Laboratory Testing & General Mineral Processing Engineering

Laboratory Testing & General Mineral Processing Engineering 2017-04-04T06:57:51+00:00
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Improve Goethite Concentrate Grade (5 replies)

JohnnyD
2 years ago
JohnnyD 2 years ago

Anyone could share the experience in Processing to improve the Iron total grade in Goethite? Any input will be highly appreciated.  The Goethite content and the total Iron grade varies across the samples.  First issue is to improve the total Iron. Second issue is the Phosphorous and Al2O3 are too high for Iron and steel manufacturing feed. Other mineral presents are also vary between samples but the most difficult to treat is consist of Goethite, Berlinite and Quartz.

Bob Mathias
2 years ago
Bob Mathias 2 years ago

Best option may be reduction roasting followed by magnetic separation. However detailed mineralogical analysis is necessary to confirm the gangue minerals. If you can improve the iron grade magnetically then it maybe viable

Is it from a hydrothermal vein? Quartz/berlinite should be able to be gravity seperated.

Have you considered magnetic roasting?

JohnnyD
2 years ago
JohnnyD 2 years ago

Bob, what do you mean by magnetic roasting?
PS: it's not response to magnetic separator.

Bob Mathias
2 years ago
Bob Mathias 2 years ago

I never did any test on it myself, but goethite can be reduced to maghematite at a certain temperature (cant recall exact temperature) but this increase magnetic susceptibility and if you have high LOIs you can loose those volatiles also.

I have recently dealt with some ochreous goethite that has high aluminas, which tend to give the ore a low relative density which in turn causes poor separation based on density alone. we tested spirals and up current classifiers. it would be useful to XRD the material to understand the mineralogy.

JohnnyD
2 years ago
JohnnyD 2 years ago

What is the typical Iron total grade after roasting plus magnetic separator can be achieved? How about the Phospor content? Any one know where or what mineral, is the Phospor typically locked

Victor Bergman
2 years ago
Victor Bergman 2 years ago

It depends on the dissemination size of goethite.

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