NaCN is sometimes added in the froth floatation process as depressant when ZnS and PbS minerals are — Metallurgy and Isolation of Elements Chemistry Question
Question
NaCN is sometimes added in the froth floatation process as depressant when ZnS and PbS minerals are expected because :
Answer: B
💡 Solution & Explanation
Depressant is a substance that is added to suppress the floating characteristic of metal sulphide present as an impurity.<br>PbS + ZnS (impurity) $\xrightarrow{4NaCN}$ Na2[Zn(CN)4] (Soluble complex) + PbS
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