Method for preparing calcium sulfate whisker from phosphogypsum

Method for preparing calcium sulfate whisker from phosphogypsum

  • CN 104,562,180 A
  • Filed: 01/07/2015
  • Published: 04/29/2015
  • Est. Priority Date: 01/07/2015
  • Status: Active Application
First Claim
Patent Images

1. , by a method for preparing calcium sulphate whiskers from ardealite, comprise step as follows:

  • 1) phosphogypsum raw material crushing is got and grinding becomes granularity to be 20 ~ 600 object phosphogypsum powders;

    2) by step

         1) phosphogypsum powder and diluted acid be 10Kg/m by solid-to-liquid ratio 3~ 200Kg/m 3be placed in reactor to stir, reheat after dissolving and filter, obtain acid filtrate and filter residue respectively;

    3) by step

         2) acid filtrate carry out ripening, obtain the acid suspension liquid containing calcium sulfate crystal whiskers;

    This acid suspension liquid is filtered, obtains calcium sulfate crystal whiskers filter residue and acid waste liquid;

    Calcium sulfate crystal whiskers filter residue process water wherein rinses, and rinses pH value to wash filtrate for neutral, drier under-15 DEG C ~ 100 DEG C environment, obtains described calcium sulfate crystal whiskers.

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