PROCESS FOR PREPARATION OF INORGANIC COLORANTS FROM MIXED RARE EARTH COMPOUNDS

摘要

The present invention provides a novel process for preparation of inorganic colorants form mixed rare earth compounds, which are directly obtained from the ore industry, without undergoing any separation, thereby enabling a cost reduction to the extend of 10-100 times. Colors ranging from brown, blue and green can be obtained by suitable doping with other metal ions.