EPD Congress 2016 by Antoine Allanore, Laura Bartlett, Cong Wang, Lifeng Zhang,

By Antoine Allanore, Laura Bartlett, Cong Wang, Lifeng Zhang, Jonghyun Lee

EPD Congress is an annual assortment that addresses extraction and processing metallurgy. The papers during this ebook are drawn from symposia held on the 2016 Annual assembly of The Minerals, Metals & fabrics Society. The 2016 variation contains papers from the next symposia: •Materials Processing basics •Advanced Characterization innovations for Quantifying and Modeling Deformation

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By Antoine Allanore, Laura Bartlett, Cong Wang, Lifeng Zhang, Jonghyun Lee

EPD Congress is an annual assortment that addresses extraction and processing metallurgy. The papers during this ebook are drawn from symposia held on the 2016 Annual assembly of The Minerals, Metals & fabrics Society. The 2016 variation contains papers from the next symposia: •Materials Processing basics •Advanced Characterization innovations for Quantifying and Modeling Deformation

Show description

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6 s. The kinetics of hydrogen reduction of hematite concentrate particles was studied previously by Chen et al. [9] and the nucleation and growth kinetics model was found to best describe the reduction kinetics. Based on their studies, the nucleation and growth kinetics expression given by the following equation was tested and was found to describe the reduction rate of magnetite concentrate particles: (− Ln(1-X)) 1/ = (− Ln(1-X)) 1/ = k' × × f( t 2 )× h ( ) × t (1) (2) is the apparent rate constant, k' is the where X is the iron fraction, n is the Avrami parameter, is the activation energy for the reaction, f( 2 ) is the function for the pre-exponential factor, hydrogen partial pressure dependence, h( ) is the particles size dependence function and t is the nominal particle residence time.

9, 10]. During heating up the reactor, nitrogen gas was flowed until the target temperature was reached then the reducing gas was introduced according to the experiment conditions. Nitrogen gas was added to adjust the partial pressure of the hydrogen and the nominal particle residence time. Gases flow rates were controlled using rotameter flow meters. Once all the gases are introduced and the reactor temperature is stable, magnetite concentrate is fed into the reactor at the specified feeding rate.

A liquid phase emerges in equilibrium with Ni3±xS2, Cu2±xS, and a Cu-Ni solid solution at an isothermal T = 873 K. (b) (a) Figure 3. (a) Phase diagram of Cu2S-NiS system, modified from [55], (b) isothermal section of the Cu-Ni-S system at 1273 K, modified from [54]. %. Bruwer [54] experimentally studied the Cu-Ni-S system in the temperature range from 700 K to 1473 K. An isothermal phase diagram he proposed at 1273 K is shown in Figure 3(b). According to Bruwer [54], in the temperature range from 1373 K to 1473 K two immiscible liquid phases coexist in the Cu-rich compositions of the system.

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