The further PTMS magnetic separator purification of quartz can be realized by using quartz insoluble in acid (except HF) and other impurity minerals can be dissolved by acid. Acid leaching commonly used acids are sulfuric acid, hydrochloric acid, nitric acid and hydrofluoric acid; Reducing agent has sulfite and its salts and so on.
In the instance, the acids to non-metallic impurities of quartz mineral has good removal effect, but with different metal impurity, acid type and concentration of effect is significant, generally considered a variety of dilute acid Fe removal of PTMS magnetic separator technology have a significant effect, while the removal effect of Ti and Cr with relatively concentrated sulfuric acid and aqua regia or HF acid leaching process. Usually, mixed acids composed of the above acids are used for acid leaching removal of impurity minerals, and HF can dissolve quartz, so HF concentration generally does not exceed 10%.
In addition to the concentration of acid, the amount of acid, leaching time, temperature and pulp stirring can affect the quartz leaching effect. The control of acid leaching factors should be based on the final grade requirements of quartz customers, as far as possible to reduce the concentration of acid, temperature and dosage, reduce acid leaching time, in order to achieve a lower cost of mineral processing PTMS magnetic separator process quartz purification. Some customers on the quartz iron requirements are more strict, so the comparison of systematic experimental quartz acid leaching purification process. After acid leaching, high purity quartz up to 99.99% can be obtained.
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