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LEACHING pH (1 reply)

6 months ago
emanus 6 months ago

in pH maintenance/controlling, why lime is most preferable in VAT leaching than caustic soda?


6 months ago
David 6 months ago

Hi, Lime is cheaper more readily available than Caustic Soda.

As a pH Regulator Agent: In the lab, the addition of lime makes easier to control the pH.

Sodium Hydroxide is a powerful caustic agent and could be more difficult to add small dosages to maintain a pH value. Also, sodium hydroxide could leach some gangue minerals (e.g. silicates) and the pregnant solution could be contaminated.

Sodium hydroxide can cause other potential downstream processing issues, however it can be useful when there are viscosity issues with lime.

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