Method and apparatus for extracting high-purity molybdenum oxide powders and nanopowders from low-grade concentrates

摘要

A method and plant for molybdenum recovery from a low-grade crude ore by low-temperature chlorination, where the molybdenum-bearing fine ore is chlorinated with gaseous chlorine at a temperature of 220-250° C. to form a volatile chloride compound, which after leaving a reactor is directed to a low-temperature nitrogen-oxygen plasma unit having a temperature of 800-1000° C., wherein the said compound decomposes and turns into a high-purity MoO₃ powder or nanopowder, which is cooled with an air stream and collected in a dumping hopper. The invention enables recovery of ultra-high purity MoO₃ (purity of 99.997-99.999%) using an environmental friendly, cost effective, and inexpensive method implemented on an industrial scale.