scholarly journals Optimization of agglomeration burdens by metallugical properties complex. Report 1. Optimization of agglomeration burdens by technological characteristics of sinter production

2018 ◽  
pp. 27-34 ◽  
Author(s):  
A. V. D’yakov ◽  
A. A. Odintsov ◽  
V. A. Kobelev ◽  
G. A. Nechkin
Keyword(s):  
Iron Ore ◽  
Raw Materials ◽  
Partial Replacement ◽  
Specific Productivity ◽  
Metallurgical Properties ◽  
Agglomeration Process ◽  
Component Content ◽  
Ore Burden ◽  
Production Areas

Despite a lot of studies of iron ore raw materials was carried out both in sinter and BF production areas, the matter of agglomeration burdens optimization is still actual. Laboratory studies on sintering of agglomeration burdens of different component content were carried out for optimization of iron ore burden content optimization, following by determination of technology characteristics and metallurgical properties complex.As a result of the studies an optimal component and size content of the agglomeration burden determined to provide improving of metallurgical properties complex of agglomeration burden. The studies carried out showed, that lime introducing into the concentrate flow before the burden department can lead to sintering machines productivity increasing.The burden wetness range determined, enabling for complete lime hydrating. It was shown, that a partial replacement of agglomeration ores in the burden by BOF nickel slag contributes to agglomeration process specific productivity increasing as well as sinter strength increasing.

Development of the Process for Obtaining Iron-Ore Pellets with Required Metallurgical Properties

2019 ◽  
Vol 946 ◽  
pp. 450-455
Author(s):  
Boris Yur'ev ◽  
Vyacheslav Dudko
Keyword(s):  
Iron Ore ◽  
Raw Materials ◽  
Heating Rates ◽  
Blast Furnace Smelting ◽  
Metallurgical Properties ◽  
Ore Pellets ◽  
Oxidation Reduction ◽  
Strength Behavior ◽  
Fluxed Pellets ◽  
Furnace Smelting

We have studied the influence of oxidation-reduction reactions on the structure and strength behavior of the Kachkanar fluxed pellets both in their initial condition and during reduction. It has been discovered that at heating rates and temperatures found in industrial units the roasted pellets that are not oxidized to a full extent and are characterized by zonal structure do not meet the requirements imposed for the blast-furnace smelting raw materials. To develop a process that would ensure high metallurgical properties, we have analyzed the hematite dissociation reaction. It was found that the temperature and the content of slag-forming oxides influence this reaction. A sinter pot was used to carry out the research and determine metallurgical properties of partially dissociated pellets. The obtained results helped to develop a process to dissociate hematite at lower temperatures with calcium ferrosilicate melt. Such pellets are reduced at the temperatures of over 700оС, which prevents their destruction in blast furnaces.

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 DETERMINATION OF THE TRANSSHIPMENT CAPACITY OF THE RAILWAY STATION AND MEASURES TO ENSURE IT IN THE REQUIRED VOLUME BY INSTALLING TEMPORARY LOADING AND UNLOADING DEVICES

2021 ◽  
Vol 4 (1) ◽  
pp. 35-44
Author(s):  
S. Ugolkov ◽  
N. Mayorov
Keyword(s):  
Raw Materials ◽  
Practical Importance ◽  
Auxiliary Equipment ◽  
Mineral Extraction ◽  
Railway Station ◽  
Floor Level ◽  
Loading And Unloading ◽  
Bandar Abbas ◽  
Production Areas

in view of the fact that recently the economic cooperation between Russia and Iran in a number of production areas of the raw materials sector is expanding its program, the provision of mineral extraction with specialized and auxiliary equipment is being carried out. The paper deals with the organization of the delivery of cranes of Russian production on the automobile base of the type "Ivanovets" KS-6476 in the composition of 40 units to the objects of ore mining. Transportation of cranes by rail on the route: St. Petersburg (Russia)-Julfa (Azerbaijan) – Bandar Abbas (Iran) is justified. For transportation on the railways of Russia, the paper considers long-wheelbase platforms of model 13-491, on bogies of 1520 mm gauge. In order to comply with the dimensions on the railways of Iran, the transporters with a reduced floor level of the model 14-T116 on trolleys of 1435 mm gauge were selected. The reloading of equipment is planned to be carried out at the Julfa railway station of the Azerbaijan Railway. The results of the research, in our opinion, are certainly of practical importance for the transport industry, as the developed and proposed designs of loading and unloading devices allow for the reloading of equipment without the use of crane equipment using always available stocks of materials at cargo stations.

