预氧化处理对云南钛精矿浸出过程粉化的影响

Effect of Pre-oxidation on Pulverization of Yunnan Titanium Concentrate during Hydrochloric Acid Leaching

人造金红石作为天然金红石的优质代用品,大量用于生产氯化法钛白和海绵钛。针对云南钛精矿相关物化特性,采用预氧化钛精矿、盐酸浸取的方法制备人造金红石,研究预氧化处理对浸出率及粉化的影响。结果表明:预氧化处理改变了钛精矿结构,解决了盐酸浸出过程的粉化问题。在盐酸浓度为20%、酸矿比为5∶1时,加热到沸腾浸出在750℃时预氧化30 min后的钛精矿,得到的人造金红石粒度小于74μm的矿粒仅占3.29%,品位为77.1%。

Synthetic rutile as a good substitute for natural rutile is greatly used for production of titanium dioxide by chlorination process and sponge titanium. According to the physical and chemical properties of Yunnan titanium concentrate,pre-oxidation and hydrochloric acid leaching method was used to prepare synthetic rutile for researching the effect of pre-oxidation treatment on the leaching rate and pulverization.The results show that the structure of titanium concentrate is changed and the pulverization during hydrochloric acid leaching process is resolved by pre-oxidation. With 20% hydrochloric acid and 5∶ 1 of acid /ore ratio,heating to boiling for leaching the titanium concentrate oxidized at 750 ℃ for 30 min can obtain synthetic rutile with only 3. 29% of particles less than74 μm and 77. 1% of grade.