GB142157A - Improvements in and relating to methods and apparatus for the oxidation of tin, and the production of tin oxide, the improvements being also applicable for the treatmentof zinc and zinc-containing materials for the production of zinc oxide - Google Patents

Abstract

142,157. Maconochie, H., and Ros, D. de. Oct. 30, 1918. Tin and zinc oxides.-Oxides of tin and zinc are produced by employing a blast of air under high pressure, say 4 or 5 lb., into the melted metal, and a blast of air under low pressure, say 0.15 to 0.5 lb., above the surface of the metal, auxiliary heating by an oil burner being employed if necessary. The oxide is carried off by the blast and collected. The apparatus consists of a tilting furnace a on trunnions b, Fig. 1, or rollers g<1>, Fig. 3, having an oil burner c, which may be of the kind described in Specification 17853/14, [Class 75 (i), Burners &c.], a low-pressure blast d or d<1>, and a high-pressure blast e, which may be provided with a rod c<3> to keep the opening clear. In the arrangement shown in Fig. 1, the furnace is heated and charged while horizontal, and is then tilted as shown in dotted lines to bring the open end a<3> opposite the low-pressure blast d and submerge the high-pressure blast. In the arrangement shown in Figs. 2 and 3, two high-pressure blasts e' are provided at opposite sides, the furnace being tilted so that first one and then the other is submerged. A screen a<9> is arranged below the burner c, and a baffle a<10> directs the flame downwards. Ingots a<11> of metal are fed in beneath the screen a<9> without allowing the fumes to escape. In an arrangement of this kind, the low-pressure pipe d<1> may be dispensed with, the opening a<3> then being plugged, and the low-pressure blast is sent in through the burner c. The temperature can then be controlled by regulating the proportions of air and oil admitted through the burner. Specifications 118,664 and 118,665 are referred to.