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. 1898 Excerpt: ...Furnaces.--The White furnace consists of a long cast-iron revolving cylinder, lined with fire-brick, and inclined towards the fire end. The cylinder is bound by four cast-iron rings which rest on friction wheels, serving as supports, and it is revolved by other friction wheels driven by a shaft and pulleys. Crushed ore ...
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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. 1898 Excerpt: ...Furnaces.--The White furnace consists of a long cast-iron revolving cylinder, lined with fire-brick, and inclined towards the fire end. The cylinder is bound by four cast-iron rings which rest on friction wheels, serving as supports, and it is revolved by other friction wheels driven by a shaft and pulleys. Crushed ore is fed into the furnace continuously at the upper end, passes through it by gravity, and is continuously and automatically discharged by falling into a pit through an opening in the floor close to the fire. The time occupied by the ore in passing through the furnace depends on the angle of inclination of the cylinder which can be changed, so that the time of roasting can be shortened or lengthened according to the nature of the ore. Ores containing a high percentage of sulphur require to be subjected to heat for a longer time than those with little sulphur, and the angle of inclination is reduced in such cases. The average inclination is about one in twenty. The cylinder is lined with fire-brick throughout, and projecting bricks raise portions of the ore and drop it through the flames, thus assisting the oxidation. The advantages claimed for this furnace are that it is continuous in its operation, discharging its product regularly into the pit at the lower end, and this roasted ore can be allowed to accumulate and be withdrawn as required. The ore is submitted to a gradually increasing temperature, the most favourable conditions for dead roasting being thus obtained. The usual size of this furnace is about 4i feet in diameter and 27 feet long, the capacity being usually stated at from 20 to 30 tons per day. When employed for the dead roasting of pyritic ores its capacity is less, and in some cases the passage through a 27-foot cylinder is ins...
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Add this copy of Metallurgy of Gold to cart. $20.00, very good condition, Sold by Eastburn Books rated 5.0 out of 5 stars, ships from Albany, OR, UNITED STATES, published 1986 by Met Chemical Research.
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Seller's Description:
Very Good. No Jacket. Book VG red hardcover. NO jacket. 1986. Previous owner's name on front paste down, other wise pages all clean. Diagrams throughout. Binding solid. 573 pp.
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