scholarly journals Analytical and experimental study of the thermophysical properties of blast furnace slag melts in the conditions of blast furnaces of Ukraine

2018 ◽  
pp. 137-150
Author(s):  
D.A. Stepanenko ◽  
N.A. Tsyupa ◽  
A.I. Belkova ◽  
A.S. Skachko
Keyword(s):  
Blast Furnace ◽  
Chemical Composition ◽  
Predictive Model ◽  
Thermophysical Properties ◽  
Experimental Studies ◽  
Enthalpy Changes ◽  
Optimal Value ◽  
Technical And Economic Indicators ◽  
Slag Melts ◽  
Made In

The aim of the work is to establish patterns of influence of the chemical composition of blast-furnace slags on the thermophysical properties of their melts, which is relevant to ensure high technical and economic indicators of the blast furnace. Experimental studies of the temperature of molten iron and slag at their release from a blast furnace with a volume of 1500 m3 have been carried out. It is shown that the temperatures of iron and slag have almost identical values and vary in the range of 1451÷14870С. On a Anton Paar rotary rheometer, viscosity measurements were made in the temperature range of 1320 ÷ 15000С and it was shown that the viscosity of slags from the blast furnace output exceeds its optimal value of 0.3 Pa.second. Based on the correlation-regression analysis of the literature data and the performed experimental studies, the enthalpy of the melts was determined as a function of the chemical composition of blast-furnace slags, which are represented through stoichiometry (ρ) and temperature. It is shown that when temperature fluctuations of slag melts in the range of 1453 ÷ 14870С their enthalpy changes in the range of 1933÷2031 kJ/kg. A predictive model for calculating the enthalpy of blast-furnace slags is proposed. On the basis of the proposed predictive model, the enthalpy of blast furnace slags for a blast furnace with a volume of 1500 m3 was calculated taking into account their actual temperatures at the outlet.

Experimental Studies on the Superelastic Properties of SMA Material

2010 ◽  
Vol 163-167 ◽  
pp. 2891-2895
Author(s):  
He Meng ◽  
Kun Yang ◽  
She Liang Wang
Keyword(s):  
Chemical Composition ◽  
Room Temperature ◽  
Experimental Studies ◽  
Experimental Results ◽  
Made In China ◽  
Made In

A kind of SMA material with the chemical composition of Ti-51% at Ni (made in china) which is austenitic at room temperature is tested to find out the influences of adding/unloading frequency, loading amplitude and adding/unloading cycles on the superelasitc properties of it. Then the conclusions were made according to the experimental results given in the paper. Finally, some suggestions to improve the performance of the SMA material were offered.

Research of Titaniferous Ores Melting and Properties of Cast Iron and Slag

2019 ◽  
Vol 391 ◽  
pp. 221-225
Author(s):  
Andrey N. Dmitriev ◽  
R.V. Petukhov ◽  
G.Yu. Vitkina ◽  
E.A. Vyaznikova
Keyword(s):  
Blast Furnace ◽  
Cast Iron ◽  
Chemical Composition ◽  
Iron Ore ◽  
Raw Materials ◽  
Scientific Research ◽  
Economic Indicators ◽  
Furnace Melting ◽  
Technical And Economic Indicators

Questions of melting of iron ore and raw materials with receipt of cast iron and slag are considered in vitro. The chemical composition of cast iron of slag is studied in vitro. The viscosity of slag is researched. Object of research - titaniferous ores with various contents of titan dioxide. The technical and economic indicators of a blast furnace melting an agglomerate and pellets (a consumption of coke and productivity, a chemical composition of cast iron and slag) received from a concentrate of the Kachkanarsky deposit are calculated. The technique of scientific research is used [1].

scholarly journals FORECASTING OF PHYSICO-CHEMICAL PROPERTIES OF LADLE’S SLAGS ON THE BASIS OF THE CONCEPT OF THE DIRECTED CHEMICAL COMMUNICATION

2021 ◽  
pp. 195-197
Author(s):  
Dmytro Stepanenko ◽  
Oleksandr Verhun ◽  
Volodymyr Kysliakov ◽  
Viktoriia Petrusha ◽  
Mykyta Pushkarenko
Keyword(s):  
Blast Furnace ◽  
Chemical Composition ◽  
Practical Importance ◽  
Chemical Properties ◽  
Interatomic Interaction ◽  
Forecast Model ◽  
Model Parameters ◽  
Wide Range ◽  
Temperature Dependences ◽  
Slag Melts

The work is devoted to the development of a methodology for the operational forecast of the properties of the final blast furnace slag by its chemical composition and temperature to improve the quality of hot metal in terms of sulfur content.The analysis of the accumulated experimental data on the properties of modern blast furnace slags is performed, using the criteria of the theory of directed chemical bonding the dependences of liquidus temperature on model parameters are established and an adequate forecast model of bucket slag liquid temperature on its model parameters is obtained.The created technique allows to obtain temperature dependences of density, surface tension, viscosity and electrical conductivity of real blast furnace slags in the temperature range 1200-1400 ° С.The approach to modeling of slag melts at the level of interatomic interaction used in the article can be used to develop predictive models of different technological properties of furnace slags in a wide range of temperatures. The obtained results are of practical importance and can be used for rapid prediction of the liquidity temperature of furnace slags and adjustment of their chemical composition in accordance with technological requirements.

