The Alkaline Fusion-Hydrothermal Synthesis of Blast Furnace Slag-Based Zeolite (BFSZ): Effect of Crystallization Time

Minerals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1314
Author(s):  
Changxin Li ◽  
Xiang Li ◽  
Qingwu Zhang ◽  
Li Li ◽  
Shuai Wang
Keyword(s):  
Blast Furnace ◽  
Hydrothermal Synthesis ◽  
Blast Furnace Slag ◽  
Raw Material ◽  
Molar Ratio ◽  
Crystallization Time ◽  
Alkaline Fusion ◽  
Developed Surface ◽  
Main Component ◽  
Furnace Slag

Blast furnace slag (BFS) is usually regarded as a by-product of the steel industry, which can be utilized as raw material for preparing BFS-based zeolite (BFSZ). In this study, BFSZ was successfully prepared from BFS using alkaline fusion-hydrothermal synthesis. Via the analyses by XRD, SEM, EDX, XRF, FT-IR, elemental mapping and BET/BJH methods, BFSZ crystallization was almost complete at 6 h. With a further increase of crystallization time to 8 h, no significant effect on the formation of crystalline phase was found. Meanwhile, the zeolite content Si/Al (Na/Al) molar ratio was highly affected by crystallization time. The main component of BFSZ prepared at 6 h is cubic crystal with developed surface, with particle size around 2 μm. Moreover, further increasing the crystallization time will not significantly influence the size and morphology of BFSZ product.

scholarly journals The Effects of Temperature on the Hydrothermal Synthesis of Hydroxyapatite-Zeolite Using Blast Furnace Slag

Materials ◽  
2019 ◽  
Vol 12 (13) ◽  
pp. 2131 ◽  
Author(s):  
G.U. Ryu ◽  
G.M. Kim ◽  
Hammad R. Khalid ◽  
H.K. Lee
Keyword(s):  
Blast Furnace ◽  
Hydrothermal Synthesis ◽  
Blast Furnace Slag ◽  
Raw Material ◽  
X Ray Diffraction ◽  
X Ray ◽  
Different Temperatures ◽  
Type Zeolite ◽  
Effects Of Temperature ◽  
Furnace Slag

Blast furnace slag, an industrial by-product, is emerging as a potential raw material to synthesize hydroxyapatite and zeolite. In this study, the effects of temperature on the hydrothermal synthesis of hydroxyapatite-zeolite from blast furnace slag were investigated. Specimens were synthesized at different temperatures (room temperature, 50, 90, 120, or 150 °C). The synthesized specimens were analyzed qualitatively and quantitatively via X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), BET/BJH, and scanning electron microscopy/energy dispersive using X-ray analysis (SEM/EDX). It was found that the hydroxyapatite phase was synthesized at all the reaction temperatures, while faujasite type zeolite appeared in the specimens synthesized at 90 and 120 °C. Moreover, faujasite was replaced by hydroxysodalite in the specimens synthesized at 150 °C. Additionally, the crystals of the hydroxyapatite tended to become larger and total crystallinity increased as the reaction temperature increased.

scholarly journals Hydrothermal Synthesis of Zeolite A Using Blast Furnace Slag

2005 ◽  
Vol 45 (6) ◽  
pp. 937-945 ◽  
Author(s):  
Yoshiyuki SUGANO ◽  
Ryouji SAHARA ◽  
Taichi MURAKAMI ◽  
Takayuki NARUSHIMA ◽  
Yasutaka IGUCHI ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Hydrothermal Synthesis ◽  
Blast Furnace Slag ◽  
Zeolite A ◽  
Furnace Slag

Lost Wax Casting Process Design of Artificial Jade Cup Basing on Blast Furnace Slag

2014 ◽  
Vol 937 ◽  
pp. 462-464 ◽  
Author(s):  
Wei You ◽  
Yan Mei Jiang ◽  
Qian Lin ◽  
Xiao Xia Yu ◽  
Peng Fei Li ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Production Process ◽  
Blast Furnace Slag ◽  
Casting Process ◽  
Raw Material ◽  
Added Value ◽  
Industrial Solid Waste ◽  
Shell Mould ◽  
Additional Value ◽  
Furnace Slag

The blast furnace slag is an industrial solid waste in the production process, this paper deals with the blast furnace slag as products -- artificial jade cup handicraft lost wax casting process of high additional value of main raw material, firstly analyses the production process of chemical composition and artificial jade common blast furnace slag and natural jade, then the detailed design of the lost wax casting process of artificial jade cup, including manufacturing, shell mould manufacturing, dewaxing, baking, imitation jade material melting and casting. The lost wax casting method for producing artificial jade crafts complex products, the added value of products, so as to achieve a high added value utilization of blast furnace slag.

scholarly journals Preparation and Properties of Blast Furnace Slag Glass Ceramics Containing Cr2O3

