Method for preparing sponge titanium from sodium fluotitanate by aluminothermic reduction

摘要

The invention provides a method for preparing sponge titanium from sodium fluotitanate by aluminothermic reduction, comprising the following steps: a reaction step: aluminum and zinc are mixed under a vacuum state, and sodium fluotitanate is then added into the mixture for reaction; a separation step: the product resulting from the complete reaction stands still and is then introduced with inert gas, and NaF and AlF₃ in upper-layer liquid phase are extracted; and a distillation step: Zn in the remaining product Zn-Ti is distilled out under a vacuum state, wherein the mass ratio of the aluminum to the zinc is 1:2 to 1:10. The invention further provides another method for preparing sponge titanium from sodium fluotitanate by aluminothermic reduction, comprising the following steps: a reaction step: aluminum, zinc and magnesium are mixed under a vacuum inert gas introduction condition, and the mixture is then reacted with sodium fluotitanate; a separation step: the product resulting from the complete reaction stands still and is then introduced with inert gas, and NaF, AlF₃ and MgF₂ in upper-layer liquid phase are extracted; and a distillation step: Mg and Zn in the remaining product are distilled out under a vacuum state, wherein the mass ratio of the aluminum to the zinc to the magnesium is 18:108:1 to 1:6:1.