Extraction of gold Au involves the formation of complex ions - X- and - Y- Gold ore C N - - H 2 O- O 2 Roasting H O - -X- Zn -Y-Au- X- and - Y- are respectively

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Cyanide or Macarthur Forrest Process

Extraction of...

Question

Extraction of gold $(A u)$ involves the formation of complex ions ' $X$ ' and ' $Y$ '.
Gold ore $R o a s t i n g - ---------- \to C N^{-}, H_{2} O, O_{2} H O^{-} +^{'} X^{'} Z n - ------------ \to^{'} Y^{'} + A u$
' $X$ ' and ' $Y$ ' are respectively

A u {(C N)}_{2}^{-}

and

Z n {(C N)}_{4}^{2 -}

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A u {(C N)}_{4}^{3 -}

and

Z n {(C N)}_{4}^{2 -}

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A u {(C N)}_{3}^{-}

and

Z n {(C N)}_{6}^{4 -}

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A u {(C N)}_{4}^{-}

and

Z n {(C N)}_{3}^{-}

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R o a s t i n g - -------- \to C N^{-}, H_{2} O, O_{2} H O^{-} + X Z n - \to Y + A u

roasted gold ore + C N^{-} + H_{2} O O_{2} - \to [X] + O H^{-}

[X] + Z n \to [Y] + A u

[X]

[Y]

+ C N_{(a q)}^{-} + H_{2} O_{2} [X] + [O H^{-}]

[X] + Z n \to [Y] + A u

Roasted gold ore + C N^{-} + H_{2} O O_{2} - \to [X] + O H^{-} [X] + Z n \to [Y] + A u

X

Y

+ C N^{-} + H_{2} O \to [X] + O H^{-}

[X] + Z n \to [Y] + A u

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