Boliden Aktiebolag

Boliden Contech A. B.

Bjorn K Lindquist

Stig A Petersson

Erik E Solbu

The invention relates to a method for extracting dioxins and like highly toxic, organic contaminants from a gas. The invention is characterized by contacting the gas with a liquid aerosol over a pre-determined period of time, and by electrically charging the particles present in the aerosol, both solid and liquid particles, and subsequently separating the particles from the gas, preferably with the aid of a wet electrostatic precipitator.

Method for separating dioxins from gases

The invention relates to a method for producing metallic lead from lead-containing starting materials by an oxidizing smelting process and subsequent reduction of the resultant oxidic molten bath. The reduction is effected with solid carbonaceous reduction agent present in the melt, and it is ensured that solid carbonate-containing material, preferably limestone, dolomite or soda ash, is also present in the melt, together with the reduction agent. The method can be applied for working-up lead-starting materials of sulphidic, oxidic or sulphatic kind. In addition, the method can be applied to advantage for working-up lead-carbonate containing starting materials, where at least a part of the carbonate-containing material may comprise lead-starting material.

Method for producing metallic lead by direct lead-smelting

The invention relates to a method for producing blister copper from copper-iron sulphide concentrates, and particularly from concentrates whose sulphur content is insufficient to effect autogenous smelting of the concentrates to matte. The invention is characterized in that the concentrate, together with slag former, is smelted with oxygen-gas or air rich in oxygen in a top blown rotary converter, to form a mixture of a contaminated copper metal phase, magnetite and fayalite slag, whereafter a reductant, preferably coke, is supplied for the reduction of magnetite while supplying heat. After the reduction process, the slag is separated from the formed copper metal phase, which is then refined to blister copper in a manner known per se. In this respect, a preferred method of refining the copper metal phase, or black copper, is to refine the black copper, subsequent to separating the slag, in the converter by an oxidizing process with the addition of a further slag former, to form blister copper and a slag containing oxidized impurities from the ingoing copper metal phase.

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Skelleftehamn, Sweden

Bjorn K Lindquist