基于田口法的生物浸出液萃铜工艺的优化

基于田口方法，提出了采用萃取剂LIX984N从高铁生物浸出液中萃铜工艺的优化方法，对萃取率及反萃率进行信噪比分析和方差分析.结果表明，萃取过程中，萃取剂体积分数和相比对萃取率的贡献率较大，分别达到32744%，34180%，时间为较重要因素，pH值对信噪比影响较小.优化后的工艺参数:萃取剂体积分数为30%，相比(V(O)/V(A))为2∶1，时间为600s，pH值为15；反萃过程中，相比及时间为显著因子，温度为不显著因子.优化后的工艺参数:相比(V(O)/V(A))为1∶2，时间为600s，反萃温度为30℃.在优化后的条件下进行萃取—反萃—电积实验，萃取率达到9991%，反萃率达到9856%，电流效率达到92594%.

Optimization of Extraction of Copper from Bio-leaching Solution Based on the Taguchi Methods

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%.