scholarly journals Treatment and utilization of artificial aggregate in the production of cement composites

2021 ◽  
Vol 900 (1) ◽  
pp. 012032
Author(s):  
R Papesch ◽  
K Macalova ◽  
J Charvat ◽  
T Dvorsky ◽  
V Vaclavik
Keyword(s):  
Raw Materials ◽  
Steel Slag ◽  
Steel Production ◽  
Mineralogical Composition ◽  
Positive Influence ◽  
Partial Replacement ◽  
Steel Ladle ◽  
Cement Composites ◽  
Ladle Slag ◽  
Raw Materials Policy

Abstract The aim of the work is to find a suitable way of treatment of steel ladle slag for subsequent use as a partial replacement of the binder component in cement composites. The goal is based on the raw materials policy of the Czech Republic. Within this work is solved the issue of possible use of steel slag as the largest by-product of steel production. The work is focused on a specific ladle slag from ladle furnaces, by which are equipped the modern steel plants. Ladle slag is similar in chemical composition to Portland cement. However, its mineralogical composition should be taken into account in relation to its expansion reactions and lower hydraulic activity. One of the goals is the research of effect of particle size in cement-slag mixtures. The slag was ground for research on two different specific surfaces - coarsely in a vibrating mill and finely in a ball mill. The research within the experimental part of the work verified the positive influence of ladle slag on the properties of fresh and hardened mortar mixtures. Tensile bending strengths and compressive strengths are for some mixtures with ladle slag even higher than the strengths of the reference mixtures.

scholarly journals Sustainability Potential Evaluation of Concrete with Steel Slag Aggregates by the LCA Method

2020 ◽  
Vol 12 (23) ◽  
pp. 9873
Author(s):  
Vojtěch Václavík ◽  
Marcela Ondová ◽  
Tomáš Dvorský ◽  
Adriana Eštoková ◽  
Martina Fabiánová ◽  
...  
Keyword(s):  
Life Cycle ◽  
Construction Industry ◽  
Raw Materials ◽  
Steel Slag ◽  
Physical And Mechanical Properties ◽  
Partial Replacement ◽  
Utilization Rate ◽  
Natural Aggregate ◽  
Concrete Production ◽  
Natural Aggregates

Sustainability in the construction industry refers to all resource-efficient and environmentally responsible processes throughout the life cycle of a structure. Green buildings may incorporate reused, recycled, or recovered materials in their construction. Concrete is as an important building material. Due to the implementation of by-products and waste from various industries into its structure, concrete represents a significant sustainable material. Steel slag has great potential for its reuse in concrete production. Despite its volume changes over time, steel slag can be applied in concrete as a cement replacement (normally) or as a substitute for natural aggregates (rarely). This paper focused on an investigation of concrete with steel slag as a substitute of natural gravel aggregate. Testing physical and mechanical properties of nontraditional concrete with steel slag as a substitute for natural aggregates of 4/8 mm and 8/16 mm fractions confirmed the possibility of using slag as a partial replacement of natural aggregate. Several samples of concrete with steel slag achieved even better mechanical parameters (e.g., compressive strength, frost resistance) than samples with natural aggregate. Moreover, a life cycle assessment (LCA) was performed within the system boundaries cradle-to-gate. The LCA results showed that replacements of natural aggregates significantly affected the utilization rate of nonrenewable raw materials and reduced the overall negative impacts of concrete on the environment up to 7%. The sustainability indicators (SUI), which considered the LCA data together with the technical parameters of concrete, were set to evaluate sustainability of the analyzed concretes. Based on the SUI results, replacing only one fraction of natural gravel aggregate in concrete was a more sustainable solution than replacing both fractions at once. These results confirmed the benefits of using waste to produce sustainable materials in construction industry.

Industrial, Ecological and Resource-Efficient Aspects of Vanadium Production and Use of Technogenic Vanadium Sources

2017 ◽  
Vol 265 ◽  
pp. 994-998 ◽  
Author(s):  
E.S. Makhotkina ◽  
M.V. Shubina
Keyword(s):  
Raw Materials ◽  
Steel Slag ◽  
Steel Production ◽  
Raw Material ◽  
Hydrometallurgical Processing ◽  
Material Sources ◽  
Vanadium Extraction ◽  
Extraction Degree ◽  
The Cost ◽  
New Applications

The causes of the global vanadium consumption increase are described and new applications of this metal are given in the article. The main natural sources of vanadium are titanomagnetite, which is a strategic mineral raw material. The current volumes of vanadium extraction from natural raw materials do not match the demand of the market. Therefore there is an urgent need for recycling of secondary and technogenic sources. Partially the basic existing technologies processing vanadium-containing waste are reviewed. The effect of these wastes on the environment and human health is analyzed. The importance of vanadium steel slag recycling for the ecological state of industrial regions, resource-efficiency in expanding the raw material sources of vanadium and reducing the cost of steel production in general is shown. The results of studies on the extraction of vanadium in the form of soluble vanadate of metallurgical vanadium slag using hydrometallurgical processing are demonstrated. The analysis of the received values of the vanadium extraction degree was conducted. The influence of various factors on the completeness of extraction was examined. A significant influence on the vanadium extraction degree of slag chemical composition, the ratio of slag and alkaline additives in the charge, conditions of roasting and leaching was revealed.

