浙江某银矿矿石性质及选矿流程试验研究

Experimental Study on Properties and Beneficiation Process of Ores from a Silver Deposit in Zhejiang Province

为了查明浙江某银矿的矿石性质,本文采用偏光显微镜、化学物相分析、扫描电镜、X射线能谱、MLA分析等手段,对矿石的矿物组成、银的赋存状态、银矿物的嵌布特征、粒度组成等进行了系统研究,并分析了影响银选矿的矿物学因素。结果表明,该矿石中银的品位为145 g/t,含银矿物主要为银黝铜矿和车轮矿,银黝铜矿呈自形、半自形粒状,以星散浸染状的形式散布在脉石中,与脉石矿物连生密切且粒度不均匀;车轮矿的分布较广,与黄铁矿及方解石共生密切,矿物嵌布粒度细,是导致其选矿指标难以提高的主要因素。选矿闭路试验获得了含银1 461.00 g/t、银回收率为58.74%的选别指标,进一步验证了矿石性质研究结果。

In order to ascertain the ore properties of a silver mine in Zhejiang Province,a systematic study has been conducted on mineral compositions of the ore,the occurrence state of silver,distribution characteristics and particle sizes of silver minerals,by using analytical techniques including polarized microscopy,chemical phase analysis,scanning electron microscopy,X-ray energy spectroscopy,and MLA analysis.Then mineralogical factors affecting silver beneficiation have also been analyzed.The results show that the ore has Ag grade of 145 g/t,and main silver-bearing minerals of freibergite and bournonite.Freibergite is distributed in forms of scattered and disseminated euhedral and semi-euhedral particles in gangue minerals,and it is closely associated with the gangue minerals with various particle sizes.Bournonite is widely distributed,and is closely intergrowing with pyrite and calcite,with fine particle size which is the main factor resulted in the difficult improvement of its beneficiation index.The closed circuit test of mineral processing obtained a concentrate with a silver content of 1461.00 g/t and a silver recovery rate of 58.74%.This has further verified the research results of ore properties.