Yunnan Yuntong Tiefeng ore dressing Pharmaceutical Company Limited (formerly Yunnan smelting factory subordinate Kunming Xishan ore dressing pharmaceutical factory) is located in Wuhua District, Kunming City, Yunnan Province, is one of the four key ore dressing pharmaceutical production enterprises Chinese nonferrous metallurgy industry, which has a long history of more than fifty years, the main products "Tie Feng" brand mineral processing reagents is fine