铁矿石 评定质量波动的试验法

[中文适用范围]： 本国际标准规定了评估每种交易的铁矿石和每个处理厂的铁矿石质量变化的实验方法。 指定了两种不同的方法。 第一种方法是分析由多个成对增量组成的交错样本，这些增量是按照 ISO 3082 中规定的分层抽样或系统抽样交替采集和组合的。 第二种方法是收集和分析单个增量，然后使用变异方法分析数据。 使用交错样本涉及的工作较少，但使用变异函数可以更好地估计质量变化，从而更好地估计采样方差。 变差函数方法通常用于微调采样操作。 注：当流量几乎均匀时，实验方法可近似应用于时间基准采样。 [外文原描述]： This International Standard specifies experimental methods for the evaluation of quality variation of iron ores for each type of iron ore being traded and for each handling plant. Two distinct approaches are specified. The first is to analyse interleaved samples composed of a number of paired increments taken and combined alternately following stratified sampling or systematic sampling as specified in ISO 3082. The second is to collect and analyse individual increments and then to analyse the data using variographic methods. Using interleaved samples involves less work, but use of variograms provides a better estimate of quality variation and hence a better estimate of the sampling variance. The variogram method is usually used to fine tune a sampling operation. NOTE The experimental methods may be applied approximately to time basis sampling when the flowrate is almost uniform.