DE452783C - Refinement of sulfidic ores of easily fusible heavy metals by means of silicon or silicides - Google Patents

Description

Smelting sulphidic ores of easily fusible heavy metals by means of Silicon or silicides. In the 452,08 patent; is a process described, ores, ore and metallurgical products containing oxides of lead, antimony, bismuth and tin, by means of silicon or silicides in a slag bath to the corresponding metals to reduce.

It has now been found in further experiments that also Sulfur-containing ores of the metals mentioned, especially those containing lead and antimony or bismuth, and ore and metallurgical products containing such sulphides without prior roasting of the sulfur directly within a suitable iron oxide-containing one Smelt slag bath with silicon or silicides to the corresponding metals permit.

The process of these reactions is similar to that of the known one so called precipitation work, with the difference that in the present process the reactions between metal sulphides, the iron oxide of the slag and silicon are strongly exothermic, while in the previous reduction by carbon considerable amounts of heat had to be supplied.

The reactions proceed as follows: PbS -j- a Fe0 = 2Pb0 + 2 FeS and z Pb0 + Si - 2 Pb + Si02 or z Fe0 -f- Si = 2 Fe --f- Si02 and 2 Fe + 2 Pb0 = 2 Fe0 + 2 Pb For 1 kg of reduced lead, -1- 2-14 WE are developed.

The heat generation in this process is therefore so important that it sufficient, cold ores with a sufficiently high metal content entered into the slag bath still with an increase in the temperature of the slag bath and simultaneous slagging reduce the impurities to metal.

In the manner of the main patent, poorer ores can be preheated be introduced into the slag bath to remove the larger amount, gangue and impurities slagging with the exothermic reaction.

The sulfur content of the ores is different in the process an iron-rich stone that contains only small amounts of lead or antimony, from the bath, similar to the blast furnace process.

The great advantage of the new process compared to the previous reduction processes for lead and antimony ores, where a previous removal of the sulfur by Roasting and sintering is required in order to be able to smelt them in the blast furnace, lies in the absence of this preparatory work. The ores can e.g. B. when fine flotation products are present that are difficult to roast and sinter, with the new process without further Prepare to be smelted directly on metal.

Claims (1)

PATENTATISPRUCtt Process for the direct smelting of sulphidic or predominantly sulphide-containing lead, antimony or bismuth ores, ore-like and metallurgical products with contents of such metal sulphides on the corresponding metals measured in patent 452 087, characterized in that the sulphurized ores etc. in a Baths of iron-containing slag are introduced cold or preheated together with silicon or silicides, with exothermic reactions between metal sulfide, iron oxide content of the slag and silicon or silicide, the corresponding metal separating with simultaneous slagging of the impurities and gangue and the sulfur content of the ore high ferrous stone forms.