The results obtained by Ebler are suggestive.
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Any method, however, that will shorten this somewhat tedious process should be welcomed. It is claimed that this conversion can be improved if the heating is done under pressure in an iron tank, although the authors have not tried this method. If three parts of sodium carbonate dissolved in water is boiled with one part of radium-barium sulphate, a considerable part of the sulphate is converted into carbonate at one treatment. The carbonate is then dissolved in chemically pure hydrochloric acid and filtered, and any insoluble material is worked up with the next batch of sulphate.
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It involves, however, considerable labor and much filtering and washing, as the radium-barium carbonate obtained must be washed completely free from traces of sulphate. The old method of boiling the sulphates with a solution of sodium carbonate in order to obtain radium carbonate and sodium sulphate is one that can be applied to any radium barium sulphate. Old Method of Treating Radium-Barium Sulphates The proportion of radium in these sulphates has averaged about 1 milligram of radium metal per kilogram of total weight. As a rule, the sulphates obtained contain at least 85 per cent BaSO4, and in much of the product the proportion of barium sulphate present is as high as 90 per cent. This is one of the advantages possessed by the process described in this report.
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Therefore, any process for the treatment of carnotite or pitchblende that involves the precipitation of a high-grade, clean sulphate has a great advantage over other processes involving the precipitation of the sulphate along with silica or allowing the sulphate to remain in the residue with silica and other impurities. The first step in this direction is to obtain a high-grade sulphate, as sulphates containing a considerable amount of silica and other impurities are not nearly as readily treated as those that are comparatively pure. In order to produce 5 to 10 grams of radium metal per year, it is absolutely necessary to have shorter methods of handling the sulphates than were used in the early days of radium refining. 20) can be readily appreciated on reading the account of their work. The tediousness of the process used by Haitinger and Ulrich (see p. If the sulphates can not be handled as rapidly as produced, the actual amount of radium refined each year must necessarily be much below the capacity of the plant itself. The first treatment of the radium-barium sulphates is of great importance, as the whole capacity of the plant, as far as the radium goes, depends upon this first treatment. Accumulation of Radium in Laboratory Crystallizing System.
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