Calcium sulfate crystal and method for producing same

Calcium sulfate crystal and method for producing same

  • CN 105,874,013 B
  • Filed: 12/05/2014
  • Issued: 07/24/2020
  • Est. Priority Date: 12/06/2013
  • Status: Active Grant
First Claim
Patent Images

1. A composition of matter comprising anhydrite calcium sulfate whiskers grown from α

  • calcium sulfate hemihydrate microparticles,wherein the anhydrite calcium sulfate whiskers are formed by a process comprising the steps of subjecting calcium sulfate dihydrate to a pressure calcination process to produce particulate α

    calcium sulfate hemihydrate;

    sorting the α

    calcium sulfate hemihydrate to have a median particle size of 1 μ

    m to 5 μ

    m;

    combining water and the α

    calcium sulfate hemihydrate particles to form a slurry;

    hot pressing the slurry to form α

    calcium sulfate hemihydrate whiskers in water;

    dehydrating the α

    calcium sulfate hemihydrate whiskers, andheating the α

    calcium sulfate hemihydrate whiskers to form anhydrite calcium sulfate whiskers.

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