PbZn 2020: The 9th International Symposium on Lead and Zinc Processing: Environmental & Safety Practices
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
Wednesday 11:00 AM
February 26, 2020
Room: 15B
Location: San Diego Convention Ctr
Session Chair: Christina Meskers, SINTEF
11:00 AM
ILTEC Technology – New Pathways Towards Safe and Effective Cooling: Andreas Filzwieser1; Martina Hanel2; Hans-Jörg Krassnig3; Rolf Degel4; Tim Lux5; Alexander Bergs5; 1Mettop GmbH/PolyMet Solutions GmbH; 2Mettop GmbH; 3PolyMet Solutions GmbH; 4SMS Group GmbH/PolyMet Solutions GmbH; 5SMS Group GmbH
It is the increasing demand for an economic and cost saving operation mode that requires effective cooling in order to achieve low refractory wear and good furnace lifetime, which is making cooling technology a sustainable aspect of furnace operation. In addition, safety awareness is becoming more and more a focal point of the operating philosophy. However, the use of water - today’s standard cooling medium - has major drawbacks as it can cause problems during furnace start up and operation, namely hydration problems, corrosion and explosion. Not to forget the severe personal as well as economic damage in case of a malfunctioning water cooling systems. ILTEC is a new patented cooling technology, developed by Mettop GmbH in Austria, to overcome the disadvantages of water by using an alternative cooling medium, namely the ionic liquid IL-B2001. IL-B2001 is non-flammable, non-corrosive, non-toxic and minimizes explosions due its low vapor pressure. It also has a wide liquidus range and operating temperatures between -15 and 200 °C. These properties all contribute to the safe use of IL-B2001 in various cooling applications in the non-ferrous metal processing as well as iron and steel industry wherever there is a risk of cooling water explosions. This paper will emphasize potential applications for the lead and zinc industry as well as general non-ferrous metals industry. It will highlight safety related items, the use of the ILITEC Technology for energy recovery and new process routes that are made possible.
11:20 AM
CORETM – Advances in Sulfuric Acid Technology: Herbert Lee1; Claudia Araya1; 1Chemetics Inc.
11:40 AM
Review of Waste Water Treatment Technologies Used in Lead Recycling: James Dahlstrom1; Joseph Grogan1; Benjamin Rodrigue1; 1Gopher Resource
Lead is one of the most highly recycled and regulated metals. Environmental controls around the processing of lead are extremely important to the continued success of lead as a means of energy storage in the circular economy. This paper describes the different chemistries and technologies used to control waste water emissions from secondary lead facilities. Commonly used technologies include iron co-precipitation, sulfide precipitation and gypsum precipitation. Alternative technologies with future potential are also discussed.
12:00 PM
Optimization of Arsenic Removal Process in Waste Acid from Zinc Smelting Plant Based on Orthogonal Experiment: Tianqi Liao1; Yongguang Luo2; Hongtao Qu2; Te Zhang2; Jing Li1; Yunhao Xi1; Jingtian Zou3; Libo Zhang1; Kaihui Cui1; 1Kunming University of Science and Technology/National Local Joint Laboratory of Engineering Application of Microwave Energy and Equipment Technology/Key Laboratory of Unconventional Metallurgy, Ministry of Education; 2Kunming University of Science and Technology/Yunnan Chihong Zn&Ge Co., Ltd; 3Kunming University of Science and Technology;National Local Joint Laboratory of Engineering Application of Microwave Energy and Equipment Technology;Key Laboratory of Unconventional Metallurgy; Ministry of Education
In this paper, a method is determined, removing arsenic from waste acid by adding Fe and CuSO4. Through orthogonal experiment, further analyzing the effect of different factors on the removal rate of arsenic in this method. L16(44) orthogonal experiments were employed to optimize the process parameters such as temperature, the reaction time, pH, the molar ratio of Fe/As. Based on the results of the orthogonal experiment, the optimum experimental condition were that: pH was 8, temperature was 80 ℃, the reaction time was 30 minutes and the molar ratio of Fe/As was 8. Through range analysis, it was found that the order of significant factors for the removal rate of arsenic in waste acid is the reaction time > pH > temperature > the molar ratio of Fe/As. The optimized technological parameter was selected for verification experiment. Forming iron oxides and hydroxides via Fe powder corroded, which adopt adsorption coprecipitation mechanism to remove arsenic from waste acid. Besides that, the most important point is that Cu-Fe micro battery is formed by adding CuSO4 to accelerate the corrosion of Fe powder, which could indirectly increase the efficiency of arsenic removal. From the above, the Cu-Fe micro battery and the adsorption process are very important to arsenic removal, which have close connection with the reaction time and pH. It is consistent with range analysis of orthogonal experiment.