The Influence of Sulfates on Tobermorite Formation in Lime-Ash Composite

2018 ◽  
Vol 916 ◽  
pp. 179-183
Author(s):  
Vit Cerný ◽  
Jindrich Melichar ◽  
Jan Fleischhacker ◽  
Rostislav Drochytka
Keyword(s):  
Fly Ash ◽  
Hydrothermal Synthesis ◽  
Building Material ◽  
Raw Materials ◽  
Mineralogical Composition ◽  
Positive Influence ◽  
Hydrothermal Conditions ◽  
Long Time ◽  
Aerated Concrete ◽  
Ecological Building

Autoclaved aerated concrete is an ecological building material with suitable properties and long-time tradition. The research of secondary raw materials usage and technology optimization is needed in order to increase the efficiency and sustainability of its production. It is important to focus on development of mineralogical composition while studying the influence of input materials and the parameters of hydrothermal synthesis on the properties of final product. This is especially important in case of tobermorite formation as the bearer of strength in the structure. Main focus of this paper is applicability of fly ash (silica component) and admixture of energo-gypsum (sulfate component) in production of lime-ash composite in hydrothermal conditions. The research was focused on autoclaving of samples at temperature of 170°C in three various isothermal sustains. Final samples were analyzed by XRD and SEM in order to proof the influence of input materials. Results show that 5% admixture of energo-gypsum had positive influence on tobermorite formation.

scholarly journals THE EFFECT OF LONG-TERM STORAGE OF ELECTRIC STEEL SMELTING SLAGS IN DUMPS ON THEIR PROPERTIES

2020 ◽  
pp. 32-39
Author(s):  
Aleksey Pogromskiy ◽  
Tat'yana Anikanova
Keyword(s):  
Raw Materials ◽  
Steel Slag ◽  
Physical And Mechanical Properties ◽  
Road Construction ◽  
Mineral Resources ◽  
Mineralogical Composition ◽  
Electric Steel ◽  
Steel Smelting ◽  
Current Output ◽  
Main Component

construction, repair and reconstruction of roads require high costs of mineral raw materials in the form of sand, gravel, mineral powder. However, its reserves on the territory of our country are distributed unevenly, which causes significant transportation costs for the delivery of mineral resources to construction sites. In addition, mineral resources are inevitably reduced over time, which requires extensive involvement in the construction of roads of non-traditional types of raw materials, as well as industrial waste. The paper presents the results of studies of the properties of electric steel slag, the current output and stored in the dumps for several years. The main component of electric steel-smelting slags, both fresh and dumped, lying in dumps for about 20 years, is shannonite or γ-modification of calcium orthosilicate C2S. It has been established that the mineralogical composition of the Oskol Electrometallurgical Combine's slag is represented by hematite, wuistite, calcite, periclase, and also portlandite, formed during quenching of lime. Analysis of diffractograms of slags of different shelf life shows that in the initial periods of slag storage in the dumps there is a final quenching of lime and its carbonization with the formation of calcite. The results of the determination of the granulometric composition of the slag of different storage periods showed a decrease with time of the number of fine fractions and an increase in large fractions. It is established that when using electric steel-smelting slags in the construction and repair of highways, it is necessary to take into account changes in the physical and mechanical properties of materials. The processes that take place during the maintenance of slags in dumps determine the suitability of the use of slag mineral materials in road construction.

scholarly journals Research on the use of Ferro-Chrome slag in civil engineering applications

2018 ◽  
Vol 149 ◽  
pp. 01017 ◽  
Author(s):  
Khalifa S. Al-Jabri
Keyword(s):  
Civil Engineering ◽  
Raw Materials ◽  
Coal Fly Ash ◽  
Steel Slag ◽  
Road Construction ◽  
Partial Replacement ◽  
Engineering Applications ◽  
Environmental Pressures ◽  
Waste Products ◽  
Ferrochrome Slag

