How is copper extracted from low grade copper ores?

Explanation

Copper is extracted by hydrometallurgy. The low grade ores are leached with an acid (i.e., dil. `H _ 2 SO _ 4 ` ) when metal goes into solution as ` Cu ^(2 + ) ` ions.
` " " ` Low grade copper ore ` overset ( H^(+)) to Cu^(2 + ) (aq)`
Copper metal is then obtained by treating the ` Cu ^( 2+ ) ` ions solutions with either scrap iron or ` H_ 2 ` gas. Since ` E ^(@) ` of ` Fe^( 2 + )//Fe ` ( - 0`*`44V) or that of ` H ^(+)//H_2`(0`*`0 V) redox couple is lower than that of ` Cu^( 2 +)//Cu ( + 0 *34 V ) `, therefore, ` Fe or H_ 2 ` can displace Cu from ` Cu^( 2 + ) ` ions
` " " Cu^( 2 + ) (aq) + Fe (s) to Cu (s) + Fe ^( 2 + ) (aq) , `
` Cu^( 2 + ) (aq) + H _ 2 (g) to Cu(s) + 2 H ^( + ) (aq) `