Floating diamonds with nanomagnetic particles
In the diamond industry, ferrofluids are used in ferrohydrostatic separators for the density separation of diamonds from gangue material The size of the magnetic core of the coated particles forming the ferrofluid suspension is vital in ensuring the stability of the fluid. The particle size must be small enough such that sedimentation does not occur in a magnetic field gradient and under the influence of a gravitational field and such that magnetic agglomeration can be overcome. This paper discusses the particle size requirements for fluid stability under the influence of these effects. © 2005 International Union of Pure and Applied Chemistry.