Question

Which of the following ore is concentrated using group 1 cyanide salt ?

• A. Sphalerite
• B. Calamine
• C. Siderite
• D. Malachite

Answer 1

Answer: (A)

Sphalerite ore : $ZnS$

Calamine ore : $ZnC{O}_3$

Siderite ore : $FeC{O}_3$

Malachite ore : $Cu(OH{)}_2\cdot CuC{O}_3$

It is possible to separate two sulphide ores by adjusting proportion of oil to water or by using 'depressants'. In case of an ore containing $ZnS$ and $PbS,$ the depressant used is $NaCN$.