PROCESS MINERALOGY STUDY AND BENEFICIATION TEST OF A VEIN QUARTZ ORE FROM QINGHAI PROVICE

Refined vein quartz ore can replace berg crystal to produce high purity quartz sand in large scale,and it is necessary to study the ore properties before developing processing technology. Based on the observation under polarizing microscope,the process mineralogy of a quartz ore from Qinghai province was studied with modern detecting methods like XRD,ICP and SEM-EDS. The mineralogical properties of the ore including chemical composition,mineral assemblage and dissemination characteristics,occurrences of impurities were investigated,and beneficiation test conducted. The result showed that the quartz formed in two periods has great difference in particle size,containing a large amount of inclusions; gangue minerals and later quartz formed in one period,mainly composed of muscovite,fluorite and iron mineral; the overall character of dissemination indicated that the vein quartz ore was difficult to be liberated and purified,and it's occurrence state of impurity elements is complicated. After a preliminary purification,the purity of Si O2 was 99. 91% in fine-grained quartz sand,and the vein quartz ore can be used as raw material for producing high-purity quartz sand.