scholarly journals Optimization of the Process of Unloading of Iron Ore Raw Materials: The Case of a Steel Plant

2020 ◽  
Vol 18 (3) ◽  
pp. 148-162
Author(s):  
A. T. Popov ◽  
O. A. Suslova ◽  
E. A. Voronkova
Keyword(s):  
Metallurgical Plant ◽  
Iron Ore ◽  
Raw Materials ◽  
Stable Operation ◽  
Sinter Production ◽  
Metallurgical Production ◽  
Agglomeration Process ◽  
Initial Iron ◽  
Long Time ◽  
Main Production

The process of unloading iron ore raw materials of the metallurgical plant to the sinter plant has not been considered for a long time as a particular topic. Over the last years the conditions of metallurgical production have undergone certain changes: its intensification has occurred, which entails the need to re-evaluate parameters of stable operation of sinter production. The objective of the suggested study is to consider the issues of possible technical and technological improvement harmonizing transport flows with the requirements of the main production process. To achieve this goal, a technique of mathematical modelling is used, based on the mathematical apparatus of linear programming; graphic-analytical method; method of probability theory.The issues of the process of unloading, storage of iron ore raw materials, of their preparation for sinter production are primarily considered.The article presents the main positions of the process of optimizing unloading of sinter batch of a metallurgical plant.The general characteristics of the technology of metallurgical production and of each particular process are described. The agglomeration process is considered in more detail. The tables of initial iron ore raw materials for sintering production for certain reporting periods are given, for the sake of clarity, the data of one of the tables are summarized in a diagram. A diagram of a standard trestle-type ore warehouse is considered, which sequentially shows the main processes of sintering production from supply of raw materials to the car dumper to getting through a belt conveyor into a stack, and then into receiving bins. The article also provides an example of formation of piles of iron ore raw materials using manganese limestone.The study is based on a dynamic transport problem with delays (DTPD), which considers time of transportation of goods, the dynamics of production volumes over time, the dynamics of consumption, the dynamics of stocks of suppliers and consumers, dynamics of cost of transportation and storage, dynamics of cost of consumption losses. The study contains several mono-problems with a mono load, which overlap each other, forming a multiplicative overlay of single-product problems.

scholarly journals Estimation of application efficiency of “Flumag M” magnesia flux in agglomeration and BF production.

2019 ◽  
Vol 75 (1) ◽  
pp. 26-31
Author(s):  
V. I. Nosenko ◽  
A. N. Filatov ◽  
G. A. Nechkin ◽  
V. A. Kobelev
Keyword(s):  
Iron Ore ◽  
Raw Materials ◽  
Specific Productivity ◽  
Sintering Process ◽  
Sinter Production ◽  
Application Efficiency ◽  
Iron Ore Sinter ◽  
Magnesia Content ◽  
Bof Slag ◽  
Bf Slag

To decrease viscosity of BF slag and improve its desulfurization ability during hot metal production a magnesia oxide is used, which is introduced into a blast furnace, as a rule, within iron ore sinter, as well as in the form of a fluxing additive. Dolomite, sometimes iron ore materials with increased magnesia content (for example, Kovdor concentrate, raw or roasted Bakal siderite) as well as magnesia-contained wastes, most often BOF slag, are usually used as a main source of magnesia oxide during iron ore sinter production. Brucite, which is widely used abroad, mainly in Japan during iron ore sinter production, is a very prospective magnesia flux. However, brucite was never used in sinter production in Russia. Main parameters and efficiency of its application were obtained under Japan raw materials conditions. However sinter chemical and mineral compositions at Russian and Japanese sinter plants considerably differ. In this connection studies on influence of the magnesia flux “Flumag M”, which is identical by its composition to brucite, on the process parameters of sinter burden sintering and pellets production were carried out. The estimation of application efficiency of “Flumag M” magnesia flux was made during typical sintering of NLMK sinter burden. It was determined, that partial and complete substitution of dolomite by the “Flumag M” magnesia flux in the NLMK sinter burden results in an increase of specific productivity of sintering process by 10–20% (comparative) and the sinter strength by 3–5% (comparative) correspondently. Laboratory experiments on “Flumag M” magnesia flux application, carried out in STI NITU “MISiS”, showed, that raw pellets with magnesia flux additives have higher compressive strength comparing with the pellets having dolomite additives. Impact strength and abrasion strength of roasted pellets is higher, comparing with those with dolomite. Optimal content of “Flumag M” flux in the pellets burden is 2%. The application of “Flumag M” magnesia flux enables to remove burden from the burden and increase strength of roasted pellets.

