CONTACT INFORMATION:
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SUMMARY OF QUALIFICATIONS:
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Post Graduate Certificate, Financial Mathematics, University of Western Australia, 2009
PhD, Chemical Engineering, Loughborough University, Loughborough, 2005
M.Sc. Chemical Engineering, (Occupational Health and Safety), Loughborough University, 2000
B.Sc. Chemical Engineering, University of the West Indies, Trinidad 1996
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WORK EXPERIENCE:
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Financial Modelling/Project Evaluation
Hatch Australia. Western Australia. Project Analyst 2008 – present
Chalco, Aurukun 2.3Mtpa Alumina Refinery Feasibility Study, Queensland, Australia
* Economic evaluation of varying bauxite grades and development of operating cost estimation based on Syscad modelling to calculate operating cost; combining operating and capital cost via a discounted cash flow calculation to report the NPV and IRR for alternative production capacities.
* Determination of the minimum cut off particle size for bauxite ore based on calculating the marginal refining cost vs the marginal increase in mining cost.
* Translating empirical relationships development from laboratory testwork into operating cost impact to assess their significance
Inpex Accommodation Village, Nortern Territory, Australia
* Discounted cash flow and levelized cost of alternative accommodation for 2600 persons capacity for 3 options: build accommodation village; acquire existing accommodation or use hotels with fighting in/out contracts.
Saudi Arabian Mining Company, (Ma'aden), Riyadh, Saudi Arabia
* Semi- quantitative evaluation of alternative digestion technology to minimise operating cost and manage process risks.
Process Engineering
Ausenco, Perth, Senior Chemical Engineer 2007 - 2008
* Technical documentation for Minara High Density Sludge project: Process Flow Diagrams (PFD's), Process and Instrumentation Diagrams (PID's), Basis of Process Design, Functional Specification.
* Technical design including mass and energy balance for evaluating alternative Iron removal options, preparation of the design criteria and PFD's used for capital cost estimating.
* Syscad modelling of Falling film evaporator, plate and frame heat exchangers to verify and evaluate bids from vendors.
Hatch Australia. Western Australia. Alumina Specialist 2004 - 2007
* Pre-feasibility Expansion Study of Worsely Alumina - Development of PFD's and PID's for lime slaking, high pressure grinding rolls, DSM screens, Bauxite cyclone, hydrate seed filtration and calcination. Coordination of the final reports
* Bauxite Characterization of Boehmitic and Diasporic Ores: Technical evaluation of experimental results
* Concept Study for expansion of Wagerup 3 Early Work Programme: Site support for the clarification area, inclusive of sand removal, mud washing/CCD, and residue disposal;;
Alcan Jamaica Limited- Kirkvine/Ewarton Works, Process Development Engineer 1998 –2001
* Site Support Projects: Inventory for caustic and flocculant consumption and production audits Alcan Alumina plants; development of user PI interface (Honeywell DCS) for the monitoring and controlling process areas; energy and material balance for optimizing the location of a new heat transfer unit.
* Plant Optimisation Projects: Optimisation of kiln operations with respect to specific surface area and loss on Ignition; investigation of high zinc in product, extraction limitations Alcan Alumina plants; Optimisation of kiln oil consumption using oil viscosity.
* Environmental Projects: Neutralisation of waste acid with alkaline discharge stream, particulate measurement and governmental reporting.
Alcan Jamaica Limited – Kirkvine Works. Jamaica. Process (Production) Engineer
* Providing technical support to operations on a daily basis
* Production Engineering: providing technical support and optimization of all areas within the bauxite grinding, impurity removal, digestion, cyclone and heat transfer unit operations.
