scholarly journals Refining of high-phosphorus manganese alloys, which are formed during electrometallurgical Dephosphoration of manganese ore

2019 ◽  
pp. 43-53
Author(s):  
Myanovska Ya ◽  
Mishalkin A ◽  
Kamkina L ◽  
Du Yunsheng Du ◽  
Isaeva Lydmila ◽  
...  
Keyword(s):  
Computer Modeling ◽  
Experimental Studies ◽  
Refining Process ◽  
Manganese Ore ◽  
Manganese Alloy ◽  
The Real ◽  
Manganese Alloys ◽  
Real Process ◽  
Low Phosphorus ◽  
Kinetics Of

Goal. Creation of the most rational way of dephosphorization of manganese alloys. Method. Thermodynamic calculations to establish the preference of the reactions during dephosphorization. Computer modeling of the influence of the charge composition on the process of reducing the phosphorus content. Experimental studies in the laboratory during a two-stage processing of high phosphorus metal. Results. The results of computer modeling and experimental study of the refining process of manganese alloy with high content of silicon and phosphorus indicate the feasibility of using the experimental slag-forming mixture based on Na4SiO4. Comparisons of the calculated data with the results of experimental melting show that there are differences in their values. These differences are due to the fact that in real conditions the thermo-dynamic forecast does not always coincide with the kinetics of the real process. The obtained experimental data indicate that the analyzed system achieves a state of dynamic equilibrium in contrast to the data of thermodynamic calculations by the program, which does not take into account the kinetics of the real process and the assumptions made in the simulation. Scientific novelty. The results of experimental studies have shown that the adopted physico-chemical features of the one-stage method of refining the alloy from silicon and phosphorus at a temperature of ~ 1350oC, provide protection of manganese from oxidation with the use of Na4SiO4. Practical significance. Therefore, it is advisable to implement the developed scheme of dephosphorization of the accompanying manganese alloy, which is formed during the production of low phosphorus slag, in industrial conditions. Given that the limiting link in the refining process is the oxidation reaction of the phosphorus alloy due to the interaction with Fe2O3, it is advisable to use forced mixing of the metal and the alloy by purging with neutral gas. Key words: phosphorus, manganese ore, concomitant manganese alloy, low phosphorus slag, dephosphorization,

scholarly journals Refining of manganese alloys with high content of phosphorus obtained in electrometallurgical dephosphoration of manganese ores

2019 ◽  
pp. 19
Author(s):  
Velichko Olekssandr ◽  
Myanovska Ya ◽  
Karbovnichek M ◽  
Du Yunshen Du ◽  
Mishalkin A ◽  
...  
Keyword(s):  
Manganese Content ◽  
Refining Process ◽  
Raw Material ◽  
Manganese Alloy ◽  
Environmental Friendliness ◽  
Low Phosphorus ◽  
Refining Time ◽  
The Cost ◽  
Iron Scale ◽  
Sodium Orthosilicate

The expediency of carrying out the process of dephosphorization of the alloy in one stage using a briquetted mixture, which includes iron scale, lime, bauxite and sodium orthosilicate in their following ratio, wt.%: Iron scale - 52.0… 57.4; lime - 6.2… 8.6; bauxite - 4.5… 6.2; sodium orthosilicate - 30.5… 30.4. The achieved degree of dephosphorization of the accompanying manganese alloy is about 70%, the manganese content in the alloy - 64.6%. The implementation of dephosphorization according to the developed method allowed to increase the rate of throughput of manganese from the raw material. Exclusion from the composition of materials for dephosphorization of fluoride compounds increases the environmental friendliness of the refining process. In the real conditions of production in the process of depho-?phorization of the associated alloy may use different processing schemes and conditions of its implementation. In the formation of a concomitant alloy with a temperature of ~ 1300oC in the production of low-phosphorus slag, in order to minimize the cost of dephosphorization of the alloy using existing shop equipment, the refining process can be implemented according to the following scheme and purging the bath with argon, the dephosphorization process scheme may include the following operations: adding 100% pre-briquetted SHUS, to the bottom of the bucket, trans-?orting the bucket to the installation of the oven-bucket, where the optimum temperature will be maintained during refining. This will increase the refining time and, consequently, greater completeness of the refining process .: Key words: highly phosphorous concomitant alloy, slag-forming mixture, ladle furnace, completeness of depho-?phorization.

Experimental Studies of Sedimentation Basin Dynamics

1977 ◽  
Vol 12 (1) ◽  
pp. 77-90
Author(s):  
J.F. Cordoba-Molina ◽  
P.L. Silveston ◽  
R. R. Hudgins
Keyword(s):  
Dynamic Response ◽  
Froude Number ◽  
Flow Model ◽  
Experimental Studies ◽  
Densimetric Froude Number ◽  
Number Range ◽  
The Real ◽  
Highly Correlated ◽  
Sedimentation Basins ◽  
Simple Flow

Abstract A simple Flow Model is proposed to describe the dynamic response of sedimentation basins. The response predicted by this model is linear as opposed to the real response of the basin which is nonlinear. However, the real response of the basin is highly correlated with its densimetric Froude number, and as a consequence our linear model effectively predicts the response of the basin in a restricted densimetric Froude Number range. Our experiments show that the response of the basin becomes more sluggish and erratic as the densimetric Froude number decreases.

