Copper, lead, silver, goldMacmillan and Company, Limited, 1898 - Metallurgy |
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Common terms and phrases
24 hours according alloy Altenau amalgam amount anode antimony argentiferous bath black copper blast furnaces bottom calcination carbon cast-iron cathode cent charcoal charge chloridising roasting coal coarse copper coke consumption containing converted copper matte copper sulphate crucible cupellation cupric cuprous chloride cuprous oxide decomposed desilverising diameter dissolved employed extraction feet 6 inches ferric ferrous chloride ferrous oxide ferrous sulphate flue Freiberg fuel galena gases gold heaps hearth heated impure inches of mercury latter Lautenthal layer lead lime liquation liquor litharge melted mercury metal method mill molten obtained operation ounces oxidised plates portion pots precipitated present produced pyrites quantities reduced refining residue reverberatory furnaces salt separated shaft furnaces shown in Figs silicate silver chloride silver sulphide slag slimes smelting sodium solution stamp sulphide sulphide of copper sulphur dioxide sulphuretted sulphuric acid tank temperature thiosulphate tons treated tuyeres vats vessel volatilised whilst work-lead zinc
Popular passages
Page v - ... while at the same time pointing out the scientific principles underlying each process, and illustrating each by examples drawn from actual practice.
Page 3 - Hampers recent experiments, to be that (H5 per cent, does not affect the malleability of copper in any way ; with 0'3 per cent, of lead it becomes slightly red-short, and with O4 per cent, .slightly cold-short.
Page v - SCHNAKFL is professor of metallurgy and chemical technology at the Royal Academy of Mines at Clausthal, and his work has long enjoyed a well-deserved reputation. Prof. Henry Louis, who translates it, points out that it is a curious fact that there does not exist in the English language a single complete treatise on metallurgy.
Page v - Metallurgy. Such being the position of our literature of this subject, I venture To think that I am rendering the English metallurgist a distinct service in submitting to him a translation of the most recent and most exhaustive work on the subject in any language, from the pen of that eminent metallurgical authority, Dr.
Page 827 - ... is so different from all the former ideas on the subject that some of the tests were carefully duplicated with practically the same results. Specifications for work involving the use of cement mortar always provide that it shall be used within a certain time after it has been mixed, generally from half an hour to an hour and a half, according to the character of the work and the nature of the particular cement. This is because it is considered that cement mortar should be in its permanent place...
Page 275 - ... bluish-gray color and a dull metallic luster, which is lost on exposure to the air, the surface becoming dull gray. It is soft enough to be indented with the nail and can be cut with a knife, the softness of the metal increasing with its purity. It can be rolled into thin sheets, and, by previous heating, can be "squirted...
Page 1 - Copper ia distinguished from all other metals by a peculiar red color, which is pinkish or yellowish on the fresh fracture of the pure metal, but inclines to purple in the case of copper containing cuprous oxide. The fracture of cast copper is hackly granular; in forged or rolled copper it is fibrous and shows a pale red silky luster. Copper crystallizes in the cubic system. Specific gravity: Pure crystalline copper, 8.940; electrodeposited copper, 8.914; cast copper, 8.921; rolled and hammered copper,...
Page 2 - When cast in moulds, copper has the property of rising and becoming porous. Sound castings can only be obtained by means of special precautions, such as pouring at the lowest possible temperature, the addition of lead before pouring, or pouring in an atmosphere of carbon dioxide.
Page 21 - ... the concentrating process is converted into crude copper by partial roasting followed by fusion in reverberatory furnaces. The converting process is not applied to ores, but is usually employed to reduce to coarse copper the matte "produced by either the blast-furnace or the reverberatory process. It consists in blowing a highly subdivided stream of air under pressure through molten matte which is contained in a pear-shaped or cylindrical converter lined with quartz ore material. The matte to...
Page 200 - ... solution. Extraction 71.7 percent. (E. and MJ, Vol. 96, No. 24, Dec. 13, 1913, p. 1107.) 4. Chloride Processes. The chloride processes have been widely applied. Hydrochloric acid presents certain advantages over sulphuric acid in technical application. Hydrochloric- acid is less apt to form basic salts, and therefore yields solutions that contain but little free acid and which constantly require less iron for the precipitation of copper. Hydrochloric acid is usually more expensive than sulphuric...