PbZn 2020: The 9th International Symposium on Lead and Zinc Processing: Secondary Zinc 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: 15A
Location: San Diego Convention Ctr
Session Chair: Isabel Vermeulen, Umicore
10:45 AM
A New Era in Smelting Sustainability - Intensification of the OutotecŪ Ausmelt Top Submerged Lance (TSL) Process for Zinc Production: Jacob Wood1; David Wilson1; Stephen Hughes1; 1Outotec Pty Ltd
For almost 25 years, the OutotecŪ Ausmelt Top Submerged Lance (TSL) Process has been applied for the processing of zinc-bearing leach residues, slags, EAF dust and sulphide concentrates. Continual development and evolution of the technology over this period has resulted in a more intense smelting process with higher energy efficiency, lower operating costs and reduced fossil fuel consumption. This paper covers a number of recent technology advances, highlighting their positive impacts on smelter operating costs, CO2 emissions and metal recoveries for treatment of a range of zinc-bearing feed inputs. It also compares the Ausmelt TSL technology against alternatives such as the Waelz kiln, Box Fumer and Chinese Side-Blowing (Chifeng) process, demonstrating a range of advantages and operational flexibility inherent to the Ausmelt process.
11:05 AM
Production of SHG Zinc from 100% Recycled Materials: John Pusateri1; Brandon Tirpak1; J. R. de Wet1; 1American Zinc Recycling Corp.
American Zinc Recycling Corp. operates five recycling plants with a capacity of over 650,000 tons per year for EAF dusts and zinc-containing residues and secondaries. AZR operates nine Waelz kilns at four plants: Chicago, IL, Rockwood, TN, Palmerton, PA and Barnwell, SC, and recovers zinc through its INMETCO plant (RHF/SAF) near Pittsburgh. Continuous improvements to the Waelzing process have increased productivity, decreased operating costs, enhanced Waelz Oxide quality and minimized environmental impacts: temperature monitoring, air blast/oxygen-enrichment, feed conditioning and refractory systems. AZR are reintroducing its Advanced Zinc Recovery (aka Flame Reactor) oxy-fuel flash-smelting technology to provide EAF steel producers with on-site dust processing that eliminates the liability and costs associated with EAF dust transportation.Restart of the Mooresboro, NC plant, utilizing Leach/SX/EW technology, will enable AZR to produce SHG zinc from Waelz Oxide, plus other zinc secondaries, at the rate of 155,000 tons/year. Restart is scheduled for April 2020.
11:25 AM
Recent Development of EAF Dust Treating at Shisaka Smelting Co., Ltd: Satoru Takaya1; Naoki Kubota1; Hiroshi Watanabe1; Takao Kudo1; 1Shisaka Smelting Co., LTD.
Shisaka Smelting Co., Ltd. has recovered crude zinc oxide from electric arc furnace dust (EAF dust) by the Waelz kiln process since 1977. When the operation started, malfunctions frequently occurred in the granulation process which was previous process of a reduction roasting process. We stopped this process and shifted to the process directly charging EAF dust in the reduction rotary kiln. As a result, we had been weak in treating high zinc EAF dust for a long time.To improve the disadvantage, we have introduced the new granulation process which is off-line since 2011. Thereby, zinc recovery rate in the reduction rotary kiln greatly increases and the capacity treating high zinc EAF dust reaches 50,000 tons per year.