Rare Metal Extraction & Processing: Base and Rare Metals
Sponsored by: TMS Extraction and Processing Division, TMS: Hydrometallurgy and Electrometallurgy Committee
Program Organizers: Hojong Kim, The Pennsylvania State University; Shafiq Alam, University of Saskatchewan; Harald Oosterhof, Umicore; Neale Neelameggham, Ind LLC; Takanari Ouchi, The University of Tokyo
Tuesday 2:00 PM
February 28, 2017
Location: San Diego Convention Ctr
Session Chair: Xiaofei Guan, Harvard University; Neale Neelameggham, Ind LLC
Disclosure of the Kinetic Relations of Semidirect Cemented Carbide Leaching in Acid Media: Gregor Kücher1; Stefan Luidold1; Christoph Czettl2; Christian Storf2; 1CDL-TM; 2CERATIZIT Austria GmbH
The purpose of this investigation is to provide the basis for semidirect recycling of hard metals. Accordingly the present investigation focuses on revealing the fundamental kinetic aspects during cemented carbide leaching in hydrochloric acid with an oxidant. In order to receive significant data out of the experiments the set-up is crucial. Hence an appropriate preliminary sample preparation combined with an adequate arrangement in the reaction vessel is employed. Moreover a systematical design of experiments is implemented to allow a statistical evaluation and regression analysis of the obtained results. During the experiments the influence of several parameters like the temperature, the acid- as well as the oxidant concentration on the leaching behavior is examined. Finally an empirical kinetic law is proposed to describe the lixiviation performance of cobalt out of the hard metal substrate.
2:25 PM Student
A New Two-stage Process for Preparation of Ti/Ti-Al Alloys: Kun Zhao1; Naixiang Feng1; 1Northeastern University
This work presents a two-stage aluminothermic reduction process for preparing Ti and Ti-Al alloys using Na2TiF6. Al-Ti master alloy and pure cryolite as co-products could be obtained. After the first stage reduction, O content of the metal production (particle size of less than 74 μm) was below about 0.35 wt.%. Ti (Ⅳ), Ti (Ⅲ) and Ti (0) were existed in the Ti-containing cryolite, and the content was about 3 wt.%~10 wt.%. After secondary reduction, Ti content of the cleanly cryolite was reduced to 0.002 wt.%. The Al-Ti master alloy obtained by secondary reduction was composed of Al and TiAl3. A cyclical production process is founded by Al-Ti master alloy returned to the next first and secondary reduction process as reductant, in which Ti and Al are almost 100 per cent recyclable.
2:50 PM Student
Study on Pre-reduction Mechanisms of Chromium Ore Pellets in SRC Process: Peixiao Liu1; Yanxiang Li1; Hanjie Guo1; 1University of Science and Technology Beijing
The thermodynamic analysis on chromium ore pellets in solid reduction chromium process is carried out, the result of which is validated by pre-reduction experiment of cold briquetted chromium ore. Polarization Microscope and SEM are employed to observe microstructure and element composition. The thermodynamic analyses indicate that the Cr2O3 will be reduced to metallic chrome in solid reaction with the ratio of CO and CO2 pressure reaching 2017 at 1200℃. The experimental results agree well with the thermodynamic analyses.
3:15 PM Break
3:35 PM Student
Sulfuric Acid Leaching of Mechanically Activated Vanadium-bearing Converter Slag: Junyi Xiang1; Qingyun Huang2; Xuewei Lv1; Chenguang Bai1; 1School of Materials Science and Engineering, Chongqing University; 2School of Materials and Metallurgical Engineering, Chongqing University of Science and Technology
The extraction of vanadium from mechanically activated converter slag was studied in dilute sulfuric acid solution. The effects of calcification roasting and leaching parameters were investigated. The results show that Ca/V mole ratio, roasting temperature, leaching temperature, S/L ratio and leaching time significantly affected the dissolution of vanadium while only roasting time has relatively minor effects under the conditions in this work. The over-high roasting temperatures and Ca/V mole ratios performed negative effects on the dissolution of vanadium. The optimum conditions for roasting was found to be 800 ℃, 60 minutes and 1:1 Ca/V mole ratio, and that for leaching conditions was pH 2.5, 60 ℃, 20:1 L/S ratio, -150 mesh and 40-80 minutes. More than 90% of vanadium was leached from the converter slag under these optimum conditions.
Present Status and Development of Comprehensive Utilization of Vanadium-Titanium Magnetite: Shiju Zhang1; Shiju Zhang2; Songli Liu2; Wenhui Ma1; Kuisong Zhu2; Li Cao3; Yongnian Dai1; 1Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology; 2Resources and Environmental Engineering College of Panzhihua University; 3Materials Science and Engineering College , Xihua University
There is an abundance of vanadium-titanium magnetite in Panzhihua, China，which contain more than 8. 73×108 tons of TiO2 accounting for 90.6% of the national reserves. To fully utilize Panzhihua titanium resources, many processes were proposed. The development and utilization of vanadium-titanium magnetite resource have extremely vital significance. However，its current use of technology is inadequate. This article is a review on techniques to make comprehensive use of vanadium titanium magnetite，especially in the titanium extraction, and the existing problems are also introduced. The authors predict its possible tendency of development in the future.
Review of TiO2-rich Materials Preparation for the Chlorination Process: Songli Liu1; Songli Liu2; Li Cao2; Li Cao1; Kuisong Zhu1; Shiju Zhang3; Shiju Zhang1; Pan Huang2; Pan Huang1; 1Resources and Environmental Engineering College , Panzhihua University; 2Materials Science and Engineering College , Xihua University; 3Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology
The domestic and overseas technologies for producing rich titanium materials were discussed, and the advantages and disadvantages of these methods were expatiated in this paper.In light of the development of Panzhihua titanium materials , this paper proposes that carbonthermal reduction-nitridation method is considered to be more suitable method for preparing chlorinated rich titanium material.