质量控制图在铁矿石全铁含量测定中的应用

The Application of Quality Control Charts in the Determination of Total Iron Content in Iron Ores

采用三氯化钛还原法测定铁矿石中全铁,在期间精密度测量条件下获取不少于15组数据,通过计算平均值、移动极差均值、上、下控制线,以测定日期为横坐标,全铁含量检测值为纵坐标,用EXCEL绘制质量控制图,持续监控全铁检测系统。结果表明:质量控制图可以考察测量系统的质量状况和变化趋势,判断检测过程是否受控,确定检测结果是否符合要求,是实验室质量管理中一种有效的控制手段。

Determinating the total iron content in iron ores after reduction by titanium（III） chloride, no less than 15 groups of detection data were collected under intermediate precision condition, and general average, mean moving rang, upper and low control limit were calculated and then the quality control chart was constructed with EXCEL where the detection date was used as x-coordinate and the total iron content was used as y-coordinate. The quality control chart was used to monitoring the system of the determination of total iron content sustained, The results showed that： The quality control chart was one of the useful QC approaches to settle the problems such as monitoring the status and the change trend of the detecting system, judging whether the detecting system was under control or not, and determining whether the detecting data were in accord with the requirements or not.