electrode furnace (charge 200 kilograms), constructed by the Swedish
engineer Ivar Rennerfelt.
At the present moment of writing (October 1914) there are alltogether
9 furnaces of this type installed at different places (Hallstahammar,
Ljusne, Svedala, Soderhamn, Trollhattan, Virsbo) in Sweden, the capacity
ranging between 2 0 0 and 1 0 0 0 kilograms.
At Guldsmedshyttan an electric furnace of ahout the same type as the
Rennerfelt-furnace has been running since 1913, producing steel specially
for-steel-castings.
The Manufacture of Alloys.
The electric manufacture of certain alloys used chiefly in the iron
industry has been carried on in Sweden since 1904. For this purpose
electrode furnaces of the same type as those used in the carbide industry
are employed.
The places where this manufacture exists are Domnarvet, Gullspang,
Kortfors, Mansbo, Sandsta (near Hagge), Trollhattan and Vargon (near
Vanersborg)’. At present (February 1913) there are at these places 1, 6 ,
2, 1, 1, 3, 6 furnaces respectively in work.
The output has been as follows (approximate figures):
Year Ferro-silicon Manganese-silicon
Tons Tons
1904 ...................H H 225
1905 . . . . . . . ■ . . 230 3
1906 . .'. . . . ................. 665 —
1907 - . 950
1908 . 1077 . 25
1909 .................................... 2 524
1910 .................................... 4 570 186 .
1911 ........................ 4104 472
1912 R R 5 984 1 028
191 3 .................................... 9 863 1375
At Mansbo since.. 1901 about 25 tons of 15 per cent ferro-silicon has been
yielded per year as a by-product in the manufacture of calcium carbide. -
At the Sandsta furnace, which was started in the middle of . August 1912, is
manufactured a potashiferous manure (electro-potash), in which ferro-silicon is
obtained as a by-product.
The ferro-silicon contains from 12 - to 96 %, as a rule about 50 % 0^
silicon, and the manganese-silicon contains from 20 to 30 % of silicon
and 70 down to 50 °/o of manganese.
The manufacture of other alloys, such as manganese iron and chrome
iron has- also occurred sporadically; at present there is a factory at work
at Trollhattan, where the last-named alloy is manufactured in electric
furnaces. In 1913 760 tons of chrome iron and 136 tons of silico-man-
ganese-aluminium-iron were produced in Sweden.
During the years from 1885 to 1907 chrome-pig-iron was made at
Gothenburg in a furnace of the Wittenstrom type heated with masut.