Sizuo Kiriyama and Toshiya Kishi
It has hitherto been a common practice to fuse the sample materials such as acid steel slag, moulding sand and clay in a Ni crucible with fusion flux consisting of Na2CO3 and Na2O2 etc. by gas, or in an electric furnace, but this method has such defects as follows :
(1) Skilled technique is needed and many kinds of samples can not be treated at a time.
(2) Consumptive amount of Ni crucibles is considerable.
(3) The content of the crucible is contaminated with eroded Ni which has to be separated subsequently.
(4) The operation of fusion necessitates gas or electricity. In order to remedy these defects, an instant fusion method is performed by mixing a sample completely with Na2O2 and Na2C2O4 in a Ni crucible and igniting with a piece of fuse. By this method, the fusion may be completed in a short time without any skilled experience, and at the same time, the consumptive amount of Ni crucibles is decreased to such a degree as to be negligible. The usable life of the crucible is thus remarkably prolonged and also the analysing efficiency enormously increased by the facts that the amount of eroded Ni is quite minute and that neither gas nor electricity is needed in the process.
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