Data for: Study on the Oxygen Gas Holdup and Kinetics Using Various Types of Paddle During Sphalerite Leaching Process

Published: 31-07-2018| Version 1 | DOI: 10.17632/3b6d27jtgk.1
Contributors:
Yan Liu,
zhifeng xu,
Lijie Chen,
Lei Tian

Description

In this paper, the effects of various types of paddle on the oxygen gas holdup in different regions were investigated with temperature 403 K, oxygen partial pressure 0.6 MPa, agitation rate 500 r/min. The results illustrate that the application of self-priming agitator could significantly promote bubble holdup in solution. Furthermore, experiments determining the effects of agitation rate, temperature, and oxygen partial pressure on gas holdup were carried out, where gas holdup increased from 0.03 to 1.59% with agitation rate from 200 to 700 r/min, 0.83 to 1.06% with temperature from 363 to 423 K and 0.50 to 1.27% with oxygen pressure 0.1 to 0.8 MPa. The kinetics of oxygen pressure acid leaching of sphalerite by using various types of paddle were also studied. the activation energies of Zn leaching by using various types of paddle were determined to be 53.23,56.30,59.76 and 67.58 kJ·mol-1, which show that the processes were controlled by surface chemical reactions. Through the comparison of activation energies, the self-priming type agitator was optimal. Finally, the similar criteria relationship of self-priming agitator was established by Homogeneous Principle and Buckingham’s theorem. Comprehensively, empirical equation of gas holdup was deduced on basis of experimental data and similarity theory, where the criterion equation was determined. It can be seen from the formula that agitation rate made the most impact on gas holdup in the pressure leaching process using the self-priming agitator.

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