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Kinetics analysis of leaching lead from lead residue in NaCl-HCl solution

In order to provide a theoretical basis to improve the leaching rate of lead in lead residue, the kinetics of leaching lead in NaCl-HCl solution were investigated with the shrinking core model for the reaction of liquid-solid. The effects of temperature, brine concentration, particle size and liquid-solid ratio on the leaching lead were studied. The results show that the leaching process is controlled by the surface chemical reaction, and the apparent activation energy is determined to be 45.239 k J/mol. The kinetics equation can be expressed by a semi-empirical equation according to the experimental data. The leaching speed and the leaching rate of lead are increased by increasing the brine concentration, temperature, liquid-solid ratio and decreasing the particle size of sample.