Influence of halides on kinetics of copper dissolution in sodium hydroxide

1982 ◽  
Vol 47 (8) ◽  
pp. 2037-2043 ◽  
Author(s):  
Milica Miadoková ◽  
Peter Sušinka ◽  
Alena Korintušová
Keyword(s):  
Single Crystal ◽  
Sodium Hydroxide ◽  
Sodium Hydroxide Solution ◽  
Copper Single Crystal ◽  
Kinetic Behaviour ◽  
Hydroxide Solution ◽  
Copper Dissolution ◽  
Zero Charge ◽  
Kinetics Of Dissolution ◽  
Kinetics Of

The influence of F-, Cl-, Br-, and I- ions on the kinetics of dissolution of (100) and (111) faces of a copper single crystal in a sodium hydroxide solution in the presence of oxygen was investigated. The results are interpreted in terms of adsorbability of the anions. Differences between the crystal faces are attributed both to the potentials of zero charge and to the different kinetic behaviour of these faces in pure sodium hydroxide solutions.

Kinetics of corrosion action of aluminum in sodium hydroxide solution

2013 ◽  
Vol 25 (7) ◽  
pp. 1701-1704 ◽  
Author(s):  
张豪 Zhang Hao ◽  
邢丕峰 Xing Pifeng ◽  
李萍 Li Ping ◽  
赵利平 Zhao Liping ◽  
杨蒙生 Yang Mengsheng ◽  
...  
Keyword(s):  
Sodium Hydroxide ◽  
Sodium Hydroxide Solution ◽  
Hydroxide Solution ◽  
Kinetics Of

Kinetics of Leaching Silicon from the Acid Leaching Residue of Pyrolusite

2013 ◽  
Vol 634-638 ◽  
pp. 357-361
Author(s):  
Hai Feng Su ◽  
Chao Chen ◽  
Qing Lu ◽  
Yan Xuan Wen ◽  
Jing Su
Keyword(s):  
Sodium Hydroxide ◽  
Sodium Hydroxide Solution ◽  
Acid Leaching ◽  
Raw Material ◽  
Pressure Leaching ◽  
Hydroxide Solution ◽  
Naoh Solution ◽  
Shrinking Core ◽  
Kinetics Of ◽  
Arrhenius Expression

The content of SiO2 was more than 60% in the residue of pyrolusite detached manganese by reduction roasted and acid leached, and it was a better siliceous raw material because of less other impurities. Through leaching silicon process in the residue of pyrolusite with alkali at atmospheric pressure, leaching kinetics of silica in the sodium hydroxide solution was researched. The effects of the leaching temperature and the concentration of sodium hydroxide solution on the leaching behavior of silica from acid-leached pyrolusite slag were examinted. It was found that the extracting rate of silica is significantly influenced by the temperature, and the concentration of NaOH solution. The experimental datas were well interpreted with a shrinking core model under chemical control. On the basis of the Arrhenius expression the apparent activation energy of 77.69 kJ/mol and a reaction order of 0.34 for the extraction of silica was evaluated.

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