Microwave-Assisted Leaching Vanadium from Stone Coal

2011 ◽  
Vol 189-193 ◽  
pp. 3916-3919 ◽  
Author(s):  
Hong Zhou Ma ◽  
Xin Zhe Lan ◽  
Yao Ning Wang ◽  
Yu Hong Tian
Keyword(s):  
Sulfuric Acid ◽  
Microwave Power ◽  
Orthogonal Design ◽  
Chemical Constituents ◽  
Influence Factors ◽  
Sulfate Solution ◽  
Leaching Rate ◽  
Stone Coal ◽  
Microwave Assisted ◽  
Design Experiments

Technological process of microwave-assisted leaching of vanadium with sulfate solution has been defined on the base of phase and chemical constituents of stone coal. The influence factors such as content of sulfuric acid, microwave power, and leaching time were studied on leaching rate of vanadium from the stone coal. One element experiments and orthogonal design experiments are carried out to achieve optimized parameters. The experimental results showed that the leaching rate of vanadium was improved by the change of influence factors at some range. The single leaching rate of vanadium reached 80.9% under the optimal conditions of sulfuric acid content of 12%, microwave power 539w,leaching time of 2h.

The Contrast Study of Microwave Heating and Traditional Heating Leaching Vanadium from Stone Coal with Sulfuric Acid Solution

2013 ◽  
Vol 774-776 ◽  
pp. 660-663
Author(s):  
Hong Zhou Ma ◽  
Yao Ning Wang ◽  
Xin Zhe Lan
Keyword(s):  
Sulfuric Acid ◽  
Acid Solution ◽  
Microwave Heating ◽  
Sulfuric Acid Solution ◽  
Product Layer ◽  
Contrast Study ◽  
Leaching Rate ◽  
Solid Product ◽  
Stone Coal ◽  
Kinetics Of

The aim of this paper is to contrast the effect of the microwave heating and traditional heating leaching vanadium from stone coal with sulfuric acid solution, contrast the leaching rate of vanadium, kinetics of leaching vanadium and the phase change s of slag. The experiment results show that the leaching rate and leaching velocity of vanadium with microwave heating was higher greatly than traditional heating, the kinetics of leaching vanadium with two heating methods was similar and accords with unreacted core contraction model with have solid product layer model, the illite in the stone coal was decomposed with microwave heating, but the traditional heating could not decomposed.

Influence Factors of Exfoliation Synthesis Exfoliated Graphite from Vietnamese Natural Graphite Flakes Using Microwave Irradiation

2018 ◽  
Vol 279 ◽  
pp. 230-234 ◽  
Author(s):  
Pham Van Thinh ◽  
Nguyen Duy Trinh ◽  
Nguyen Thi Thuong ◽  
Van Thi Thanh Ho ◽  
Bui Thi Phuong Quynh ◽  
...  
Keyword(s):  
Microwave Irradiation ◽  
Microwave Power ◽  
Ph Value ◽  
Influence Factors ◽  
Exfoliated Graphite ◽  
Oxidizing Agent ◽  
Natural Graphite ◽  
Microwave Assisted

In this study, we prepared the exfoliated graphite (EG) using microwave-assisted exfoliation synthesis exfoliated graphite from the inexpensive natural Vietnamese graphite flakes as the precursors. The exfoliation of graphite was conducted employing intercalation method using H2O2 as oxidizing agent and H2SO4 as intercalating agent. The influent of the precursors (VH2O2/VH2SO4) (1.0/20 – 2.0/20), pH value of EG (1-6), time intercalation (70-120 min), microwave power (180-720 W), and time microwave (10-60 second) in the exfoliation volume of EG was investigated.

A Study about Microwave-Assisted Extraction of Polysaccharides Form Medicinal Mushrooms Fomitopsis ulmaria (Sor.: For.) Bond. et Sing

2014 ◽  
Vol 1073-1076 ◽  
pp. 1837-1840 ◽  
Author(s):  
Yi Tao Zhao ◽  
Yu Qin Tang ◽  
Ke Zhen Liu ◽  
Yu Zhang
Keyword(s):  
Microwave Power ◽  
Orthogonal Design ◽  
Extraction Yield ◽  
Extraction Time ◽  
Microwave Assisted Extraction ◽  
Medicinal Mushrooms ◽  
Microwave Assisted ◽  
Assisted Extraction ◽  
Optimized Conditions ◽  
Optimum Extraction

Polysaccharides are main bioactive compounds of Fomitopsis ulmaria (Sor. : For.) Bond. et Sing (F. ulmaria). In this study, microwave-assisted extraction (MAE) method was employed for the extraction of polysaccharides form F. ulmaria (PFU). The important extraction parameters that influenced the extraction yield of PFU were optimized by employing an orthogonal design, including solvent/material ratio, microwave power, and extraction time. The results showed that the optimum extraction conditions were as followings: solvent/material ratio of 40:1 ml/g, microwave power of 400 W, and extraction time of 2.5 min. Under optimized conditions, the extraction yield of PFU was 8.36%. This work is expected to provide a scientific reference for the further research and industrial production of F. ulmaria.

