Process and device for preparing gas-phase white carbon black by taking red mud as raw material

Process and device for preparing gas-phase white carbon black by taking red mud as raw material

  • CN 105,967,191 A
  • Filed: 07/08/2016
  • Published: 09/28/2016
  • Est. Priority Date: 07/08/2016
  • Status: Active Application
First Claim
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1. the technique preparing gas-phase silica with red mud as a raw material, it is characterised in that comprise the following steps:

  • (1), will containFluoric acid liquid, mixes with one or both in nitric acid, hydrochloric acid, prepares mix acid liquor standby;

    By red mud and hydrogen peroxidePelletize after mixing, is ground to the fineness of below 200 mesh after drying, and magnetic separation removes ferrum therein, then with molten by hydrochloric acidExcept filtering after the metal-oxide in the red mud after magnetic separation and rare earth element, collect filter cake standby;

    (2), mix acid liquor is put in reactor, the waste gas absorption in the agitating device of unlatching reactor and response systemDevice, puts into the powder that filter cake or filter cake obtain after drying, pulverizing in reactor;

    (3), the reaction temperature controlled in reactor be 75~

    90 DEG C, Fluohydric acid. in mix acid liquor or hexafluosilicic acid and filter cakeOr the silicon dioxde reaction in powder generates silicon tetrafluoride gas, the acid will volatilized in silicon tetrafluoride gas and mix acid liquorProperty gas and steam are 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


    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·


    (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 380m2/g;

    (6) silicon dioxide during, in a kettle., fluorine-containing acid solution decomposes filter cake or powder;

    Hydrochloric acid and nitric acid then analyteResidual metallic in material, the metal after decomposition is stayed in mix acid liquor with the form of ion and salt;

    Material in reactor is anti-Should filter after completing, isolate the AlF in filtering residue3

    Then filtrate is sent in vaporizer and is evaporated, obtain residue,Use dense sulfuric acid treatment residue, recycling TiO2

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