Technological experiments on the processing of dross with the production of commercial products
Keywords:dross, the metal fraction, the oxidized fraction, melting, burning, zinc, zinc oxide, impurities, balance experiments
The increase in the production of hot-dip galvanizing products is accompanied not only by an increase in the yield of dross, but also by its accumulation, due to the lack of rational processing technology. In this paper, the results of balance experiments on the processing of metal and oxidized fractions previously isolated from dross are presented. The effect of the consumption of such chlorinating reagents as CaCl2 and NH4Cl is studied in this work. The obtained results fully confirmed the previously obtained data established in the conditions of laboratory studies. It is shown that the melting of the metal fraction of dross at T = 450°C for 60 minutes with the addition of 2% NH4Cl from the weight of the initial sample ensures the production of a pure zinc ingot that practically does not contain impurity metals. Under the conditions of burning the oxidized component with the addition of 6% CaCl2 from the weight of the initial sample, the maximum removal of lead from the cinder was achieved from 0.35 to 0.002%. At the same time, it is not possible to achieve a decrease in the iron content in the stub. Its final content in the cinder is 0.25%. Under the conditions of burning the oxidized component of dross together with NH4Cl, at its optimal consumption equal to 15% of the weight of the initial sample, high-quality zinc oxide was obtained, suitable for its use as a mineral additive in animal and bird feed. Extraction of metals-impurities in the sublimates the conditions of burning at T = 1000°C and the duration 60 min, was, %: Cu, Ni, Fe -75%; Pb, Cd - 98%.
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