2019-Sustainable Industrial Processing Summit
SIPS2019 Volume 4: Kozlov Intl. Symp. / Sustainable Materials Recycling Processes and Products
| Editors: | F. Kongoli, S.V. Alexandrovich, D.V. Grigorievich, L.L. Igoryevich, I. Startsev, T.A. Vladimirovich |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2019 |
| Pages: | 193 pages |
| ISBN: | 978-1-989820-03-2 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Mastering of Technology of Waelz-Oxide Calcination in Rotary Furnace
A. Panshin1; Sergey Yakornov2; Pavel Kozlov3;1LLC "UMMC-HOLDING", Verkhnyaya Pyshma, Russian Federation; 2LLC "UMMC-HOLDING", Verkhnya Pyshma, Russian Federation; 3UMMC-HOLDING, Moscow, Russian Federation;
Type of Paper: Regular
Id Paper: 139
Topic: 7
Abstract:
This article gives the results of the mastering of the technology of Waelz oxide calcinations in rotary furnaces in the Chelyabinsk Zinc plant. A flow hardware diagram is shown together with calcinations process modes.
Waelz oxide calcinations technology includes the following measures: pelletizing of powdered oxide into pellets, calcinations in pipe furnaces, pellet cooling, milling of calcined oxide in ball-rod mill, gas cooling, and cleaning with secondary fumes' recovering. Calcined products are prepared to be leached, while secondary fumes are washed with sodium carbonate and water from chlorine and fluorine.
Calcination is carried out in oxidizing the atmosphere at the temperature of 900-1100C for efficient removal of halides and oxidation of iron (II), arsenic, and metal sulfides. Residence time of the material in high temperature zones is not less than 2 -3 hours.
The calcinations technology, mastered in the Chelyabinsk Zinc plant, allows the carrying out the following measures:
- Removal of Waelz oxide halides (up to a residual content of Cl-0.06% and F-0.01%);
- Oxidation of Fe (II) and As, reduced their passing into solution during Waelz oxide leaching;
- Increase of solubility of zinc (up to 91%) and cadmium (80%) in Waelz oxide, simplifying its leaching technology and reducing metal loss;
- Reduction of material amount approximately by 2 times, increasing the leaching flowsheet productivity.
As a result of the calcinations technology, the shop processing Waelz oxide efficiency was increased by 33-36%. The wash water volume is 15-20 times lower during secondary fumes washing than during Waelz oxide washing, and the obtained solution is suitable for concentration and evaporation.
Keywords:
Concentrating; Leaching; Smelting; Technology; Zinc;References:
[1] Lakernik M.M., PakhomovaG.N., Metallurgy of Zinc and Cadmium, Moscow: Metallurgiya, 1969. 314 p.[2] Kozlov P.A., Waelz-process, Moscow: "Ore and Metals" Publishing House, 2002. 176 p.
[3] Iordanov I.T., Popov M.Z., Karoleva V.D., Yanchen Ya. Kh.Opyt, Experience of processing of Waelz-oxides at non-ferrous metals'combine in Plovdiv (Republic of Bulgaria). Non-ferrous Metals. 1963. No. 1. pp. 23-30
[4] Panshin A.M., Kozlov P.A., Zatonskiy A.V., Gizatulin O.V., Ivakin D.A., Creation of technology of Waelz-oxide calcination using large pipe furnace. Non-ferrous Metals. 2010. No. 5. pp. 17-20.