产速太慢，底层再次氧化，如镍层在金槽氧化(或金还原)，剥锡。
Production speed too slow, the bottom again, such as nickel oxide layer in gold slot oxidation (or gold reduction), peel tin.
用某溶剂作为金萃取剂，用某复合反萃还原剂在常温条件下进行一步还原；将箱式混合澄清槽经改进后作为萃取器。
A solvent was used as gold extractant and a sort of compound back extract reducer was used for reduction at one step in normal temperature.
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