Abstract: The invention relates to a magnet apparatus for generating a magnetic field, the magnet apparatus comprising: at least three coils arranged besides each other along a first axis in a first plane, wherein each coil comprises a conductor comprising a material having superconducting properties at an operating temperature, the coils further comprise two legs and two bent end sections in the first plane, wherein a first and a second leg are arranged parallel to each other along a second axis in the first plane transverse to the first axis, and the two bent sections are arranged opposite to each other; and a controller arranged to control currents through the respective coils to obtain a current distribution in the first plane, wherein a current direction of the current distribution is alternating between opposite directions parallel to the second axis, with a period A along the first axis. The invention also related to a magnetic density separation apparatus comprising the magnet apparatus.

Abstract: A magnetic density separator comprising a process channel through which in use magnetic process liquid and particles to be separated flow in a flow direction, a magnetization device that is arranged to extend in flow direction along at least one of the walls of the channel so as to in use apply a magnetic field to the process liquid in a separation zone of the channel to establish a cut density of the magnetic process liquid to separate the particles in the process liquid based on their density, a laminator through which the magnetic process liquid is introduced into the channel to flow laminarized in flow direction along the separation zone, and a feed through which a mixture of process liquid and particles to be separated is introduced into the process channel to join the laminarized process liquid, characterized in that the feed includes an entraining device.

Abstract: The invention relates to a magnet apparatus for generating a magnetic field, the magnet apparatus comprising: at least three coils arranged besides each other along a first axis in a first plane, wherein each coil comprises a conductor comprising a material having superconducting properties at an operating temperature, the coils further comprise two legs and two bent end sections in the first plane, wherein a first and a second leg are arranged parallel to each other along a second axis in the first plane transverse to the first axis, and the two bent sections are arranged opposite to each other; and a controller arranged to control currents through the respective coils to obtain a current distribution in the first plane, wherein a current direction of the current distribution is alternating between opposite directions parallel to the second axis, with a period ? along the first axis. The invention also related to a magnetic density separation apparatus comprising the magnet apparatus.

Abstract: A magnetic density separator includes a process channel, a magnetization device, a laminator, and a feed including an entraining device. The process channel may permit magnetic process liquid and particles to be separated to flow through in a flow direction. The magnetization device may be arranged to extend in flow direction along at least one of the walls of the channel and to apply a magnetic field to the process liquid in a separation zone of the channel to establish a cut density of the magnetic process liquid to separate the particles in the process liquid based on their density. The laminator may be configured to introduce magnetic process liquid into the channel to flow laminarized in flow direction along the separation zone. The feed may introduce a mixture of process liquid and particles to be separated into the process channel to join the laminarized process liquid.

Abstract: A planar magnet for magnetic density separation, comprising an array of pole pieces succeeding in longitudinal direction of a mounting plane, each pole piece having a body extending transversely along the mounting plane with a substantially constant cross section that includes a top segment that is curved to distribute the magnetic field associated with the top surface of the pole piece such that its strength transverse to the mounting plane is substantially uniformly distributed in planes parallel to the mounting plane, the curved top segments having a width (w) in longitudinal direction of the mounting plane and a maximum height (h) transverse to the mounting plane, wherein the top segments of successive pole pieces are unequal in height and/or width.