J. Pierre Constantineau

• Doctor of Philosophy
• Consultant at Honeywell

Agglomeration in the fluidized bed roasting of zinc sulphide concentrate was investigated in a continuous pilot-scale fluidized bed roaster. Alone or together, low stoichiometric excess oxygen (940°C) contributed most significantly to agglomeration of zinc calcine particles. Only one test – with 0% excess oxygen at 940°C – led to severe agglomerati...

At less than 650°C, the oxidation of lead sulfide (PbS) with oxygen to produce lead sulfate (PbSO4) was found to have a very low activation energy of 10kJ/mole, a reaction order with respect to oxygen of ∼0.5, and one with respect to sulfur dioxide of 0, though the presence of sulfur dioxide was necessary to sustain the reaction. These kinetic para...

A generalized slugging–bubbling fluidized bed reactor model is developed which handles seamlessly the transition from bubbling to slugging fluidization, using the concept of probabilistic averaging developed in earlier work. The ratio of the bubble diameter to the column diameter is employed to correlate the probability of each of these fluidizatio...

Thesis (Ph.D.)--University of British Columbia, 2004. Includes bibliographical references.

The use of fluidized beds for the roasting of zinc sulphide concentrates marked a milestone in the electrolytic production of zinc. Stable operation of a fluidized bed for zinc roasting requires a particle size distribution that minimizes the risk of defluidization and helps control carryover to manageable levels. However, the understanding of the...

A new type of diagram is proposed to describe gas-solid reactions. These diagrams, called modified predominance diagrams, unite thermodynamics and kinetics into a new tool that should prove useful in many metallurgical and chemical systems. They are created from predominance diagrams by applying a mathematical transformation derived from basic tran...