Abstract: A process of treating complex sulfide concentrate includes the steps of roasting wet or slurried complex sulfide concentrate in a furnace at a temperature of at least 720° C. to obtain a calcine; smelting the calcine under inert or oxygen free atmosphere in a smelting furnace to obtain a matte, and optionally granulating the matte to obtain a granulated matte.

Abstract: A process of treating complex sulfide concentrate includes the steps of roasting wet or slurried complex sulfide concentrate in a furnace at a temperature of at least 720° C. to obtain a calcine; smelting the calcine under inert or oxygen free atmosphere in a smelting furnace to obtain a matte, and optionally granulating the matte to obtain a granulated matte.

Abstract: A method for processing slags containing iron and non-ferrous metals, to produce clean slag free of detrimental substances and non-ferrous metals and suitable for use as a raw material or construction material. Slag is reduced in a reduction furnace with the help of reducing agents so that at least 5% of the iron of the slag is reduced into metal. Some of the non-ferrous metals, such as zinc, lead, arsenic and cadmium, vaporize. The contents of the reduction furnace are continuously mixed to prevent separation of a metallic phase from the slag. The generated slag-metal mixture is tapped off from the reduction furnace, cooled, crushed and ground to a finer size. Finally, a metal fraction is separated from a clean slag.

Abstract: The invention relates to a method for processing slags of non-ferrous metallurgy, containing iron and valuable metals, to produce clean slag that is free of detrimental substances and valuable metals and suitable as it is for use as a raw material or construction material. Slag is reduced in a reduction furnace (18) with the help of reducing agents (19) so far that at least 5% of the iron of the slag is reduced into metal. At the same time, some of the valuable metals, such as zinc, lead, arsenic and cadmium, vaporize. The contents of the reduction furnace (18) are continuously mixed to prevent separation of a metallic phase from the slag. The generated slag-metal mixture (21) is tapped off from the reduction furnace (18), cooled, crushed and ground to a finer size. Finally, a metal fraction (26) is separated from a clean slag (25).

Abstract: The invention relates to a method for the recovery of gold from a gold-containing chloride solution using activated carbon. The gold-containing solution and the carbon are contacted with each other, after which the gold that has formed as metallic particles on the surface of the carbon is separated from the carbon using physical methods as gold concentrate that contains metallic gold.