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Autogenous solid state processing of chrysocolla with sodium sulphide has been carried out at different CuSiO 3 -Na 2 S-ratios, particle sizes and temperatures. Water soluble sodium silicate (Na 2 SiO 3 ) and covellite (CuS) were determined by means of chemical analysis and X-ray examination as reaction products. More than 84% of chrysocolla and 50% of associated malachite...
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