The Flaxseed-Ore of Wisconsin. [Volume: 8, Issue: 4, 1889, pp. 244-250]

246 UNITED STATES ASSOCIATION OF [Voi,. 8,
local name, "flaxseed-ore." These grains are held together by a
cementing material which was believed to contain most of the lime,
silica and alumina found to be carried by the ore; but some investigations by Mr. F. H. Foote, Superintendent of the Northwestern
Iron Company's blast-furnace at Mayville, Wisconsin, appear to
prove that the cementing material, as well as the grains of ore,
contain most of the component parts as shown by the above analysis. Mr. Foote took samples of the ore for analyses, and then
washed portions of them so as to have only the grains remaining
with little or no cementing material. The first three determinations were made by three different chemists of the ore as minedthey are marked Al, B1, C1. The next three are analyses of the
same samples after washing-A2 being the washed ore from Al,
B2 the washed ore from B1, etc.:
ANALYSIS OF IRON RIDGE ORE, WISCONSIN.
Ore as Mined. Washed Ore.
Al. Bl. Cl. A2. B2. C2.
Iron.................. 50.95 50.10 Undet. 49.40 49.89.........
Alumina............ 2.27 4.02 4.05 2.14 3.76 3.79
Silica................ 3.86 4.55 4.38 4.11 4.33 4.35
Phosphorus......... 1.35 0.81 1.60 1.81 0.85 1.88
Sulphur........... Undet. 0.01 Undet. Undet. Undet. Undet.
Lime................ 6.28 I 5.66
Magnesia............ " 1.11 1.36
Volatile Matter
Carbonic Acid, 11.19 i ( 11.86
etc.............
Moisture.......... 1.25......... 0.67
Analyses Al and A2 by Davenport Fisher, Milwaukee; B1 and
B2 by Union Steel Works, Chicago; C1 and C2 by F. H. Foote,
Mayville, Wis.
The tendency of the ore to "run ahead " of the balance of the
charge in the blast-furnace encouraged its use with other ores, and
satisfactory work was obtained using 50 per cent. of the Iron Ridge
ore, although the other ores charged were soft hematites, and consequently composed largely of fine ore.
The location of this deposit, 50 miles north of Milwaukee,