Over recent decades there has been rapid increase in the industrial waste materials and by-products yields due to the progressive growth rate of population, development of industry and technology and the growth of consumerism. With the growing environmental pressures to reduce waste and pollution, Intensive research studies have been conducted to explore all suitable reuse methods. Wastes such as construction waste, blast furnace, steel slag, coal fly ash and bottom ash have been approved in many places as alternative materials in bridges, roads, pavements, foundations and building construction. The use of industrial solid waste as a partial replacement of raw materials in construction activities not only saves landfill space but also reduces the demand for extraction of natural raw materials. Ferrochrome slag is a by-product from the production of chrome. There are environmental and economic advantages in seeing slags as a potentially useful resource rather than as waste products. Slag management at ferrochrome producing companies has been influenced by the limited space available and financial cost implications of the slag dumps. Internationally, e.g. South Africa, India, Norway, Turkey, East Europe, China, Sweden and USA, ferrochrome slag is used commercially in the road and construction Industries. This material is being used for road construction, as aggregates in concrete industry, brick manufacturing, and in pavement construction as engineering fill and has recently been tried in cement. This paper presents an overview of the recent advances of the use of ferrochrome slag in various civil engineering applications such as road construction, and cement and concrete industries.

scholarly journals Study of blast furnace heat filterability through coke filling

2019 ◽  
Vol 75 (3) ◽  
pp. 315-321
Author(s):  
A. Yu. Chernavin ◽  
V. A. Kobelev ◽  
D. A. Chernavin ◽  
G. A. Nechkin
Keyword(s):  
Blast Furnace ◽  
Gas Permeability ◽  
Raw Materials ◽  
Mineralogical Composition ◽  
Positive Influence ◽  
Calcium Flux ◽  
Extreme Character ◽  
Additional Input ◽  
Bf Slag ◽  
Materials Behavior

Increase of gas permeability of burden materials column lower part is one of the way of blast furnace heat intensification. Filterability of intermediate slag through coke filling determines the gas permeability of the lower zone and the blast furnace heat running. To study the filterability a methodology was elaborated and implemented, which enabled to estimate reliably the iron ore raw materials behavior in the blast furnace at high temperatures. By laboratory studies influence on the filterability of BF slag melt was determined, when MgO, MnO and CaO adding to the burden, depending on the oxides mineralogical composition. The positive influence of magnesium oxide on the slag filterability has an extreme character, at that the sinter basicity has a considerable influence. The mineral form of magnesium-containing additives introduced into the burden substantially influenced the filterability on heat products in blast furnace. Replace ofsiderite and dolomite by other magnesium-containing materials facilitates to improving of slag filterability through coke filling. Additional input of manganese in the form of manganese limestone or manganese-containing ferritic-calcium flux is an effective mean to improve filterability of sinter smelting products through coke filling. Transfer to hot metal smelting from fluxed pellets and sinter will facilitate heat products filterabilityincrease thanks to close physical andchemical properties of BF burden components in respect of smelting and slag filtering through coke filling.

scholarly journals Study of the Suitability of Different Types of Slag and Its Influence on the Quality of Green Grouts Obtained by Partial Replacement of Cement

Materials ◽  
2019 ◽  
Vol 12 (7) ◽  
pp. 1166 ◽  
Author(s):  
Francisca Perez-Garcia ◽  
Maria Eugenia Parron-Rubio ◽  
Jose Manuel Garcia-Manrique ◽  
Maria Dolores Rubio-Cintas
Keyword(s):  
Steel Industry ◽  
Raw Materials ◽  
Steel Slag ◽  
Partial Replacement ◽  
Steel Manufacturing ◽  
Different Types ◽  
Furnace Slag ◽  
Slag Waste ◽  
Minimum Resistance

This paper is part of a research line focused on the reduction of the use of cement in the industry. In this work, the study of work methodologies for the manufacture of green cementitious grout mixtures is studied. Grout is widely used in construction and it requires an important use of raw materials. On the other hand, the steel industry faces the problem of the growing generation of slag wastes due to the increase in steel manufacturing. The green grout aims to achieve the dual objective of reducing the demand for cement and improve the slag waste valorization. Slag is not introduced as an aggregate but through the direct replacement of cement and no additives. The research seeks a product where we can use steel slag intensively, guaranteeing minimum resistance and workability. Results with substitutions between a 25% to 50% and water/cement ratio of 1 are presented. In particular, the suitability of different slags (two Ladle Furnace Slag (LFS) and one Blast Furnace Slag (GGBS)) in the quality of the final product are analyzed. The feasibility of replacing cement with slag and the importance of the origin and pretreatment are highlighted.

scholarly journals Characterization of Ladle Furnace Slag from Carbon Steel Production as a Potential Adsorbent

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Ankica Rađenović ◽  
Jadranka Malina ◽  
Tahir Sofilić
Keyword(s):  
Surface Area ◽  
Coming Out ◽  
Steel Slag ◽  
Steel Production ◽  
Mineralogical Composition ◽  
Basic Oxygen Furnace ◽  
Bet Surface Area ◽  
Ladle Furnace ◽  
Secondary Refining ◽  
Furnace Slag

