2016-Sustainable Industrial Processing Summit
SIPS 2016 Volume 8: Non-ferrous, Rotary Kiln, Ferro-alloys, Rare Earth, Coal
| Editors: | Kongoli F, Xueyi G, Shumskiy V, Kozlov P, Capiglia C, Silva AC, Turna T |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2016 |
| Pages: | 350 pages |
| ISBN: | 978-1-987820-50-8 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Research And Development Of Hydrometallurgical Processing Stage In Copper Industry Wastes’ Recycling Technology With Tin Recovery Into Tin Concentrate
Pavel Kozlov1;1CHELYABINSK ZINC PLANT, Chelyabinsk, Russian Federation;
Type of Paper: Regular
Id Paper: 216
Topic: 40
Abstract:
Formation of skulls is one of the main disadvantages of the processes, carried out in rotary kilns (productivity decrease, process chemistry violation).
Analysis of skull formation process reveals the main causes of their growth:
-chemical composition of charge mixture (containing slag-forming compounds – CaO, SiO2, FeO);
-kiln rotation speed;
-feed material quantity;
-temperature conditions;
-grain size composition of charge mixture.
Setting operating conditions of rotary kiln in accordance with charge material composition makes possible to avoid skull formation.
At the same time, it is necessary to make the skull-formation in the kiln as a means of the furnace refractory protection from chemical and thermal “corrosion”.
It is possible to solve the problem of the furnace operation without any skulls and refractory time facing more than 12 months by rotary kiln operating in variable silica ratio mode:
- Period 1, silicate unit (C/S) – 0.4 – 0.6 (skull is not formed). Duration is 2-4 days. Skull is removed if the furnace operation is more than 4 days;
- Period 2, silicate unit (C/S) – 1.4 – 1.6 (skull is formed). Duration is 1 day. Skull can be increased if the furnace operation is more than a day.
Provision of operation mode requires the variable silicate module:
- installation of the thermal imager, controlling the furnace body temperature, which allows to estimate the skull thickness;
- repeating the furnace operation with the silicate module 1.4 – 1.6.
Keywords: Waelz process, skull, silica ratio, charge, lining, temperature gradient.
References:
[1] P. Kozlov, Mastering of recycling of anthropogenic wastes of non-ferrous metallurgy, Non-ferrous Metals, 2 (2014), 45-52.[2] A.M. Panshin, R.M. Shakirzyanov, A.V. Zatonskiy, P.A. Kozlov., D.A. Ivakin, Processing of dusts of bag collectors, formed during production of secondary copper, containing zinc, lead and tin, Proceedings of Fundamental researches and applied developments of processes of utilization and processing of anthropogenic formations, Ekaterinburg: Ural Department of Russian Academy of Science, 2014, 522.
[3] M.E. Syroeshkin, Sh.I. Yumakaev, Processing of Waelz-oxides, slag sublimates and lead dusts on lead-zinc plants, Metallurgiya, Moscow, 88 (1971)
[4] A.M. Panshin, D.A. Ivakin, V.N. Vyatkin, Thermodynamic and kinetic analysis of distillation of zinc, lead and tin in Waelz-kiln during processing of powder-like polymetallic middings of copper industry, Tsvetnye Metally=Non-ferrous metals, 8 (2013), 41-44.
[5] L.A. Kazanbaev, P.A. Kozlov, V.L. Kubasov, A.V. Kolesnikov, Hydrometallurgy of zinc (purification of solutions and electrolysis), Ore and Metals, Publishing House, 2006, 176.