scholarly journals Research of the process of obtaining potassium fertilizers from carnallite ore

2021 ◽  
Vol 102 (2) ◽  
pp. 77-85
Author(s):  
G.M. Seitmagzimova ◽  
◽  
A. Assylkhankyzy ◽  
I.A. Petropavlovsky ◽  
Zh.K. Dzhanmuldaeva ◽  
...  
Keyword(s):  
Nitric Acid ◽  
Potassium Sulfate ◽  
High Rate ◽  
Potassium Fertilizer ◽  
Foreign Markets ◽  
Kinetic Region ◽  
The Moment ◽  
Filtration Properties ◽  
Reaction Activation Energy ◽  
Kinetics Of

To providedomestic and foreign markets with potash fertilizers Kazakhstan has begun to create own production of these products. But at the moment enterprises engaged in mining potash salts did not reach a practical stage. The Chelkarcarnallite ore deposit is auniqueone in solving these urgent problems. The article presents results of the study of processing Chelkar potash ore washed from sodium chloride to obtain a potassium fertilizer containing potassium and magnesium sulfates. The kinetics of nitric acid decomposition of carnallite ore has been investigated. The calculated value of reaction activation energy of potassium sulfate and nitric acid inter-action characterizes the kinetic region of the process behavior.Optimal conditions for decomposition of washed calcined ore with 30%nitric acid solution at 50°C were determined. It has been found that to ensure better filtration properties and high rate of suspension separation, washed non-calcined ore should be used to exclude gypsum dehydration, which causes its phase conversion into anhydrite. The double salt of potassium-magne-sium sulfate was separated by crystallization from nitric acid extract and an ammoniated mother liquor drying allowed to obtain a salt, which is ballast-free chlorine-free complex nitrogen-potassium-magnesium fertilizer.

Modulating the kinetics of CoSe2 yolk-shell spheres via nitrogen doping with high pseudocapacitance toward ultra-high-rate and high-energy density sodium-ion half/full batteries

2021 ◽  
Author(s):  
Jitao Geng ◽  
Shiyu Zhang ◽  
Edison Huixiang Ang ◽  
Jia Guo ◽  
Zhihua Jin ◽  
...  
Keyword(s):  
Anode Materials ◽  
Nitrogen Doping ◽  
High Capacity ◽  
Cycling Performance ◽  
High Energy ◽  
Sodium Ion ◽  
High Rate ◽  
High Energy Density ◽  
The Moment ◽  
Kinetics Of

Developing advanced anode materials with high capacity, good rate and cycling performance for sodium-ion batteries still remains a major challenge at the moment. Herein, it is demonstrated that the introduction...

Kinetics of the Crystallization of Potassium Sulfate

1993 ◽  
Vol 58 (8) ◽  
pp. 1848-1854 ◽  
Author(s):  
Miroslav Karel ◽  
Jaroslav Nývlt
Keyword(s):  
Experimental Data ◽  
Crystal Growth ◽  
Growth Rates ◽  
Potassium Sulfate ◽  
Kinetics Of

The kinetics of the crystallization of potassium sulfate has been determined using the MSMPR technique. Values of the nucleation and crystal growth rates evaluated from the experimental data are compared with the corresponding literature data.

scholarly journals Enhanced Adsorption of Methanol by Oxidised Nutshell Carbon

2000 ◽  
Vol 18 (3) ◽  
pp. 261-266 ◽  
Author(s):  
Alan Bailey ◽  
Mike Williams ◽  
Lyndsay Dunne ◽  
Lynne Beames
Keyword(s):  
Nitric Acid ◽  
Water Adsorption ◽  
Opposite Effect ◽  
Kinetics Of Adsorption ◽  
Dry Air ◽  
Low Concentrations ◽  
Methanol Vapour ◽  
Adsorption Reduction ◽  
Enhanced Adsorption ◽  
Kinetics Of

A nutshell charcoal was oxidised and reduced and the effect of the treatments on the water adsorption isotherms and methanol vapour penetration noted. Oxidation with 6 M nitric acid increased the penetration times for methanol vapour in dry air, not by just raising the dynamic capacity at low concentrations but also by improving the kinetics of adsorption. Reduction caused the opposite effect. The improvement in the adsorption kinetics is thought to be due to surface diffusion on to the oxidised surface of the transport pores.

