2020 Technical Division Student Poster Contest: EPD 2020 Technical Division Graduate Student Poster Contest
Sponsored by: TMS Extraction and Processing Division, TMS Functional Materials Division, TMS Light Metals Division, TMS Materials Processing and Manufacturing Division, TMS Structural Materials Division
Program Organizers: TMS Administration
Monday 5:30 PM
February 24, 2020
Room: Sails Pavilion
Location: San Diego Convention Ctr
SPG-1: An X-ray Spectromicroscopy Study of the Calcium Mineralization in the JEB Tailings Management Facility at McClean Lake, Saskatchewan: Arthur Situm1; Jeremiah Beam1; Kebbi Hughes2; John Rowson2; Joseph Essilfie-Dughan2; Andrew Crawford1; Andrew Grosvenor1; 1University of Saskatchewan; 2Orano Canada
Solid mine/mill waste (i.e., tailings) often contain chemical species of interest that cannot be easily identified. One methodology previously used in the study of the McClean Lake uranium mill tailings was the combination of X-ray fluorescence (XRF) mapping and Ca K-edge micro X-ray absorption near edge spectroscopy (μ-XANES). This work expands this methodology: Firstly, through a fitting procedure that allows a larger library of XANES spectra collected from Ca-containing minerals to be applied to each μ-XANES spectrum collected from the tailings. Secondly, by analysis of tailing porewater analyte concentrations to rationalize the presence of trace chemical species of interest. Finally, the comparison of the elemental distribution in the tailings determined by XRF mapping to the fitting results of the μ-XANES spectra has been used to help validate the results of the fittings of the μ-XANES spectra.
Cancelled
SPG-2: Arsenic Removal from Arsenic-containing Copper and Cobalt Slag Using Alkaline Leaching Technology and MgNH4AsO4 Precipitation: Xingfei Zhang1; Jia Tian1; Haisheng Han1; Wei Sun1; Yuehua Hu1; 1Central South University
In this study, a novel alkaline cycle leaching and MgNH4AsO4 precipitation technology was used to remove arsenic in arsenic–containing copper and cobalt slag. By adopting NaOH-H2O2 leaching method, the arsenic leaching reached as high as 94.5 % under the optimum conditions: NaOH concentration, 2mol/L; leaching temperature, 25℃; H2O2 concentration, 5%; and liquid-solid ratio (L/S), 9:1. Thermodynamic analysis showed that it was feasible to selectively precipitate arsenate in alkaline leaching solution in the form of MgNH4AsO4. The XRD results confirmed that the arsenic mainly existed in the form of MgNH4AsO4•6H2O, which has good crystallinity, contributing to a better arsenic and alkali separation. Under the optimum conditions, the content of arsenic in the purified liquid and purified residue were 32 mg/L and 23.43 %, respectively. Thus, the purified alkaline solution could be circulated for the leaching process, which is beneficial to the cost reduction and environment protection.
SPG-3: Composition and Abrasiveness of Biomass Extrinsic and Intrinsic Inorganic Compounds: Kyungjun Lee1; Sougata Roy1; Ercan Cakmak1; Jeffrey Lacey1; Thomas Watkins1; Harry Meyer III1; Vicki Thompson1; James Keiser1; Jun Qu1; 1Oak Ridge National Laboratory
Inorganic compounds inside or attached onto biomass feedstocks significantly affect the tool life in size reduction and pre-conversion processes. The conventional combustion-based ash extraction inevitably alters the inorganic compounds due to oxidation and thermal decomposition. Composition-preserving methods are presented here for extracting and analyzing both the extrinsic and intrinsic inorganic compounds. Comprehensive characterization has been conducted on different types of biomass. The extrinsic inorganic compounds are dominated by quartz along with other minor minerals, and the particle sizes are of a few hundreds of micrometers. Among the pine anatomical fractions, needle contains the highest intrinsic silicon content while bark trapped the most extrinsic minerals. By correlating to the wear, both the extrinsic and intrinsic inorganic compounds are believed to play important roles in the wear process. Results here validate a new approach to characterize the biomass inorganic compounds and provide fundamental insights for their impact on the preprocessing tool wear.
SPG-4: Microwave Drying of a Nickel Laterite Ore: Wei Lv1; Xuewei Lv2; Yindong Yang3; Alexander McLean3; Mansoor Barati3; 1Chongqing University; University of Toronto; 2Chongqing University; 3University of Toronto
The microwave drying of a nickel laterite was investigated to assess its potential as an alternative for drying of laterite ores prior to further pyrometallurgical processing. The water content of the raw ore used in this study (35.11%) is present as both free water (28.35%) and hydroxylated minerals (6.76%); the principle water-bearing minerals are goethite FeO·OH and lizardite Mg3Si2O5(OH)4. The effect of sample thickness and power on the specific energy consumption and effective diffusivity were assessed. The effective diffusivity increases with increasing thickness of the nickel laterite and with increasing power. The removal of crystalline water is much more energy intensive than the removal of free water. The inferred temperatures of the sample during the drying process are obtained by combining with the TG-DSC data and the mass loss curves during the microwave drying process. The energy consumption of drying nickel laterite by microwaves and a rotary kiln is compared.
SPG-5: Review of Coating Removal Techniques from Metal Substrates: Akanksha Gupta1; Brajendra Mishra1; 1Worcester Polytechnic Institute
In recent years, protection against corrosion, high temperature, and other extreme environmental service conditions is provided by applying different coatings to metal substrates. These materials mainly find applications in aerospace, automobile and commercial industries. Coatings mainly differ depending on the type of application, substrate, deposition technique, and properties desired. It is necessary to remove these coatings during inspection, refurbishment of damaged coating, and remanufacturing of end-of-life materials. Some removal techniques commonly applied are chemical stripping, high-pressure water jet technique, and impacting abrasive media. While selecting a suitable removal technique, it is essential to consider environmental, economic, and safety hazards. This review gives an in-depth review into the existing coating removal techniques and the various factors that must be considered while choosing a removal technique, and provides case studies of currently in-use coated materials.