Laboratory Testing & General Mineral Processing Engineering

Laboratory Testing & General Mineral Processing Engineering 2017-03-23T09:50:31+00:00
  • To participate in the 911Metallurgist Forums, be sure to JOINLOGIN
  • Use Add New Topic to ask a New Question/Discussion about Mineral Processing or Laboratory Work.
  • OR Select a Topic that Interests you.
  • Use Add Reply = to Reply/Participate in a Topic/Discussion (most frequent).
    Using Add Reply allows you to Attach Images or PDF files and provide a more complete input.
  • Use Add Comment = to comment on someone else’s Reply in an already active Topic/Discussion.

LEACHING pH (1 reply)

11 months ago
emanus 11 months ago

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


11 months ago
David 11 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.

Please join and login to participate and leave a comment.