Method for cyclically preparing titanium sponge and simultaneously producing potassium cryolite using potassium fluorotitanate as an intermediate material

摘要

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