scholarly journals RESEARCH OF THE INFLUENCE OF BIOCECK QUALITY ON SORPTION LEACHING INDICATORS

2021 ◽  
Vol 86 (5-2) ◽  
Author(s):  
Nurmurod Khujakulov ◽  
Ulugbek Ruziev ◽  
Nigora Nasirova
Keyword(s):  
Sorption Leaching

Impact of oiled and de-oiled olive mill waste amendments on the sorption, leaching, and persistence ofS-metolachlor in a calcareous clay soil

2013 ◽  
Vol 48 (9) ◽  
pp. 767-775 ◽  
Author(s):  
David Peña ◽  
Ángel Albarrán ◽  
Antonio López-Piñeiro ◽  
José Manuel Rato-Nunes ◽  
Javier Sánchez-Llerena ◽  
...  
Keyword(s):  
Clay Soil ◽  
Olive Mill Waste ◽  
Sorption Leaching ◽  
Mill Waste ◽  
Olive Mill

scholarly journals Imazapic interaction and mobility in soil cultivated with sugarcane in northeast Brazil

RBRH ◽  
2021 ◽  
Vol 26 ◽  
Author(s):  
Fernando Xavier de Assis ◽  
André Maciel Netto ◽  
Bruno Toríbio de Lima Xavier ◽  
Valmir Felix de Lima ◽  
João Paulo Siqueira da Silva
Keyword(s):  
Partition Coefficients ◽  
Biological Effects ◽  
Clay Content ◽  
Breakthrough Curves ◽  
Northeastern Brazil ◽  
Adsorption Potential ◽  
Soil Columns ◽  
Leaching Potential ◽  
Physical Chemical ◽  
Sorption Leaching

ABSTRACT In the plantation of sugarcane, Imazapic has used pre- or post-emergence, alone or in combination with other herbicides. When applied to the soil in pre-emergence, Imazapic can undergo the sorption, leaching and/or degradation processes due to physical, chemical and biological effects, besides being absorbed by weeds. The objective of this work was to evaluate the interaction and mobility of the Imazapic herbicide in the soil where the soil columns with a dystrophic Yellow Ultisol (YUd) and a dystrophic Red-Yellow Oxisol (RYOd) from northeastern Brazil were used. The higher adsorption potential of the RYOd is associated with higher clay content, higher Fed and Feo concentrations, and soil acidic pH. The CDE – 2 sorption sites model adequately represented the experimental data from the Imazapic breakthrough curves to the RYOd and YUd soils. From the Kd partition coefficients for RYOd and YUd, high values of the GUS index (5.94 and 7.04, respectively) were calculated, confirming the high leaching potential of the Imazapic molecule in these soils.

Basic Concepts of Modeling Pesticide Fate in the Crop Root Zone

Weed Science ◽  
1985 ◽  
Vol 33 (S2) ◽  
pp. 25-32 ◽  
Author(s):  
R. J. Wagenet ◽  
P.S.C. Rao
Keyword(s):  
Environmental Fate ◽  
Root Zone ◽  
Effective Means ◽  
Simulation Models ◽  
Cost Effective ◽  
Natural Processes ◽  
Modeling Approach ◽  
Efficacy Trials ◽  
Sorption Leaching ◽  
Crop Root

Modeling is increasingly being used as a tool for the evaluation of the environmental fate of pesticides. Sorption, leaching, degradation, and volatilization are some of the processes being integrated through the use of simulation modeling techniques. Several research programs are focusing their attention on such issues (16, 17, 18, 32, 35), with regulatory agencies involved in management of pesticides also taking a modeling approach (3, 7). Because of the extreme complexity of agroecosystems, it is obvious that the use of simulation models will continue to be the most expeditious, reliable, and cost-effective means of integrating the various processes acting upon a pesticide to determine its fate. For example, modeling will help to summarize and interpret efficacy trials and will provide the vehicle for transferring experimental results to unstudied situations, such as the potential environmental fate of an applied herbicide. However, proper development, testing, and responsible use of a modeling approach must be based upon a thorough, comprehensive understanding of interdependent and dynamic natural processes.

