我国有世界上最丰富的钨锰铁矿资源,其中多数伴生有铌、钽等稀有元素。钨精矿经碱熬提取钨后,留下大量的矿渣。矿渣中铌、钽含量比原精矿提高好几倍,通常为千分之几至百分之二。遵照毛主席“综合利用很重要,要注意”的教导,不少单位正在对钨矿渣的综合利用进行研究试验,有的已开始投入生产。在试验和生产过程中,提取铌、钽是其中最重要的一个项目。含钨矿样中氧化铌含量的测定,过去使用硫氰酸 China has the world’s most abundant wolframite resources, most of which are associated with rare elements such as niobium and tantalum. Tungsten concentrate by alkali boil after extraction of tungsten, leaving a lot of slag. Slag in the niobium, tantalum content than the original concentrate to improve several times, usually a few thousandths to two percent. According to Chairman Mao’s “comprehensive utilization is very important to pay attention to” teaching, many units are on the comprehensive utilization of tungsten slag research test, and some have begun to put into production. In the testing and production process, the extraction of niobium, tantalum is one of the most important project. Determination of niobium oxide content in tungsten ore samples, the use of thiocyanate