11th International Symposium on High Temperature Metallurgical Processing: Extraction and Recovery of Metals
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
Wednesday 8:30 AM
February 26, 2020
Room: 12
Location: San Diego Convention Ctr
Session Chair: Zhiwei Peng, Central South University; Morsi Mahmoud, King Fahd University Of Petroleum and Mineral
8:30 AM Introductory Comments
8:45 AM
A Study on Recovery of Iron from Red Mud by Solid State Reduction Followed by Magnetic Separation: Said Eray1; Ender Keskinkılıç2; Mustafa Varol1; Yavuz Topkaya3; Ahmet Geveci3; 1Ağrı İbrahim Çeçen University; 2Atilim University; 3Middle East Technical University
Red mud is a waste material of the Bayer process for alumina production from bauxite ore. Red mud is generally pumped to disposal in an artificial pond which is accompanied by great land occupation and environmental issues. Many researches in different fields have been carried out to evaluate the red mud. Of these, researches on recovering valuable metals from red mud are the most successful. In this study, recovery of iron, which is the most abundant metal in red mud, was investigated. A red mud sample with 34% Fe2O3 was used. Solid state carbothermic reduction followed by wet magnetic separation was performed to recover iron. Reduction was carried out at temperatures 1000-1200 ℃. Reduced samples were ground and subjected to wet magnetic separation. The effect of reduction temperature and grinding time were investigated on the metallization of iron and the iron content of the final concentrate.
9:05 AM
Solid-state Reduction Studies for Recovery of Iron from Red Mud: Ender Keskinkilic1; Saeid Pournaderi2; Ahmet Geveci3; Yavuz A. Topkaya3; 1Atilim University; 2Agri Ibrahim Cecen University; 3Middle East Technical University
Red mud or bauxite residue can be regarded as a by-product of aluminum extraction process since it contains a significant amount of iron and some valuable elements. Therefore, the treatment of red mud has been a hot topic for some decades. Last year, the authors started a laboratory-scale project dealing with stepwise recovery of valuable elements from red mud of Seydisehir Aluminum Plant, Turkey. The first step is related to recovery of iron and pyrometallurgical methods (solid-state reduction and smelting) are currently being performed. Nonferrous metals will then be selectively leached in the second step. In TMS 2019, the authors outlined the literature related to the smelting studies for iron recovery from bauxite residue. In the extent of the present work, a literature review relevant to the solid-state reduction studies for recovery of iron from red mud was presented.
9:25 AM Cancelled
Recovery of Chromium from Ferronickel Slag via Alkaline Roasting Followed by Water Leaching: Effect of Roasting Atmosphere: Foquan Gu1; Yuanbo Zhang1; Zhiwei Peng1; Huimin Tang1; Manman Lu1; Shuo Liu1; Zijian Su1; Mingjun Rao1; Guanghui Li1; Tao Jiang1; 1Central South University
Along with the rapid development of the rotary kiln-electric furnace (RKEF) process for production of Ni-Fe alloy from laterite nickel ore during the past decade, a significant quantity of ferronickel slag was produced, with a very low utilization ratio. Because it contains a relatively high amount of chromium, which poses a great potential threat to environment, its efficient treatment for recovering chromium attracts much attention. In this study, recovery of chromium from ferronickel slag via alkaline roasting followed by water leaching was investigated, with an emphasis on the effect of roasting atmosphere on the phase transformation of ferronickel slag during the alkaline roasting process.
9:45 AM Cancelled
Effect of P2O5 on the Recovery of Ti from Ti-bearing Blast Furnace Slag by Super-gravity: Yu Du1; Jintao Gao1; Xi Lan1; Zhancheng Guo1; 1University of Science and Technology Beijing
For the efficient recovery of Ti from Ti-bearing blast furnace slag, an innovative method was proposed in this paper through investigating the effect of P2O5 on the recovery of Ti by super-gravity. Firstly, the precipitation behaviors of rutile in Ti-bearing blast furnace slag with different P2O5 content were investigated. The mineral compositions and microstructure of rutile precipitated from various slags with different P2O5 content were analyzed through XRD and SEM-EDS methods, which presented that the P2O5 in slag could effectively enrich Ti element through promoting the nucleation and growth of rutile. As the P2O5 content in slag increased from 0 wt% to 3 wt%, the volume fractions and equivalent diameters of rutile increased from 2.64 % to 25.25 % and 19.75 μm to 61.9 μm respectively. Subsequently, the separation of rutile from the slag was conducted in a super-gravity field. After super-gravity separation with G=800 at 1310 ℃ for 5min, the slag melt went through the filter and entire high-purity rutile was intercepted by the filter and effectively recovered from Ti-bearing blast furnace slag.
