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冰铜及炼铜炉渣中测定铁,由于铜、砷、锑等含量较高,通常是预先使铁成氢氧化物沉淀分离的经典重铬酸钾法。该法虽然可靠,但流程较长,尤其是蒸发浓缩时容易受外来沾污,引起误差,且需用有毒试剂氯化高汞。本文拟定的无汞快速测铁方法,是以王水预先将铜、砷、锑等杂质元素氧化成高价后,在6N硫酸介质中,有铜盐催化及甲基橙作还原指示剂条件下,在热溶液中用硫酸亚钛将铁定量地还原,再以重铬酸钾法滴定。试验证明,铜100,种、锑、钨、钖锡各50,秘20, 铬、锰各10,钼
Determination of iron in copper matte and copper smelting slag, due to the high content of copper, arsenic, antimony, etc., is usually the classic potassium dichromate method to precipitate iron hydroxide into a precipitate. Although this method is reliable, the process is relatively long. In particular, it is susceptible to external contamination when evaporating and concentrating, causing errors and chlorinating high mercury with toxic reagents. In this paper, the rapid mercury-free determination of mercury method is based on the pre-aqua regia of copper, arsenic, antimony and other impurity elements into high prices, in 6N sulfuric acid medium, copper salt catalysis and methyl orange as a reduction indicator, Iron is titrated quantitatively with dilute sulfuric acid in a hot solution and then titrated with potassium dichromate. Test proved that the copper 100, species, antimony, tungsten, tin tin each 50, secret 20, chromium, manganese each 10, molybdenum