PbZn 2020: The 9th International Symposium on Lead and Zinc Processing: PbZn Process Fundamentals I
Sponsored by: The Mining and Materails Processing Institute of Japan, Nonferrous Metals Society of China, GDMB: The Society for Mining, Metallurgy Resourcce and Environmental Technology, Metallurgy & Materials Society of the Canadian Institute of Mining, Metallurgy & Petroleum, TMS Extraction and Processing Division, TMS: Hydrometallurgy and Electrometallurgy Committee, TMS: Process Technology and Modeling Committee, TMS: Pyrometallurgy Committee, TMS: Recycling and Environmental Technologies Committee
Program Organizers: Andreas Siegmund, LanMetCon LLC; Shafiq Alam, University of Saskatchewan; Joseph Grogan, Gopher Resource; Ulrich Kerney, Recylex; Cheng Liu, China Enfi Engineering Corporation; Etsuro Shibata, Tohoku University
Monday 10:45 AM
February 24, 2020
Room: 14B
Location: San Diego Convention Ctr
Session Chair: Shafiq Alam, University of Saskatchewan
10:45 AM
Refractory Challenges in Lead and Zinc Furnaces: Dean Gregurek1; Katja Reinharter1; Jürgen Schmidl1; Alfred Spanring1; 1RHI Magnesita
Refractory linings in primary, secondary lead and zinc furnaces like QSL reactor, KIVCET furnace, Top Submerged Lance Technology (Outotec Ausmelt/IsasmelterTM), TBRC/Kaldo furnaces, SKS – Technology, Side Blowing Furnaces, reverberatory and short rotary furnaces, New Jersey Process, as well as, WAELZ kiln are exposed to several stresses rather complex in their interaction. In the present work the main wear parameters, such as corrosion by slag, high sulfur, soda and iron oxide supply as well as reduction, metal/sulfide infiltration and hydration, are briefly introduced and discussed. The extraordinarily high SiO2 supply results in “forsterite bursting” combined with volume expansion. Increased operation temperatures in the furnace support microstructural brick degeneration. All mentioned wear phenomena develop to a severe degradation of brick microstructure and consequently to decreased lining performance. The obtained information and insights serve as a basis for improving refractory materials to provide the best solutions for RHI Magnesita’s customers.
11:05 AM
Slag Reduction Kinetics of a Lead Slag from a Secondary Lead Smelter: Stuart Nicol1; Joseph Grogan1; Boyd Davis2; Trevor Lebel2; 1Gopher Resource; 2Kingston Process Metallurgy
In the classical pyrometallurgy route for lead smelting, the smelter produces a slag containing measurable quantities of lead. The lead in the slag is most often discharged from the smelter, leading to the disposal of significant quantities of lead. The slag needs to be safely stored to prevent the release of lead into the environment.In this work, the recovery of lead, and other deleterious elements, from a lead smelter slag has been investigated experimentally. Thermodynamic simulation was performed to determine the viability of a methane reduction process. Based on the thermodynamic simulation and knowledge of the phases and distribution of elements between the phases in the smelter slag, methane reduction was tested on a bench scale. A comparison between the thermodynamic predictions and observations provides an insight into the processes occurring during reduction and the kinetic limitations of this process.
11:25 AM
Numerical Simulation of Gas-liquid Flow Mixing Effect in Bottom-blown Bath: Dongbo Li1; Peng Li1; Xin Yao1; Cheng Liu1; Zeshang Dong1; 1China ENFI Engineering Corporation
In order to clarify the stirring mechanism of bottom-blown bath, VOF multiphase flow model was used to simulate the gas-liquid two-phase flow process, and the simulation results were verified by water model test, and the influence of gas-liquid mixed melt process was analyzed. The results show that the separation effect of slag gold is better when the injection angle is between 15°~22.5°. When the gas velocity is 70 m/s, the gas stirring radius is 1 m, so the distance between the oxygen lance and the furnace wall is 1~1.5 m, which can ensure that the furnace wall is not washed by excessive melt.The optimum spacing of oxygen lance is controlled at 2~3m, the distribution of oxygen lance is more reasonable, the effect of pool agitation is better, and the splash caused by excessive pool agitation is prevented.