目前国内选矿试验的数据整理,大部分采用四位有效数字(即取小数点后二位)。如某铁矿物的精矿产率为45.37％,精矿品位为62.48％,回收率为92.69％。个别的还有取小数点后三位的,如某铜精矿品位为24.819％。这种表示法形式上好像精确、整齐、美观·而实际上往往会给人以虚假的概念。 At present, the data processing of the beneficiation test in China mostly uses four significant digits (that is, two digits after the decimal point). For example, the iron ore concentrate yield is 45.37%, the concentrate grade is 62.48% and the recovery rate is 92.69%. In addition there are three decimal places, such as a grade of 24.819% copper concentrate. Such representations are as formal, precise, neat and beautiful as they are, and in fact they often give false notions.