2019 ◽  
Vol 38 (2019) ◽  
pp. 726-732 ◽  
Author(s):  
Yi-ci Wang ◽  
Wen-bin Xin ◽  
Xiao-geng Huo ◽  
Guo-ping Luo ◽  
Fang Zhang
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Bending Strength ◽  
Glass Ceramics ◽  
Scientific Basis ◽  
Raw Material ◽  
Nucleation Agent ◽  
Parent Glass ◽  
Factsage Software ◽  
Furnace Slag

AbstractIn this study, the blast furnace slag of the Baotou Steel and Iron Company was used as the main raw material to prepare glass ceramics with diopside as the main crystal phase. The composition of the parent glass was designed by thermodynamic calculations with FactSage software. Small amounts of the nucleation agent Cr2O3 were then added to the parent glass to induce crystallization. Differential thermal analysis was used to determine the nucleation and crystallization temperatures of the glasses, and scanning electron microscopy and X-ray diffraction were adopted to determine the microstructures and phase compositions of the glasses after heat treatment, respectively. The results showed that glass ceramics of the diopside phase can be prepared with up to 73 wt% blast furnace slag when 1.44–1.91 wt% Cr2O3 is added, and the ceramics have uniform compact grains and a high bending strength of about 84.6–101.7 MPa. In addition, the mechanical properties are better than those of natural marble and granite. These results provide basic information and a scientific basis for industrial production of diopside glass ceramics using molten blast furnace slag as the main raw material.

scholarly journals Influence of the increased content of Calumite blast-furnace slag on the melting of sodium–calcium–silicate glass

2019 ◽  
Vol 138 (6) ◽  
pp. 4571-4583
Author(s):  
Anna A. Kuśnierz ◽  
Magdalena Szumera ◽  
Magda Kosmal ◽  
Paweł Pichniarczyk
Keyword(s):  
Thermal Analysis ◽  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Raw Materials ◽  
Melting Process ◽  
Raw Material ◽  
Glass Mass ◽  
Sodium Calcium ◽  
The Cost ◽  
Furnace Slag

Abstract A glass set with a high content of blast-furnace slag and a reduced amount of traditional raw materials requires optimization of the raw material composition and adjustment of its specificity to the temperature regime of melting, homogenizing and clarifying the glass mass. The introduction of an increased amount of blast-furnace slag allows to reduce the cost of raw materials: soda, limestone and high-class sand, reduce energy costs, whose consumption significantly decreases and reduces CO2 emissions in line with EU requirements. The tests of thermal analysis of a glass set with different contents of Calumite are aimed at learning the mechanism of its operation by determining the changes caused by its different presence in the course of subsequent reactions between the components of the glass set. Analysis of the influence of the addition of different Calumite slag contents treated as a substitute for the raw material on the melting process of glassware sets was analyzed. The tests were carried out using differential thermal analysis (DTA) and thermogravimetry (TG) based on the model glass [mass%]: 73.0% SiO2, 1.0% Al2O3, 10.0% CaO, 2.0% MgO and 14.0% Na2O. The effect of combining Calumite with sulphate and multi-component fining agent—mixtures of As2O3, Sb2O3, NaNO3 in proportions of 1:1:1 for chemical reaction and phase transformation, was investigated.

Slag-Sulphate Binder Preparation

2013 ◽  
Vol 818 ◽  
pp. 68-71 ◽  
Author(s):  
Dominik Gazdič
Keyword(s):  
Blast Furnace ◽  
Portland Cement ◽  
Blast Furnace Slag ◽  
Raw Material ◽  
Hydration Process ◽  
Technological Properties ◽  
Furnace Slag

Within the work the questions of the slag-sulphate binder preparation were solved. It was specifically a monitoring of obtained technological properties and course of the hydration process in dependence on dosing ratio of particular binder components. A finely ground Stramberk blast furnace slag was the basic raw material to which Polish natural anhydrite was added together with Portland cement CEM I 42,5 N as alkaline exciter.

Research on Modifying Blast Furnace Slag as a Raw Material of Slag Fiber

2015 ◽  
Vol 30 (3) ◽  
pp. 374-380 ◽  
Author(s):  
Jie Li ◽  
Weixing Liu ◽  
Yuzhu Zhang ◽  
Aimin Yang ◽  
Kai Zhao
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Raw Material ◽  
Furnace Slag

scholarly journals Strength and Microstructure Characteristics of Blended Fly Ash and Ground Granulated Blast Furnace Slag Geopolymer Mortars with Na and K Silicate Solution

Materials ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 211
Author(s):  
Mateusz Sitarz ◽  
João Castro-Gomes ◽  
Izabela Hager
Keyword(s):  
Blast Furnace ◽  
Fly Ash ◽  
Alkaline Solution ◽  
Blast Furnace Slag ◽  
Physical And Mechanical Properties ◽  
Silicate Solution ◽  
Molar Ratio ◽  
Microstructure Observation ◽  
Granulated Blast Furnace Slag ◽  
Furnace Slag

