Froth Flotation (Sulphide & Oxide)

Froth Flotation (Sulphide & Oxide) 2017-04-04T06:57:31+00:00
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​Fluorite Depressant (3 replies)

Maya Rothman
2 years ago
Maya Rothman 2 years 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

JohnnyD
2 years ago
JohnnyD 2 years 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
2 years ago
Bill Fraser 2 years 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.

JohnnyD
2 years ago
JohnnyD 2 years 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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