Experimental Study on Extraction of Scandium from Complex Silicate Ore

2013 ◽  
Vol 734-737 ◽  
pp. 1037-1040
Author(s):  
Qing Rong Yang ◽  
Gui Fang Zhang ◽  
Peng Yan
Keyword(s):  
Experimental Study ◽  
Organic Phase ◽  
Mixing Time ◽  
Extraction Rate ◽  
Impact Factors ◽  
Optimal Conditions ◽  
Extractant Concentration ◽  
Leaching Experiments ◽  
The Impact ◽  
Extraction Agent

Based on leaching experiments of complex silicate ore contenting scandium, the research has adopted extraction to concentrate scandium and separate impurity. The emphasis of this reaserch is the impact factors, so the experiments including extractant concentration, organic aqueous ratio, mixing time, organic phase washing, organic phase reextraction, have been conducted. The optimal conditions are that the concentration of extraction is 25%, the O/A is 1:10, the mixing time is 3min, the washing time is 3, the O/A of reextraction is 1:2.3, and the extraction rate of exceeding 98% and reextracion rate of 99.01% were obtained when adopting P501 as the extraction agent.

scholarly journals Experimental study of phase entrainment in copper solvent extraction

DYNA ◽  
2020 ◽  
Vol 87 (213) ◽  
pp. 85-90
Author(s):  
Patricio Navarro Donoso ◽  
Cristian Vargas Riquelme ◽  
Jonathan Castillo ◽  
Rossana Sepúlveda
Keyword(s):  
Experimental Study ◽  
Solvent Extraction ◽  
Aqueous Phase ◽  
Organic Phase ◽  
Copper Concentration ◽  
Mixing Time ◽  
Phase 1 ◽  
Initial Ph ◽  
Copper Solvent Extraction ◽  
Displacement Speed

The entrainment of the organic phase in the aqueous applied to typical solutions in a solvent extraction of copper process was studied. The organic phase used is composed of the commercial extractant LIX 984-N diluted in Shellsol 2046 AR. The aqueous phase contains 6 g/L of Cu2+, at pH 2  and 20 ºC. The variables studied were: mixing speed of 400 to 1000 rpm; mixing time of 3 to 30 minutes; initial pH of the electrolyte 2, 3, and 4; percentage of extractant in the organic phase 10 to 30% v/v; and copper concentration in the aqueous phase 1 to 6 g/L. It was determined that the entrainment of the organic phase in the aqueous is determined by the physical properties of the phases in equilibrium and by the system’s hydrodynamics, and it is a phenomenon that involves the advancing speed of the interphase (or dispersion band) and the displacement speed of the organic drops.

Experimental Study on the Impact of Oxygen Lances on Bath Mixing in EAF

2011 ◽  
Vol 402 ◽  
pp. 425-431 ◽  
Author(s):  
Li Xue Qin ◽  
Da Qiang Cang ◽  
Dong Xu ◽  
Jian Feng Duan
Keyword(s):  
Experimental Study ◽  
Fluid Flow ◽  
Mixing Time ◽  
Length Scale ◽  
Cold Model ◽  
Vertical Angle ◽  
Horizontal Angle ◽  
Scale Down ◽  
The Impact ◽  
Local Fluid Flow

Stirring characteristics of wall oxygen lances of EAF and bath mixing under different conditions were studied by using an 1/10 length scale down of cold model of 100-ton capacity EAF. The effects of horizontal angle, vertical angle of a lance and the distribution of lances along the EAF wall on bath stirring and mixing were researched experimentally. The results showed that the horizontal angle of the lances had significant impact on the local fluid flow and mixing time, whereas the mixing time is less affected by the lance vertical angle relatively. It was found that the shortest mixing time had been obtained in the conditions that the horizontal angles were -3°, 0° and -2° respectively under the modified lance distribution in the variant shape of bath. Compared with the mixing time measured in the conditions of the prototype, the average mixing time for p1, p2 and p3 and the mixing time for p4 point were reduced by 52.3% and 44.7% respectively with the optimum scheme.

