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​Fluorite Depressant (3 replies)

Maya Rothman
11 months ago
Maya Rothman 11 months ago

Fluorite flotation: please anybody suggest good depressants for silica and calcite in fluorite flotation.

My specs are now:  Raw fluorspar has CaF2 =60%, CaCO3=19.5% and SiO2=9.7%, I am already using water glass, pH=10, with oleac acid as collecter. Concentrate has CaF2=88.7%, eliminated silica to 0.43% but still there is CaCO3 about 5%. I have reviewed http://www.min-eng.com/commodities/nonmetallic/fluorspar/refs.html

11 months ago
JohnnyD 11 months ago

Few minerals get trapped in bigger size bubbles of 1 to 4 inches dia. The entrapped bubbles space will carry such unwanted minerals--found mechanically trapped. We have developed innovative solution for such problems:

  • 1mm bubbles production and injecting in Column Cell of 10 meter ht with 1.5 meter dia.
    bubble is washed with water drops falling on them and wash inter-spaces to remove trapped unwanted minerals.
  • Manual operation is very costly and less efficient. All controls are through PLC or DIDC.
    finding right solution plant needs to audited technically. ( SSE GOA R&D)

Bill Fraser
11 months ago
Bill Fraser 11 months ago

The classic depressant for silica is sodium silicate. Look at the flotation reagents used in phosphate flotation as flourite and apatite behave very similar.

11 months ago
JohnnyD 11 months ago

Many people failed to depress silica. The answer for Natalia's comment, is that we do not have 100% pure silica, it is in interlocked form. It also behaves like fluorite due to interlocking. Fine grinding is not suggested as it can develop more sub-micron particles and reduce flotation rate. If you can give 100% data on your concentrate produced we can give better solution.

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