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METHOD FOR PREPARING TITANIUM OR TITANIUM ALUMINUM ALLOY AND BYPRODUCT- TITANIUM-FREE CRYOLITE THROUGH TWO-STAGE ALUMINOTHERMIC REDUCTION
METHOD FOR PREPARING TITANIUM OR TITANIUM ALUMINUM ALLOY AND BYPRODUCT- TITANIUM-FREE CRYOLITE THROUGH TWO-STAGE ALUMINOTHERMIC REDUCTION
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机译：通过两步铝热还原法制备钛或钛铝合金及副产物-无钛冰晶石的方法
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摘要
The present invention relates to a method for preparing titanium or titanium aluminum alloys through two-stage aluminothermic reduction and obtaining titanium-free cryolite as byproducts. The method comprises the following steps: (1) using sodium fluoride and sodium fluotitanate as raw materials, or using sodium fluotitanate as raw materials, and using titanium aluminum alloy powder as a reducing agent;(2) mixing and pressing into pellets, and carrying out first-stage aluminothermic reduction and vacuum distillation; (3) finely grinding after taking out titanium-containing cryolite, mixing with the reducing agent and briquetting, and carrying out second-stage aluminothermic reduction; and (4) separating low-titanium titanium aluminum alloys from high-titanium titanium aluminum alloys, making the low-titanium titanium aluminum alloys and the high-titanium titanium aluminum alloys into powder and returning to the two-stage aluminothermic reduction as the reducing agent; or after the alloys are molten, making the alloys into powder for the two-stage aluminothermic reduction.
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