Ore dressing Volume 4

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1909 Excerpt: ... 4. Two bins having a combined capacity of 95 tons. From (3); deliver, via chute, to (5). 5. Four log washers in pairs. From (4) and (8); deliver concentrates to (6) and tailings to (8). 6. Four trommels with 0.187-inch round holes. From (5); deliver oversize to blast furnace and undersize to (7). 7. Four stationary inclined screens with 14 meshes to the inch. From (6); deliver oversize to blast furnace and undersize to (9). 8. Two stationary inclined screens with 0.187-inch round holes. These screens are used alternately. From (5); deliver oversize to (5) and undersize to (9). 9. Johnson mechanical sand shoveler. From (7) and (8); delivers coarse sands, via cars, to (10) and fine silt and water to (13). 10. Bin. From (9); delivers, via feeder, to (11). 11. Trommel with 4 meshes to the inch to remove any sticks, leaves, etc., which may get into the pulp. From (10); delivers oversize to waste and undersize to (12). 12. Richards' annular classifier. From (11); delivers spigots to blast furnace and overflow to waste. 13. Settling pond. From (9); settlings and water arc both allowed to go to waste. From January 1 to June 1, 1906, the mill handled 30,957.16 tons. Of this, 18,602.04 tons of blast furnace ore were extracted by the log washers and 1,207.40 tons were recovered by the classifier, giving a total extraction of 19,809.44 tons or 64% of the original weight. The ore from the mine averaged 30% iron and the concentrates averaged 45% iron. The tailings ran 10% in iron. The mill runs 10 hours per day, 6 days per week, except the classifier, which runs 24 hours per day. The labor required is 7 men, 6 around the log washers and 1 around the classifier. Power. Power is now supplied by an electric motor run by electricity obtained from a generator at the furnace ...