Experimental Research on the Influence of the Open Mill Mixing Process Technological Parameters on the Mixing Quality

2013 ◽  
Vol 561 ◽  
pp. 400-404
Author(s):  
Xian Kui Zeng ◽  
Dong Wang ◽  
Shuai An ◽  
Shu Hong Zhao ◽  
Guo Zong Song
Keyword(s):  
Experimental Study ◽  
Mixing Time ◽  
Speed Ratio ◽  
Mixing Process ◽  
Experimental Equipment ◽  
Technological Parameters ◽  
Roller Speed ◽  
Experimental Platform ◽  
Mixing Quality ◽  
The Impact

This experiment adapt orthogonal experimental method, producing the experimental study on the impact of the open mill mixing process technological parameters on the mixing quality, using the open mill intelligent mixing experimental platform which are designed and developed dependently and a variety of advanced experimental equipment. Finally, find the optimal technological parameters for the open mill mixing process, and are the roller spacing 0.6mm, the best roller speed 29r/min, the best roller speed ratio 1.25, the best mixing temperature50°C, the best mixing time 18.5min, respectively.

scholarly journals Solvent Extraction of Sc(III) by D2EHPA/TBP from the Leaching Solution of Vanadium Slag

Metals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 790
Author(s):  
Xuejiao Cao ◽  
Ting-an Zhang ◽  
Weiguang Zhang ◽  
Guozhi Lv
Keyword(s):  
Solvent Extraction ◽  
Thermodynamic Analysis ◽  
Organic Phase ◽  
Species Distribution ◽  
Extraction Process ◽  
Optimal Conditions ◽  
Vanadium Slag ◽  
Extractant Concentration ◽  
Leaching Solution ◽  
Loaded Organic Phase

The solvent extraction of scandium by the mixture of di-(2-ethylhexyl) phosphate (D2EHPA) and tri-n-butyl phosphate (TBP) has been investigated in the acidic leaching solution of vanadium slag. Thermodynamic analysis of the species distribution diagrams on the Sc-S-H2O system showed that scandium mainly exists as Sc3+ and Sc(SO4)+, and sulfur mainly exists as HSO4− in the actual leaching solution of vanadium slag (pH = −0.75). The extraction process was studied to optimize various parameters such as the extractant concentration, dosage of TBP, phase ratio, and stirring speed. The results indicated that 83.64% of scandium and less than 2% of co-extracted elements were extracted under optimal conditions. Then, over 95% of the co-extracted elements and less than 1.1% of scandium were scrubbed from the loaded organic phase by 4.0 mol/L of HCl. Finally, 87.20% of scandium was stripped with 2 mol/L of NaOH and 1 mol/L of NaCl at a stripping O/A of 1:1.

Experimental study on the impact factors of electro-osmotic flow in dehumidification applications

2019 ◽  
Vol 202 ◽  
pp. 109388 ◽  
Author(s):  
Shanshan Cai ◽  
Wanyin Huang ◽  
Xu Luo ◽  
Xu Li ◽  
Jiajun Ji
Keyword(s):  
Experimental Study ◽  
Impact Factors ◽  
Osmotic Flow ◽  
The Impact ◽  
Electro Osmotic Flow

scholarly journals Experimental Study of Railway Trackbed Pressure Distribution Under Dynamic Loading

2019 ◽  
Vol 14 (4) ◽  
pp. 504-520
Author(s):  
Mykola Sysyn ◽  
Vitalii Kovalchuk ◽  
Olga Nabochenko ◽  
Yuri Kovalchuk ◽  
Oleg Voznyak
Keyword(s):  
Experimental Study ◽  
Pressure Distribution ◽  
Dynamic Loading ◽  
Railway Track ◽  
Rolling Stock ◽  
Video Observation ◽  
Pressure Measurements ◽  
Optimal Conditions ◽  
Load Cells ◽  
The Impact

