OBJECTIVETo establish the quality assessment method of crude pyritum.

METHODThe correlations of methods of modern and traditional quality appraisement with density for crude pyritum were investigated.

RESULTAppraisement of crude pyritum using density as an evaluation index was in accordance with its traditional quality appraisement method. The density had extremely significant positive correlation with FeS2 content contained in crude pyritum (r = 0.990, P<0.001) and became smaller with the decreasing of FeS2 content. Meantime the density also had extremely significant negative correlation with total ferrum content contained in crude pyritum (r = -0.971, P<0.001) and became smaller with the increasing of total ferrum content.

CONCLUSIONIt's feasible to take density as evaluation index for quality control of crude pyritum, and the testing method established is simple and convenient.