Abstract
The comprehensive methodology for the zinc extraction from sulfide compounds into the oxide form with possible further reduction to metal is presented in this study. It was demonstrated in laboratory conditions during sludge treatment with Zn and ZnO obtaining. The remaining silicate products. It is proposed to recycle this material into Portland cement clinker to ensure a waste-free process.
 Keywords: zinc sulfide, zinc oxide, sludge recycling, Portland cement clinker, waste-free recycling
Highlights
In its conditions a carbon-containing material is added to the raw mixture, which provides zinc oxide reduction and its sublimation at 1100 ∘C
The waelz process is based on the zinc oxide reduction to metal zinc using a carbon-containing material by reaction (1): 2ZnO + C = 2Zn↑ + CO2↑
In some technogenic formations, such as synthetic fibers production sludge from, zinc is in sulfide form (ZnS)
Summary
The waelz process is based on the zinc oxide reduction to metal zinc using a carbon-containing material by reaction (1): 2ZnO + C = 2Zn↑ + CO2↑. Sulfur removal from zinc sulfide forms is possible by oxygen purging, while sulfur is removed as gas (SO2), and zinc passes into the oxide form by reaction (3): 2ZnS + 3O2 = 2ZnO + 2SO2↑ When implementing such a sulfur removal scheme, zinc remains in the mixture in oxide form and the reduction stage will be required for its sublimation, so it is necessary to introduce additional carbon-containing material in the mixture. Evaluation of the decomposition parameters of zinc sulfide (in a technogenic formation), was carried out by heating the sludge from the production of synthetic fibers located in the Balakovo city, Saratov region. The raw mixture was prepared based on the presented ratio of the components
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