FURTHER STUDIES ON NATURAL SELECTION AMONG HYBRIDS OF CARDUUS ACANTHOIDES AND CARDUUS NUTANS

1964 ◽  
Vol 42 (12) ◽  
pp. 1605-1613 ◽  
Author(s):  
R. J. Moore ◽  
G. A. Mulligan
Keyword(s):  
Natural Selection ◽  
Chromosome Number ◽  
Parental Species ◽  
Experimental Studies ◽  
Great Decrease ◽  
Carduus Acanthoides ◽  
Carduus Nutans ◽  
Experimental Plots ◽  
Better Than ◽  
Made In

A third 5-year survey made in 1962 of Carduus acanthoides, C. nutans, and their hybrids in Grey Co., Ontario, revealed that a great decrease in these populations had occurred. C. acanthoides and hybrids similar to this species had survived better than C. nutans but very little spread of either species seemed to have occurred in 1957–1962. In experimental plots the hybrid has been made and backcrossed to the parental species. The species differ in chromosome number (C. acanthoides, 2n = 22; C. nutans, 2n = 16) and hybrids have intermediate numbers. Evidence was found from field and experimental studies that the progeny of the F1 hybrid included a greater proportion of seedlings with the higher chromosome numbers than with the lower and intermediate numbers. It is suggested that this selection may operate through the rejection of the longer chromosomes received from C. nutans, which, in certain zygotic combinations may constitute an excess of chromatin lethal to the zygote.

JUSTIFICATION OF THE USE OF METALLURGICAL SLAGS AS A BACKFILL MATERIAL FOR QUARRY CAVITIES

2021 ◽  
pp. 15-25
Author(s):  
Volodymyr Bondarenko ◽  
◽  
Oleksandr Filonenko ◽  
Mykhailo Petlovanyi ◽  
Vladyslav Ruskykh ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Large Scale ◽  
Experimental Studies ◽  
Metallurgical Slag ◽  
Open Pit ◽  
Practical Significance ◽  
Steel Smelting ◽  
Backfill Material ◽  
Steel Making ◽  
Metallurgical Slags

Purpose. Experimental studies of the interaction of blast-furnace and steel-making slags with open pit waters during their direct contact and assessment of the volume of filling of the formed man-made cavities during mining of mineral deposits. Methods. Based on the analysis, the current low level of metallurgical slag and the lack of real and effective directions of their large-scale utilization were determined. The laboratory studies of the interaction of metallurgical slags with open pit water at a certain time of interaction, generally accepted methods for studying the chemical composition and concentration of substances in water, computer-aided design software packages and drawings to determine the volumes of the open pit mined-out area were used. Results. The dynamics of changes in the products of interactions of steel-smelting slags with open-pit waters at a certain ratio and period of interaction was investigated. It was found that the concentration of pollutants upon contact of water with steel-making slag changes according to polynomial dependences on the time of their interaction, decreasing by the 30th day, which eliminates the danger for the aquifer. The safest type of metallurgical slag was recommended for the formation of the bottom layer of the backfill massif. The volumes of the mined-out area of the open pit were determined in detail to assess the volumes of placement of the backfill material based on metallurgical slags. Scientific novelty. The safety of the contact of backfill materials based on steelmaking slags with open pit water was scientifically proven, which is confirmed by the established polynomial patterns of changes in concentrations and pollutants from the ratio and time of interaction. Practical significance. The formation of the backfill massif on the basis of blast-furnace dump and steel-smelting slags will allow achieving an environmental effect, such as their safe disposal as a reclamation of technologically disturbed lands by mining and restoration of the economic value of the land plot, as well as preventing the formation of new dumps.

Thermal Acclimation of a Central Neurone in Helix Aspersa: III. Ionic Substitution and Related Studies

1979 ◽  
Vol 78 (1) ◽  
pp. 201-211
Author(s):  
C. K. LANGLEY
Keyword(s):  
Chemical Composition ◽  
Electrical Properties ◽  
Membrane Resistance ◽  
Thermal Acclimation ◽  
Neuronal Membrane ◽  
Electrical Characteristics ◽  
Ionic Substitution ◽  
Warm Acclimation ◽  
Sodium And Potassium ◽  
Made In

(1) Thermal acclimation of the Fi neurone does not appear to result from changes in the chemical composition of the haemolymph. This is deduced from the lack of effect on the electrical characteristics of control neurones of either pooled haemolymph from acclimated individuals, or variations in the experimental salines made in accordance with haemolymph analyses. (2) Changes in [Ca]0 tended to act cooperatively with temperature shifts to induce alterations in the electrical properties of the neurone, notably to increase excitability and lower membrane resistance. (3) Warm acclimation was associated with increased resting conductance of the neuronal membrane to sodium and potassium, whereas chloride conductance appeared little affected.

