method and device for the removal of harmful components in the treatment of leichtmetallschmelzen with chlorine or chlorine gases from exhaust gases

摘要

999,645. Separating particles from gases by filters ; washing gases. E. WEISSE. Jan. 31, 1962 [Jan. 31, 1961], No. 3758/62. Headings B1R and BIT. In a process for separating noxious gaseous, vaporous and pulverulent constituents from waste gases evolved in the furnace treatment of metals and metal alloys the waste gases are drawn from a space above the melt into a duct and a carrier gas is introduced into the duct, the carrier gas cooling the waste gases and/or conveying these to means whereby the noxious constituents are cooled and condensed, and the dust particles so formed together with the residual gases are fed into a filter or washing assembly, the velocity of the gases being maintained by suction means connected to the filter or washing assembly and being sufficient to prevent the noxious constituents from precipitating on the walls of the duct or the means for cooling and condensing. As shown in Fig. 6, the melt 2 is disposed in a container 1 having a gas-tight cover 3 extending from which is a duct 5 leading to a cooler 6 and a filter 8. A pipe 7 is provided for the carrier gas and the suction means is a radial pump 12. A gaseous treating agent is fed through a duct 4 having at its outlet a nozzle assembly or a baffle plate. The cooler is dispensed with if the carrier gas cools the waste gases sufficiently. The radial pump 12 may be replaced by a liquid operated injector, Fig. 8 (not shown), the liquid of which removes any noxious constituents passing the filter 8. The latter may be replaced by a washing tower, the liquid of which circulates in a closed circuit containing a cooling and treating plant. A washing tower may be connected downstream or upstream of the filter.