Acid pickling and waste acid treatment process for improving purity of powdery quartz sand

Acid pickling and waste acid treatment process for improving purity of powdery quartz sand

  • CN 105,197,939 A
  • Filed: 09/26/2015
  • Published: 12/30/2015
  • Est. Priority Date: 09/26/2015
  • Status: Active Application
First Claim
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1. one kind is improved the pickling of quartz sand powder purity and useless acid-treated technique, it is characterized in that comprising the following steps:

  • (1), quartz sand powder to be purified is put in pickling purifying plant, pickle solution to be pumped in pickling purifying plant and the negative pressure water absorption system opened in pickling purifying plant with sour pump, described pickle solution is made up of 1 ~ 10% hydrofluoric acid, 5 ~ 20% silicofluoric acid, 3 ~ 20% oxalic acid and 50 ~ 90% water, or is made up of 10 ~ 20% silicofluoric acid, 5 ~ 20% oxalic acid and 60 ~ 85% water;

    (2), by heating temperatures to 60 ~ 85 DEG C in pickling purifying plant, and ON cycle system makes the pickle solution of heat circulate dynamic acid-washed quartz sand powder, and pickling removes pickle solution after 3 ~ 6 hours and collects;

    (3), deliver in water washing device with clear water by the quartz sand powder after pickling in pickling purifying plant, by quartz sand powder washing to neutrality, dehydration i.e. obtained finished product quartz sand powder;

    (4), the pickle solution collected in step (2) is transferred in neutralization tank with after lime slurry neutralization to pH=6 ~ 7, generate calcium silicofluoride and calcium oxalate precipitation, by the pickle solution after neutralization with being pumped in settling tank, in settling tank under calcium silicofluoride and calcium oxalate precipitation, reclaim after the material pressure filter of collecting precipitation is pressed into filter cake and use;

    (5), by the clear water after calcium silicofluoride and calcium oxalate precipitation send in equalizing tank again and regulate pH=8.5 ~ 9, with precipitated iron ion, the iron ion material pressure filter after precipitation is pressed into filter cake and reclaims use;

    (6), by the clear water after precipitation of iron ions send into equalizing tank again, after regulating pH=6 ~ 7 with oxalic acid, precipitation caoxalate, the calcium ion concn in the clear water obtained after filtering with quartz filter is identical with tap water, can deliver to workshop and recycle.

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