Method for preparing calcium sulfate crystal whisker in low cost

A calcium sulfate whisker, low-cost technology, applied in chemical instruments and methods, single crystal growth, crystal growth, etc., to achieve the effects of low production cost, improved performance, and simple process steps

Inactive Publication Date: 2013-03-13
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, there is no relevant report on the preparation of calcium sulfate whiskers from heavy calcium carbonate and anhydrite

Method used

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  • Method for preparing calcium sulfate crystal whisker in low cost

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Take by weighing 50 kilograms of 200-300 purpose powdery heavy calcium carbonate, add in batches in the reaction kettle that 500 liters of 1mol / L dilute sulfuric acid solutions are housed, react under stirring until no gas escapes, add 11.2 kilograms of magnesium chloride and 300 Kg of water, stir evenly, pour into a 1000L reaction kettle with a pump, stir at 350r / min, react at 150°C for 5h, cool down, filter with 100 mesh filter cloth, wash the filter cake with water 2-3 times, 250-300 Dry at ℃ for 2 hours to obtain 55 kg of anhydrous calcium sulfate whisker product. Calcium sulfate whiskers have a diameter of 1-10 μm and a length of 50-200 μm.

Embodiment 2

[0021] Weigh 50 kilograms of 200-300 mesh powdered anhydrite, add it in batches to a reaction kettle equipped with 200 liters of 1mol / L dilute sulfuric acid solution, stir and react at 60°C until no bubbles are generated, filter with suction, and filter cake and Add 11.2 kg of magnesium chloride to 700 kg of water, stir evenly, pour it into a 1000L reactor with a pump, stir at 350r / min, react at 160°C for 4 hours, cool down, filter with 100-mesh filter cloth, and wash the filter cake with water for 2- 3 times, drying at 250-300°C for 2 hours to obtain 42 kg of anhydrous calcium sulfate whisker product. Calcium sulfate whiskers have a diameter of 1-10 μm and a length of 50-200 μm.

Embodiment 3

[0023] Weigh 20 kilograms of 200-300 mesh powdered anhydrite and 30 kilograms of 200-300 mesh powdered heavy calcium carbonate, add them in batches to a reactor containing 400 liters of 1mol / L dilute sulfuric acid solution, and stir at 60°C React until no bubbles are formed, filter with suction, add the filter cake and 11.2 kg of magnesium chloride to 700 kg of water, stir evenly, pump them into a 1000L reactor, stir at 350r / min, react at 150°C for 5h, cool down, Suction filter with a 100-mesh filter cloth, wash the filter cake with water 2-3 times, and dry at 250-300°C for 2 hours to obtain 51 kg of anhydrous calcium sulfate whisker product. Calcium sulfate whiskers have a diameter of 1-10 μm and a length of 50-200 μm.

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Abstract

The invention discloses a method for preparing calcium sulfate crystal whisker in low cost and relates to a method for preparing the calcium sulfate crystal whisker. The method comprises the following steps of: crushing raw materials consisting of ground limestone and anhydrite, treating the crushed ground limestone and anhydrite by a sulfuric acid solution, adding a crystal growth substance to prepare a mixture solution, preparing calcium sulfate hemihydrate crystal whisker with higher length-diameter ratio by a hydrothermal synthesis method at high temperature under high pressure, and carrying out filtering, washing and high-temperature crystal water removing steps on the calcium sulfate hemihydrate crystal whisker to obtain high-quality anhydrous calcium sulfate crystal whisker products. The calcium sulfate crystal whisker prepared by the method disclosed by the invention can be applied to high polymer material such as plastic and rubber to improve the performances of polymer materials by serving as a reinforcing material. The method disclosed by the invention has the advantages of low production cost, simple operation and high additional value of products.

Description

technical field [0001] The invention relates to a method for preparing calcium sulfate whiskers, in particular to a method for preparing calcium sulfate whiskers at low cost. Background technique [0002] Calcium Sulfate Whisker (CSW), also known as gypsum whisker, is an orthorhombic or monoclinic crystal, and is a fibrous single crystal of calcium sulfate. Like gypsum, it can be divided into anhydrous, semi-hydrated and dihydrated. Among them, anhydrous and semihydrated calcium sulfate has the greatest strength and high use value, so its research and application also have great economic value. The use of calcium sulfate whiskers as reinforcing materials has the advantages of stable size, high strength, good toughness, high temperature resistance, chemical corrosion resistance, non-toxicity, easy surface treatment, relatively low production costs, and strong affinity for polymers such as rubber and plastics. Use as a medium-strength enhancer. [0003] In recent years, due...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B7/10C30B29/62C30B29/46
Inventor 梁兵曹俊关旭东
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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