目前钽铌矿的选矿多以重选为主，但重选法选别细粒钽铌矿的回收率非常低。
At present, most of Ta-Nb ores are processed by use of gravity concentration, with which the recovery of fine-grained Ta-Nb mineral is very low.
为了用重选法回收锡石，大厂锡矿需先用粗粒优先浮出硫化矿石，但分选比较困难。
In order to recover cassiterite by gravity separation, it is necessary to separate sulphide minerals from the Dachang cassiterite ores by coarse preferential flotation.
现阶段，我国细粒级黑钨矿的回收主要采用重选法，其中钨的回收率一般在45%以下，损失率较大。
Nowadays, gravity concentration is used to recover fine wolframite, but the recovery of wolframite is lower than 45%.
第三部分利用层次分析法对区域旅游节庆做出分析，根据权重选出区域内最有发展潜力的旅游节庆。
The third part give an analysis of regional tourism festivals by using AHP and select the most development potential of the local tourism festival according to weight scores.
第三部分利用层次分析法对区域旅游节庆做出分析，根据权重选出区域内最有发展潜力的旅游节庆。
The third part give an analysis of regional tourism festivals by using AHP and select the most development potential of the local tourism festival according to weight scores.
应用推荐