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Effect of silver, nickel and copper cyanides on gold adsorption on activated carbon in cyanide leach solutions

Sayiner B., Acarkan N.

Physicochemical Problems of Mineral Processing

2014

Vol. 50, iss. 1

277--287

The effect of Ag, Ni and Cu cyanides on gold adsorption on activated coconut carbon in cyanide leach solutions was investigated by synthetic cyanide leach solutions containing gold and other metal cyanides. According to the adsorption tests Ag remarkably reduces the gold adsorption on activated carbon by competing with gold to adsorption sites. When the Ag concentration in solution increases up to 200 ppm the carbon adsorption method for gold recovery becomes inapplicable. Ni has an effect on gold adsorption on activated carbon, however even at as high concentrations of Ni as 250 ppm residual Au in solution is still below 1 ppm. Cu addition up to 300 ppm does not affect the gold loading significantly. According to the adsorption test studies, it is concluded that the metal-cyanides diminish the gold adsorption on activated carbon by adsorbing themselves and competing with gold. When the metals are present in the leach solution all together with gold, they also prevent adsorption of themselves as well as gold. Thus, when Au, Ag, Ni and Cu are present in solution simultaneously, the adsorption of all these metals decreases. The adsorption results were modeled by Fleming k,n adsorption kinetic model.

Prediction of adsorption equilibria for mixtures of pesticides present in industrial wastewater

Żurawska M., Blaszke A., Hupka J.

Polish Journal of Chemical Technology

2005

Vol. 7, nr 1

80-87

Several mathematical models describing liquid-solid equilibria were used to predict adsorption isotherms for an aqueous phase. The experimental data was correlated with the vacancy solution theory, exponential model and other mathematical models basing on the modified Freundlich isotherm. The data pertained to the removal of pesticides from wastewater originating from the pesticide waste dumpsite in Southern Poland. A static method was used for the adsorption of pesticides. Three models, namely the VST, exponential and Dubinin-Radushkevich can particulary well be used for the prediction of the adsorption efficiency of the selected pesticides.