Mineral geopolymer binders can be an attractive and more sustainable alternative to traditional Portland cement materials for special applications. In geopolymer technology the precursor is a source of silicon and aluminium oxides, the second component is an alkaline solution. In the synthesis of geopolymer binders the most commonly used alkaline solution is a mixture of sodium or potassium water glass with sodium or potassium hydroxide or silicate solution with a low molar ratio, which is more convenient and much safer in use. In this paper, we present the influence of sodium or potassium silicate solution on the physical and mechanical properties of fly ash and ground granulated blast furnace slag-based geopolymer mortars. Mercury intrusion porosimetry and microstructural observation allowed for comparing the structure of materials with a different type of alkaline solution. The evolution of compressive and flexural tensile strength with time determined for composites using 10%, 30% and 50% slag contents (referring to fly ash mass) was analysed. The tests were performed after 3, 7, 14 and 28 days. It was observed that, as the amount of slag used increases in the precursor, the strength of the material grows. Mortars with the sodium alkaline solution were characterised by a higher strength at a young age. However, the values of strength 28 days were higher for geopolymers with potassium alkaline solution reaching 75 MPa in compression. Geopolymer mortar microstructure observation indicates a high matrix heterogeneity with numerous microcracks. Matrix defects may be caused by the rapid kinetics of the material binding reaction or shrinkage associated with the drying of the material.

scholarly journals Blast Furnace Slag Disposal Problems in the Context of the Transition to a Circular Economy

2021 ◽  
pp. 129-145
Author(s):  
V. Lepa ◽  
◽  
O. Prohnymak ◽  
Keyword(s):  
Blast Furnace ◽  
Circular Economy ◽  
Blast Furnace Slag ◽  
Metallurgical Industry ◽  
Industrial Sector ◽  
Cement Industry ◽  
Raw Material ◽  
The Creation ◽  
Slag Processing ◽  
Furnace Slag

The problem of the accumulation of waste from the metallurgical industry in Ukraine, in particular, blast furnace slag, has an economic and environmental component. Therefore, the main problems, first of all, include the absence of a criterion for the greening of the industrial sector among the priorities of Ukraine's economic policy. The article examines the situation in the slag industry of Ukraine, summarizes the existing experience of using metallurgical slags as technogenic raw materials. The problems of introducing a circular economy in the territory of intensive development of the metallurgical industry are considered primarily in the context of creating a flexible infrastructure for processing metallurgical waste, because the problem of waste is at the center of attention of the entire circular economy. But such an infrastructure cannot be created without overcoming the technological, economic, and institutional problems of utilizing blast-furnace slags in Ukraine, which hinder the creation of a slag processing industry on the principles of a circular economy. Based on the assessment of macroeconomic and environmental effects from the introduction of elements of a circular economy in the domestic metallurgical industry, the resource value of blast furnace slags as a technogenic raw material for the construction industry, in particular the cement industry, as well as road construction and other areas of use, has been proved. The ways of solving the economic and institutional problems of slag processing at the macro-, meso- and microeconomic levels are given, proposals are made to improve the legal framework for the development of the circular economy, the participation of the state, local authorities and business in the creation of a domestic industry for the processing of blast-furnace slag.

scholarly journals A Study on Reduction of Copper Smelting Slag by Carbon for Recycling into Metal Values and Cement Raw Material

2020 ◽  
Author(s):  
Urtnasan Erdenebold ◽  
Jei-Pil Wang
Keyword(s):  
Blast Furnace ◽  
Iron Oxide ◽  
Blast Furnace Slag ◽  
Copper Slag ◽  
Raw Material ◽  
Copper Smelting ◽  
Pig Iron ◽  
Reduction Smelting ◽  
Smelting Slag ◽  
Furnace Slag

Copper smelting slag is a solution of molten oxides created during the copper smelting and refining process, and about 1.5 million tons of copper slag is generated annually in Korea. Oxides in copper smelting slag include ferrous (FeO), ferric oxide (Fe­2O3), silica (SiO­2 from flux), alumina (AI2O3), calcia (CaO) and magnesia (MgO). Main oxides in copper slag, which iron oxide and silica, exist in the form of fayalite (2FeO·SiO2). Since the copper smelting slag contains high content of iron, and copper and zinc. Common applications of copper smelting slag are the value added products such as abrasive tools, roofing granules, road-base construction, railroad ballast, fine aggregate in concrete, etc., as well as the some studies have attempted to recover metal values from copper slag. This research was intended to recovery Fe-Cu alloy, raw material of zinc and produce reformed slag like a blast furnace slag for blast furnace slag cement from copper slag. As a results, it was confirmed that reduction smelting by carbon at temperatures above 1400°С is possible to recover pig iron containing copper from copper smelting slag, and CaO additives in the reduction smelting assist to reduce iron oxide in the fayalite and change the chemical and mineralogical composition of the slag. Copper oxide in the slag can be easily reduced and dissolved in the molten pig iron, and zinc oxide is also reduced to a volatile zinc, which is removed from the furnace as the fumes, by carbon during reduction process. When CaO addition is above 5wt.%, acid slag has been completely transformed to calcium silicate slag and observed like blast furnace slag.

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