Abstract
ABSTRACT The fine quartz was mixed with gold chloride solution to perform stirring contrast experiment under the condition of with and without iodization. Experimental factors were studied in order to gain the best inhibitory effect of iodization about adsorption effect of quartz on gold chloride, including gold solution concentration, stirring speed, stirring time, and KI-I2 dosage. Adsorption property of quartz on gold chloride was obtained by fitting and calculation of adsorption models. On the basis, the adsorption mechanism of quartz on gold chloride is revealed. Experimental results show that adsorbed amount without iodization is higher than with iodization, which is restrained by iodization. The best condition restrained adsorption is gold chloride of 100 mg/L, stirring speed of 500 r/min, stirring time of 8 min under condition of pH = 6 and 10% pulp density, and the best KI-I2 dosage are C(KI) = 2.5g/L and C(I2) = 2g/L. The fitting and calculation of adsorption models demonstrate that the adsorption of quartz on gold chloride contains favorable chemical adsorption in addition to physical adsorption. The analysis results show the main mechanism of chemical adsorption for inhibiting adsorption with iodization is that the ultrafine gold particles reduced on quartz surface form a coordination complex in the pulp systems, which are dissolved by iodization.
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