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Mass production method for calcium sulfate whisker

A calcium sulfate whisker, large-scale technology, applied in chemical instruments and methods, single crystal growth, crystal growth, etc., can solve the problems of low reaction concentration and inability to achieve large-scale production

Active Publication Date: 2008-04-30
武善东 +1
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Problems solved by technology

[0007] The deficiency of this patent application technology is: 30-40% phosphoric acid is produced according to the current minimum cost condition, is the phosphoric acid liquid from the ammonium phosphate process, and is the raw material for the ammonium phosphate process to enter the ammonification granulation. In order to obtain this raw material, Must have this kind of technology as the basis
[0009] It can be clearly seen from the materials used, preparation requirements and output of this method that this is a method for preparing high-end calcium sulfate products in a laboratory. A large amount of organic solvent recovery and such a low reaction concentration cannot achieve large-scale production. basic requirements

Method used

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  • Mass production method for calcium sulfate whisker
  • Mass production method for calcium sulfate whisker
  • Mass production method for calcium sulfate whisker

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Embodiment Construction

[0047] 1. Invention principle:

[0048] The methods provided by the background art all have one thing in common: that is, whether it is using raw gypsum or using Ca 2+ and SO 4 2- Ions are used as raw materials, no matter in alkaline (hydrothermal synthesis method), acidic and neutral, aqueous solution or organic solution, the essence of calcium sulfate whisker generation is to use Ca in solution. 2+ and SO 4 2- Under specific conditions and according to specific requirements, it can produce needle-shaped products of pure calcium sulfate, especially calcium sulfate hemihydrate whiskers with a diameter of 1-10um, a length of 50-800um, and an aspect ratio of 20-500. Practical and also easy to manufacture. Based on the application technology of 200510067111.5 and 200610149043.1 invention patents, the present invention uses a small-scale experimental process equipment with a daily output of 3 tons of calcium sulfate whiskers to verify the following whisker reaction principles...

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Abstract

The invention discloses a new method for large-scale production of calcium sulfate whiskers, which is characterized in that a large number of cheap water-soluble Ca2+ and water-soluble SO42- ions are used at a certain pH, salt-containing impurities and whisker control agents and a certain synthesis Calcium sulfate whiskers were synthesized under conditions such as , aging, and temperature. The invention has the advantages of simple process, low investment, low cost and excellent products. It can be co-produced with various existing processes containing Ca2+ and SO42-, can eliminate the waste water and waste residue pollution of these processes, and can greatly improve these co-production processes. economic benefits.

Description

Technical field [0001] The present invention relates to a method for producing calcium sulfate whiskers, in particular to a water-soluble Ca 2+ Ions and water-soluble SO 4 2- Ions are used as raw materials to carry out a method for large-scale production of calcium sulfate whiskers under the premise of extremely low energy consumption. Background technique [0002] Calcium sulfate whiskers, also known as gypsum whiskers, are fibrous single crystals of calcium sulfate with an aspect ratio of 5-1000. Like gypsum, they can be divided into anhydrous, semihydrated and dihydrated. Calcium sulfate whiskers have the particle size of granular fillers, the aspect ratio of short fibrous fillers, stable dimensions, high strength, good toughness, high temperature resistance, chemical corrosion resistance, easy surface treatment, and strong affinity with polymers such as rubber and plastics. , and because of its fluffy volume, excellent dispersibility and thermal insulation, it is a ra...

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Application Information

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IPC IPC(8): C30B29/10C30B7/14C30B29/62
Inventor 武善东武征张建华武善斌
Owner 武善东
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