Useful Information about Lead |
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acetic acid alloy ampere-hours antimonial lead antimony arsenic Babbitt metal basic lead sulphate Bismuth buildings bullets cable sheathing carbonate casket cast cent antimony cent lead cent tin Chemical lead chloride coating color containing copper corrosion resistance Courtesy electric truck electrolytic Eutectic Ewing Galloway extruded foil furnace gasoline glass glazing bars hard lead heat impurities Insoluble in water insulated iron joints lead acetate lead alloys lead chloride lead chromate lead compounds lead nitrate lead pipe lead sheath lead storage batteries lead-covered lead's lines litharge manufacture material melting point metallic lead mineral modern oxide pig lead pigment plumbic plumbite powder Insoluble railroad red lead red lead paint roofing rubber rust sheet lead silver sodium soft lead solder Soluble solution of lead steel storage batteries sulphuric acid surface tank telephone temperature toll cable tons of lead tubes Type metal weight white lead paint wires zinc
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Page 9 - Specifically, base bullion contains small amounts of gold, silver, copper, zinc, antimony, arsenic, bismuth and other impurities which must be removed in whole or in part by refining to produce a commercial lead. REFINING PROCESSES The most widely used refining process is the Parkes process. By this treatment the lead is first melted and allowed to cool below the freezing point of copper, which crystallizes and is removed by skimming. It then passes to a reverberatory or softening furnace where the...
Page 8 - ... most of their sulfur and to agglomerate the very fine flotation product. This agglomeration process is called sintering. The sintered concentrate, which is in the form of lumps, is then loaded into the top of the heated blast furnace with limestone and other suitable fluxes. Coke is used for fuel. A blast of air is admitted to the lower part of the furnace to aid combustion and to complete the formation of metallic oxides, which are reduced to metal by the coke and carbon monoxide present. The...
Page 16 - In the following list, each metal is electropositive to all that precede it, ie, two metals in contact in the presence of an electrolyte form a galvanic couple which tends to cause the more electropositive to be dissolved by electrolysis : Column headed "cobalt" follows column ending "Indium.
Page 8 - The blast furnace is then tapped so that the lead flows off into kettles or molds. In this form the lead is a semifinished product known as base bullion, which may contain small amounts of gold, silver, copper, zinc, antimony, arsenic, bismuth, and other impurities. As the molten metal from the blast furnace cools, some of the impurities, particularly copper, separate and form a scum, or dross, on the surface. The dross is skimmed off and the copper recovered from it. Other impurities are then removed...
Page 11 - Corroding lead is a designation that has been used for many years in the trade to describe lead which has been refined to a high degree of purity. Chemical lead has been used for many years in the trade to describe the undesilverized lead produced from Southeastern Missouri ores.
Page 1 - The earliest known specimen of lead, dating from before 3800 BC, is a figure found at the Dardanelles on the site of an ancient city called Abydos. This metal was evidently well known in biblical times for it is mentioned in Exodus and several other places in the Old Testament. In the excavated ruins of Pompeii, which was covered by volcanic ash in 79 AD, lead water pipes in almost perfect states of preservation have been unearthed. Today lead has a variety of commercial applications, including the...
Page 3 - ... 2000 BC, and again by the Romans in the third century BC Lead production flourished in Greece about 500 BC The deposits in Britain were operated during the Roman occupation and by the early Britons. One of the most important applications of lead was its general use for water pipes by the Romans; lead pipes, in almost perfect states of preservation, have been dug up in the ruins of Pompeii and Rome, and in England. Roman public baths were often completely lined with sheets of lead. Between AD...
Page 25 - Recently, some castings were made from an alloy of 80 per cent, copper, 10 per cent, lead, and 10 per cent, tin, with the addition of 0.5 per cent, of arsenic, instead of 0.5 per cent, of phosphorus. The castings were tinned with "half and half...
Page 22 - His formula was 88.9 per cent tin, 7.4 per cent antimony, and 3.7 per cent copper.
Page 17 - C. (621° F.) 7100 gm. cal., or 28-4 B.Th.U. 223 gm. cal. 8-2 Gm. Cal. . 0-117 . 0-092 . 0-083 . 0-081 . 0-077 . 0-074 . 0-038 . 0-037 . 0-036 0-0000265 per ° C. 0-0000293 per ° C. Mechanical Properties. Brinell number, 1 cm. ball, 30 sec., 100 kg. load : — Ordinary soft lead 3-2 to 4-5 Tensile strength — Soft lead : — (Extension rate of 0-2 in./in./min.) . . . 2000-2400 Ibs./sq. in. (Extension rate of 0-02-0-03 in./in./min.) . . 1980 Ibs./sq. in. Effect of temperature on tensile strength...