Influence of surfactant on the permeability at different positions of a leaching column

Abstract

To solve the problems of poor permeability and low leaching rate in ore heap leaching, solid surface physical chemistry, seepage mechanics theory for porous media, CT scanning and SEM were used to carry out column leaching tests with a homemade segmented removable plexiglass column; the variation law for the permeability coefficients of each segment of the leaching column before and after leaching was analyzed. The experimental results showed that there was little difference in the permeability coefficient of ore at different heights before leaching. After leaching, the permeability coefficients were unevenly distributed along the column height, and the lowest value was located at the bottom of the leaching column. The addition of surfactant provided an obvious improvement in the permeability of the leaching column. The permeability coefficient at the bottom of the leaching column was 6% higher than that of the control group. At the same time, the addition of surfactant increased the leaching rate of ore by nearly 10%. A theoretical analysis showed that the surfactant improved the permeability of ore heaps mainly by preventing physical blockage by fine particles and inhibiting deposition of chemical products.

Experimental Study on the Influence of Surfactants on Ore Surface Wettability

“…AlZaabi et al showed through relevant experiments that cationic surfactant cetyltrimethylammonium bromide had significant wettability change potential, and the increase of surfactant concentration did not necessarily lead to better wettability change. Ai et al − found through the column leaching test that the addition of surfactants significantly improved the permeability of the leaching column, and the mining rate increased by about 10%. In addition, “leaching reaction coefficient” and “surface activity coefficient” were introduced.…”