Characterization of Minerals, Metals and Materials: Mineral Processing and Analysis III
Sponsored by: TMS Extraction and Processing Division, TMS: Materials Characterization Committee
Program Organizers: Jian Li, CanmetMATERIALS; Mingming Zhang, Baowu Ouyeel Co. Ltd; Bowen Li, Michigan Technological University; Sergio Monteiro, Instituto Militar de Engenharia; Shadia Ikhmayies; Yunus Kalay, Middle East Technical University; Jiann-Yang Hwang, Michigan Technological University; Juan Escobedo-Diaz, University of New South Wales; John Carpenter, Los Alamos National Laboratory; Andrew Brown, Devcom Arl Army Research Office

Wednesday 8:30 AM
February 26, 2020
Room: Theater A-5
Location: San Diego Convention Ctr

Session Chair: Jiann-Yang Hwang, Michigan Technological University; Andrew Brown, Army Research Laboratory


8:30 AM  
Effect of Acidic Attack on the Structural Characteristics of Sepiolite from Nevada, USA: Huaguang Wang1; Bowen Li1; 1Michigan Technological University
    The effects of acid attack to structure and surface properties of sepiolite from Nevada, USA were investigated by using H2SO4, HCl and HNO3 under different conditions. It was found that 0.5M HNO3 attacking sepiolite sample for 4h was the optimal condition to remove impurities of dolomite and calcite, raising the content of sepiolite from 60.7 to 93.0 wt.%. With the intensity of acid attack increasing, the structure of sepiolite was destroyed. In H2SO4 attack process, the hydrogen ions reacted with the hydroxyl groups of the sepiolite first, and then reacted with the Mg2+ cations. The formation of CaSO4 not only prevented the replacement reactions between H+ and Mg2+ ions but also promoted the water absorption of sepiolite. In HNO3 and HCl attack process, Mg2+ cations were replaced by H+ ions first for HNO3 and HCl acid treatment, and then reacted with the hydroxyl groups of the sepiolite.

8:50 AM  
Leaching of Copper, Cobalt and Nickel from Complex Ore: Yotamu Hara1; Douglas Musowoya1; Golden Kaluba1; Choolwe Muchindu1; Haggai Simfukwe1; Kennedy Kennedy1; Stephen Parirenyatwa1; Tinah Chanda1; 1Copperbelt University
    The paper focuses on leaching of complex copper – cobalt - nickel ore from Mwinilunga district in Zambia, containing 0.6% Cu, 0.21% Co, 62% Fe and 0.4% Ni. Mineralogical examination of the ore using scanning electron microscope (SEM) showed that copper, cobalt and nickel exist in fine particles of heterogenite and limonite mineral phases. The effects of leaching temperature, pH and sodium meta-bisulphate (SMBS) addition were studied. The optimal conditions were found as follows; leaching temperature of 65 - 75 degrees, leaching time of 1 hour and SMBS addition at 1.3 weight %. Copper, cobalt and nickel were recovered from the leach solution via precipitation with sodium sulphide and magnesium oxide. Sodium sulphide was more selective than magnesium oxide.

9:10 AM  Cancelled
Preparation and Photocatalytic Properties of Mo-doped TiO2@fly Ash Cenospheres for Degradation of Methylene Blue: Yongfeng Cai1; Bin Xu1; Li Guanghui1; Min Li1; Mingjun Rao1; Jun Luo1; Zhiwei Peng1; Pengxu Cao1; 1Central South University
    Mo-doped titanium dioxide (TiO2) coated fly ash cenospheres (FAC) was synthesized by the sol-gel method. The novel photocatalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS) and X-ray photoelectron spectra (XPS). The results showed that the catalyst maintains the structure of anatase (TiO2), and the majority of doped Mo ions existed as Mo6+ ions substitution in anatase lattice, which caused red shift of TiO2 light absorption wavelength, broadening the light absorption range and making more effective use of solar energy. The photocatalytic activity of Mo-TiO2@FAC sample for the degradation of methylene blue (MB) under visible light irradiation was investigated. The photocatalyst that was calcined at 550 ℃ with Mo/Ti molar ratio of 0.3% and concentration of 2g/L exhibited the optimal photodecomposition property.

