A new method-dry High Gradient Magnetic Separation (HGMS)-to remove iron from ultrafine kaolin powder is described. A new kind of disperser, which breaks down the
The phase diagrams of the binary systems RECl<sub>3</sub>-MCl<sub>n</sub>(M=Li,Mg,Ca,Pb;n=1 or 2)were investigated bymeans of DTA and X-ray diffraction analysis.I