scholarly journals Application of Magnetic and Ultrasonic Methods for Determining Parameters of Ferromagnetic Components in Iron Ore Slurry Flows

2021 ◽  
Vol 15 (4) ◽  
pp. 193-200
Author(s):  
Vladimir Morkun ◽  
Natalia Morkun ◽  
Vitaliy Tron ◽  
Olga Porkuian ◽  
Oleksandra Serdiuk ◽  
...  
Keyword(s):  
Iron Ore ◽  
Magnetic Measurements ◽  
Slurry Flow ◽  
Factors Affecting ◽  
Ultrasonic Methods ◽  
Ferromagnetic Component ◽  
Accuracy Of Measurements ◽  
Slurry Flows ◽  
Component Content ◽  
Operative Control

Abstract The article considers the method for controlling the ferromagnetic component content in slurry flow by ultrasonic and magnetic measurements. One of the basic factors determining the efficiency of magnetic separators at iron ore concentration plants is the quality of distribution of the ground ore into the product containing the ferromagnetic component and the waste rock. Due to the fact that in most cases, magnetic separators extract minerals with strongly magnetic properties, it is essential to find the magnetic component content in the input ore and products of its distribution in order to improve control over the technological process. Currently, low accuracy and reliability make existing means of operative control over the ferromagnetic component content in the slurry flow inefficient. Density of slurry is one of the primary disturbing factors affecting the accuracy of measurements, and this fact determines the necessity of measuring this parameter while controlling the ferromagnetic component content. Combined methods of measurements are a promising trend in designing sensors of useful component content in the slurry flow. The article describes the method for controlling the ferromagnetic component content in slurry flow by ultrasonic and magnetic measurements.

The Synthesis of Ce-Filled CoSb3 and Characterization of its Magnetic and Structural Properties

2003 ◽  
Vol 793 ◽  
Author(s):  
Arwyn L. E. Smalley ◽  
Brandon Howe ◽  
David C. Johnson
Keyword(s):  
Low Temperatures ◽  
Magnetic Measurements ◽  
Rietveld Analysis ◽  
X Ray Diffraction ◽  
Electrical Measurements ◽  
X Ray ◽  
Ferromagnetic Component ◽  
Phase Pure ◽  
Powder Samples

ABSTRACTA series of cerium-containing CoSb3 samples were synthesized, with cerium quantities varying from 0 to 2 stoichiometric equivalents. These samples were annealed at low temperatures to crystallize the kinetically stable phases CexCo4Sb12 (x = 0–0.5). X-ray diffraction showed that these samples were phase pure, and Rietveld analysis on x-ray diffraction data from powder samples indicated that these samples were 25–88% crystalline. Electrical measurements showed that these samples are n-type, which was previously unknown in CexCo4Sb12. Magnetic measurements showed that the samples were paramagnetic due to the cerium being incorporated into the diamagnetic CoSb3 compound. In addition, they contained a ferromagnetic component that was attributed to the amorphous, cerium-containing phase.

Effect of Pipe Inclination on Settling Slurry Flow Near Deposition Velocity

2018 ◽  
Author(s):  
Václav Matoušek ◽  
Mikoláš Kesely ◽  
Jiři Konfršt ◽  
Pavel Vlasák
Keyword(s):  
Deposition Velocity ◽  
Experimental Results ◽  
Engineering Practice ◽  
Local Concentration ◽  
Slurry Flow ◽  
Layered Model ◽  
Frictional Pressure Drop ◽  
Model Predictions ◽  
Slurry Flows ◽  
Pipe Inclination

Inclined slurry flows occur often in industrial applications such as mining and dredging. Pipelines transporting slurries contain inclined sections of various lengths and slopes. If the transported slurry is settling slurry then pipe inclination considerably affects flow structure and behavior. We discuss settling slurry flow near and at the deposition limit at which stationary deposit starts to be formed at the bottom of the pipe. In particular, we focus on the effect of the pipe slope on the deposition velocity, and on the solids distribution and manometric hydraulic gradient in flow round the deposition limit. We introduce our new layered model for inclined settling slurry flows and demonstrate its predictive capabilities. Model predictions are verified by our experiment in a laboratory loop. We also introduce our new experimental approach to a detection of the deposition velocity based on radiometric sensing of the change of local concentration of solids at the bottom of a pipe. Our experiments cover a broad range of flow slopes and contain measurements of solids distribution in a pipe cross section. Experimental results show that the degree of flow stratification and frictional pressure drop decrease with the increasing angle of inclination in the ascending pipe while the opposite applies in the descending pipe, which affects the deposition velocity and other related flow parameters. A comparison with model predictions demonstrates that experimentally observed effects of pipe inclination are reproduced well by the layered model. Predicted deposition velocities, pressure drops and solids distributions are in a good agreement with the experimental results and indicate suitability of the model for engineering practice.

scholarly journals Test of Impact of Vibrations Frequency on Mean Errors of the Precise Height Differences Measurement with Analogue Automatic Leveller Ni002

