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Trace elements bound in quartz lattice are efficiently removed by KCl-doping calcination and pressure leaching. Removal rate of lattice Al reaches 73.5% when 70.4% of lattice-bound trace elements are removed from quartz sand at optimum conditions. The lattice-bound trace elements in quartz are activated by high-temperature calcination, released during phase transformation from α-quartz to cristobalite,...
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