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1. 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 initiate a reaction in a first reactor at a temperature of between 100 and 200 DEG C to form fluotitanic acid; B) adding a mixed saline solution of sodium carbonate and sodium hydroxide to the fluotitanic acid, controlling PH=3-4, separating ferrous hydroxide from ferric hydroxide, further adding the mixed saline solution to make PH=7-8, obtaining a sodium fluotitanate solution, concentrating, crystallizing and rinsing the sodium fluotitanate solution to obtain the intermediate material sodium fluotitanate; C) putting dried sodium fluotitanate into a second reactor, injecting an inert gas to the second reactor after vacuumizing, heating the second reactor to a temperature of between 780 and 1000 DEG C, dripping molten aluminium in the second reactor and stirring quickly to initiate a reaction for 4 to 6 hours to form titanium sponge and sodium cryolite; or, putting aluminium into a second reactor, injecting an inert gas to the second reactor after vacuumizing, heating the second reactor to the temperature of between 780 and 1000 DEG C, adding dried sodium fluotitanate in the second reactor after the aluminium is molten and stirring quickly to initiate a reaction for 4 to 6 hours to form titanium sponge and sodium cryolite; D) extracting molten liquid sodium cryolite; after the molten liquid sodium cryolite is cooled, crushing and sending it to a rotary reaction kettle quantificationally together with concentrated sulphuric acid to initiate a reaction at a temperature of between 400 and 500 DEG C to form hydrogen fluoride gas and a solid mixture of sodium sulphate and aluminium sodium sulphate; collecting the hydrogen fluoride gas and dissolving it into water to obtain a hydrofluoric acid aqueous solution; reacting the solid mixture of sodium sulphate and aluminium sodium sulphate with an aqueous solution of sodium hydroxide after crushing the solid mixture of sodium sulphate and aluminium sodium sulphate, and obtaining an aqueous solution of sodium sulphate after separating out solid aluminium hydroxide; and E) recycling the obtained hydrofluoric acid aqueous solution to step A) to leach the titaniferous iron concentrate, so as to cyclically prepare the intermediate material sodium fluotitanate.
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