2018 ◽  
Vol 28 (4) ◽  
pp. 129-137
Author(s):  
Marek Kurnatowski
Keyword(s):  
Research Station ◽  
Measurable Effect ◽  
Factors Affecting ◽  
Industrial Areas ◽  
Accuracy Of Measurements ◽  
Measurement Results

Abstract The article describes the results of tests carried out to determine the measurable effect of vibrations on the accuracy of measurements with an automatic precise leveller. It contains specification of the research station created to examine the case and description of factors affecting the measurement results. The multi-frequency vibrations were forced on a leveller during measurements and calculated mean errors for each frequency analysed. The range of frequencies for which the measurement was possible was estimated. The obtained results can be helpful in the engineering measurements designing, especially in industrial areas, where vibrations are an inseparable element of the environment.

scholarly journals Increasing efficiency of iron ore magnetic separation by using ultrasonic technologies

2021 ◽  
Vol 280 ◽  
pp. 08004
Author(s):  
Vladimir Morkun ◽  
Natalia Morkun ◽  
Vitalii Tron ◽  
Vladimir Golik ◽  
Arkadii Davidkovich
Keyword(s):  
Magnetic Separation ◽  
Iron Ore ◽  
Structural Parameters ◽  
High Energy ◽  
Material Surface ◽  
Technological Parameters ◽  
Magnetic Separator ◽  
Ultrasonic Methods ◽  
Dispersed Particles ◽  
Enhance Efficiency

The research is aimed at solving the topical problem of enhancing efficiency of iron ore magnetic separation by applying ultrasonic technologies to identify optimal technological parameters of magnetic separation, improving controlled structural parameters of a magnetic separator and pretreating slurry by highenergy ultrasound to clean the ore material surface from fine-dispersed particles of minerals and slime, as well as disintegrate ore aggregates fed to the magnetic separator. The main tasks involve identifying regularities of influence of slurry pretreatment by high-energy ultrasound on properties of iron ore magnetic separation, determining regulations of improving technological and controlled structural parameters of the magnetic separator using ultrasonic methods, developing and substantiating methods to enhance efficiency of iron ore magnetic separation by applying ultrasonic technologies.

A technology of production of a high-basic sinter in the agromeration workshop of Enakievo metallurgical plant and possible ways of its improvement

2020 ◽  
Vol 76 (8) ◽  
pp. 790-802
Author(s):  
I. M. Mischenko ◽  
Ya. Yu. Aslamova ◽  
N. S. Khlaponin ◽  
A. V. Kuzin ◽  
A. M. Kuznetsov ◽  
...  
Keyword(s):  
Metallurgical Plant ◽  
Iron Ore ◽  
Volume Density ◽  
Raw Material ◽  
Sintering Machine ◽  
Charge Layer ◽  
Metallurgical Wastes ◽  
In Series ◽  
Component Content ◽  
Enakievo Metallurgical Plant

During the last six years production of high-fluxed sinter at sinter workshop of Enakievo metallurgical plant is accomplished by using sinter charge, comprising almost equal shares of iron ore concentrate and metallurgical wastes. It is done because of insufficient and non-regular supplies of iron ore concentrates. The experience gained can be of some interest for specialists of sintering and BF production of other plants to ensure the operation under conditions of breach of iron ore raw material supply as well as utilization of wastes. An analytical and statistical evaluation of technical and economical indices of sintering accomplished, while component content, the charge basicity and technological conditions of it preparation and sintering variation. Results of industrial study of technological conditions and sinter production parameters presented while its basicity was varied within the range of 1.7–4.1 abs. units in some periods of 2019. Results of pilot-industrial experiments on production in the IVQ-2019 of several batches of rather strong sinter highlighted, while their basicity was varied in series from 2.0 to 5.0 abs. units. A method of adjusting of sintering speed of a high-basic charge along the width of sintering machine proposed, comprising a rational forming of the charge layer in the charging funnel and the layer profile with a concave parabola surface form along the sintering machine width. The method comprised also an increase of the charge volume density in the upper elemental layers and particularly – in the peripheral zones of general charge layer at the sintering machines pallets. Description of the charging complex on the sintering machine pallets was given. Scientific and practical recommendations elaborated for modernization the technology and technological equipment for the charge loading on the sintering machine.

scholarly journals METHOD OF DISCRETENESS SUBSTANTIATION OF QUALITATIVE CHARACTERISTICS TESTING DURING IRON ORE RAW MATERIALS EXTRACTION

2021 ◽  
Vol 2 (1) ◽  
pp. 3-10
Author(s):  
Volodymyr Azarian ◽  
Keyword(s):  
Iron Ore ◽  
Raw Materials ◽  
Quality Characteristics ◽  
Test Period ◽  
Valuable Component ◽  
Flow Formation ◽  
Technical Control ◽  
Component Content ◽  
Definition Of ◽  
Qualitative Characteristics

