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Preparation method of anhydrous calcium sulfate whisker

A whisker and calcium carbonate technology, which is applied in the preparation of anhydrous calcium sulfate whiskers and anhydrite whiskers, can solve problems such as uneven length-to-diameter ratio, crystal water, and harsh control conditions of production methods

Active Publication Date: 2014-04-30
淮南市明月环保科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The preparation methods of these calcium sulfate whiskers use natural or by-product calcium sulfate dihydrate as raw materials, and there are disadvantages such as harsh production method control conditions, low product whiteness, uneven aspect ratio, high production cost, and water of crystallization.

Method used

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  • Preparation method of anhydrous calcium sulfate whisker
  • Preparation method of anhydrous calcium sulfate whisker
  • Preparation method of anhydrous calcium sulfate whisker

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Prepare 75ml of 25% (mass fraction) ammonium sulfate solution, weigh 1.0g of calcium carbonate and wet-grind the slurry, add it to the absorption bottle, put it in a 50℃ constant temperature water bath, and pass SO 2 (The concentration is 5%, N 2 In order to fill the gas, the flow rate is controlled to 100m1 / min), the reaction is carried out for 80 minutes, the calcium sulfite whiskers are obtained by filtration and drying, and then the anhydrous gypsum whiskers are obtained by high-temperature air reaction.

[0016] The anhydrous calcium sulfate whiskers obtained in Example 1 have a high aspect ratio of 30-200, and a high whiteness of over 90%.

Embodiment 2

[0018] Prepare 50ml of 25% (mass fraction) ammonium sulfate solution, add 3g of crystal aid to make a medium solution, weigh 0.5g of calcium carbonate and wet-grind the slurry, add it to the absorption bottle, and put it in a 50℃ constant temperature water bath. Into SO 2 (The concentration is 5%, N 2 In order to fill the gas, the flow rate is controlled to 100ml / min), the reaction is carried out for 50 minutes, and the calcium sulfite whiskers are obtained by filtration and drying, and then anhydrous gypsum whiskers are obtained by high-temperature air reaction.

[0019] The anhydrous calcium sulfate whiskers obtained in Example 2 have a high aspect ratio of 50-200 and a high whiteness of over 90%.

Embodiment 3

[0021] Prepare 25% (mass fraction) of 75ml of ammonium sulfate solution, weigh 0.8g of calcium hydroxide and wet-grind the slurry, add it to the absorption bottle, put it in a 50℃ constant temperature water bath, and pass SO 2 (The concentration is 5%, N 2 In order to fill the gas, the flow rate is controlled to 100ml / min), the reaction is carried out for 80 minutes, and the calcium sulfite whiskers are obtained by filtration and drying, and then anhydrous gypsum whiskers are obtained by the high-temperature air reaction.

[0022] The anhydrous calcium sulfate whiskers obtained in Example 3 have a high aspect ratio of 30-150, and a high whiteness of 90%.

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Abstract

The invention provides a preparation method of anhydrous calcium sulfate whisker. The preparation method specifically comprises the following steps of by taking calcium carbonate or calcium hydroxide as a calcium source, sulfur dioxide as a sulfur source, and ammonium sulfate solution as a medium solution, adding the calcium source into the ammonium sulfate solution, introducing SO2 while agitating; reacting to obtain calcium sulfite whisker; and then filtering and drying with high temperature air to obtain the anhydrous calcium sulfate whisker. The preparation method has the advantages that the reaction condition is mild; the process equipment is simple; the equipment investment is low; the operation is high in flexibility; industrial production can be easily carried out; the whisker is high in length-diameter ratio and reaches 30 to 200 and high in quality; and the preparation method is applicable to independent production and also suitable for co-producing anhydrous calcium sulfate whisker in coal-fired flue gas desulphurization, as well as non-ferrous metal metallurgy, sulfuric acid production and other tail gas treatment.

Description

Technical field [0001] The invention belongs to the fields of chemical product production and new chemical materials. The invention relates to a method for preparing anhydrous calcium sulfate whiskers, more specifically, it uses calcium carbonate (or calcium hydroxide) as a calcium source, sulfur dioxide as a sulfur source, and ammonium sulfate as a medium solution. The stirring reaction first produces calcium sulfite whiskers, and then filters and high-temperature drying to obtain anhydrous gypsum whiskers. Background technique [0002] Gypsum whisker, alias: gypsum fiber, calcium sulfate whisker; aspect ratio: 20 or more. Gypsum whiskers have good dispersibility and ability to compound with other materials. It is used as a reinforcing material in a variety of inorganic and organic cementitious materials; it has good friction, heat preservation, heat insulation, fire resistance, and non-conductor insulation properties. It can be used as friction material, thermal insulation ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/62C30B29/46C30B7/14
Inventor 陶俊陶陶
Owner 淮南市明月环保科技有限责任公司
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