等几种分选效率计算公式中,均包含有计算项(β_m)——纯矿物(或称理论精矿)品位。由于β_m 难以准确求得,使得上述公式实际应用的能力大大减低。β_m 的准确值难以求得的原因主要是:1.绝大多数选矿厂所进行的“选矿”,选的都是“矿物”,并非选“金属”。然而选矿厂实际生产中,化验分析却是“金属”,并非“矿物”。分 And several other sorting efficiency calculation formula, contains a calculated term (β_m) - pure mineral (or theoretical concentrate) grade. As β_m difficult to accurately calculate, making the practical application of the formula greatly reduced the ability. The exact value of β_m difficult to obtain the main reasons are: 1. The vast majority of beneficiation plant carried out “beneficiation”, the election is “mineral”, not the election “metal.” However, the actual production of concentrator, laboratory analysis is “metal”, not “mineral.” Minute