The kinetics of copper preciPitation by H2S from sulfate solutions wer
e investigated by bubbling the ps through an aqueous solution. It was
observed that the rate of precipitation increases as the solution pH i
ncreases. It was shown that the reaction rates and mass transfer coeff
icients were increased by either increasing the ps flow rates with con
stant bubble diameter or by decreasing the bubble diameter at constant
ps flow rates. This was due to the increased interfacial area between
the ps and liquid phases. The average diffusion coefficient of H2S wa
s calculated from the experimental data and was found to be 1.987.10(-
9) m2 s-1, which is very close to that in water (1.61.10(-9) m2 s-1).