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The kinetics of leaching arsenic from Ni-Mo ore roasting dust was investigated.The effects including leaching temperature,particle size of the smelter dust,stirring speed,the coefficient β(the molar ratio of sodium chlorate to arsenic in the smelter dust)and the initial H+ concentration on leaching arsenic were studied.The results indicate that the leaching of arsenic increases sharply with the decrease of particle size.The orders of reaction with respect to H+ concentration and particle size are determinted to be 1.136 and-1.806,respectively.The leaching of arsenic reaches 99% under experimental conditions,the apparent activation energy is determined to be 11.157 kJ/mol,which is consistent with the values of activation energy for diffusion model.The kinetics equation of leaching arsenic from the roasting dust could be expressed by a semi-empirical equation as 1-2/3η-(1-η)2/3=k0(c[H+])1.136 r0-1.806 exp[(-11157/RT)t].
The kinetics of leaching arsenic from Ni-Mo ore roasting dust was investigated. The effects including leaching temperature, particle size of the smelter dust, stirring speed, the coefficient β (the molar ratio of sodium chlorate to arsenic in the smelter dust) and the initial H + concentration on leaching arsenic were studied. The results indicate that the leaching of arsenic increases sharply with the decrease of particle size. The orders of reaction with respect to H + concentration and particle size are determined to be 1.136 and-1.806, respectively.The. leaching of arsenic reaches 99% under experimental conditions, the apparent activation energy is determined to be 11.157 kJ / mol, which is consistent with the values of activation energy for diffusion model. kinetics equation of leaching arsenic from the roasting dust could be expressed by a semi-empirical equation as 1-2 / 3η- (1-η) 2/3 = k0 (c [H +]) 1.136 r0-1.806 exp [(- 11157 / RT) t].