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Synthesis and mechanical properties of mullite ceramics with coal
With coal gangue and high alumina refractory solid wastes as raw materials, needle-like mullite powder, with an average diameter of about 1 μm, was synthesized at 1300°C by using the conventional solid-state reaction method. Mullite ceramics were derived from the inexpensive needle-like powder. Phase composition was examined by using X …
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High Strength Glass-Ceramics Fabricated With Coal Gangue …
Coal Gangue Bauxite Clay Steatite Limestone 1# 60 30 5 3 2 2# 55 35 5 3 2 3# 50 40 5 3 2 4# 45 45 5 3 2 5# 40 50 5 3 2 Mullite (Al 6 Si 2 O 13) generally has high strength and so was designed as main crystal phase. Combine with utilization rate of the coal gangue; the basic prescriptions were designed as listed in Table 2.
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Environment-oriented low-cost porous mullite ceramic
The XRD patterns of calcined coal gangue and bauxite are shown in Fig. 1.As shown in Fig. 1 a, the crystalline phases detected in coal gangue are quartz as major phase (SiO 2, hexagonal system, PDF# 850797) and potassium mica as minor one (KAl 3 Si 3 O 11, monoclinic system, PDF# 460741). Fig. 1 b presents that calcined bauxite mainly …
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Hydration mechanism and leaching behavior of bauxite
The hydration products of bauxite-calcination-method red mud-coal gangue based cementitious materials (samples O, A and B) have been investigated in our previous work [8]. In order to figure out the hydration mechanism of red mud-coal gangue based cementitious materials, it is necessary to summarize some of the important information …
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Preparation of Poly Aluminum-Ferric Chloride (PAFC) Coagulant …
However, coal gangue is a rejected resource of aluminum and iron, from which aluminum and iron ions can be extracted to expand the applications of gangue. It makes up for the lack of resources such as bauxite and iron ore. At the same time, the coal industry produces a large amount of wastewater that needs to be treated.
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Extraction of alumina from alumina rich coal gangue by a hydro …
The coal gangue generated from this area is thereby rich in alumina (Al 2 O 3, 40–50 wt%), which is almost the same as some middle and low-grade bauxite . Alumina mainly extracted from bauxite is widely used in catalysts, adsorbents, ceramics, refractory, metallurgy and many other areas [ 19 ].
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Hydration mechanism and leaching behavior of bauxite
A deep investigation on the hydration mechanism of bauxite-calcination-method red mud-coal gangue based cementitious materials was conducted from viewpoints of hydration products and hydration heat analysis. As a main hydration product, the microstructure of C-A-S-H gel was observed using high resolution transmission electron …
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Comprehensive utilization and environmental risks of coal gangue: A
Coal gangue has a wide range of applications in building material industry, energy industry, agriculture and other emerging industries, which are presented in Fig. 3. ... Alumina extraction from coal gangue could offer an alternative to bauxite as a source of alumina. Mechanically modification by grinding is an effective activation method to ...
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Extraction of valuable components from coal gangue through …
Coal gangue is mainly composed of aluminosilicates and organic carbon [23]. It contains 20–40 wt.% of Al 2 O 3 [24], which is equivalent to low-grade bauxite. In China, the bauxite resources are relatively scarce, the import dependence has exceeded 50% [25]. Coal gangue can be regarded as a potential alternative resource of bauxite [25].
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Synthesis and Mechanical Properties of Mullite Ceramics with Coal
For example, Ji et al. [18] found that mullite ceramics could be fabricated from coal gangue by adding γ-Al 2 O 3 and bauxite as aluminum sources, rendering excellent performance.
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Novel Process for Alumina Extraction via the Coupling Treatment of Coal
A novel process for the coupling treatment of coal gangue and red mud is reported. Red mud containing 23.4% Al2O3, 19.1% SiO2, and 9.4% Na2O by weight was used as the blended ingredients of coal gangue for alumina extraction. Calcination of coal gangue with the addition of Na2CO3 at 850 °C could obtain more than 90% of Al2O3 …
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A novel utilization of high-Fe bauxite through co-roasting with coal
High-Fe bauxite is a typical refractory bauxite with extensive resources, and coal gangue is a solid waste produced during coal preparation. In this study, the co …
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Facile preparation of zeolite-activated carbon composite from coal
During the process of coal mining, a large amount of associated resource (coal gangue) is generated and then discarded as one of the largest industrial solid wastes. Nowadays, it has accumulated 4.5 billion tons of coal gangue in China and 2 in China), but also pollutes the atmosphere, water body and soil [2]. The serious environmental …
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A prospective process for alumina extraction via the co-treatment …
1. Introduction. Coal fly ash (CFA) is one of the solid wastes produced from the coal-fired power plant, and the production of which is up to 600 million t/y in China resulting in serious environmental hazards (Li et al., 2015; Sun et al., 2017).Based on the fact that bauxite is in short supply, coal fly ash as a potential and economical source of alumina …
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Comprehensive utilization and environmental risks of coal gangue: A
Owing to kaolinite in coal gangue, extraction of alumina from coal gangue can replace bauxite as a source of alumina. When coal gangue were used to produce alumina and silicon, the contents of Al 2 O 3 and SiO 2 should be greater than 35% and 30%, respectively. It is difficult to directly extract the aluminum oxide and silicon dioxide …
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Managing Mining and Minerals Processing Wastes
with coal gangue solid waste 6.1 Introduction 6.1.1 Research background 6.1.2 Characteristics of coal gangue materials ... 7.3.2 The containment of bauxite liquor in red mud management facilities 7.3.3 Current lining technology for red mud disposal and bauxite liquor containment
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Study on Mechanical Properties of PET Fiber-Reinforced Coal Gangue …
The addition of 0.3% PET fiber can effectively increase the flexural strength of coal gangue fine aggregate concrete, which is 6.7% higher than that of CGC-5. However, when the fiber content increased from 0.3% to 0.5%, the compressive strength of concrete was reduced by about 8.1% compared with that of CGC-5.
