At which pH should I do zinc recovery from rayon plant?

24 May 2021 0 7K Report

I am doing zinc effluent precipitation from rayon plant. I am following ENKA's method by doing 2 stages precipitation. However, I could not get high concentration of Zn in the filtrate phase by doing precipitation at pH 6. I tried different pHs but the result is quite similar at any pH.

Can anyone explain why it happened and recommend the next step I should take?

Thanks

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