Modeling of Alteration Behavior on Blended Cementitious Materials

2011 ◽  
Author(s):  
Hitoshi Owada ◽  
Tomoko Ishii ◽  
Mayumi Takazawa ◽  
Hiroyasu Kato ◽  
Hiroyuki Sakamoto ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Fly Ash ◽  
Chemical Composition ◽  
Mineral Composition ◽  
Blast Furnace Slag ◽  
Fine Powder ◽  
Cementitious Materials ◽  
Leaching Tests ◽  
Measured Concentration ◽  
Furnace Slag

A “realistic alteration model” is needed for various cementitious materials. Hypothetical settings of mineral composition calculated based on the chemical composition of cement, such as Atkins’s model, have been used to estimate the alteration of cementitious material. However, model estimates for the concentration of certain elements such as Al and S in leachate have been different from experimental values. In a previous study, we created settings for a mineralogical alteration model by taking the initial chemical composition of cementitious materials from analysis results in experiments and applying their ratios to certain hydrated cement minerals, then added settings for secondary generated minerals in order to account for Ca leaching. This study of alteration estimates for ordinary portland cement (OPC) in groundwater showed that the change in Al and S concentrations in simulated leachate approached values for actual leachate[1]. In the present study, we develop an appropriate mineral alteration model for blended cementitious materials and conduct batch-type leaching experiments that use crushed samples of blast furnace slag cement (BFSC), silica cement (SC), and fly ash cement (FAC). The cement blends in these experiments used OPC blended with blast furnace slag of 70 wt.%, silica cement consisting of an amorphous silica fine powder of 20 wt.%, and fly ash of 30 wt.%. De-ionized water was used as the leaching solution. The solid-liquid ratios in the leaching tests were varied in order to simulate the alteration process of cement hydrates. The compositions of leachate and minerals obtained from leaching tests were compared with those obtained from models using hypothetical settings of mineral composition. We also consider an alteration model that corresponds to the diversity of these materials. As a result of applying the conventional OPC model to blended cementitious materials, the estimated Al concentration in the aqueous solution was significantly different from the measured concentration. We therefore propose an improved model that takes better account of Al behavior by using a more reliable initial mineral model for Al concentration in the solution.

scholarly journals Properties and application of carbon composite brick for blast furnace hearth

2015 ◽  
Vol 51 (2) ◽  
pp. 143-151 ◽  
Author(s):  
K.X. Jiao ◽  
J.L. Zhang ◽  
Z.J. Liu ◽  
Y.G. Zhao ◽  
X.M. Hou
Keyword(s):  
Blast Furnace ◽  
Chemical Composition ◽  
Raw Materials ◽  
Protective Layer ◽  
Silicon Powder ◽  
Slag Layer ◽  
Carbon Composite ◽  
Carbon Layer ◽  
Furnace Hearth ◽  
Blast Furnace Hearth

A type of carbon composite brick was produced via the microporous technique using natural flack graphite, ?-Al2O3 and high-quality bauxite chamotte (Al2O3?87 mass%) as raw materials with fine silicon powder as additive. The composition and microstructure of the obtained carbon composite were characterized using chemical analysis, XRD and SEM with EDS. The high temperature properties of thermal conductivity, oxidization and corrosion by molten slag and hot metal of the composite were analyzed. Based on these, the type of carbon composite brick worked in a blast furnace hearth for six years was further sampled at different positions. The protective layer was found and its chemical composition and microscopic morphology were investigated. It is found that the carbon composite brick combines the good properties of both the conventional carbon block and ceramic cup refractory. The protective layer near the hot face consists of two separated sublayers, i.e. the slag layer and the carbon layer. A certain amount of slag phase is contained in the carbon layer, which is caused by the reaction of coke ash with the refractory. No obvious change in the chemical composition of the protective layer along the depth of the sidewall is found. This work provides a useful guidance for the extension of the lifetime of blast furnace hearths.

scholarly journals PROPERTIES OF CONCRETE USING BLAST-FURNACE SLAG CEMENT TYPE A WITH MODIFIED CHEMICAL COMPOSITION

2010 ◽  
Vol 64 (1) ◽  
pp. 244-250 ◽  
Author(s):  
Shingo MIYAZAWA ◽  
Takashi YOKOMURO ◽  
Hiromi FUJIWARA ◽  
Kiyoshi KOIBUCHI
Keyword(s):  
Blast Furnace ◽  
Chemical Composition ◽  
Blast Furnace Slag ◽  
Type A ◽  
Cement Type ◽  
Slag Cement ◽  
Furnace Slag
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