Rösthütte

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A roasting smelter is an independent production facility, usually operated together with a sulfuric acid factory , or part of a zinc smelter or a similar metal processing plant, for example a copper smelter. One example is the Wanheimer Metallhütte near Duisburg , which opened in October 1906 . There were other grate huts near the zinc huts in the Aachen district as well as in Datteln and Hettstedt .

The ovens for the roasting of sphalerite were operated or other ores, hot kilns . They were mostly so-called hand scooping ovens, which, as the name suggests, were fed by the oven workers by hand. The ore produced by the roasting process is called roasting blende and is fed to the zinc smelter for further processing. Another by-product is roasting gas , which with 5 to 6 percent by volume of sulfur dioxide is passed on to the sulfuric acid factory belonging to the Rosthütte.

A special type of roasting oven is the zinc muffle oven. In muffles heated to 1300 to 1500 ° C , a mixture of roasting blend and coal is added. The zinc oxide contained in it is converted into zinc vapor and carbon dioxide , with the zinc vapor condensing to liquid zinc, which is where the name condensation or distillation comes from (cf. Birkengangofen ).

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