High-rate capability of Na2FePO4F nanoparticles by enhancing surface carbon functionality for Na-ion batteries

2017 ◽  
Vol 5 (35) ◽  
pp. 18707-18715 ◽  
Author(s):  
Jesse S. Ko ◽  
Vicky V. T. Doan-Nguyen ◽  
Hyung-Seok Kim ◽  
Xavier Petrissans ◽  
Ryan H. DeBlock ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Rate Capability ◽  
High Rate ◽  
Charge Storage ◽  
High Rate Capability ◽  
Surface Carbon ◽  
Reduced Graphene ◽  
Kinetics Of

Na-ion charge-storage kinetics of polyol-derived Na2FePO4F are enhanced by using a nanocomposite comprising nanoparticles and reduced graphene oxide.

Growth Kinetics of ZnS Thin Films from a High-Rate Chemical Bath Deposition with Trisodium-Nitrilotriacetate Complexing

2018 ◽  
Vol 7 (11) ◽  
pp. P615-P623
Author(s):  
Dick Chiu ◽  
Yujuan He ◽  
Zhongwei Gao ◽  
Cassandra Remple ◽  
Chih-Hung Chang
Keyword(s):  
Thin Films ◽  
Chemical Bath Deposition ◽  
Growth Kinetics ◽  
High Rate ◽  
Kinetics Of

scholarly journals A NOTE ON THE FORWARD AND THE EQUITY PREMIUM PUZZLES: TWO SYMPTOMS OF THE SAME ILLNESS?

2013 ◽  
Vol 19 (2) ◽  
pp. 446-464 ◽  
Author(s):  
Carlos E. da Costa ◽  
João V. Issler ◽  
Paulo F. Matos
Keyword(s):  
Euler Equations ◽  
Equity Premium ◽  
Financial Data ◽  
Stochastic Discount Factor ◽  
Foreign Markets ◽  
Forward Premium Puzzle ◽  
Forward Premium ◽  
Premium Puzzle ◽  
The Moment ◽  
Moment Restrictions

We build a stochastic discount factor—SDF—using U.S. domestic financial data only, and provide evidence that it accounts for stylized facts about foreign markets that escape SDFs generated by consumption-based models. When our SDF is interpreted as the projection of the pricing kernel from a fully specified model in the space of returns, our results indicate that a model that accounts for the behavior of domestic assets goes a long way toward accounting for the behavior of foreign asset prices. In our tests, we address predictability, a defining feature of the forward premium puzzle—FPP—by using instruments that are known to forecast excess returns in the moment restrictions associated with Euler equations both in the equity and in the foreign markets.

Study on Kinetics of Reaction between ZrNi5 and Water Vapor

2012 ◽  
Vol 581-582 ◽  
pp. 694-697
Author(s):  
Yong Yao ◽  
De Li Luo ◽  
Zhi Yong Huang ◽  
Jiang Feng Song
Keyword(s):  
Water Vapor ◽  
Reaction Rate ◽  
Arrhenius Equation ◽  
Tritiated Water ◽  
First Order ◽  
Order Chemical Reaction ◽  
First Order Chemical Reaction ◽  
Kinetics Of Reaction ◽  
Reaction Activation Energy ◽  
Kinetics Of

In order to evaluate the feasibility of tritium recovery from tritiated water by thermochemical decomposition using ZrNi5, the kinetics of reaction between ZrNi5 and water vapor was studied by thermogravimetric method in the temperature range from 673K to 823K. The result shows that reaction rate increased significantly with the increasing of temperature and H2O concentration; the reaction mechanism for ZrNi5 can be described by the first-order chemical reaction, and the reaction is first order for H2O concentration. The reaction activation energy of ZrNi5 is 55.8kJ/mol calculated from the Arrhenius equation.

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