铁矿石、锰矿石和铬矿石取样和样品制备技术概况

我国钢铁工业的主要原料铁矿石、锰矿石和铬矿石进口量大,对外依存度分别在80%,55%,95%以上,贸易中经常发生质量纠纷,有些质量纠纷的焦点为取样和样品制备技术。从影响样品代表性的角度概述了铁矿石(包括直接还原铁和热压块)、锰矿石和铬矿石取样和样品制备所涉及的方法标准、品质波动、样品部位、最小份样数、最小份样量、缩分方法、最小留样量和设备的技术要求,分析了取样和样品制备中存在的问题,提出了确保取样和样品制备人员能正确执行方法标准、采取有代表性样品应采取的措施。

General situation of sampling and sample preparation technology of iron,manganese and chromium ores

The main raw materials of the iron and steel industry were iron ore,manganese ore,and chromium ore,which had a large dependence on foreign dependence of 80%,55%,and 95%in China.Quality disputes often occured in trade,and some quality,the focus of the dispute was on sampling and sample preparation techniques.From the perspective of affecting the representative sample,the technical requirements for the method standards,quality variation,sample locations,minimum number of increments,minimum quality of increments,division method,minimum mass of divided sample and equipment involved in sampling and sample preparation were introduced.The problems in sampling and sample preparation were analyzed,and the measures to ensure that sampling and sample preparation personnel can correctly implement method standards and take representative samples are put forward.