From: Company QC    

Currently rare earth sulfide production technology is relatively mature, the product performance is relatively stable, but the domestic standards for product testing and analysis methods of rare earth sulfide standard has not been established. My company as the only domestic production of rare earth sulfides an R & D enterprise, the establishment of analysis and testing methods for the establishment of the mission and has a sacred responsibility standards.

    Three commonly used rare earth sulfide sulfide, polysulfide and other miscellaneous phase, so the determination of rare earth sulfide sulfur important to control their production and quality. The commonly used high-frequency infrared carbon and sulfur analyzer method and barium sulfate gravimetric method for the determination of sulfur content in its measurement. However, due to the detection range of the instrument, the determination of high content of sulfur, often need to reduce sample weight or diluted with a solvent, which can introduce large errors lead to the measurement result unstable. The gravimetric method is cumbersome, long experimental process, not suitable for fast analysis. And in the rare earth sulfide is often accompanied by a small amount of unreacted synthesis reaction completely elemental sulfur impurities, high frequency infrared carbon and sulfur analyzer measurement method and barium sulfate gravimetric method employed results contain the content of the rare earth ions and impurities sulfide sulfur elemental sulfur Therefore measurement results are generally high. QC company after years of detection and analysis of rare earth sulfides, developed an indirect iodometric method, only its sulphide content determination to avoid the influence of rare earth sulfide sulfur impurities on the results, so the results satisfactory, simple and fast method that can be used daily production analysis

Recently, this method has been written into the QC papers, and had adopted a national core journals metallurgical analysis of the audit, expected to be published in February. This is just the company forward in the study of rare earth sulfide analysis a small step, the company will continue to increase this year, research and analysis of the performance of rare earth sulfide detection methods, perfect for the establishment of a rare earth sulfide product standards as soon as possible, to fill the domestic paint industry on vulcanization cerium product-related information and data gaps, promoting industry-standard optimal allocation of resources, and guide the healthy and rapid development of the industry.