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ReviewComprehensive utilization and environmental risks of coal …
The amount of coal gangue, a by-product of coal mining and washing, is rapidly increasing with the growing trend of energy consumption. The accumulated coal …
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Full article: Effect of Al (OH)3 addition on densification …
For example, Ji et al. [Citation 18] found that mullite ceramics could be fabricated from coal gangue by adding γ-Al 2 O 3 and bauxite as aluminum sources, rendering excellent performance. Liu et al. [Citation 19] used coal gangue and high alumina waste to produce ceramics with excellent properties and realized the resource utilization of coal ...
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Synthesis and characterization of low-cost zeolite NaA from coal gangue
As for pretreating the coal gangue, 600–800 °C for 2 h were appropriate condition to activate kaolin for zeolite NaA synthesized [29], meantime, the carbon can also be burned out completely in 800 °C for 2 h, as reported by Don et al. [20].Furthermore, the fabrication of high-quality zeolite requires proper alkalinity of the Na 2 O–Al 2 O 3 –SiO 2 …
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Hydration mechanism and leaching behavior of bauxite
PMID: 27131457. DOI: 10.1016/j.jhazmat.2016.04.040. Abstract. A deep investigation on the hydration mechanism of bauxite-calcination-method red mud-coal …
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A novel utilization of high-Fe bauxite through co-roasting with …
of stacked coal gangue solid wastes can serve as reducing agents for magnetization roasting of high-iron bauxite. Therefore, the creative utilization of two kinds of solid waste resources, coal gangue and high-Fe bauxite, is proposed through co-roasting in this paper. The carbon in coal gangue is used as a
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Pozzolanic behaviour of compound-activated red mud-coal gangue …
3.1. Mechanism of pozzolanic reaction in the red mud-coal gangue — lime system. To study the pozzolanic reaction mechanism of the compound-activated red mud-coal gangue, TG analysis was used to measure the amount of CaO consumed by the red mud-coal gangue at different hydration times. Fig. 5 shows the results for samples of …
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Environment-oriented low-cost porous mullite ceramic
Industrial coal gangue (after 800 °C calcination, Xiamen, Fujian Province, China) and calcined bauxite (after 1200 °C calcination, Gongyi, Henan Province, China) …
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Pyrite Transformation and Sulfur Dioxide Release during
A concern of this procedure is the emission of sulfur dioxide (SO2). In this work, the behaviors of SO2 release during coal gangue calcination under air atmosphere were systematically investigated ...
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A novel utilization of high-Fe bauxite through co-roasting with …
Abstract: High-Fe bauxite is a typical refractory bauxite with extensive resources, and coal gangue is a solid waste produced during coal preparation. In this study, the co-roasting …
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How To Effectively Use Coal Gangue?
There are several ways to use: 1. Recovery of coal and pyrite: Through a simple process, good coal is washed from coal gangue, low-quality coal is selected from it through screening, and pyrite is selected at the same time. Or recover pyrite, mixed coal and middling coal from the jig used for coal preparation ─ ─ plane shaker process.
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Mechanism of thermal activation on granular coal gangue and its …
Coal gangue (CG), a kind of rock in which the organic and inorganic components were co-deposited with coal during the coal forming process, is a solid waste discharged in the process of coal mining and washing. ... Hydration mechanism and leaching behavior of bauxite-calcination-method red mud-coal gangue based …
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Chen et al.
minerals, bauxite, pyrite, quartz, mica, feldspar, carbonaceous and plant fossils. Zheng, et al. [6] ... Coal gangue has its unique physical structure, chemical characteristics and gangue piling, which has caused different degrees of pollution and damage to the ecological environment of the mine.
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Hydration mechanism and leaching behavior of bauxite
Hydration mechanism. Based on our comprehensive investigations on the hydration characteristics of bauxite-calcination-method red mud-coal gangue based …
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