Methodical Basis of Investigation of Influence of the Iron Ore Materials and Coke Metallurgical Characteristics on the Blast Furnace Smelting Efficiency

2012 ◽  
Vol 602-604 ◽  
pp. 365-375 ◽  
Author(s):  
Andrey N. Dmitriev ◽  
Galina Yu. Vitkina ◽  
Yu.A. Chesnokov
Keyword(s):  
Blast Furnace ◽  
Laboratory Tests ◽  
Iron Ore ◽  
Analytical Study ◽  
Raw Materials ◽  
Blast Furnace Smelting ◽  
Metallurgical Properties ◽  
Methodical Basis ◽  
Definition Of ◽  
Furnace Smelting

A new method of the estimation of influence of the iron ore materials and coke metallurgical properties on the efficiency of blast furnace smelting is developed. It consists in the following stages: the laboratory tests with the definition of the iron ore materials and coke metallurgical properties; the analytical study of the influence of these characteristics on the efficiency of blast furnace smelting using by mathematical models; the experimental industrial and industrial tests. The developed methodological basis allows to obtain improved criteria for evaluating the metallurgical characteristics of the raw materials and to explain the mechanism of their effect on the reaction of the direct and indirect recovery in the blast furnace. Therefore it allows to formulate recommendations to improve the blast furnace smelting technology.

scholarly journals EXPERIMENTAL INVESTIGATION ON FOAM CONCRETE WITH PARTIAL REPLACEMENT OF FINE AGGREATE BY FLY ASH AND CEMENT BY ALCCOFINE

2020 ◽  
Vol 184 ◽  
pp. 01089
Author(s):  
Dr.G.V.V. SATYANARAYANA ◽  
G. PRAVEEN KUMAR
Keyword(s):  
Experimental Investigation ◽  
Fly Ash ◽  
Raw Materials ◽  
Partial Replacement ◽  
Fine Aggregate ◽  
Foam Concrete ◽  
Continuous Mining ◽  
Materials Used ◽  
Additive Materials

As we know that Foam concrete has been successfully used and it has gained popularity due to its lower density than normal concrete. Globally the construction activities are rapid and using huge amount of fine aggregate and cement. Due to continuous usage of large amount of sand and cement we are creating natural imbalance by CONTINUOUS mining of sand, lime etc., from natural resources, which causes many natural hazards and become threat to humans. As a responsible citizen of world everyone think to stop the usage of sand and cement in huge quantity for infrastructural activities. Fly ash is one alternative solution as a partial replacement of sand and cement with Alccofine. In this investigation we are replacing fine aggregate with fly ash and cement with Alccofine by usage of Using additive materials in foam concrete which provides not only workability, strength but also reduce overall cost. As reducing the quantity of sand and cement in foam concrete we conserve Green House effect and also other raw materials used for cement. Foam concrete produced with uniform distribution of air bubbles thoughout the mass of concrete. The density of foam concrete is a function of the volume of foam added to the slurry and the strength decreases as decrease in densities. This experimental investigation was designed for density of 800 kg/m3. This study was compiled in determination of workability, plastic density, water absorption and compressive strength of foam concrete. The test specimens has been casted and tested at the age of 7,14 and 28 days.

scholarly journals Geophysical methods for controlling the useful component content as the basis for the quality management system at mining and processing enterprises

2020 ◽  
Vol 29 (1) ◽  
pp. 3-15
Author(s):  
Albert А. Аzarian ◽  
Wolodymyr А. Аzarian
Keyword(s):  
Quality Control ◽  
Quality Management ◽  
Management System ◽  
Iron Ore ◽  
Quality Management System ◽  
Raw Materials ◽  
Geophysical Methods ◽  
Operational Quality ◽  
Processing Plants ◽  
Component Content

