Magnetic separation of substances on the basis of the different surface charges thereof
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United States of America Patent
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Dec 11, 2012
Grant Date -
Dec 9, 2010
app pub date -
Nov 17, 2008
filing date -
Nov 19, 2007
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates to a process for separating at least one first material from a mixture comprising this at least one first material and at least one second material, which comprises the steps:
- (A) production of a suspension of the mixture comprising at least one first material and at least one second material and at least one magnetic particle in a suitable suspension medium,(B) setting of the pH of the suspension obtained in step (A) to a value at which the at least one first material and the at least one magnetic particle bear opposite surface charges so that these agglomerate,(C) separation of the agglomerate obtained in step (B) from the suspension by application of a magnetic field and(D) dissociation of the agglomerate separated off in step (C) by setting of the pH to a value at which the at least one first material and the at least one magnetic particle bear the same surface charges in order to obtain the at least one first material.
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