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Transactions of the INDIAN CERAMIC SOCIETY   Vol. 05  1946
Determination of Alumina in Chrome Ore and Chrome-Magnesite Refractories.
H. P. Samanta and N. B. Sen
Pages : 101-103
DOI : 10.1080/0371750X.1946.10877804
Abstract
One of the general methods used in the opening out of Chrome ore and Chrome refractory products for analysis is fusion with Na20a. Aluminium Oxide in these materials is estimated from water extract 1, 2, 3, · 4, after filtering and precipitating the aluminia by boiling the filtrate with NH,Cl. The well washed precipitate is ignited, SiOa separated by Potassium bisulphate fusion, after which Al203 is determined in the usual way. It has been found, however, that either complete solution of AlaOs is uncertain or some sodium aluminate hydrohses during boiling, so that some of it remains unaccounted for if the water insoluble residue left! after· NatOa fusion is not looked for it. Probably, on this account, in the A. S. T. M. standard methods5 , the entire peroxide fusion is treated with Hydrochloric acid and AlsOa determined from the filtrate after separating the SiOa. The present investigation was, therefore, undertaken to determine whether the residue as stated above, contains any alumina and if it does, the method under . consideration would give accurate results only, when the constituent was looked for both in the filtrate as weir as in the residue.
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