【摘要】 砷是云南某银铅锌多金属矿中的有害元素。通过光学显微镜鉴定以及矿物自动分析仪AMICS等现代先进仪器，快速并准确查明了砷的赋存状态及其对选矿的影响。研究表明：该矿石中砷的品位为0.53%,砷主要分布在毒砂中，其次分布在黄铁矿中，少量分布在雄黄和细硫砷铅矿中。但是，导致银铅精矿砷超标的主要因素是雄黄和细硫砷铅矿，其次为毒砂。要想进一步降低银铅精矿中的砷，需强化对雄黄和毒砂的抑制；细硫砷铅矿与方铅矿关系密切且化学性质相近，二者很难有效分离，因此银铅精矿中砷含量很难降到0.77%以下。导致硫精矿砷高的主要因素是毒砂和含砷黄铁矿，即使黄铁矿与毒砂有效分离，硫精矿中砷含量很难降到0.22%以下。对于锌精矿来说，闪锌矿与毒砂、黄铁矿相对好分离，因此砷易脱除。研究结果为云南地区含砷银铅锌多金属矿床的选矿降砷工艺提供了理论依据。更多还原

【Abstract】 Arsenic is a harmful element in a silver-lead-zinc polymetallic ore in Yunnan.The occurrence state of arsenic and its effect on beneficiation are quickly and accurately identified by means of optical microscope and automated mineral analyzer such as AMICS.The results show that the arsenic content is 0.53%,and the arsenic is mainly distributed in arsenopyrite, followed by pyrite, partly distributed in realgar and gratonite.However, the main factor leading to the high arsenic content of silver-lead concentrate is that realgar and gratonite, followed by arsenopyrite.In order to reduce the arsenic content, the depression of realgar and arsenopyrite should be strengthened.Gratonite and galena are closely related and have similar chemical properties, and they are difficult to be effectively separated, so the arsenic content in silver-lead concentrate can hardly be reduced to less than 0.77%.The main factor leading to the high arsenic content of sulfur concentrate is arsenopyrite and arsenic-bearing pyrite.Even if pyrite and arsenopyrite are separated effectively, the arsenic content can hardly be reduced to less than 0.22%.For zinc concentrate, sphalerite is relatively easy to separate from arsenopyrite and pyrite, so the arsenic content is easy to reach the standard.The research results provide a theoretical basis for arsenic reduction process of the arsenic-bearing Ag-Pb-Zn polymetallic deposit in Yunnan.更多还原