The Flotation Process

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Herbert Ashton Megraw
McGraw-Hill book Company, Incorporated, 1916 - Flotation - 249 pages
 

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Page 193 - Anaconda concentrating plant, it was not known whether pebbles or steel balls should be used for grinding. To provide for this uncertainty a compromise was effected. The mills were made 10 by 4 ft. and built sufficiently strong for steel balls in case balls were used. Each mill was equipped with a 225-hp. motor directly connected through a flexible coupling. The mill filled with pebbles takes from 95 to 115 hp. to operate. In case steel balls were used it was planned to put in a false wood lining...
Page 190 - Sections 2 through 8. MILLING DIVISION The ore is fed from the bins to a 2-in. round-hole shaking screen, the oversize going to a 12 by 24-in. Blake crusher. The product from this crusher is delivered to a 2-in. round-hole trommel, the oversize of which is sent to two 8 by 20-in. Blake crushers. The product from these crushers, together with the undersize from the 2-in. screens, is elevated and passed through 1-in. round-hole trommels. The oversize from this is treated in coarse Harz jigs, making...
Page 193 - Separation machines are pf gun metal and are driven by bevel gears from a line shaft, the direction of rotation of the agitators alternating. The machines are made of California red wood; the agitator boxes are further lined with hard maple extending about 18 in. from the bottom of the box. Each machine has an individual drive, power being supplied to the line shaft by a 150-hp. motor running at 385 rpm The speed of the agitators is 225 rpm and as the impellers are 18 in. in diameter the peripheral...
Page 192 - Section 1, the undersize from the %-in. trommel is screened on 1% by 12-mm. trommels, the undersize going to the Anaconda classifiers and the oversize to the Hancock jigs. The treatment of the products from this point is the same in all sections, except that Section 1 uses tube-mills in place of Hardinge mills for grinding, as noted previously. The undersize from the %-in. trommel is screened through 4-mm. trommels, the oversize from these going to the double compound Evans jigs and the undersize...
Page 195 - The mechanism consists of a revolving disk to which are attached, around the circumference, a number of cups. This disk is set vertically so that its lower edge dips into a pan of acid or oil. As the cups come around they are filled and later discharge their contents into a suitable launder leading to the flotation machine. The disk is driven by the friction of a wheel against another disk attached to the main drive. The wheel is run at constant speed and by varying the point of contact between wheel...
Page 124 - MONT. (Arizona Meeting, September, 1916) I. EXPERIMENTAL FLOTATION CONCENTRATION INTRODUCTION EARLY in 1914 it was decided to test, on a fairly large scale, the treatment by flotation of Anaconda slime and mill tailing. For this purpose a standard-type Minerals Separation machine was installed at the Washoe Reduction Works during May and June, 1914. This was followed by the installation of a full-size Callow pneumatic machine plant. Experiments were also made, on a smaller scale, with the Froment,...
Page 137 - Cu, and the concentrate low grade, 47.5$ insoluble. It is evident from the work in this and the preceding period that turpentine will not give us good results in a neutral circuit. (e) Mixtures of Coal Tar, Creosote and Pine Oil Added Ahead of Grinder. Neutral Circuit. — The tests during Periods 36 and 37 show a tailing of 0.13$ Cu, and a low-grade concentrate, — 45.3$ insoluble.
Page 129 - No. 1 machine when treating slime as produced from the mill at present (May 1, 1915) seems to be from 80 to 90 tons. 2. The best combination of reagents for the treatment of slime seems to be sulphuric acid, kerosene sludge acid, wood creosote and stove oil. There is some question as to the real value of the stove oil. Its principal function seems to be to make a more compact froth. 3. It would not be economical to retain the round tables as the recovery by treating the slime directly by flotation...
Page 133 - ... treatment of the slime. 3. Treatment of Mixture of Round-Table Feed and Mill Tailing after Grinding through 60 Mesh These tests were made in the MS No. 1 machine. It was thought that it might be of advantage to mix the slime and the reground mill tailing for flotation treatment. The acid sludge kerosene, turpentine and the sulphuric acid used were added in the flotation machine. In some instances, various mixtures of coal tar (70 to 80 per cent.), creosote (17.5 to 22.5 per cent.), and pine oil...
Page 193 - The concentrate is sent to the dewatering bins, together with the fine jig concentrate, and the middling is sent to the 10 by 4-ft. Hardinge mills. The overflow from the Anaconda classifiers is sent to the slime thickener division, consisting of 28 by 3-ft. Dorr tanks.

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