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目前,钼精矿(大多是从銅钼矿床的矿石中精煉出来的)是提取铼的主要来源之一。在某些钼精矿中,铼的含量极高,可达0.02～0.10％。氧化炤燒是处理此种精矿的第一个工序。在空气充足的条件下,使物料加热,就会形成七氧化铼;相反,如果空气稀薄,則可产生低价氧化铼。如果钼精矿焙燒,温度介于550～600°之間,那么,由于七氧化铼的蒸汽具有很大的压力(沸騰溫度Re_2O_7=363°),七氧化铼就会和气流一起蒸發及消失。铼蒸發度的高低与否,須視焙燒的条件如何而定,首先是取决于在焙燒的过程中空气是否过剩。在不久以前还是用馬弗爐及人力扒矿的方法来焙燒钼精矿的一座煉鋼厂中,精矿中的铼蒸發了約65～67％。在1956年,一座稀有金属工厂掌握了沸騰焙燒
Currently, molybdenum concentrates, mostly refined from ores of copper-molybdenum deposits, are one of the major sources of rhenium extraction. In some molybdenum concentrates, the rhenium content is extremely high, up to 0.02 to 0.10%. Oxidation is the first step in the processing of such concentrates. Under sufficient air conditions, the material is heated, the formation of rhenium heptoxide; the contrary, if the air is thin, you can generate low-priced rhenium oxide. If the molybdenum concentrate is roasted and the temperature is between 550 and 600 °, rhenium hectoride evaporates and disappears with the gas stream due to the high pressure of the steam of rhenium heptoxide (boiling temperature Re 2 O 7 = 363 °). The level of rhenium evaporation depends on the conditions of the roasting, first of all depending on whether the air is excess during the roasting process. Not long ago, in a steelmaking plant where molybdenum concentrates were roasted in muffle and manpower, rhenium in the concentrate was evaporated by about 65-67%. In 1956, a rare metal factory mastered boiling roasting