Continuous crystallization process for sodium metasilicate pentahydrate

Continuous crystallization process for sodium metasilicate pentahydrate

  • CN 105,084,377 A
  • Filed: 08/24/2015
  • Published: 11/25/2015
  • Est. Priority Date: 08/24/2015
  • Status: Active Application
First Claim
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1. a metasilicate pentahydrate sodium continuous crystallisation technique, is characterized in that comprising the following steps:

  • (1) quartz sand and liquid caustic soda are dropped in reactor respectively, described quartz sand and described liquid caustic soda are that 1;

    1.5-1.8 add according to solid-to-liquid ratio, and to control the described reaction times of two kinds of raw materials in reactor be 4-12h, temperature of reaction is higher than 150 DEG C;

    (2) product obtained after step (1) reaction is delivered in filter, centrifugal segregation unreacted quartz sand completely, and then obtains liquid sodium silicate;

    (3) liquid sodium silicate step (2) obtained and caustic soda carry out hybrid reaction according to 1;

    1.5-2.5, then carry out evaporation concentration, obtain Starso liquid;

    (4) Starso liquid cooling step (3) obtained, to the curable phase change point temperature a little more than Starso, is then delivered in granulating equipment by transferpump, then joins in granulating equipment by charging machine by crystal seed;

    (5) mixing speed of granulating equipment is controlled turn/min at 50-60, by kind of the mixing of materials of two in granulating equipment under whipped state, carry out crystallization granulation, obtain crystallized product;

    (6) crystallized product that step (5) obtains is carried out whole grain further, cooling, cooling temperature controls below 50 DEG C, is divided obtain varigrained product by sifted.

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