Process and device for preparing gas-phase white carbon black by taking quartziferous fluorite tailings as raw materials

Process and device for preparing gas-phase white carbon black by taking quartziferous fluorite tailings as raw materials

  • CN 105,967,190 A
  • Filed: 07/08/2016
  • Published: 09/28/2016
  • Est. Priority Date: 07/08/2016
  • Status: Active Grant
First Claim
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1. the technique preparing gas-phase silica for raw material with quartziferous fluorite mine tailing, it is characterised in that include following stepRapid:

  • (1), by fluorine-containing acid solution, mix with one or both in nitric acid, hydrochloric acid, prepare mix acid liquor standby;

    WillQuartziferous fluorite mine tailing is ground to the fineness of below 200 mesh, with magnet separator magnetics more than 10000 Gausses in grinding processBlanking ferrum, prepares powder;

    (2), mix acid liquor is put in reactor, the waste gas absorption in the agitating device of unlatching reactor and response systemDevice, puts into powder in reactor;

    (3), the reaction temperature controlled in reactor be 70~

    85 DEG C, Fluohydric acid. in mix acid liquor or hexafluosilicic acid and quartzSilicon dioxde reaction in matter fluorite mine tailing generates silicon tetrafluoride gas, is volatilized in this silicon tetrafluoride gas and mix acid liquorSour gas and steam brought in cooling reactor by negative pressure together;

    (4), the chilling temperature controlled in cooling reactor be 0~

    36 DEG C, mixed gas react in cooling reactor generate HF,Cl2/NO2

    SiO2·

    nH2O, wherein HF and Cl2/NO2Taken out of from cooling reactor by negative pressure, and be only absorbed by the water generation canFor reusable Fluohydric acid., hydrochloric acid/nitric acid, SiO2·

    nH2O condenses on absorption chiller in cooling reactor, collectsSiO in cooling reactor2·

    nH2O;

    (5), by collected SiO2·

    nH2O carries out negative pressure preheating in vacuum heater, removes the acidity wherein remainedGas HF and Cl2/NO2, it is dried the most again, can be prepared by gas-phase silica product after drying, SiO in product2Content is more than 99.9%, and its multiple spot BET method measurement the specific area is not less than 350m2/g;

    (6), in a kettle., mix acid liquor is oxidized to sulphuric acid the sulfur component in powder, after reaction kettle for reaction completes,Filtered while hot, obtains filtering residue and filtrate, washes filtering residue with water neutrality, sells or be used as after the filter residue and drying washedCement adds material;

    Or filtering residue is carried out flotation again, i.e. can get highly purified Fluorspar Powder and borontrifluoride aluminium powder.

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