Recovery and formation mechanism of high brightness calcite …
To prepare the calcite powders, the milled marble powders were hydrothermally treated in an alkaline solution of 0.1 mol/l at 220 °C for 4 h. Fig. 4 shows the effect of milling time on the brightness of milled marble and calcite powders. After the milling process, the brightness of milled powders was substantially invariable, with the …
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