广西凤凰山锰银氧化矿的工艺矿物学特征

The Process Mineralogy of Fenghuangshan Manganese-bearing Silver Oxide Ores, Guangxi

凤凰山锰银氧化矿石的锰矿物主要为隐钾锰矿,少量软锰矿和锰铅矿。银的赋存形式较为复杂,但大致可分为3种:①呈微细粒的角银矿、自然银、硫铜银矿和辉银矿等独立银矿物;②呈类质同像赋存于隐钾锰矿中;③呈微粒矿物包体分布于隐钾锰矿或褐铁矿集合体的微裂隙中。银的3种赋存形式的分配比例与矿石中隐钾锰矿的含量有关。软锰矿和锰铅矿基本不含银。

It was found that the manganese minerals in the ores are mostly cryptomelane, and a little pyrolusite and plumbopsilomelane. Silver facieses of the ores could be classified into three forms: ① micrograined cerargyrite, native silver and argentite, ② isomorphic mixture in cryptomelane, ③ micro mineral inclusions distributed in the microcracks of manganese oxide minerals and limonite. The distributing proportion of these three forms relates to the content of cryptomelane in the ores. Pyrolusite and plumbopsilomelane contain little silver.