* De-bottlenecking major flow restrictions associated with counter current mud washing
* Supervision of annual start-up and shut down of bauxite storing, grinding, digestion (caustic leach) and decantation units
* Inspection of overall maintenance operations of ball mills, digesters, desilication tanks
National Rums of Jamaica, Supervisor and Process Engineer 1997
* Supervision of production laboratory performance and personnel
* Supervision of the fermentation, distillation, cooling towers and reverse osmosis units
* Procurement of all raw materials for the rum production and power house facilities
* Daily inventory for raw materials and alcohol production
Environmental Solutions Limited, Project Engineer 1997- 1998
* Project engineer on: indoor air quality; potable water; new sewerage installation, evaluation of existing sewerage system projects
* Environmental Impact assessment of new housing developments
* Preparation of Emergency Evacuation Manual for Belize Electricity Companies
* Environmental Impact Assessment for St. Mary, Jamaica housing development plan
* Project management of Negril and Ocho Rios sewerage system housing connections
* For litigation reasons, researched the relationship between high voltage power line on human health for government back expansion project of the National Electricity Company (Jamaica Power Supply – JPS)
Research and Development
Loughborough University, United Kingdom, Research Student 2001 – 2004
* Demonstration experiments and tutoring Second Year Reactions Engineering
* One-off lectures on Temperature Programmed Techniques using Mass Spectroscopy and Electrochemical Techniques including impedance spectroscopy (2 and 4 point), electrochemical pumping and 4 point D.C. measurements
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EDUCATION & CERTIFICATION:
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TECHNICAL PAPERS
Johnson, VS, Hellgardt, K, Dann, SE, et al, Synthesis and characterisation of a potential ceramic sulfide ion conductor based on the solid solution xCaS: Nd2S3, x=0.7-1.0, International Conference on Nonstoichiometric Compounds, 2007, Pages: 1948 - 1954, ISBN: 0022-2461
Determination of the conduction type of High Temperature Solid-Sulphide BaIn2S5 System, V.S. Johnson, K. Hellgardt, S.E. Dann, R. Whiter, 3rd International conference on Materials for Advanced Technologies, 2005, Singapore
Johnson, VS, White, RJ, Dann, SE, et al, Structural investigation of the high-temperature oxidation of bismuth sulfide using TPO-MS and in situ X-ray diffraction techniques, IND ENG CHEM RES, 2004, Vol: 43, Pages: 3127 - 3132, ISSN: 0888-5885
Electrochemical pumping of sulphur using the sulphide ion conductor CaNd2S4, Asian Conference on Solid State Ionics, V.S. Johnson, K. Hellgardt, S.E. Dann, R. Whiter, Solid State Ionics, South Korea, 2004
Instability of Impedance Arcs in the Characterization of Potential Sulphide Ion Conductors, 13th Asian Conference on Solid State Ionics, V.S. Johnson, K. Hellgardt, S.E. Dann, R. Whiter South Korea, 2004
Synthesis and characterization of sulphide ion conductors, V.S. Johnson, K. Hellgardt, S.E. Dann, R. Whiter, Solid State Ionics, 2003,
Electrochemical Control of Catalyst Selectivity: Partial Oxidation of Propene over Ag, Solid State Ionics Conference, Monterey, V.S. Johnson, K. Hellgardt, 2003
Potential Ceramic Sulphide Ion Conductors: Synthesis and Characterization, Royal Society of Chemistry - Solid State Group Meeting, Loughborough, V.S. Johnson, K. Hellgardt, S.E. Dann, R. Whiter, 2003
Assessing the Occupational Healthiness of Process Routes, V. S. Johnson & K. Hellgardt, American Society of Chemical Engineers, 2002, USA
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ADDITIONAL INFORMATION:
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PROFESSIONAL DEVELOPMENT
Graduate Certificate Financial Mathematics, 2008: Corporate and Quantitative Finance, Operations Research and Numerical Analysis
Syscad Steady State Mass and Energy Balance Modelling 5 day course, 2007
JKSimMet 3 day Modelling course, 2007
Gold Processing Technology Course 3 day course, 2006
Fundamentals of Project Management, 2005
ISO 9000 Implementation 3 day training, 1997
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