Question:
Which of the following ore is concentrated using group 1 cyanide salt ?
Which of the following ore is concentrated using group 1 cyanide salt ?
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Cyanide salts are also used in the leaching of Gold and Silver (MacArthur-Forrest process) to form soluble cyano-complexes.
Updated On: Feb 12, 2026
- Calamine
- Malachite
- Siderite
- Sphalerite
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The Correct Option is D
Solution and Explanation
Step 1: Group 1 cyanide (NaCN) is used as a depressant in froth floatation.
Step 2: Sphalerite (ZnS) often contains Galena (PbS) as an impurity.
Step 3: NaCN reacts with ZnS to form a soluble complex $Na_2[Zn(CN)_4]$, preventing it from forming froth, while PbS goes to the froth.
Step 2: Sphalerite (ZnS) often contains Galena (PbS) as an impurity.
Step 3: NaCN reacts with ZnS to form a soluble complex $Na_2[Zn(CN)_4]$, preventing it from forming froth, while PbS goes to the froth.
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