Method for processing sulphidic lead ores or sulphidic lead/zinc ores or sulphidic concentrates or mixtures thereof

摘要

The present invention relates to methods for processing polymetallic sulphidic raw materials, for example sulphidic lead ores or sulphidic lead/zinc ores or sulphidic concentrates or mixtures thereof. A method for processing sulphidic lead ores or sulphidic lead/zinc ores or sulphidic concentrates or mixtures thereof in the presence of fluxes with the addition of the recycled dust to the process by roast smelting thereof in a vertical flame in an atmosphere of technical grade oxygen with a degree of desulphurisation of 85 to 100 % and subsequent reduction of the lead from the melt obtained by means of a solid reducing agent is proposed, in which the roast smelting is carried out in the presence of fluxes with a calcium oxide/silicon dioxide ratio of 0.65 to 0.75, while the reduction of lead from the melt at a temperature of 1100 DEG C proceeds by filtration of the dispersed melt, obtained in the course of roast smelting in the vertical flame, with a layer of a carbon-containing material. The present invention can be used most effectively in the course of pyrometallurgic lead extraction and the production of oxidised zinc sublimates from a polymetallic raw material.