A kind of method that potassium fluosilicate prepares potassium fluoride

A kind of method that potassium fluosilicate prepares potassium fluoride

  • CN 103,121,699 B
  • Filed: 02/26/2013
  • Issued: 03/01/2017
  • Est. Priority Date: 02/26/2013
  • Status: Active Grant
First Claim
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1. a kind of method that potassium fluosilicate prepares potassium fluoride is as follows including step:



  • 1)

    Mass concentration is added in the ammonia that mass concentration is 10 ~ 25% for 10 ~ 50% potassium fluosilicate slips, potassium fluosilicate:

    The mol ratio of ammonia is 1:



    5.0~10.0)

    , 50 ~ 90 DEG C of temperature is reacted 0.5 ~ 2 hour, obtains containing potassium fluoride, ammonium fluoride and titanium dioxideThe mixed slurry of silicon;

    Described potassium fluosilicate slip is to use 60 with the thick potassium fluosilicate obtaining in wet defluorination of phosphoric acid purification processAdd water preparation after ~ 80 DEG C of hot wash remove impurity and obtain;



    2)

    By step(

    1)

    In mixed slurry standing sedimentation 1 ~ 4 hour, be filtrated to get containing potassium fluoride and ammonium fluoride mixed solutionFiltrate and solid silica filter cake;



    3)

    By step(

    2)

    In filtrate carry out cooling down, crystallize, filtration separation and obtain mixing of potassium fluoride and ammonium fluoride after being driedSynthetic body, this mixed crystal is calcined in 220 DEG C ~ 260 DEG C temperature in fluidizing reactor, makes ammonium fluoride be decomposed into fluorinationHydrogen ammonium, ammonium acid fluoride distils further and sublimates and obtains ammonium acid fluoride to the top of fluidizing reactor, in fluidized bed roasting furnace bottomObtain potassium fluoride, ammonia return to step after water absorption of decomposition(

    1)

    Recycle.

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