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在用粉煤直接还原炼铁的产品中,铜在铁中的存在形态主要是金属铜,也有由于工艺不当和使用含硫的原料而形成的少量氧化铜:硫化铜:亚铁酸铜,以及未能转化的结合氧化铜。在用化学分析方法进行分相测定时,试样中金属铜与硫化铜的分离,目前尚无成熟的方法。有的溶剂是两相兼溶,选择性不强,还因缺乏和不易制备与试样相同的纯化合物作为标样,以验证分析方法的可靠性等,均给分析工作带来一定的困难。为此,我们通过双样分析,采用不同的分离手段,测得不同的共相结果,经过互相扣减计算的办法,较好地解决了铁中铜物相分析工作中的难题。按分析流程图所示,第一份试样测得金属铜、硫化铜(A),自由氧化铜(B),结合氧化铜、亚铁酸铜(C)。第二份试样测得金属铜、自由氧化铜(D),结合
In the case of direct reduction ironmaking with pulverized coal, copper is predominantly metallic copper in iron, with minor amounts of copper oxide formed as a result of improper processes and the use of sulfur-containing feedstock: copper sulfide: copper ferrite, and Unbound copper oxide. In the chemical analysis of phase separation, the sample of copper and copper sulfide separation, there is no mature method. Some solvents are two-phase soluble, the selectivity is not strong, but also because of the lack of and difficult to prepare the same sample with the pure compound as a standard sample, in order to verify the reliability of analytical methods, all to the analysis of certain difficulties. For this reason, we adopted different methods of separation to measure different common-phase results through double analysis and subtraction calculation to solve the difficult problem of copper phase analysis in iron well. As shown in the analytical flow chart, the first sample was tested for metallic copper, copper sulfide (A), free copper oxide (B), copper oxide combined, and copper ferrite (C). The second sample measured copper metal, free copper oxide (D), combined