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An electromagnetic separator for mineral powders

Published online by Cambridge University Press:  14 March 2018

A. F. Hallimond
A. F. Hallimond*
Affiliation:
Museum of Practical Geology, London
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Extract

The separator here described was designed by the author some years ago in order to avoid the tedious process of hand-picking mineral powders in front of an electromagnet. It is a complete machine dealing on a laboratory scale with the less magnetic minerals, such as monazite. For research it is essential that the separation should be clean cut ; in the present case a 90% separation of glauconite from monazite can be made in a single pass, while the removal of more widely differing minerals is complete. The machine must also deal with small samples down to 0.5 gram without loss; this necessitates a small scale and slow feed ; the time required for more bulky samples is consequently rather long, but little or no attention is required during operation. Finally, all the moving parts should be of metal and easily cleaned.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 22 , Issue 130 , September 1930 , pp. 377 - 381
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1930

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References

page 377 note 1 Communicated by permission of the Director.

page 377 note 2 Exhibited at the meeting on November 9, 1915, Min. Mag., 1916, vol. 18, p. xxiv.

page 377 note 3 S. J. Truseott, Textbook on ore dressing, 1923.

page 378 note 1 British Patent No. 930, 1873 (J. R. Francis).

page 378 note 2 It need hardly be said that contact must be made when the magnet is above a gap. An early model was submitted direct from the maker to an independent expert, who formally reported that he had obtained a certain inadequate con centration of magnetic mineral. When, after some weeks, the present author was able to see the machine it was found that none of those concerned had realized the above essential condition: the commutator was set so that all magnetic material was redeposited on the shelves and the only mineral that had ever reached the magnetic hoppers was pushed off mechanically when the shelves were overloaded.

page 380 note 1 A suitable switch is made by Messrs. Isenthal, Ltd., Victoria Road, London, W. 3.

page 380 note 2 T. Crook, in appendix to F. H. Hatch and R. H. Rastall, Petrology (sedi mentary rocks), 1st edition only, 1907, p. 366.

page 380 note 3 Ksanda, C. J., Journ. Opt. Soc. Amer., 1926, vol. 13, pp. 713–715.CrossRefGoogle Scholar

page 380 note 4 Reproduced by B. W. Holman, Mining Magazine, 1927, vol. 37, p. 85.

page 381 note 1 If much magnetite is present, it is worth while to remove most of it first with a hand magnet.