9:30 AM  Cancelled
Removing Arsenic from the NiSO4 Solution Using Modified D301 Resin: Ailiang Chen1; Sun Xintao1; Jinxi Qiao1; Zhen Qian1; Yan Zhang2; Yutian Ma3; Zhiqiang Liu4; Lixue Shi1; 1Central South University; 2State Key Laboratory of Nickel and Cobalt Resources Comprehensive Utilization; 3State Key Laboratory of Nickel and Cobalt Resources Comprehensive Utilization;Jinchuan Group Co. Ltd; 4Guangdong Research Institute of Rare Metals;State Key Laboratory of Rare Metals Separation and Comprehensive Utilization
     Abstract: Arsenic is removed from the NiSO4 solution using modified D301 resin. The modification is based on the fact that WO42- react with AsO43- in the NiSO4 solution to form arsenotungstic ions. This study grafted WO42- onto the resin to remove arsenic in the NiSO4 solution and avoided the loss of tungsten. The effects of reaction time, temperature and the pH of solution on arsenic removal efficiency were investigated. When the reaction time is 4 h and the pH value of solution is 3.06, arsenic is remove using WO42- - loaded D301 in the NiSO4 solution at normal temperature. Results show that the concentration of As (V) from 50 mg/L fell to below 5 mg/L in the NiSO4 solution. There is no impurities were brought in the process of arsenic removal, achieving higher ratio of arsenic removal in the industry. Keywords: Arsenic removal; NiSO4 solution; D301; Ratio of arsenic removal

9:50 AM Break

10:10 AM  
Activated Carbon Prepared from Bituminous Coal/poplar Blends by Direct KOH Activation: Xiaohu Zhou1; Shengfu Zhang1; Yuyang Wei1; Xiong Xiao1; Weiyi Chen1; 1Chongqing University
    Columnar activated carbons (ACs) were prepared from the bituminous coal/poplar blends using KOH as an activation agent by varying the mass ratio (bituminous coal/poplar and KOH/carbon materials). The specific 2D-NLDFT surface area and total pore volume of the prepared ACs are in the range of 436–825 m2/g and of 0.193–0.360 cm3/g, respectively. The pore size distribution of ACs show that most of the pores are in the range from large micropores to small mesopore and their distribution can be controlled by the both mass ratio. And the obvious differences in surface morphology between wood and coal phase, as expected from the intrinsic property of the two materials, were observed from SEM images, the former was irregular, heterogeneous, and highly porous, while the latter shown a smooth, regular surface.

10:30 AM  Cancelled
Preparation of Thermal Insulation Materials from Ferronickel Slag with Addition of Fly Ash Cenosphere: Lei Yang1; Zhiwei Peng1; Yawen Huang2; Liancheng wang1; Leixia Zheng1; Mingjun Rao1; Guanghui Li1; Tao Jiang1; 1Central South University; 2School of Materials Science and Engineering, Southwest University of Science and Technology
    With the rapid development of the ferronickel smelting industry, the ferronickel slag has become the fourth largest industrial slag in China, in urgent need of efficient treatment. In this study, a facile route for preparing insulating materials from ferronickel slag with the addition of fly ash cenosphere was developed based on thermodynamic calculation and experimental exploration. The experimental results showed that a high-quality insulating material with thermal conductivity of 0.4752 W/(m. K), bulk density of 1.36 g/cm3, and compressive strength of 34 MPa could be obtained when the ferronickel slag was sintered with addition of 25 wt % fly ash cenosphere at 1200 °C for 2 h. The method is expected to provide a useful guide for treatment of ferronickel slag.