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.

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

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.

Synthesis and Characteristics of Inorganic Polymer Materials Geopolymerized from Ash of Brickyard

2019 ◽  
Vol 961 ◽  
pp. 45-50 ◽  
Author(s):  
Hoc Thang Nguyen
Keyword(s):  
Compressive Strength ◽  
Water Absorption ◽  
Sodium Hydroxide ◽  
Sodium Hydroxide Solution ◽  
Raw Material ◽  
Polymer Materials ◽  
Inorganic Polymer ◽  
High Porosity ◽  
Hydroxide Solution ◽  
Geopolymer Paste

Inorganic polymer materials known as geopolymer-based materials are always interesting topics for researchers. Geopolymer is environmentally friendly material which has been potential applications for many different fields such as technical materials, building materials, insolation or refractories, and others. This study used ash of brickyard (AB) as a raw material for geopolymerization process to develop novel materials with high porosity. AB is industrial waste of the brick factories that need to be managed to reduce their negative impact to the environment. AB contains high alumino-silicate resources were mixed with sodium hydroxide solution for 10 minutes to obtain the geopolymer pastes. Sodium hydroxide solution was used as an alkaline activator to form geopolymer paste. The geopolymer paste was filled into 5-cm cube molds according to ASTM C109/C109M 99, and then cured at room temperature for 28 days. These products were then tested for compressive strength, volumetric weight, and water absorption. Results indicated that the material can be considered lightweight with a compressive strength at 28 days that are in the range of 8.1 to 15.4 MPa, volumetric weight around 600kg/m3 and water absorption is under 210.65 kg/m3. The properties of geopolymer products were also determined by analytical techniques that included mineral composition by X Ray Diffraction (XRD) and microstructure by scanning electron microscope (SEM).

scholarly journals Compressive Strength of Fly ash-based Geopolymer Concrete with a Variable of Sodium Hydroxide (NaOH) Solution Molarity

2018 ◽  
Vol 147 ◽  
pp. 01004 ◽  
Author(s):  
Herwani ◽  
Ivindra Pane ◽  
Iswandi Imran ◽  
Bambang Budiono
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Sodium Hydroxide ◽  
Raw Materials ◽  
Sodium Hydroxide Solution ◽  
Solution Concentration ◽  
Geopolymer Concrete ◽  
Hydroxide Solution ◽  
Naoh Solution ◽  
New Material

Geopolymer concrete is a new material made by activating the raw materials which contain many elements of silica and alumina. Compressive strength of geopolymer concrete produced was influenced by the concentration of the activator solution. This paper presents an experimental investigation into fly ash-based geopolymer concrete. Research objective was to investigate the effects of alkaline activator solution (AAS) molarity on compressive strength of geopolymer concrete. Variable of the test were a solution to sodium hydroxide was chosen as the activator solution. Concentration of sodium hydroxide solution used was 10 M, 12 M and 14 M with ambient curing. The specimen is made of concrete cylinder with diameter 10 cm and height 20 cm as many as 9 pieces each variable. Compressive strength tests is performed when the concrete is 7, 14, and 28 days old. Results of the test are indicated that the increasing of sodium hydroxide (NaOH) solution concentration leads to improve the compressive strength of geopolymer concrete. The optimal compressive strength of geopolymer concrete was achieved at a concentration of sodium hydroxide solution (NaOH) of 12 M. Geopolymer concretes compressive strength only achieves around 50-60% of the planned.

Sign in / Sign up

Export Citation Format

Share Document