Spon, Ernest, Haldane, Robert, Lock, Charles G. Warnford (Charles George Warnford), 1853-1909 · London ; New York : E. & F.N. Spon · leaf 416
tion is avoided, the reduction tization, of the nickel and cobalt. In of the oxides thus formed is readily general, reverberatory furnaces are used achieved. The roasted matters are for the roastings ; but for rich speiss, smelted in another blast furnace 10 ft. the first roastings are done in… … sulphides;, are subjected to a series of the form employed at Hopfriesen. The roastings and fusions: the nickel and speiss once concentrated, the fusion is cobalt are at once united by the first sometimes exchanged for a roasting in fusion in a new product termed "speiss," a "Hungarian " furnace,…
Workshop recipes · Technology · Industrial arts
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