The continuous way method of modifying of dihydrate gypsum and the modified dihydrate gypsum being modified with the method

The continuous way method of modifying of dihydrate gypsum and the modified dihydrate gypsum being modified with the method

  • CN 102,123,950 B
  • Filed: 07/31/2009
  • Issued: 03/29/2017
  • Est. Priority Date: 07/31/2008
  • Status: Active Grant
First Claim
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1. the continuous way method of modifying of a kind of dihydrate gypsum, it is characterised in that with following operation:

  • A () carries out wet type sintering or dry type sintering so as to make half aquation of semi-hydrated gypsum to the dihydrate gypsum as initiation materialOperation,B the pH of the slurry of the semi-hydrated gypsum is set as 7.0 ±

    2.0 by (), and the aqueouss that are supplied in recrystallization reactive tankCharging process in slurry,C () makes the semi-hydrated gypsum hydration lay equal stress on crystallization so as to make the crystal forms different from the dihydrate gypsum as raw materialModified dihydrate gypsum recrystallization chemical industry sequence,D () takes out the removal process of the part modified dihydrate gypsum from the recrystallization reactive tank,The operation of at least described (b) to (d) is carried out given either continuously or intermittently,Modified dihydrate gypsum in the quantity delivered of the semi-hydrated gypsum in the charging process of (b) and the removal process of (d)Withdrawal amount be that each hour is the total amount of gypsum in the recrystallization reactive tank less than 20%,In the recrystallization chemical industry sequence of (c), in the way of in recrystallization reactive tank there is no solid-liquid separation in water pasteEquably stirred, and kept at a certain temperature.

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