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PLENARY LECTURES AND VIP GUESTS
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Pavel Kozlov

JSC CZP

Formation Of Accretions In Waelz Kilns As The Result Of Various Oxidised Feed Material Recycling
Vanyukov International Symposium
(3rd Intl. Symp. on Sustainable Non-ferrous Smelting and Processing)[]


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Abstract:

Formation of accretions is one of the main disadvantages of the processes which are carried out in Waelz kilns (productivity falls, chemistry of the process is violated). <br />Analysis of the accretions formation process reveals that the main causes of their growth are:<br />- Chemical composition of charge mixture (as it contains slag-forming compounds - CaO, SiO2, FeO);<br />- The kiln rotation speed;<br />- Feed material quantity;<br />- Temperature conditions;<br />- Grain size composition of charge mixture. <br />Setting operating conditions of the Waelz kiln in accordance with charge material composition makes it possible to avoid accretion formation. <br />At the same time, it is necessary to form skull in the kiln as a means of the furnace refractory protection from chemical and thermal "corrosion".<br />It is suggested to operate the Waelz kiln in the regime of variable silica ration in the interval from 0.4A·0.6 to 1.4A·1.6 that gives an opportunity for charge mixture consisting mainly of zinc cakes to exclude furnace shutdown for accretions removal and to increase in-service life of refractory protection at the expense of skull.

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