Agglomeration heap leaching of precious metals
The Bureau of Mines has developed a particle agglomeration technique to improve the flow of leaching solution through heaps of low-grade gold-silver ores which contain clays. Bench-scale experiments and industrial practice have shown that the percolation rate of cyanide leaching solution is greatly enhanced by mixing the ore with Portland cement as a binder, moistening the mixture, mechanically tumbling to form agglomerates, and aging before heap building and leaching. A slight modification of the technique allows its application to precious-metal-bearing tailings, which cannot normally be treated by heap leaching because they are too fine.
Metallurgy, Agglomeration, Heap leaching, Cyanide leaching solution, Tailings, Precious metals, Gold, Silver.