MetallurgyHard
Question
In the cyanide extraction process of silver from argentite ore, the oxidising and reducing agents used are
Options
A.O2 and CO respectively
B.O2 and Zn dust respectively
C.HNO3 and Zn dust respectively
D.HNO3 and CO respectively
Solution
The reactions involved in cyanide extraction process are:
Ag2S + 4NaCN → 2Na [Ag(CN)2] + Na2S
(arg entite ore)
4Na2S + 5 [O2] + 2H2O → 2Na2SO4 + 4NaOH + 2S
(oxidi sin g agent)
2Na [Ag(CN)2] + Zn → Na2 [Zn(CN)4]+ 2Ag ↓
(reducing agent)
Ag2S + 4NaCN → 2Na [Ag(CN)2] + Na2S
(arg entite ore)
4Na2S + 5 [O2] + 2H2O → 2Na2SO4 + 4NaOH + 2S
(oxidi sin g agent)
2Na [Ag(CN)2] + Zn → Na2 [Zn(CN)4]+ 2Ag ↓
(reducing agent)
Create a free account to view solution
View Solution FreeMore Metallurgy Questions
Which of the following is(are) regarded as iron ores?...Which of the following is not an ore:...In the commercial electrochemical process for aluminium extraction, the electrolyte used is :...Egg shell is made up of a chemical. In which of the following ores this chemical is present ?...For extraction of sodium from NaCl, the electrolytic mixture NaCl + KCl + CaCl2 is used. During extraction process, only...