A promising type of steel slag for applications is the ladle furnace (LF) slag, which is also known as the basic slag, the reducing slag, the white slag, and the secondary refining slag. The LF slag is a byproduct from further refining molten steel after coming out of a basic oxygen furnace (BOF) or an electric arc furnace (EAF). The use of the LF slag in further applications requires knowledge of its characteristics. The LF slag characterization in this paper has been performed using the following analytical methods: chemical analysis by energy dispersive spectrometry (EDS), mineralogical composition by X-ray diffraction (XRD), surface area properties by the Brunauer-Emmett-Teller (BET) and the Barrett-Joyner-Halenda (BJH) methods, surface chemistry by infrared absorption (FTIR) spectroscopy, and morphological analysis by scanning electron microscopy (SEM). The results showed that the main compounds are calcium, silicon, magnesium, and aluminium oxides, and calcium silicates under their various allotropic forms are the major compounds in the LF slag. Surface area properties have shown that the LF slag is a mesoporous material with relatively great BET surface area. The ladle furnace slag is a nonhazardous industrial waste because the ecotoxicity evaluation by its eluate has shown that the LF slag does not contain constituents which might in any way affect the environment harmfully.

Analysis on the Microstructure Characteristics of Steel-Slag Based Ceramics

2010 ◽  
Vol 150-151 ◽  
pp. 133-138 ◽  
Author(s):  
Hao Bai ◽  
Pu Liu ◽  
Xian Bin Ai ◽  
Li Hua Zhao ◽  
Qi Tang ◽  
...  
Keyword(s):  
Building Materials ◽  
Sintering Temperature ◽  
Raw Materials ◽  
Steel Slag ◽  
Steel Production ◽  
Xrd Analysis ◽  
Key Factors ◽  
Ceramic Tiles ◽  
Excellent Performance ◽  
Crystal Phases

As by-product of steeling making, steel slag accounts for 10% to 13% of steel production. Utilization of it as resource has been tried in many fields. For example, it can be used as building materials, most for paving and backfilling. However, utilization level of steel slag is still low, and to find a novel way to utilize steel slag efficiently is urgent. Steel slag includes much calcium and silicon, similar to those of clay, which means that it can be one of the raw materials for ceramic sintering. In this research, the process of steel-slag based ceramics sintering was developed. The ceramic tiles with excellent performance were obtained, with up to 36% steel slag added. By EPMA, the possible crystal phases that exist in the ceramic samples have been discussed. By XRD analysis, the main crystal phases of steel slag ceramics were identified, which are anorthite, α-quartz and magnetite. The clinoenstatite can be obtained through increasing the proportion of steel slag in the formula. The diopside can be obtained if the talc was added. These are key factors to obtain excellent performance ceramic tiles under low sintering temperature.

scholarly journals Nutritional, Sensory, Texture Properties and Volatile Compounds Profile of Biscuits with Roasted Flaxseed Flour Partially Substituting for Wheat Flour

2021 ◽  
Vol 11 (11) ◽  
pp. 4791
Author(s):  
Simona Maria Man ◽  
Laura Stan ◽  
Adriana Păucean ◽  
Maria Simona Chiş ◽  
Vlad Mureşan ◽  
...  
Keyword(s):  
Wheat Flour ◽  
Phenolic Content ◽  
Control Sample ◽  
Positive Influence ◽  
Partial Replacement ◽  
Total Phenolic ◽  
Volatile Profile ◽  
Texture Properties ◽  
Flaxseed Flour ◽  
Spread Factor

The study aimed at assessing effects of partial replacement (0–40%) of wheat flour with roasted flaxseed flour (RFSF) on the quality attributes of biscuits. Nutritional, antioxidative, volatile and sensory properties, as well as texture analysis and the contents of macroelements and microelement were studied. Increasing RFSF content in biscuits resulted in a significant increase (p < 0.05) in protein (from 8.35% to 10.77%), fat (from 15.19% to 28.34%) and ash (from 1.23% to 2.60%) while the hardness and spread factor of the biscuits decreased with the increased level of roasted flaxseed flour. Moreover, the addition of 40% RFSF registered a positive influence on the fibre content of the final baked biscuits, increasing its value about 6.7-fold than in the control sample. Total phenolic content, antioxidant activity and biscuits’ aroma volatile profile increased their amounts with RFSF addition. The nutritional, textural and sensorial results of the present study demonstrated that 25% RFSF could be added in the biscuits manufacturing without affecting the biscuits aftertaste, offering promising healthy and nutritious alternative to consumers.

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