Abstract
Trace elements in quartz, especially iron impurities, can severely affect the quality of products. The removal of iron impurities is one of the technical difficulties in the preparation process of high-purity quartz sand. In this work, the effect of the transformation of the crystal structure on the removal of iron impurities in quartz sand was investigated. After respectively roasting at 600 °C, 900 °C, and 1200 °C for 4 h, the crystal structure of quartz was transformed, and the target crystal structure was solidified via quenching to form a structure favorable for the removal of iron by acid leaching. The experimental results show that the transformation of the crystal structure can effectively improve the removal efficiency of iron impurities. The content of β-quartz was found to be as high as 94.7% after roasting at 900 °C for 4 h. The removal efficiency of iron impurities reached 98.7% after acid leaching at 200 °C, and the removal efficiency of the total impurities reached 88.2%. In addition, the influences of different crystal structures on the removal of iron impurities were systematically investigated. This work provides excellent practical support for the removal of iron impurities during the preparation of high-purity quartz sand.
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