从超细粒高铅锌氰化尾渣中浮选回收有价金属的试验研究

从超细粒氰化尾渣中回收有价元素是浮选中的难题，目前采用的方法主要是先加入氧化剂预处理脱氰，再加入捕收剂浮选。然而，该工艺存在药剂成本高、氰化物无法循环使用及矿物表面二次氧化等问题。以山东某高铅锌氰化尾渣为研究对象，在不脱氰的条件下，以氰化贫液为浮选用水，通过浮选试验和闭路试验等方法研究氰化尾渣的浮选回收效果。试验结果表明，在不脱氰的条件下，可浮选回收铅锌，铅精矿铅品位为56.61%，回收率为89.04%；锌精矿锌品位为32.6%，回收率为74.5%。SEM显微镜研究表明，铅精矿中铜矿物表面包裹一层小颗粒方铅矿，改变了黄铜矿界面性质，使得铜矿物表面特性趋于方铅矿界面性质，导致铜矿物大部分进入铅精矿中。

Experimental Study on Flotation Recovery of Valuable Metals from Ultrafine Cyanide Tailing Containing High Grade Lead and Zinc

Recovery valuable metal from cyanide tailing by flotation is difficulty.The main method currently adopted is to remove cyanide from tailing by adding oxidizing agents and then adding collector to recovery the objective minerals.However，there are some problems in the process，such as high cost of reagent，cyanide unable to reuse，and secondary oxidation of mineral surface.Taking cyanide tailings which contain high grade of lead and zinc in Shandong Province as research object，the flotation recovery of cyanide tailings was studied by flotation test and closed circuit test under the condition of non-cyanide removal，cyanide barren solution was used as flotation water.It was proved that valuable metals in the cyanide tailing can be recovery by flotation under the condition of non-cyanide removal.The cyanide tailing was processed to obtain qualified Pb concentrate with grade of 56.61% and recovery rate of 89.04%，Zn concentrate with grade of 32.6% and recovery rate of 74.5%.SEM microscopic study shows that the surface of copper mineral is insulated by a thin layer of galena，which changes the interface properties of chalcopyrite，and makes surface characteristics of copper minerals tend to interfacial properties of galena，leading to the majority of copper minerals entering into lead concentrates.