salty mud pickle liquor; then diluting, adding into a thick-wall pressure-resistant bottle together with sodium sulfate with equal mole and equal volume, heating, and filtering after the crystal whiskers grow; and respectively collecting filtrate and solid; washing and drying the solid to obtain calcium sulfate hemihydrate whiskers; and adding the filtrate into the thick-wall pressure-resistant bottle again, aging in a heat insulation box, cooling, filtering, washing and drying to obtain the calcium sulfate dihydrate whiskers. The method does not need to firstly prepare a calcium sulfate precursor, does not need to add a dispersing agent, does not need to stir, effectively utilizes filtrate and waste heat, improves the overall yield of the whiskers, fully utilizes energy and reduces energy consumption. Magnesium ions and sodium chloride in the salty mud are effectively utilized, the quality of the calcium sulfate dihydrate whiskers is improved, the adopted raw material is the waste salty mud in the chlor-alkali industry, the yield is huge, and the utilization of the salty mud has very high economic value and environmental protection significance.

Description

technical field [0001] The invention relates to the technical field of environmental protection and solid waste resource utilization, in particular to a process for preparing hemihydrate and dihydrate calcium sulfate whiskers by using salt mud hydrothermally. Background technique [0002] Calcium sulfate whiskers are calcium sulfate fibrous single crystals with uniform cross-section, complete shape and perfect internal structure. They have the characteristics of high strength, high modulus, high toughness, wear resistance and high temperature resistance. Calcium sulfate whiskers can be divided into dihydrate, hemihydrate, and anhydrous calcium sulfate whiskers according to the content of crystal water in the crystal. Whiskers with different crystal water contents can be used in different industrial fields, among which dihydrate calcium sulfate whiskers It is widely used in the paper industry, while anhydrous calcium sulfate whiskers are mostly used in coatings, paints, autom...

Claims

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Application Information

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IPC IPC(8): C30B29/46C30B29/62C30B7/14
CPCC30B29/46C30B29/62C30B7/14
Inventor 郭方元陈留平崔耀星苏志俊李直
Owner CHINASALT JINTAN
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