Kinetics of hypso anhydrites dissolution in water. Experimental studies

2019 ◽  
pp. 93-96
Author(s):  
A. L. Lebedev ◽  
I. V. Avilina
Keyword(s):  
Experimental Data ◽  
Experimental Study ◽  
Riccati Equation ◽  
Balance Equation ◽  
Experimental Studies ◽  
Common Ion ◽  
The Common ◽  
Common Ion Effect ◽  
Kinetics Of Dissolution ◽  
Kinetics Of

Experimental study of kinetics of dissolution of hypso anhydrites at 25 ᵒC made it possible to formulate model of the process in the form of a balance equation for the kinetics of dissolution of gypsum, anhydrite (first and second orders, respectively) and kinetics of precipitation of gypsum (second order). The processing of the experimental data were carried out on the basis of the solution of the Riccati equation. When taking into account the common-ion effect on the solubility of gypsum and anhydrite, the calculated values turned out to be more comparable with the experimental ones.

Kinetics study of spreading processes of epoxy binders on carbon cloth surface with metal coating

2021 ◽  
Vol 0 (3) ◽  
pp. 34-38
Author(s):  
D.E. Grechushkina ◽  
◽  
V.A. Nelyub ◽  
Keyword(s):  
Considerable Increase ◽  
Experimental Studies ◽  
Copper Coating ◽  
Metal Coating ◽  
Carbon Cloth ◽  
Kinetics Study ◽  
Carbon Tape ◽  
Epoxy Binders ◽  
Kinetics Of ◽  
Spreading Processes

The results of experimental studies of kinetics of spreading processes of epoxy binders on the surface of a carbon (cloth) tape depending on a reinforcement pattern are presented. A copper coating of 100 nm thickness was deposited on reinforced materials by magnetron sputtering. It has been found out that a metal coating on the surface of a carbon tape and cloth leads to a considerable increase in the rate of spreading processes only for the laying-out pattern 0°, when binder movement in capillaries is provided. The deposition of a copper coating on the surface of the carbon tape and cloth has considerably the bigger influence on kinetics of the spreading processes, increasing it by 35%.

Cooling of Fruit with Arbitrary Shape: Simulation Using Galerkin-Based Integral Method

2017 ◽  
Vol 10 ◽  
pp. 1-15
Author(s):  
P. Morais Pessôa ◽  
A.G. Barbosa de Lima ◽  
R. Swarnakar ◽  
J.P. Gomes ◽  
W.M.P. Barbosa de Lima
Keyword(s):  
Integral Method ◽  
Arbitrary Shape ◽  
Heat Conduction Equation ◽  
Low Cost ◽  
Experimental Studies ◽  
Volume Ratio ◽  
Transient Heat Conduction ◽  
Cooling Time ◽  
Time Required ◽  
Kinetics Of

Cooling has been used for the preservation of fresh produce such as fruit and vegetables due to its low cost and high effectiveness in maintaining the product quality. Recently, several researchers have conducted theoretical and experimental studies for obtaining the kinetics of cooling and cooling time for fruits with different geometries. Present work, therefore, aims to simulate the cooling of fruits with particular reference to banana, orange, strawberry and Tahiti lemon. The transient heat conduction equation and its analytical solution using Galerkin based integral method are presented. It has been found that the strawberry has lower dimensionless cooling time compared with time required to cool other fruits, which is due to its higher surface area/volume ratio value. In orange and lemon the temperature distribution was found to be homogeneous in the angular direction, while in banana and strawberry it was two-dimensional due to shape of the fruits.

scholarly journals Molecular System Bioenergics of the Heart: Experimental Studies of Metabolic Compartmentation and Energy Fluxes versus Computer Modeling

2011 ◽  
Vol 12 (12) ◽  
pp. 9296-9331 ◽  
Author(s):  
Mayis Aliev ◽  
Rita Guzun ◽  
Minna Karu-Varikmaa ◽  
Tuuli Kaambre ◽  
Theo Wallimann ◽  
...  
Keyword(s):  
Computer Modeling ◽  
Molecular System ◽  
Experimental Studies ◽  
Energy Fluxes ◽  
Metabolic Compartmentation

Application of Galvanic Zinc-Iron Coating in the Repair of Transport and Technological Machines

2021 ◽  
Vol 1022 ◽  
pp. 181-193
Author(s):  
Dmitry M. Rozhkov ◽  
Evgenia V. Eltoshkina ◽  
Petr I. Ilyin ◽  
Olga A. Svirbutovich
Keyword(s):  
Experimental Studies ◽  
Iron Alloy ◽  
Resource Saving ◽  
Experimental Base ◽  
Optimal Resource ◽  
Iron Coating ◽  
Saving Mode ◽  
Relationship Of ◽  
The Relationship ◽  
Kinetics Of

The article presents the results of experimental studies to determine the relationship between the electrolysis modes and the properties of electroplating coatings for mathematical modeling of the dynamics of the electrolytic process (MDEP), described by a system of ordinary differential equations due to the complex relationship of the kinetics of chemical reactions, hydrodynamics and mass transfer in the electrolyte flow, the kinematics of electrode plates, and the influence of the electric field of the "anode-cathode" pair on all these processes. At the same time, the experimental base was a series of full-scale experiments to restore the seats of the root supports of cylinder blocks with electroplated coatings. The final result of the research is the procedure for constructing an optimal resource-saving mode of electroplating, which is a zinc-iron alloy.

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