Study on quality characteristics of raw and fine sericite ores in Son Binh area, Ha Tinh province

Tóm tắt

In this paper, a range of analysis methods (XRD, XRF, SEM-EDS, ICP-MS, and AAS) were used to characterize the quality of Son Binh raw and fine sericite ores. The analytical results indicate that the Son Binh raw sericite ore belongs to a mineral group of sericite - quartz. Non-metallic mineral compositions are mainly quartz, sericite, and pyrophyllite. There are also a number of other minerals with a small content of kaolinite, chloride, and goethite. Son Binh sericite minerals have a fairly fine grain size, with the grain size < 20 µm, about 60%. Harmful metal elements of Cu, As, and Hg have quite strong linear relationships with the correlation coefficients of 0.83, 0.79, and 0.48, respectively. An effective mineral processing was set up with many technological solutions such as selective grinding, gravity separation, flotation, and chemical processing to increase the quality of Son Binh sericite ore. The fine sericites after mineral processing have a good quality with fairly uniform and small size, about 10 mm. Contents of harmful metal elements in the fine sericite (0.34% Pb, 1.8% As and 0.16% Cd) are lower than those in quality regulations. Chemical compositions and other characteristics of the Son Binh fine sericites after mineral processing completely meet quality standards for fields of paint, polymer, and cosmetic production.