The article is devoted to substantiating the possibility of creating a common quality management system for iron ore plants based on geophysical methods of operational quality control for mineral raw materials. Due to the fall in prices on the world markets of iron ore raw materials, the financial and economic situation of the mining and processing enterprises in Ukraine has significantly worsened. Thus, the problem of effective control and quality management in mining has become of maximum importance. The availability of timely and reliable information about the content of the useful component will allow responding quickly, forming an integrated final ore cargo flow of the plant of exact quality required by the mining and concentration complex. The need to create a common quality management system is dictated by the fact that the iron ore has a heterogeneous distribution of the useful component content within the deposit, the extraction and transport equipment operates irregularly, resulting in ore cargo flows of various degrees of integration have significant amplitude and frequency oscillations, both by quality and quantity indicators. The instability of the useful component content in the ore cargo, which is aimed at enrichment, leads to a decrease in concentrate output, increase of losses in the tails, costs increase, decrease of the enterprise profit and decrease of its competitiveness. The mathematical model of ore cargo flow formation, which has a range of limitations on quality characteristics, is given. The structure and functional scheme of the quality management system of the mining and processing plant are substantiated. As a result of theoretical studies, the possibility of using radiometric and magnetometric methods for the operational quality control of the iron ore raw materials in the conditions of mining and processing plants by geophysical devices developed by the staff of the problem-branch laboratory of the Kryvyi Rih National University and Rudpromheofizyka LLC is substantiated. The basic technological characteristics of devices and systems are given, information on their introduction into production is provided. It is concluded that the researches carried out and the devices introduced on their basis have created objective prerequisites for substantiating the quality management system at mining and processing plants. The devices and operational control systems based on geophysical methods allow to cover all major stages of mining and processing, to receive timely and reliable information on the condition and dynamics of changes in the useful component content, to efficiently quality management at mining and processing plants, to increase the enterprises competitiveness and profitability.

scholarly journals Complex of methodologies and laboratory equipment for determination of coke and slags properties in smelting zone of blast furnace

2019 ◽  
Vol 75 (2) ◽  
pp. 182-188
Author(s):  
M. I. Stukov ◽  
A. Yu. Chernavin ◽  
V. A. Kobelev ◽  
D. A. Chernavin ◽  
K. P. Ivashinenko
Keyword(s):  
Blast Furnace ◽  
Iron Ore ◽  
Carbon Materials ◽  
Raw Materials ◽  
Softening Temperature ◽  
Slow Heating ◽  
Electric Resistance ◽  
Air Blast ◽  
Reduction Treatment

Information about character of burden materials behavior inside a blast furnace at its different horizons enables to increase control efficiency of BF heat running. The elaborated complex of methodologies for carbon materials and iron ore raw materials properties study enables to simulate their behavior at the horizon of iron ore materials reducing, in the viscoplastic zone, at the horizon of iron ore raw materials smelting and its interaction with coke filling. A vertical electric resistance shaft furnace with a tube carbon heater was used as a base equipment for simulation of burden behavior in the reduction zone and smelting zone, as well as for simulation of iron ore burden melt outflow through coke filling. Burden materials preparation to the experiment concluded in crushing of iron ore component followed by 3–5 mm fraction extraction and a mixing it with 3–5 mm fraction of brown coal semi-coke in relation 2:1 for further heating-reduction treatment. The heating-reduction treatment of the mixture charged in the electric furnace simulates the reducing zone and is carried out by a slow heating of the iron ore component and reducing agent mixture from 20 up to 980–1020 ºС. The methodology of determination of lump carbon materials combustibility in the highly heated air blast flow was developed for the complex of equipment based on the shaft electric resistance furnace and aimed at testing of burning process of carbon samples of technological fuels. The combustibility was determined under conditions of burnt sample heating in the temperature range from 500 up to 1500 °C with an accuracy of ±10 °С. The temperature of air blast flow (21 % vol. of oxygen at natural moisture) was set in the range from 120 up to 1200 °С and was kept with an accuracy of ±12 °С. The burnt sample mass, volume of air blast and its velocity was correlated to obtaining of complex non-dimensional Re factor (Reinolds number) more than 100, that guaranteed a reliable process running in the combustion area with no risk of transferring to gasification process. Based on GOST 26517–85 (“Iron ores, sinter and pellets”) a methodology was elaborated for determining of parameters of iron ore materials status in the viscoplastic zone. The methodology comprises heating of preliminary reduced sample of a tested iron ore material in an inert gas and determination of softening temperature and smelting end by a hard rod sinking into the material layer under external pressure action. The temperature at which the layer shrinkage reaches level of 2% during heating, was taken as the softening temperature of the iron ore material. The sinking of the rod into the material by 80% was taken as the temperature of the beginning of the material melting. The interval softening-melting was determined as the difference between melting temperature and softening temperature (at sample shrinkage by 2 %).

Usability of field X-ray fluorescence analyzers for determination of the chemistry of cement raw materials - using an example of Mokrá Quarry

2016 ◽  
Author(s):  
Jiří Zimák ◽  
Kristýna Dalajková ◽  
Roman Donocik ◽  
Petr Krist ◽  
Daniel Reif ◽  
...  
Keyword(s):  
Raw Materials ◽  
X Ray
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