广西某锰银矿工艺矿物学及锰的赋存状态

Technological Mineralogy and Manganese Occurrence State of a Manganese-Silver Deposit in Guangxi

对广西某锰银矿进行了工艺矿物学的研究，查明了锰银原矿石矿矿物成分．金属矿物主要为硬锰矿、软锰矿、黄铁矿、赤铁矿和少量毒砂、黄铜矿、闪锌矿．矿石的主要结构是隐晶质结构、胶状结构、显微鳞片结构及砂质结构．主要的构造是脉状构造、胶状构造、浸染状构造．精矿中银品位是3923g·t^-1，锰的赋存状态是独立的锰矿物，锰矿物是硬锰矿和软锰矿．精矿中硬锰矿在0．152～0．088mm粒级范围内占17％，0．088～0．074mm粒级范围内占38％；〉0．074mm粒级范围占40％；软锰矿在0．152～0．088mm粒级范围内占18％，0．088～0．074mm粒级范围内占35％；〉0．074mm粒级范围占37％．

The technological mineralogy of a manganese-silver deposit in Guangxi is studied. Identifying its mineral composition, the metallic minerals are revealed consisting of psilomelane, pyrolusite, pyrite and hematite with a few of arsenopyrite, chalcopyfite and sphalerite. The textures of the manganese silver ore include aphanitic, colloform, micro-squama and arenaceous textures, and its structures are mainly the vein, colloform and disserminated structures. The silver grade of manganese-silver concentration is 3 923 g·t^-1. The occurrence state of manganese in the deposit is the self-contained manganese mineral including psilomelane and pyrolusite. In the concentration the grain size distribution of psilomelane is 17% in the range 0.152～0.088 mm, 38% in 0.088～0.074 mm and 40% 〉 0.074 mm, while that of pyrolusite is 18% in 0.152～0.088 mm, 35% in 0.088～0.074 mm and 37% 〉 0.074 mm.