Patent ID: 11878937
Assignee: HERAEUS QUARZGLAS GMBH & CO. KG
Field: Materials, metallurgy (Chemistry)
Classification: CPC C  B | IPC B  C

Claim 0:
1. A process for the refinement of a quartz powder, comprising
separating microparticles of refractory minerals out of the quartz powder by an elutriation step, wherein the microparticles of refractory minerals comprise minerals containing rare earth metals and/or thorium and/or uranium; and
carrying out the elutriation step in a fluidised bed reactor, in which a controlled upward flow of a liquid elutriation phase is provided, by which the microparticles of refractory minerals are carried upwards in the fluidised bed reactor;
whereas the quartz powder remains in the lower region of the fluidised bed reactor.