10:05 AM Break
10:20 AM Cancelled
Self-reduction of Core-shell EAF Dust-biochar Composite Pellets under Microwave Irradiation: Liancheng Wang1; Zhiwei Peng1; Lei Yang1; Leixia Zheng1; Jie Wang1; Wenxing Shang1; Anton Anzulevich2; Mingjun Rao1; Guanghui Li1; Tao Jiang1; 1Central South University; 2Chelyabinsk State University
Electric arc furnace (EAF) dust is an important secondary resource which the valuable elements can be recovered. The recover process can be intensified by the self-reduction of core-shell EAF dust-biochar composite pellets under microwave irradiation. In this study, the effects of various parameters on reduction of the core-shell EAF dust-biochar composite pellets in N2 were explored. It was demonstrated that under the optimal conditions of reduction temperature of 1050 °C, time of 20 min, total C/Fe mass ratio of 0.24, C/Fe mass ratio of pellet core of 0.30 and diameter of pellet core of 6-8 mm, the resulting metallized pellets had iron content of 70.13 wt.%, iron metallization degree of 97.97%, volatilization percentage of zinc of 99.52%, volatilization percentage of lead of 98.49%, manganese content of 2.83 wt.% and chromium content of 0.22wt.%. The great reduction performance was attributed to strong gasification of carbon in association with selective distribution of biochar in the composite pellets with good microwave absorption.
10:40 AM Cancelled
Study of Properties and Mineralization of Cu-Ni Bearing Industry Sludge: Mudan Liu1; Yong Liu1; Zhiqiang Chen1; Haozi Lv1; Bo Li1; 1Guangdong Institute of Resource Comprehensive Utilization; State Key Laboratory of Separation and Comprehensive Utilization of Rare Metals; Key Laboratory for Mineral Resources R&D and Comprehensive Utilization of Guangdong
A new mineralization-floatation process for enrichment of a low grade Cu-Ni-bearing industry sludge (2.61% Cu and 2.28% Ni) was proposed based on a detailed characterization of properties of the sludge. It was shown that a concentrate with Cu and Ni contents of 7.14% and 6.45%, respectively, could be obtained after locked cycle flotation with one-stage roughing, two-stage scavenging, and two-stage cleaning of the sintered sludge which was obtained by sintering the waste with additions of 15% bituminous coal, 20% sodium sulfate, 20% quartz and 2% borax at 1150 °C for 60 min. For flotation, the optimum fineness of the sintered product was 64.00% particles passing 0.045 mm sieve, and the suitable flotation collector was butyl xanthate whose dosage was 400+200+200g/t. The recoveries of copper and nickel in concentrate were 88.33% and 89.66%, respectively, and the Cu and Ni grades in the floatation tailing were reduced to 0.52% and 0.41%, respectively.
11:00 AM
Effect of Additives on Semi-molten State Reduction for Titanium Slag Production from Ilmenite Concentrate: Wei Lv1; Shiyuan Liu1; Junyi Xiang1; Xuewei Lv1; Yindong Yang2; 1Chongqing University; 2University of Toronto
In this study, a novel process is proposed to produce titanium slag from Panzhihua ilmenite concentrate. The carbothermic reduction of ilmenite concentrate, followed by wet magnetic separation, was performed to generate metallic iron and a titanium-rich slag in the presence of sodium sulfate and sodium carbonate. This work investigated the influence of reaction time, sodium sulfate additive, and sodium carbonate additive on the metallization, the TiO2 grade in the non-magnetic fractions, and recovery of titanium dioxide. The results show that sodium carbonate increases the metallization, while sodium sulfate decreases the metallization of the reduced sample. In the presence of sodium carbonate, the highest metallization and recovery of titanium dioxide can reach up to 90.57% and 0.83, respectively. In addition, the mechanism of additives influence on the reduction process is also discussed.
11:20 AM Cancelled
Separation of Vanadium from Iron in Vanadium-rich molten Iron: Guangfen Liang1; Xiangyong Lv1; Yandong Li2; Huamei Duan1; Dengfu Chen1; Mujun Long1; Song xu3; 1College of Materials Science and Engineering; 2College of Materials Science and Engineering, Yangtze Normal University; 3Bekaert (Asia) R&D Center
A large number of vanadium extraction via sodium roasting experiments have been carried out in the laboratory through the self-designed converter vanadium extraction device. The content of main elements was analyzed by X-ray fluorescence spectrometer. The optimal conditions of roasting process of vanadium slag were obtained as follows: addition of 19% Na2CO3 , roasting temperature 800℃, roasting time 120 min, and the particle size of vanadium slag was less than 125um. While the leaching process was conduted by water and the optimal conditions were obtained as fellows: the leaching temperature of 90℃, leaching time of 30min, and the liquid-solid ratio of 8.0mL/g. Under those optimal conditions, the leaching efficiency of vanadium was greater than 89.4%. And the enlarged experiments confirmed the stability of those parameters.