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在黑钨精矿中,如果砒的成份佔0.7～1.5％以上者,称为高砒钨矿。黑钨矿与砒矿两者的不同点是:黑钨矿具有弱磁性,砒矿不具磁性。故一般都是利用这个物理差異,用磁力选矿法,将砒矿自黑钨矿中分离出来,而取得含砒合乎标准的黑钨精矿。但黑钨矿中,常共生有一部分白钨矿。白钨矿与砒矿一样,不具磁性,在磁选中,两者共同集中,形成大量的低钨尾砂,不易选揀出来,因此使WO_3的收回率低。根据磁选记録,WO_3的收回率一般只在90～93％之间,一部分白钨矿均损失于尾砂中。其次磁选时,须将矿品经过压碎、篩分等过程,手续繁复,亦能造成一部分的机械损失。
In the wolframite concentrate, if the pomfret composition of 0.7 to 1.5% or more, known as high-Tung tungsten ore. The difference between wolframite and mines is that wolframite is weakly magnetic and mined ore is not magnetic. It is generally the use of this physical difference, with the magnetic separation method, the ore is separated from the black tungsten ore, and obtain the standard black tungsten ore containing 砒. But wolframite, often symbiotic part of scheelite. Like scheelite, scheelite is nonmagnetic. In magnetic separation, the two are concentrated together to form a large amount of low-Tungsten tailings, which is not easy to pick and choose. Therefore, WO3 recovery rate is low. According to the magnetic separation records, WO_3 recovery rate is generally only 90-93%, part of the scheelite loss in the tailings. Followed by magnetic separation, the mineral must be crushed, screening and other processes, complicated procedures, but also can cause some mechanical loss.