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Coal gangue, one of the main hazardous emissions of purifying coal from coalmine industry, is rich in silica and alumina. However, the recycling of the waste is normally restricted by less efficient techniques and low attractive output; the utilization of such waste is still staying lower than 15%. In this work, the silica aerogel materials were synthesized by using a precursor extracted from ...
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Coal gangue is a kind of industrial solid waste that is discharged when coal is excavated and washed during the production process. The quantity discharged can take up .
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Coal gangue aggregate was employed as highgrade railway subgrade filler andprepared concrete for roadbed drainage (named coal gangue roadbed protecting concrete—CGRPC). First, the basic properties of coal gangue such as particle size distribution, ignition loss, strength change under water softening, and compression performance were measured. Then, the technology to use coal gangue .
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· Coal gangue, which refers to the solid waste (silicaalumina waste) discharged during coal mining and coal washing processes, has become one of the largest industrial solid wastes in China, India, Australia and South Africa. The studies on alkaliactivated .
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The odd axes resist pressure intensity with large quantity coal gangue was discussed and experimented on fly ash and coal gangue gel filling body between different concentration, proportion and...
WhatsApp Hydration Characteristics of IntermediateCalcium Based Cementitious Materials from Red Mud and Coal Gangue: Na ZHANG 1,Xiaoming LIU 2, ** (),Henghu SUN 1, 3: 1. Green Construction Materials and Circulation Economy Center, Architectural Design and Research Institute of Tsinghua University Co., Ltd., Beijing 100084 2. School of Metallurgical and Ecological Engineering, University of Science and ...
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After the threestage closed loop treatment, the coal gangue meets the further processing requirements of the building first,jaw crusher for primary,impact crusher or cone crusher for secondary,vertical impact crusher for sand making and shaping,the crushing and screening process of coal gangue is completed by the classification of the circular vibrating screen.
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The invention relates to a preparation method of multiphase gel for controlling the spontaneous combustion of coal. The multiphase gel with multiple components of medium is made by adding a slight amount of thickener into the fly ash or the yellow mud slurry to form thickening mud with certain viscosity, adding certain amount of crosslinking agent and ing agent into the ...
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· Mechanical strength, hydration rate, gel pores, total porosity: The cement with 30% gangue in 700 °C displayed the best performance. Xu (1997) cement: 800 °C: 60%: Durability: In the help of activator, the cement with 60% coal gangue was successfully developed : Ren et al. (2017) concrete —— 30–50%: Compressive strength: The coal gangue concrete has a good strength performance. .
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· Coal gangue, which refers to the solid waste discharged during coal mining and coal washing processes, is one of the largest industrial solid wastes in China. It accounts for 10%–25% of the total amount of coal mining,,. So far, China has accumulated more than 7 billion tons of coal gangue.
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· In order to compare the CASH gel of red mudcoal gangue based cementitious materials with the CSH gel of OPC, HRTEM observations were also performed on the 28day hydrated pastes of OPC specimen (95% clinker + 5% gypsum) and sample O, and the corresponding images are displayed in Fig. 5, Fig. 6, respectively.
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fiber by using sol‐gel method. The authors also studied flexural strength of the sintered mullite ceramics. There have been reports to synthesize mullite from coal gangue or fly ashes. 16,17 Jingjing Shi et al extracted mullite from fly ash, which also showed that it was possible to prepare mullite from coal Yingde Li et al successfully prepared mullite powder by the ...
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Coal gangue is the solid waste produced in coal mining. In countries with developed coal resources, such as China, India, Australia, Germany, the United States and South Africa, the discharge of coal gangue waste remains high. Waste storage generated from .
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Download Citation | Hardening mechanisms of alkali activated burned gangue cementitious material | The hydrated product and the activated progress of burned coal gangue with highly alkaline ...
WhatsApp Synthesis of zeolites via coal gangue can contribute to resource recycling and environmental protection. In this study, highsilica SSZ13 was synthesized by onestep hydrothermal synthesis from coal gangue without the traditional pretreatment methods of hightemperature roasting and alkali melting, making it more convenient and energy efficient. The synthesis time, gel silicon–aluminum ...
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Facile preparation of SiO2Al2O3 aerogel using coal gangue as a raw material via ambient pressure drying method and its application in organic solvent adsorption . November 2015; RSC Advances 5 ...
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Previous research shows [4], the bonding of gel role of fresh coal gangue is very weak, because this kind of coal gangue have steady crystal structure, whose atom, ion, and member etc. are put according to certain law by order, even if its chemical composition is proper and lowly active, however, coal gangue has certain activity after burning. After calcined at a certain temperature, the clay ...
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· Coal gangue, which refers to the solid waste (silicaalumina waste) discharged during coal mining and coal washing processes, has become one of the largest industrial solid wastes in China, India, Australia and South Africa. The studies on alkaliactivated materials have mainly focused on fly ash, slag and metakaolin.
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· The results showed that the ultrasonic pretreatment of coal gangue time 1 h and the gel Si/Al radio of 15 were optimal. The better crystal grains of SSZ13 could be formed from coal gangue at 18 h crystallization time under this condition, which was 12 h shorter than chemical under the same conditions. This study provided a reference direction for the environmentally friendly application of ...
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· The odd axes resist pressure intensity with large quantity coal gangue was discussed and experimented on fly ash and coal gangue gel filling body between different concentration, proportion and .
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· The results show that the red mudcoal gangue based cementitious materials mainly form fibrous CASH gel, needleshaped/rodlike AFt in the early hydration period. With increasing of the hydration period, densification of the pastes were promoted resulting in the development of strength. EDS analysis shows that with the Ca/Si of red mudcoal gangue based cementitious materials increases, .
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Coal gangue can cause significant heavy metal pollution in mining areas, which would have a negative impact on the environment and human health. The objective of this research is to investigate the relationship between expansive soil amount and the leaching behavior of Chromium from coal gangue and the engineering properties of coal gangue used as building materials.
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Coal gangue is the main discharged solid waste during coal mining and washing, which accounts for the 10–25% output of the raw coal [1]. The amount of coal gangue in China has already reached billion tons and the stockpile of gangue is increasing at a rate of billion tons per year [2]. The accumulation of coal gangue not only takes up ...
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Facile preparation of a SiO 2 –Al 2 O 3 aerogel using coal gangue as a raw material via an ambient pressure drying method and its application in organic solvent adsorption. Jinmeng Zhu a, Shaohui Guo a and Xuanhua Li * ab a State Key Laboratory of Solidification Processing, Center for Nano Energy Materials, School of Materials Science and Engineering, Northwestern Polytechnical University ...
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