. Electrical world. rict, with special reference to thesaving of the sulphur and iron, as well as of nickel and copper con-tained in the ore. It was decided to hand-sort the ore at the rockhouse using the grade higher in copper and gangue for the ordinarymatte smelting, and the grade low in copper and gangue, but highin sulphur and nickel for the ferro-nickel industry. Since thislatter ore with its high sulphur content requires a large excess ofbasic admixture which, however, results in a slag too refractory tobe kept fluid by the blast furnace heat, it was decided to try anelectric furnace pr
. Electrical world. rict, with special reference to thesaving of the sulphur and iron, as well as of nickel and copper con-tained in the ore. It was decided to hand-sort the ore at the rockhouse using the grade higher in copper and gangue for the ordinarymatte smelting, and the grade low in copper and gangue, but highin sulphur and nickel for the ferro-nickel industry. Since thislatter ore with its high sulphur content requires a large excess ofbasic admixture which, however, results in a slag too refractory tobe kept fluid by the blast furnace heat, it was decided to try anelectric furnace process. He describes various preliminary experiments. The final furnaceused is shown in Fig. 2, and contains a rectangular water-jacketed we may almost say always the ignorance of to-morrow. Power onlycomes to him who can build continuously while sweeping aside fromhis foundations the structures so fondly thought stable; and begin-ning anew, mount each time higher and higher with a more and morestable FIG. 2.—SJOSTEDT FURNACE. body case, A B. with refractory lining, AB>, provided with a slagnotch, H, vent holes, a, and stroke holes, b, a water-jacketed bot-tom frame, C, held removably on that body, and provided with arefractory lining on a plate, O, screwed to that frame, and havinga tapping hole, /, provided in one of the ends; a cover of refractorymaterial, D, having feed and vent holes, d and (P-, and opening forthe electrode: an upper electrode, K, and a bottom electrode, L,embedded in the bottom lining, C, and its ends in contact with themetallic frame of the bottom. In this furnace ferro-nickel was made for several days from poorly-roasted ore (with about 3 per cent, sulphur and about 53 per cent,iron) at the rate of 60 pounds per hour with an electric energy of108 kw. With a furnace of 300 or 500 hp, which would be moreeconomical, 200 hp would probably suffice for obtaining a gross tonof ferro-nickel per 24 hours. He gives an estimate of the cost fro
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
