write the name of main ore of silver?
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The most common silver-bearing minerals recovered by flotation are argentiferous galena, native silver, argentite (Ag2S) and tetrahedrite (Cu,Fe,Ag) Sb4S3). Often these minerals float with the base metals such as copper and lead sulphides or are the primary target mineral (tetrahedrite).
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12th
Chemistry
General Principles and Processes of Isolation of Elements
Oxidation Reduction
Name the important ore of s...
CHEMISTRY
Name the important ore of silver. Write all the steps and reactions involved in the Cyanide process for the extraction of silver from its ore.
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ANSWER
The important ore of silver are Argentite (Ag
2
S) and Horn Silver (AgCl).
Extraction of Silver from ore by cyanide process: In this process the finely powered ore is concentrated by froth flotation process and then treated with dilute NaCN and a current of air is passed into the solution so that Ag present in the ore is converted into soluble sodium argento cyanide complex.
Ag
2
S+4NaCN⇒
Sodiumargentocyanidecomplex
2Na[Ag(CN)
2
]
+Na
2
S
The current of air passed into the solution oxidises Na
2
S formed in the above reaction into Na
2
S
2
O
3
,Na
2
SO
4
and S thus enables the above reversible reaction to proceed in forward direction.
2Na
2
S+2O
2
+H
2
O⟶Na
2
S
2
O
3
+2NaOH
4Na
2
S+5O
2
+2H
2
O⟶2Na
2
SO
4
+4NaOH+2S
Then the solution containing Na[Ag(CN)
2
] is treated with Zn dust so that Ag gets precipitated.
2Na[Ag(CN)
2
]+Zndust⟶Na
2
[Zn(CN)
4
]+2
ppt
Ag↓
Precipitated Ag is purified by electrolytic method. The cathode is pure silver, anode is block of impure silver and electrolyte is 6% AgNO
3
with 1% HNO
3
. On passing current, impurities get deposited at the anode and pure silver at the cathode. Zn and Cu remain in solution while Au settles down as anode mud.
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