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现有适用于小型矿山的回收金的工艺会对矿山造成严重的环境问题 ,因为要用象汞和氰化物等有毒的化学药剂。称为煤 -金团聚法 (CGA)的回收金的方法是几年前发明的 ,它将矿浆中的疏水的金粒回收到煤 -金团聚体中 ,然后灼烧团聚体 ,以回收金。本文的目的是用浮选法使煤 -金团聚工艺分选过程最佳化。需要将煤 -金团聚法与混汞法进行比较 ,以确定用煤 -金团聚法代替混汞法的可行性。用含细粒金粒 (± 4 4μm)的人工混合物 ( 7g/t)进行了试验。搅拌水溶液中的工业煤和油 ,以使其形成团聚体。经一定的团聚时间后 ,添加矿浆和捕收剂 (如戊基钾黄药 ) ,再搅拌 5min ,然后分出团聚体。载有金的团聚体和尾矿干燥、灼烧、用王水处理和分析。试验规模从 1 50ml(用磁力搅拌器和用刮板人工刮团聚体 )扩大到 1L浮选机 ,最后扩大到 3L浮选机。试验发现 ,用两种浮选机所进行的试验中 ,金的回收率随搅拌速度增快而增加。在某一搅拌速度下 ,金的回收率最高 ,然后又降低。油粘度增大 ,团聚体的强度增大 ,金的回收率也升高。使用粗粒煤时 ,金的回收率高些 ,因为 ,此时团聚体易于浮选 ,金粒易于渗透到团聚体中。团聚体的返回试验表明 ,不仅可以使团聚体的金负载量增大 ,还可降低该法的生产费用。
The existing artefact for recovering gold from small mines poses serious environmental problems for mines due to the use of toxic chemicals such as mercury and cyanide. The method of recovering gold, known as coal-gold agglomeration (CGA), was invented several years ago to recover the hydrophobic gold particles in the slurry into coal-gold agglomerates and then ignite the agglomerates to recover the gold. The purpose of this paper is to optimize the flotation process for the coal-gold agglomeration process. The coal-gold agglomeration method needs to be compared with the amalgamation method to determine the feasibility of replacing the amalgamation method with the coal-gold agglomeration method. Experiments were performed with an artificial mixture (7 g / t) containing fine gold particles (± 4 4 μm). The industrial coal and oil in the aqueous solution are stirred to form agglomerates. After a certain period of reunion, add slurry and collector (eg, amyl potassium krypton), stir for 5 min, and then separate agglomerates. Gold-bearing aggregates and tailings are dried, burned, treated with aqua regia and analyzed. The test scale was expanded from 1 50 ml (artificial magnetic scraper agglomerate with scraper) to a 1L flotation machine and finally to a 3L flotation machine. It was found that the recovery of gold increased with increasing agitation speed in both types of flotation machines. At a certain agitation speed, the recovery rate of gold is the highest and then decreases again. The viscosity of the oil increases, the strength of the aggregates increases, and the gold recovery also increases. The use of coarse coal, the gold recovery rate higher, because at this time easy to flotation aggregates, gold particles easily penetrate into the aggregates. Return tests of agglomerates show that not only can the gold loading of the agglomerates be increased, but the production costs of the method can also be reduced.