Kinetic Testing and Sorption Studies by Modified Weathering Cells to Characterize the Potential to Generate Contaminated Neutral Drainage

2010 ◽  
Vol 30 (1) ◽  
pp. 22-37 ◽  
Author(s):  
B. Plante ◽  
M. Benzaazoua ◽  
B. Bussière
1995 ◽  
Vol 59 (2-3) ◽  
pp. 438
Author(s):  
D.M. Short ◽  
F.D.C. Manson ◽  
G.A. Reid ◽  
S.K. Chapman

2016 ◽  
Vol 5 (2) ◽  
pp. 5 ◽  
Author(s):  
Julia Grobbel ◽  
Janko Dietzsch ◽  
Chris A. Johnson ◽  
Reinhard Vonthein ◽  
Katarina Stingl ◽  
...  

2016 ◽  
Vol 52 (2) ◽  
pp. 117-126 ◽  
Author(s):  
Iuliana L. Calugaru ◽  
Carmen Mihaela Neculita ◽  
Thomas Genty ◽  
Bruno Bussière ◽  
Robin Potvin

Minerals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1306
Author(s):  
Youssef Toubri ◽  
Denys Vermette ◽  
Isabelle Demers ◽  
Nicholas Beier ◽  
Mostafa Benzaazoua

Weathering cell test, designed specifically to overcome material-limited constraints, yields prompt and efficient experimental assessment during the development stages of mining projects. However, it has barely benefited from geochemical modeling tools despite their ease of use. Accordingly, this paper aims to strengthen the upstream geochemical assessment via parametric analysis that simulates the effect of various mineral assemblages on leachate quality recovered from weathering cells. The main objective is to simulate the pH in presence of silicate neutralizing minerals and Mn release from carbonates based upon minimal characterization data. The public domain code PHREEQC was used for geochemical kinetic modeling of four weathering cells. The kinetic model utilized a water film concept to simulate diffusion of chemical elements from mineral surfaces to the pore water. The obtained results suggest that the presence of the silicate neutralizing minerals slightly affects the Mn release from carbonates. Furthermore, plagioclases could supply a significant neutralization potential when they predominate the mineral assemblage. Finally, coupling weathering cell test and parametric analyses illuminate the pH evolution for various mineral proportion scenarios.


Author(s):  
Максим Евгеньевич Григорьев ◽  
Роман Викторович Бровко ◽  
Евгений Олегович Долуда

В работе рассмотрена возможность использование ультразвука при получении рутений содержащей каталитической системы Ru/СПС MN 100. Проведено кинетическое тестирование данного катализатора и сравнение его активности с таким же катализатором, но синтезированным без использования ультразвука, в процессе гидрирования ксилозы и лактозы до соответствующих полиолов - ксилита и лактита. Процесс гидрирования осуществлялся в реакторе периодического и непрерывного действия при оптимальных условиях (температуре, концентрации моно- и дисахарида, парциальном давлении водорода, скорости подачи водного раствора ксилозы и лактозы и скорости подачи водорода). Установлено, что ультразвуковая обработка рутениевого катализатора способствует повышению его активности, что отражается на увеличении конверсии моно- и дисахарида при проведении процесса в периодических условиях, при этом практически не происходит изменения конверсии субстратов при их гидрировании в реакторе проточного типа. The paper considers the possibility of using ultrasound in the production of ruthenium-containing catalytic system Ru/SPS MN 100. Kinetic testing of this catalyst was carried out and its activity was compared with the same catalyst, but synthesized without the use of ultrasound, in the process of hydrogenation of xylose and lactose to the corresponding polyols - xylitol and lactite. The hydrogenation process was carried out in a periodic and continuous reactor under optimal conditions (temperature, concentration of mono - and disaccharide, partial pressure of hydrogen, the rate of supply of an aqueous solution of xylitol and lactite and the rate of supply of hydrogen). It was found that ultrasonic treatment of the ruthenium catalyst contributes to an increase in its activity, which is reflected in an increase in the conversion of mono - and disaccharide during the process under periodic conditions, while there is practically no change in the conversion of substrates during their hydrogenation in a flow-type reactor.


2017 ◽  
Vol 203 ◽  
pp. 899-909 ◽  
Author(s):  
Matteo Compagnoni ◽  
Antonio Tripodi ◽  
Ilenia Rossetti

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