论文部分内容阅读
矿石中高含量锰铁的测定,一般均是取一样用高硫酸铵法测锰,另取一样用重铬酸钾法测铁,无疑,铁可得到相当准确的结果;但锰常会得到偏低的结果。卢康全建议在焦磷酸钠存在下用高锰酸钾电位滴定二价锰成三价。樊玉堃建议在磷酸溶液中将锰从二价氧化至三价,加入过量的亚铁,然后用高锰酸钾反滴定,避免了高硫酸铵法加热破坏过量高硫酸铵时引起高价锰分解使结果偏低的缺点,又避免了电位滴定法需要特殊仪器的缺点,且比上述任何方法都要快速;但测定的范围、条件、干扰物等均未见记载。本文补充了樊玉堃没有指出的问题,并进一步改进了该法,在滴定锰后连續测定铁,使之更能符合准、快、省的原则。
The determination of high levels of ferromanganese ore, are generally taken the same high-ammonium sulfate test of manganese, the other the same with the dichromate method of measuring iron, no doubt, iron can get quite accurate results; but often manganese will be low result. Lu Kang full recommended in the presence of sodium pyrophosphate potassium titration potential titration of manganese into trivalent. Fan Yu-kun suggested in the phosphoric acid solution of manganese from the divalent oxidation to trivalent, adding excess ferrous, and then titration with potassium permanganate to avoid high ammonium sulfate heating to destroy excess ammonium sulfate caused by high manganese decomposition of the results The disadvantage of low potential, but also to avoid the shortcomings of the potential titration method requires special instruments, and faster than any of the above methods; but the scope of the determination, conditions, interference, etc. were not recorded. This paper supplements the problems not pointed out by Fan Yu-kun, and further improves the method by continuously measuring iron after titration of manganese to make it more in line with the principles of accuracy, speed and province.