Development of a combined processing technology for low-sulfide gold-bearing ores

2021 ◽  
pp. 3-8
Author(s):  
A. K. Koyzhanova ◽  
B. K. Kenzhaliev ◽  
D. R. Magomedov ◽  
N. N. Abdyldaev
Keyword(s):  
Raw Materials ◽  
Gold Recovery ◽  
Gold Content ◽  
Ministry Of Education ◽  
Gravity Concentration ◽  
Laboratory Equipment ◽  
Sorption Leaching ◽  
The Republic ◽  
Processing Circuit ◽  
Gold Bearing

This paper presents the results of laboratory dressability studies for low-sulfide gold-bearing ores using combined processing and subsequent oxidation leaching of the resulting combined concentrate. According to the current raw materials processing circuit used at the Sekisovskoye deposit, gravity concentration experiments were first carried out using the following laboratory equipment: a Knelson KSMD 3 centrifugal concentrator, an SKO-05 concentration table, and a two-chamber diaphragm jigging machine (i.e., OML by TsNIGRI). A significant portion (0.5 to 1.0 g/t) of the gold remains in the gravity concentration tailings. Subsequent flotation experiments for the tailings suggest that additional gold recovery is possible. The gold content in the final flotation tailings was in the range of 0.15–0.25 g/t. The final gold recovery in the combined process was therefore 93.7–96.5 %. The subsequent sorption cyanidation of the concentrate according to the current processing circuit allows depositing an average of 75.0–80.0 % Au on the coal. At the same time, the residual gold content in the sorption leaching tailings is significant and amounts to 3.6–7.5 g/t. The preliminary oxidation experiments for the concentrate slurry indicate the possibility of a more complete gold recovery with subsequent leaching, including sorption leaching. The residual gold content in the cakes was measured at 0.7–1.5 g/t, which ultimately yielded 95–96 % recovery at the leaching stage. The research was completed with the financial support of the Science Committee of the Ministry of Education and Science of the Republic of Kazakhstan under grant No. АР05130143.

Sorption, leaching and persistence of metribuzin in Mediterranean soils amended with olive mill waste of different degrees of organic matter maturity

2013 ◽  
Vol 122 ◽  
pp. 76-84 ◽  
Author(s):  
Antonio López-Piñeiro ◽  
David Peña ◽  
Angel Albarrán ◽  
Daniel Becerra ◽  
Javier Sánchez-Llerena
Keyword(s):  
Organic Matter ◽  
Olive Mill Waste ◽  
Sorption Leaching ◽  
Mediterranean Soils ◽  
Mill Waste ◽  
Olive Mill

scholarly journals Studies of the rate of gold sorption by the AM-2B anionite from cyanide-alkaline solutions

2022 ◽  
Vol 320 (1) ◽  
pp. 88-94
Author(s):  
D.S. Kaumetova ◽  
◽  
A.K. Koizhanova ◽  
Kh.K. Absalyamov ◽  
D.R. Magomedov ◽  
...  
Keyword(s):  
Sorption Process ◽  
Alkaline Solutions ◽  
Sorption Rate ◽  
Alkali Solutions ◽  
Dimethyl Ammonium ◽  
Temperature Dependences ◽  
Sorption Leaching ◽  
Quantitative Separation ◽  
New Generation ◽  
Physical And Chemical

The paper presents the results of studies on the sorption leaching of gold-containing ore of the Vasilkovskoye deposit. Kinetic dependences of the sorption of gold and associated metals from cyanide-alkali solutions under different physical and chemical factors were obtained. It was found that gold on the AM-2B resin sorbed at a higher rate than, for example, copper and zinc. The solutions were analyzed using modern devices of a new generation: FT-IR spectrometer "Avatar 370". Laboratory studies were performed to determine the gold sorption rate by the AM-2B anionite from cyanide-alkaline solutions. It was found in the process of sorption of gold from multicomponent cyanide-alkali solutions on AM-2B anionite of mixed basicity, with the macroporous structure containing benzyl dimethylamine and dibenzyl dimethyl ammonium functional groups, that an important factor of qualitative and quantitative separation of gold and impurity metals is the concentration of cyanide and hydroxyl ions in solution. The temperature effect on the sorption rate of gold from cyanide-alkali solutions was studied with the temperature dependences F of t, Bt, of t, ln (l - F) of t, and D of t that show that the sorption process of dicyanoaurate ions is controlled by mixed diffusion.

Sorption-Leaching Unification of Uranium Ore Pulp Processing

Atomic Energy ◽  
2019 ◽  
Vol 126 (4) ◽  
pp. 235-241
Author(s):  
T. V. Molchanova ◽  
K. M. Smirnov ◽  
O. K. Krylova
Keyword(s):  
Uranium Ore ◽  
Sorption Leaching ◽  
Pulp Processing
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