11th International Symposium on High Temperature Metallurgical Processing: Preparation of Alloys and Materials
Sponsored by: TMS Extraction and Processing Division, TMS: Pyrometallurgy Committee
Program Organizers: Zhiwei Peng, Central South University; Jiann-Yang Hwang, Michigan Technological University; Jerome Downey, Montana Technological University; Dean Gregurek, RHI Magnesita; Baojun Zhao, Jiangxi University of Science and Technology; Onuralp Yucel, Istanbul Technical University; Ender Keskinkilic, Atilim University; Tao Jiang, Central South University; Jesse White, Kanthal AB; Morsi Mahmoud, King Fahd University Of Petroleum And Minerals
Thursday 8:30 AM
February 27, 2020
Room: 12
Location: San Diego Convention Ctr
Session Chair: Onuralp Yücel, Istanbul Technical University; Xuewei Lv, Chongqing University
8:30 AM Introductory Comments
8:45 AM
Production of a Cobalt-Nickel-Iron Alloy from Low Grade Ore: Yotamu Hara1; Shadreck Chama1; Stephen Parirenyatwa1; Kennedy Chikontwe1; Douglas Musowoya1; Haggai Simfukwe1; Choolwe Muchindu1; Golden Kaluba1; 1Copperbelt University
A novel way of producing a cobalt–nickel–iron alloy containing 55% Co, 9% Ni and 36% Fe from an oxide ore with 1.8% copper, 0.26% cobalt, 2.8% iron and 0.08% nickel has been established. The ore is initially treated hydrometallurgically via leaching and precipitation steps to upgrade copper, cobalt, iron and nickel as a bulk sulphide concentrate. Precipitation is carefully carried out to lower down iron in the bulk sulphide concentrates. The sulphide concentrate is smelted at 1220 degrees celcius to produce blister copper and slag containing 11% Co, 1.8% Ni and 7.2% Fe. The effects of basic and acidic fluxes in promoting good metal / slag separation were studied. The slag is then smelted under reducing environment at 1400 degrees celcius to yield cobalt – nickel – iron alloy. There is broad agreement between thermodynamic prediction and experimental results. The alloy was characterised using scanning electron microscopy (SEM) technique.
9:05 AM
A New Approach for the Production of Li4SiO4 Powder: Kagan Benzesik1; Ahmet Turan2; Onuralp Yücel1; 1Istanbul Technical University; 2Yalova University
Li4SiO4 is a promising material for CO2 capture at high temperatures. A high capture capacity up to 36.7 wt% between 450–700°C, fast carbonation/decarbonation kinetics, good mechanical properties and also cyclic usage can be counted as the advantages of this solid. Li4SiO4 can be synthesized using different methods: the solid-state reaction, the precipitation method, the impregnation suspension method and the sol–gel method. However all the processes which are mentioned above, requires high energy consumption and result in the products having large grain size. Combustion synthesis techniques are energy efficient and advantageous in terms of obtaining nano-sized ceramic powders. Therefore, the main purpose of this study is producing Li4SiO4 powders with volume combustion synthesis (VCS) for new approaches in CO2 capture, instead of the conventional and commercial methods.
9:25 AM Cancelled
Effect of Intercritical Heat Treatment on Microstructure and Mechanical Properties of Sn Bearing 33MnCrB5 Steel: Lijuan Sun1; Fuming Wang1; Zhanbing Yang1; Changrong Li1; Wei Shen1; Shuai Liu1; 1University of Science and Technology Beijing
With the recycling of scrap steel, the accumulation of Sn deteriorates the properties of high strength low alloy structural steel. The effect of intercritical heat treatment (IHT) on microstructure and mechanical properties of Sn bearing 33MnCrB5 steel has been studied. Results indicated that a composite microstructure of ferrite and martensite was obtained by adding the intercritical quenching to the conventional quenching and tempering. Compared with the conventional heat-treated samples, the impact energy increased evidently from 30J to 77J and the strength decreased slightly. The loss of strength resulting from the IHT is reduced by the modification of tempering conditions. Furthermore, AES showed that the grain boundary segregation of Sn can be alleviated via the IHT. Based on different heat treatment results, the optimum heat treatment technology, that is, 910°C normalizing，860°C pre-quenching，770°C intercritical quenching，450°C tempering, was obtained to balance the strength and toughness.
9:45 AM Cancelled
Combining Discrete Element Method and Artificial Neural Network to Predict the Particle Segregation Behaviors at Bell-less Top Blast Furnace: Zhehan Liao1; Chengfeng Sun1; Yang Xu1; Muyang Wu1; Yizhang Yang1; Chao Wang1; Jian Xu1; 1Chongqing University
The particle segregation behaviors of the granular materials are inevitably occurring but typically undesirable in the industrial processes. It will directly affect heat transfer efficiency between gas and solid in the blast furnace ironmaking process. Therefore, the understanding and prediction of particle segregation behaviors help optimize the process and improve production efficiency. This work firstly employs the Discrete Element Method (DEM) to investigate the effects of particle density, mean diameter, mass of particles, particles mass ratio and angle of chute on the mass and size segregation at bell-less top blast furnace with the serial type hopper. Then the Artificial Neural Network (ANN) model is developed to predict the aforementioned behaviors in the radial direction based on the numerical data. The results show that the predicted segregation behaviors by the established ANN model is in a good agreement with the simulated results.
10:05 AM Cancelled
Preparation of Transition Metal Nitrides via Reduction-nitridation with Ammonia: Yongjie Liu1; Yu Zhang1; Zhixiong You1; Xuewei Lv1; 1Chongqing University
High-quality transition metal nitrides have been prepared by direct reduction and nitridation of transition metal oxide with ammonia as reductant and nitrogen source. The thermodynamic of reduction and nitridation process was initially analyzed. Then, the effects of the reaction temperature, reaction time and ammonia flow rate on the product quality were investigated. It was found that the reaction temperature and time had a significant effect on the reduction and nitridation process, while the ammonia flow rate had little influence. With the increase of reaction temperature and time, the oxygen content was decreased in the product. This method avoids the introduction of other impurity elements except the negligible trace elements of the raw materials. In the meantime, the final product contains a relatively high nitrogen content and a low residual oxygen content. The quality of the products has been greatly improved and fully meets the standards of industrial products.