Homogeneous mixts. of alkali metal silicate and carbonate

    公开(公告)号:DE19504284A1

    公开(公告)日:1995-08-17

    申请号:DE19504284

    申请日:1995-02-09

    Applicant: DEGUSSA

    Abstract: Homogeneous crystalline or partly crystalline alkali metal silicate/carbonate mixts. (I) have the compsn. M2SixO2x+1 . yNa2CO3 . zH2O, where M = Na or K, x = 1.5-3, y = 0.025-1 and z = 0-1, and have a Ca-binding power of at least 50 mg CaO/g anhydrous (I) at 20 deg C. Also claimed is the prodn. of (I) by dissolving an alkali metal carbonate or bicarbonate in an alkali metal silicate soln., or adding an alkali metal carbonate or bicarbonate soln. to an alkali metal silicate soln. to form a homogeneous soln. with a silicate/carbonate ratio as above; converting the soln. to a solid prod.; and heating the prod. at 200-550 deg C until the H2O content is as above. Also claimed is a process for softening water contg. Ca and/or Mg ions, comprising adding (I) to the water.

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