March-April 2016

CIM Journal & CIM Metallurgical Quarterly

Excerpts taken from abstracts in CIM Journal, Vol. 7, No. 1.
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Processing Nigerian pyrolusite ore, Part I: Characterization and dissolution kinetics analysis

A. A. Baba and L. Ibrahim, Department of Industrial Chemistry, University of Ilorin, Ilorin, Nigeria; R. B. Bale, Department of Geology and Mineral Sciences, University of Ilorin, Ilorin, Nigeria; A. G. F. Alabi, Department of Materials and Metallurgical Engineering, University of Ilorin, Ilorin, Nigeria (currently Department of Material Science and Engineering, Kwara State University, Malete, Nigeria); F. A. Adekola, Department of Industrial Chemistry, University of Ilorin, Ilorin, Nigeria; and M. K. Ghosh, K. Sanjay, and A. R. Sheik, Hydro and Electrometallurgy Department, Council of Scientific and Industrial Research (CSIR)-Institute of Minerals and Materials Technology, Bhubaneswar, India

ABSTRACT This paper studies the characterization and dissolution of a Nigerian pyrolusite ore, reporting the results of ore physicochemical analyses and detailed ore characterization before and after leaching at optimal conditions. Ore dissolution rate increased proportional to acid concentration and temperature, but decreased with ore particle size. In a 4 M H2SO4 solution at 80°C with a particle size of –90+75 μm and moderate agitation, ore dissolution rate reached 78.7%. Unleached residue produced under optimal leaching conditions consisted of silica with admixtures of cristobalite and stishovite. The calculated activation energy supported the proposed diffusion control mechanism for the process.


 

Mine conveyance safety: The evolution and regulation of safety catches

B. Galy and L. Giraud, Institut de recherche Robert-Sauvé en santé et en sécurité du travail, Montréal, Quebec, Canada

ABSTRACT This paper compares Canadian provincial mining safety regulations regarding the use and testing of cage safety catches, including a brief history and evolution. Regulations are similar across provinces, with only slight variations. Currently, the “Ontario-type” safety dog is the most commonly used safety catch in Canada. Performance estimation of the compensation mechanism for different safety-dog shapes and tooth angles show this shape works well and has consistent braking results, but the best efficiency is obtained for initial tooth angles greater than 10°. Miner safety is questionable for lightly loaded cages, an issue that should be addressed technically and legislatively.


 

Measuring roof-bolt response to axial and shear stresses: Laboratory and first 
in-situ analyses

J. Stachulak, MIRARCO Mining Innovation, Sudbury, Ontario, Canada; M. Gangal, Natural Resources Canada, CanmetMINING, Ottawa, Ontario, Canada; C. Allen, Vale Ontario Operations, Copper Cliff, Ontario, Canada

ABSTRACT Roof bolts are subjected to axial stresses, shear stresses, or both. Axial and shear stresses were compared between roof bolts machined with two and three slots. Shear stresses perpendicular to and at an angle to the shear planes were evaluated by analyzing a three-slot instrumented roof bolt, performing laboratory tests on two- and three-slot roof bolts, and conducting in-situ test analyses. Three-slot bolts appear to provide a complete bending strain profile, requiring no prior knowledge of the estimated shear-plane orientation. Minimum displacements occur in roof bolts installed perpendicular to rather than at an angle to the shear planes.

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Canadian Metallurgical Quarterly cover
Papers in CMQ, Vol. 54, No. 1.
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www.cmq-online.ca

Investigation of dissolution kinetics of zinc from smithsonite in 5-sulphosalicylic acid solution

D.D. Wu, S.M. Wen, State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming, China; J. Yang, Kunming Vocational and Technical College of Industry, Anning, China; and J.S. Deng, State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming, China

Uptake of nickel ions from aqueous solutions using protonated dry alginate beads

A. Aracena, N. Guajardo, Escuela de Ingeniería Química, Pontificia Universidad Católica de Valparaíso, Valparaíso, Chile; J.P. Ibáñez, Departamento de Ingeniería Metalúrgica y de Materiales, Universidad Técnica Federico Santa María, Valparaíso, Chile; O. Jerez, Instituto de Geología Económica Aplicada (GEA), Universidad de Concepción, Concepción, Chile; and C. Carlesi, Escuela de Ingeniería Química, Pontificia Universidad Católica de Valparaíso, Valparaíso, Chile

Effect of chilling and cerium addition on microstructure and cooling curve parameters of Al–14%Si alloy

A. Elsayed, V. Vijayan, K. Narayan Prabhu, Department of Metallurgical and Materials Engineering, National Institute of Technology Karnataka, Surathkal, Srinivasnagar, Mangalore, India

Effects of strain aging at 373 K in wires of NiTi shape memory alloy

A. Elsayed, V. Vijayan, K. Narayan Prabhu, Department of Metallurgical and Materials Engineering, National Institute of Technology Karnataka, Surathkal, Srinivasnagar, Mangalore, India

Effect of TiO2 addition on viscosity and structure of CaO–Al2O3 based mould fluxes for high Al steel casting

L. Li, Q.F. Shu, K.C. Chou, State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing, China, and School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, China

Improvement for sulphidation roasting and its application to treat lead smelter slag and zinc recovery

Y.-X. Zheng, W. Liu, W.-Q. Qin, J.-W. Han, K. Yang, H.-L. Luo, D.-W. Wang, School of Minerals Processing and Bioengineering, Central South University, Changsha, China

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