Kinetics of Leaching Vanadium with Sulfuric Acid from Carbonaceous Shale Containing Vanadium

2011 ◽  
Vol 402 ◽  
pp. 7-11
Author(s):  
Yan Liu ◽  
Cong Sun ◽  
Wei Jun Zhong ◽  
Yu Chun Zhai
Keyword(s):  
Sulfuric Acid ◽  
Carbonaceous Shale ◽  
Particle Sizes ◽  
Shrinking Core Model ◽  
Leaching Rate ◽  
Stone Coal ◽  
Rate Of Reaction ◽  
Shrinking Core ◽  
Kinetics Of ◽  
Arrhenius Expression

ηA kinetic study of the leaching of stone coal ore with sulfuric acid has been investigated. The effects of the stirring speed, particle sizes of stone coal, acid concentration, leaching temperature and acid-ore ratio on the leaching rate of vanadium were examined. It was found that the leaching rate of vanadium was significantly influenced by leaching temperature. The shrinking core model was applied to the leaching process and the results showed that the process was based on chemical reaction control. And the rate of reaction was expressed as 1-(1-η)1⁄3=4.98×106·e-55488⁄RT·t. The apparent activation energy for the leaching of vanadium⁄ was calculated to be ¾5⁄5.49 kJ/mol using Arrhenius expression.

scholarly journals Effect of Microwave Power on Performance of Microwave-Assisted Spark Ignition under CO2-Diluted Condition

2021 ◽  
Vol 692 (2) ◽  
pp. 022001
Author(s):  
Xinhua Zhang ◽  
Zhaowen Wang ◽  
Huimin Wu ◽  
Chaohui Liu ◽  
Zhihao Wang ◽  
...  
Keyword(s):  
Microwave Power ◽  
Spark Ignition ◽  
Microwave Assisted

Microwave Assisted Synthesis of Schiff Bases: A Green Approach

2012 ◽  
Vol 10 (1) ◽  
Author(s):  
Mousumi Chakraborty ◽  
Sanjay Baweja ◽  
Sunita Bhagat ◽  
TejpalSingh Chundawat
Keyword(s):  
Microwave Irradiation ◽  
Microwave Power ◽  
Mass Spectra ◽  
Molar Ratio ◽  
Microwave Assisted Synthesis ◽  
Schiff’S Bases ◽  
Microwave Assisted ◽  
Green Approach ◽  
Schiff's Bases ◽  
Effects Of Temperature

Abstract In the present study Schiff’s bases are synthesized by the conventional as well as by microwave irradiation. Excellent yield within short reaction time is obtained using microwave irradiation along with other advantages like mild reaction condition, non-hazardous and safer environmental conditions. The effects of temperature, reactant molar ratio, and microwave power variation on yield are observed. Mathematical model has been developed using matlab software to obtain the yield as a function of microwave power. Kinetic study of the reaction has also been attempted. Schiff’s bases structures are confirmed by IR, 1HNMR, Mass Spectra and elemental analysis.

scholarly journals Effects of Ultrasonic-Microwave-Assisted Technology on Hordein Extraction from Barley and Optimization of Process Parameters Using Response Surface Methodology

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Xiao Guan ◽  
Lv Li ◽  
Jing Liu ◽  
Sen Li
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Microwave Power ◽  
Process Intensification ◽  
Extraction Yield ◽  
Extraction Time ◽  
Quadratic Model ◽  
Ultrasonic Power ◽  
Microwave Assisted ◽  
The Difference

We investigated the process intensification of ultrasonic-microwave-assisted technology for hordein extraction from barley. Response surface methodology was utilized to optimize the extraction conditions and to analyze the interaction between four selected variables: temperature, microwave power, ultrasonic power, and extraction time. The validated extraction yield of hordein reached 8.84% at 78°C, microwave power 298 W, and ultrasonic power 690 W after 20 min as optimum conditions. Compared with traditional water-bath extraction (4.7%), the ultrasonic-microwave-assisted technology effectively increased the hordein extraction yield and shortened the extraction time. According to the obtained quadratic model (R2 = 0.9457), ultrasonic power and extraction time were the first two significant factors. However, temperature limited the effects of other factors during extraction. SDS-PAGE and scanning electron microscopy were used to identify the hordein extract and to clarify the difference between the two hordein fractions extracted with new and traditional methods, respectively. Ultrasonic-microwave-assisted technology provided a new way to improve hordein extraction yield from barley and could be a good candidate for industrial application of process intensification.

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