How many of the following metallurgies involve leaching? (i) \( \mathrm{Al}_{2} \mathrm{O}_{3} \....

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How many of the following metallurgies involve
\( \mathrm{P} \)
leaching?
(i) \( \mathrm{Al}_{2} \mathrm{O}_{3} \rightarrow \mathrm{Al} \);
(ii) \( \mathrm{Ag}_{2} \mathrm{~S} \rightarrow \mathrm{Ag} \);
(iii) \( \mathrm{Au} \rightarrow \mathrm{Au} \);
(iv) \( \mathrm{CuFeS}_{2} \rightarrow \mathrm{Cu} \);
(v) \( \mathrm{PbS} \rightarrow \mathrm{Pb} \)
(vi) \( \mathrm{MgCl}_{2} \rightarrow \mathrm{Mg} \);
(vii) \( \mathrm{FeCO}_{3} \rightarrow \mathrm{Fe} \);
(viii) Low grade copper ore \( \rightarrow \mathrm{Cu} \);
(ix) \( \mathrm{HgS} \rightarrow \mathrm{Hg} \)


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