The article aims to substantiate the periodicity of the definition of the maintenance of a valuable component in faces. Information about the content of the valuable component is necessary to comply with the requirements of the enrichment complex while ensuring the process of the total cargo flow formation. Traditionally, in iron ore quarries, technical control services measure the content of the valuable component every shift, but the testing period requires determination. We aimed to justify the period of testing the quality characteristics of iron ore. To achieve the aim, we explored the quarry № 3 of the PJSC "ArcelorMittal Kryvyi Rih" Mining Department based on the provisions of the mining theory and using mathematical modelling and mathematical statistics methods. We developed a method of substantiating the period of testing the qualitative characteristics of the faces, which we checked based on data from the existing enterprise. Using our method, we proved the possibility of increasing the test period without losing the necessary information about the iron content and without reducing the quality characteristics of the formed final ore flow. Increasing the test period will help companies decrease costs by reducing the number of visits of technical control specialists to test the quarry face. The proposed technique can be helpful to any mining company that supports the data collection and maintain the statistical database of measurements of the valuable component content

scholarly journals COMPARATIVE ASSESSMENT OF EFFICIENCY ULTRASONIC AND SOUND METHODS OF ACTIVATION IRRIGATIONAL SOLUTION IN ROOT CHANNELS WITH SIMPLE AND DIFFICULT ANATOMY (PILOT STUDY)

2019 ◽  
Vol 15 (1) ◽  
pp. 57-62 ◽  
Author(s):  
Дина Сорокоумова ◽  
Dina Sorokoumova ◽  
Сергей Григорьев ◽  
Sergey Griroriev ◽  
Ксения Лаптева ◽  
...  
Keyword(s):  
Endodontic Treatment ◽  
Internal Wall ◽  
Ultrasonic Activation ◽  
Factors Affecting ◽  
Ultrasonic Methods ◽  
Combined Use ◽  
Medical Indications ◽  
Electronic Microscope ◽  
Root Channel

Background. The problem of increase in efficiency of endodontic treatment is relevant nowadays. Treat the decisive factors affecting quality of endodontic treatment: machining, irrigation and sealing of root channels. Machining of root channels does not allow to remove the greased layer. So an integral part of endodontic treatment is the irrigation of the root channel. Objectives ― to choose an optimum way of activation of irrigational solutions for removal of the greased layer in root channels with difficult anatomy. Methodology. The research of 30 intact painters removed on medical indications is conducted. Activation of irrigational solution was carried out by a sound the device EndoActivator and the ultrasonic IRRI K file on the device VDW.ULTRA. in root channels with simple and difficult anatomy. An object of a research was the internal wall of the root channel with the greased layer on the surface of dentine of the root. The research of samples was conducted by means of the scanning electronic microscope of JSM-6390LV. Results. When machining on an internal wall of root channels on the surface of dentine the greased layer is formed. Studying of samples with simple anatomy of root channels and activation of irrigational solutions revealed that the greased layer is removed throughout. When studying samples of teeth with difficult anatomy of root channels, it is determined, partially open dentinny a tubule at activation of solutions ultrasonic or sound by methods, and completely open dentin a tubule at activation of irrigational solution by the combined method. Conclusions. Carrying out activation of solutions in root channels with simple anatomy at a stage of a finishing irrigation is identical effectively as by ultrasonic, and sound methods. Application at a stage of a finishing irrigation of a sound method of activation in teeth with difficult anatomy of root channels allows to delete more than the greased layer, than ultrasonic activation. For the purpose of increase in efficiency of clarification of the root channel in teeth with difficult anatomy expediently combined use of sound and ultrasonic methods.

Feature-Scale Simulations of Particulate Slurry Flows in Chemical Mechanical Polishing by Smoothed Particle Hydrodynamics

2014 ◽  
Vol 16 (5) ◽  
pp. 1389-1418 ◽  
Author(s):  
Dong Wang ◽  
Sihong Shao ◽  
Changhao Yan ◽  
Wei Cai ◽  
Xuan Zeng
Keyword(s):  
Smoothed Particle Hydrodynamics ◽  
Chemical Mechanical Polishing ◽  
Removal Rate ◽  
Mechanical Polishing ◽  
Slurry Flow ◽  
Sph Method ◽  
Particle Hydrodynamics ◽  
Slurry Flows ◽  
Smoothed Particle ◽  
Feature Scale

AbstractIn this paper, the mechanisms of material removal in chemical mechanical polishing (CMP) processes are investigated in detail by the smoothed particle hydrodynamics (SPH) method. The feature-scale behaviours of slurry flow, rough pad, wafer defects, moving solid boundaries, slurry-abrasive interactions, and abrasive collisions are modelled and simulated. Compared with previous work on CMP simulations, our simulations incorporate more realistic physical aspects of the CMP process, especially the effect of abrasive concentration in the slurry flows. The preliminary results on slurry flow in CMP provide microscopic insights on the experimental data of the relation between the removal rate and abrasive concentration and demonstrate that SPH is a suitable method for the research of CMP processes.

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