Abstract: An optimization method of extraction of copper from bioleaching solution bearing high iron using LIX984N as an extractant was proposed based on Taguchi method for SNR (signal noise ratio) and variance analysis of the extraction rate and baciextraction rate. The results showed that in the process of extraction the extraction agent volume fraction and the phase ratio (V(O)/V(A)) were important factors affecting SNR ， and their contributions to the extraction rate reached 32744%， and 34180%， respectively. Extraction time was a significant factor to SNR while pH value was an nonsignificant factor in the extraction process. The optimized parameters of the extraction process were as follow:extraction agent volume fraction 30%， volume ratio of organic material to water 2∶1， extraction time 600s and initial pH value 15. The phase ratio (V(O)/V(A)) and baciextraction time were significant factors to SNR while temperature was an nonsignificant factor in the baciextraction process. The optimized parameters of the baciextraction process were as follow:volume ratio of organic material to water 1∶2， baciextraction time 600s， and temperature 30℃. Through extraction—baciextraction—electrodeposition experienments under the optimized processing condition， the extraction rate and baciextraction rate of copper reached up to 9991%， and 9856%， respectively， while the current efficiency reached up to 92594%.

Key words: Taguchi methods, SNR(signal noise ratio), extraction, baciextraction, copper