Title page for ETD etd-08012005-152333


Type of Document Master's Thesis
Author Sarver, Emily Allyn
Author's Email Address esarver@vt.edu
URN etd-08012005-152333
Title The Ferrous Regeneration Process for Use in Alternate Anode Reaction Technology in Copper Hydrometallurgy
Degree Master of Science
Department Mining and Minerals Engineering
Advisory Committee
Advisor Name Title
Adel, Gregory T. Committee Chair
Fuerstenau, Maurice Committee Member
Luttrell, Gerald H. Committee Member
Novak, Thomas Committee Member
Sandoval, Scot Committee Member
Keywords
  • AART
  • mass transfer kinetics
  • activated carbon
  • ferric reduction
  • sulfur dioxide oxidation
Date of Defense 2005-07-26
Availability unrestricted
Abstract
The Fe(II) regeneration process is an important aspect of Alternate Anode Reaction Technology (AART) using Fe(II)/Fe(III)-SO2 reactions for copper hydrometallurgy; however little has been done to study it specifically. The process regenerates Fe(II) via Fe(III) reduction by SO2(aq), catalyzed by activated carbon particles. To better understand and improve the process, two studies have been conducted with respect to variable factors and their affects on the regeneration.

A study of fundamental kinetics confirms that the regeneration reaction is mass transfer-controlled, requiring adsorption of reactants onto the catalyst surface for reaction. The reaction rate is limited by the diffusivity of Fe(III). Initial Fe(III) concentration and carbon particle size are determined to be the most influential factors on the rate under the condition studied. Furthermore, it is observed that flow rate may inhibit the reaction by reducing ion diffusivity. A rate expression for the regeneration is derived and experimentally validated, and the Fe(III) diffusivity is determined to be 1.1x10-7 cm2/s.

An optimization problem is also developed and solved for the process, constrained by the requirement that negligible SO2 could be present in the process effluent. Before optimization, a relationship is developed between regeneration rate and variable factors. Again, carbon size and initial Fe(III) are the most influential factors on the regeneration rate, related to it linearly; temperature is significant with a squared relationship to the rate; initial SO2 is insignificant. Optimal conditions are found with minimum carbon particle size, maximum initial Fe(III) concentration, and moderate temperature.

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