Method for cyclically preparing titanium sponge and simultaneously producing sodium cryolite using sodium fluoratitanate as an intermediate material

摘要

The disclosure discloses a method for cyclically preparing titanium sponge and coproducing sodium cryolite using sodium fluotitanate as an intermediate material, which includes the following steps: A) adding hydrofluoric acid to titaniferous iron concentrate to enable a reaction to form fluotitanic acid; B) adding sodium carbonate and sodium hydroxide to the fluotitanic acid to enable a reaction to form the sodium fluotitanate; C) putting the sodium fluotitanate into a reactor, adding aluminium to react with the sodium fluotitanate to form the titanium sponge and sodium cryolite; or, putting the aluminium into the reactor, adding the sodium fluotitanate to react with the aluminium to form the titanium sponge and sodium cryolite; D) extracting the sodium cryolite and sending it to a rotary reaction kettle together with concentrated sulphuric acid to enable a reaction to form hydrogen fluoride gas and sodium sulphate, aluminium sodium sulphate; collecting the hydrogen fluoride gas and dissolving it into water to obtain a hydrofluoric acid solution; E) recycling the obtained hydrofluoric acid to Step A to leach the titaniferous iron concentrate. The disclosure can recycle the coproduct sodium cryolite, thereby shortening the process of preparing titanium sponge, reducing the comprehensive cost of production, improving the production efficiency and reducing environmental pollution.