针对广东某低品位金矿,在原有工艺的基础上进行实验室对比试验,采用单一浮选和浮选加尼尔森重选的方案进行综合评价。试验得到:单一浮选条件下细度在-0.075mm 84%时,闭路流程可获得产率2.22%,金品位63.30g/t,回收率88.31%的金精矿;尼尔森重选尾矿再磨至细度-0.075mm 68%时,浮选闭路试验可以获得产率1.95%,品位29.32g/t,回收率78.47%的浮选金精矿。此项试验表明,尼尔森重选+浮选为最优的选别方案。 Aiming at a low-grade gold mine in Guangdong, a laboratory comparative experiment was carried out on the basis of the original process, and a single flotation and flotation program of Gansu Nielsen reselection was used for comprehensive evaluation. The results showed that gold concentrate with a gold yield of 63.30 g / t and a gold recovery of 88.31% could be obtained in a closed circuit process with a fineness of -0.075 mm and 84% in a single flotation process; To the fineness of -0.075mm 68%, the flotation closed-circuit test can obtain the yield of 1.95%, grade 29.32g / t, the recovery rate of 78.47% flotation gold concentrate. This experiment shows that Nielsen reselection + flotation is the best selection scheme.