Reliable and durable operation of the railway track under the dynamic load of the rolling stock depends considerably on the ability of the ballast layer to get the load from the sleepers and distribute it to the subgrade. In this paper, the experimental study of the distribution properties of the ballast layer under the impact of dynamic loading depending on the density of the ballast layer is carried out. The ballast behaviour during load cycles is estimated by pressure measurements at the ballast prism base along the axis of a sleeper with simultaneous video observation of the ballast particles movement through transparent sidewalls of the box with crushed stone. Measurements of pressure distribution are carried out with the developed microcontroller system of measurements and developed load cells. The system allows performing multi-point measurements of stress in combination with measurements of acceleration and photogrammetry. The results of measurements showed a significant effect of the ballast layer consolidation on the distribution of stresses under the sleeper. The performed research opens up opportunities for practical improvement of the existing types of track structures and the technology of the ballast layer tamping in terms to provide the optimal conditions for the ballast layer operation.

The Impact of Anglicizing Former German-Language Psychology Journals on Authorship and Citation Frequencies

2012 ◽  
Vol 17 (3) ◽  
pp. 190-198 ◽  
Author(s):  
Günter Krampen ◽  
Thomas Huckert ◽  
Gabriel Schui
Keyword(s):  
Side Effects ◽  
English Language ◽  
General Trend ◽  
Native Language ◽  
Impact Factors ◽  
German Language ◽  
Journal Articles ◽  
Number Of Citations ◽  
The Impact ◽  
Number Of Authors

Exemplary for other than English-language psychology journals, the impact of recent Anglicization of five former German-language psychology journals on (1) authorship (nationality, i.e., native language, and number of authors, i.e., single or multiple authorships), (2) formal characteristics of the journal (number of articles per volume and length of articles), and (3) number of citations of the articles in other journal articles, the language of the citing publications, and the impact factors (IF) is analyzed. Scientometric data on these variables are gathered for all articles published in the four years before anglicizing and in the four years after anglicizing the same journal. Results reveal rather quick changes: Citations per year since original articles’ publication increase significantly, and the IF of the journals go up markedly. Frequencies of citing in German-language journals decrease, citing in English-language journals increase significantly after the Anglicization of former German-language psychology journals, and there is a general trend of increasing citations in other languages as well. Side effects of anglicizing former German-language psychology journals include the publication of shorter papers, their availability to a more international authorship, and a slight, but significant increase in multiple authorships.

Experimental study of thermohydraulic characteristics and irreversibility analysis of novel axial corrugated tube with spring tape inserts

2020 ◽  
Vol 92 (3) ◽  
pp. 30901
Author(s):  
Suvanjan Bhattacharyya ◽  
Debraj Sarkar ◽  
Ulavathi Shettar Mahabaleshwar ◽  
Manoj K. Soni ◽  
M. Mohanraj
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Thermal Performance ◽  
Working Fluid ◽  
The Novel ◽  
Heat Exchanger Tube ◽  
Heat Transfer Augmentation ◽  
Corrugated Tube ◽  
The Impact ◽  
Exchanger Tube

The current study experimentally investigates the heat transfer augmentation on the novel axial corrugated heat exchanger tube in which the spring tape is introduced. Air (Pr = 0.707) is used as a working fluid. In order to augment the thermohydraulic performance, a corrugated tube with inserts is offered. The experimental study is further extended by varying the important parameters like spring ratio (y = 1.5, 2.0, 2.5) and Reynolds number (Re = 10 000–52 000). The angular pitch between the two neighboring corrugations and the angle of the corrugation is kept constant through the experiments at β = 1200 and α = 600 respectively, while two different corrugations heights (h) are analyzed. While increasing the corrugation height and decreasing the spring ratio, the impact of the swirling effect improves the thermal performance of the system. The maximum thermal performance is obtained when the corrugation height is h = 0.2 and spring ratio y = 1.5. Eventually, correlations for predicting friction factor (f) and Nusselt number (Nu) are developed.

Sign in / Sign up

Export Citation Format

Share Document