scholarly journals Magnesium removal from phosphoric acid by precipitation: Optimization by experimental design

2020 ◽  
pp. 30-30
Author(s):  
Ahmed Mahrou ◽  
R. Jouraiphy ◽  
H. Mazouz ◽  
A. Boukhair ◽  
Mohammed Fahad
Keyword(s):  
Experimental Design ◽  
Phosphoric Acid ◽  
Removal Efficiency ◽  
Steam Consumption ◽  
Composite Matrix ◽  
Optimum Parameters ◽  
Phosphate Industry ◽  
Screening Study ◽  
Magnesium Removal ◽  
Experimental Design Methodology

High content magnesium in phosphate and phosphoric acid affect negatively the performance and operating condition in phosphate industry. While for a content more than 0, 3% in phosphate increase the P2O5 losses during phosphate digestion and filtration, also increase steam consumption and solid settling kinetics during concentration. In this work, the removal of magnesium from phosphoric acid by precipitation in one of the compounds MgAlF5 or MgAl2F8 was studied. Magnesium precipitation is achieved by the simultaneous addition of aluminum and fluorine. The experimental design methodology was used to carry out this work. Tests were conducted according to the NEMRODW software using industrial quality phosphoric acid. The screening study of parameters affecting the removal efficiency of magnesium from industrial wet phosphoric acid showed that from the following parameters: temperature, F/Mg and Al/Mg ratios, aluminum form and fluorine form, only temperature and F/Mg ratio have an effective influence on magnesium removal. The optimization of magnesium removal from phosphoric acid was performed according to the response surface methodology using a composite matrix. By applying this methodology, the optimum parameters corresponding to a maximum magnesium removal efficiency in phosphoric acid were determined. The values of the optimum parameters obtained by this method are T?=80?C, ratio Al/Mg=1 and F/Mg= 16.

Study of the Removal of Boron from Metallurgical Grade Silicon by Oxidation Slagging Method

2010 ◽  
Vol 156-157 ◽  
pp. 882-885 ◽  
Author(s):  
Yu Yan Hu ◽  
Dong Liang Lu ◽  
Tao Lin ◽  
Yu Liu ◽  
Bo Wang ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Orthogonal Experiment ◽  
Slag System ◽  
Refining Process ◽  
Impact Factors ◽  
Metallurgical Grade Silicon ◽  
Optimum Parameters ◽  
Grade Silicon ◽  
Refining Time ◽  
The Impact

Refining of solar grade silicon by metallurgical method is the research hotspot of polycrystalline field. Slagging method is benefit to the removal of the impurities especially to boron exsisted in the raw silicon. In this study, the influence of the density, the viscosity and liquidus temperature of the slag components on the refining process were discussed, and then the slag system SiO2-Na2CO3 was choosed as the slagging agents. And then the impact factors on the removal efficiency of boron such as the composition of SiO2 and Na2CO3, the ratio of slag to silicon and the refining time were investigated by the orthogonal experiment. The results showed that the optimum parameters of the oxidation refining for removing boron were as follows: the main composition of the oxidant is “SiO2 : Na2CO3 = 60% : 40%”; the slag/silicon ratio is 0.5; time for refining is 60min at 1550 . The results indicated that the removal efficiency of boron was 88.28%, and the content of boron in MG-Si can be reduced to 7ppmw under the best refining process¬.

Experimental Design Methodology Based in the Synthesis Parameters to Enhance the Electrochemical Properties in Doped Carbon Nanotubes

2021 ◽  
Vol MA2021-02 (6) ◽  
pp. 525-525
Author(s):  
Isaias Zeferino González ◽  
Ana Valenzuela-Muniz ◽  
Yoana Ugarte Ollarves ◽  
Cherif Ben Youssef-Brants ◽  
Ysmael Verde Gomez
Keyword(s):  
Carbon Nanotubes ◽  
Experimental Design ◽  
Electrochemical Properties ◽  
Design Methodology ◽  
Synthesis Parameters ◽  
Experimental Design Methodology

The use of experimental design methodology for investigating a lipid oxidation rate assay

2008 ◽  
Vol 91 (2) ◽  
pp. 164-172
Author(s):  
Martin Høy ◽  
Revilija Mozuraityte ◽  
Vegard Segtnan ◽  
Ivar Storrø ◽  
Bjørn Helge Mevik ◽  
...  
Keyword(s):  
Experimental Design ◽  
Lipid Oxidation ◽  
Oxidation Rate ◽  
Design Methodology ◽  
Experimental Design Methodology

scholarly journals Ozone removal efficiency of the KI-denuder in the carbonyl sampling

2019 ◽  
Vol 2 (5) ◽  
pp. 153-160
Author(s):  
Huy Huu Duong ◽  
Vui Thi Kim Tran ◽  
Chuong Thanh Nguyen ◽  
Hien Thi To
Keyword(s):  
Removal Efficiency ◽  
Flow Rate ◽  
Carbonyl Compounds ◽  
Climatic Conditions ◽  
Ho Chi Minh City ◽  
High Humidity ◽  
Optimum Parameters ◽  
Sampling Flow Rate ◽  
High Humidity Condition ◽  
Sampling Flow

In the carbonyl sampling of 2, 4- dinitrophenylhydrazine (DNPH) impregnated cartridge, the ozone removal was necessary because ozone reacted with the DNPH derivatives. A commercial ozone scrubber was usually used to remove O3. However, high humidity leaded to carbonyl compounds being trapped on the ozone scrubber before passing through the DNPH cartridge. The purpose of this study was to assess the ozone removal by KI-denuder under the climatic conditions of Ho Chi Minh City. Several parameters including air sampling flow rate and denuder length were optimized to achieve the highest removal efficiency. The optimum parameters of the KI denuder were the sampling flow rate of less than 1 L/min, and the denuder length of 20 cm. The effect of the initial O3 concentration on the removal efficiency was also investigated. Finally, the ozone removal efficiency of KI-denuder was compared to that of ozone scrubber when two devices were applied for the carbonyl sampling during field measurement. The results show that KI-denuder could be used to replace the ozone scrubber with high removal efficiency, particularly in high humidity condition. In conclusion, KI-denuder was effective, simple, easy to use and cheap. Therefore, it was encouraged to use in carbonyl sampling.

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