his also applies to the drive train mounted on the B4-CH-16-A Bevel-helical speed reducer B4

Flender/Flender Gear Units/Bevel-helical speed reducer B4

that the following waste products,forexample,can aKo be smeltedeconom- ically by the QSL process: tion of further metallurgical principles. energy consumption and ecological compatibility. large-scale industrial plants. - Sulphurous Pb, Ag residues from the pressure leaching of zinc electrolysis (tonnage in the FRG: approx. 5,0 tpa) - Residues containing PbS0 from jarosite treatment - PbS0 sludges from the chemical industry - Other waste products containing Pb 9 2. Working steps - Testing of the QSL process as an ecologically compatible lead smelting process in contin- uous operation While maintaining the level of ecological compatibility achieved up to now, the long-term behaviouroftheQSLprocess is to be investigated usingvariousleadconcentratesandconven- tional fuels and reducing agents as regards: Stability of the mason Service life of the nozyes Consumption of utilities Composition of the slags Environmental technology and work safety, etc. - Smelting increasing fractions of secondary raw materials and waste products containing Pb After obtaining positive results in continuous operation trials with conventional lead concen- trates, increasing fractions of secondary materials are to be smelted. Sulphurous secondary raw materials are primarily involved in this case. The goals of the trials corres ond to those of PhaseA,withspecialattention naturallybeing paidtothespecialchemicalanc(physica1 proper- ties of the secondary raw materials. Atotal of approx. 2,0 conventional Pb concentrates of various origins, and approx. 2,0 secondary raw materials of various compositions were processed during the continuous operation demonstration phase. 3. Results The scientifically oriented studies primarily included the problems associated with the flow behaviour of the slag in the reactor, the chemical and physical rocesses in the area of the reducing nozzles, and the fundamental metallurgical conditions & obtaining the lowest pos- sible residu