Enhancement of coal gangue performance by surface micro …
1. Introduction. Coal gangue is a by-product of coal mining and washing process (Li et al., 2006).In China, there are 5 billion tons of coal gangue accumulated as residual waste, and this value continues to grow at the rate of 300–350 tons per year (Li and Wang, 2019; Moghadam et al., 2019).Large amount of coal gangue not only occupies …
Article Properties and Hydration Mechanism of Cementitious …
First, this part investigated the effect of mixing only calcined coal gangue on the strength of cementitious materials. The changes in compressive strength of the gelling material at 3, 7, and 28 days with different amounts of calcined coal gangue are shown in Fig. 3.The addition of calcined coal gangue led to a significant decrease in the 3-day compressive …
CN218095902U
The utility model relates to a gangue calcination technical field specifically is an integration calcining device for gangue raw material fuel, the device comprises a device main part, the outer wall fixedly connected with feeder of device main part, first motor is installed to the outer wall of device main part, the output of first motor passes through driving medium …
Activity and structure of calcined coal gangue
Coal gangue was activated by means of calcination in seven temperature ranges. Systematic research was made about activation mechanism and structural evolution. Glycerin-ethanol method, SEM, MIP and XRD were used to determine the variation of …
(PDF) Thermal Activation of High-Alumina Coal Gangue …
Thermal Activation of High-Alumina Coal Gangue Auxiliary Cementitious Admixture: Thermal Transformation, Calcining Product Formation and Mechanical Properties December 2023 DOI: 10.20944 ...
CN102553882A
The invention relates to an energy-saving calcining method for increasing activity of coal gangue, comprising the following steps of: (1) crushing, grinding and pyrolyzing the coal gangue; (2) performing useful constituent extracting and solid-liquid separation on material to be activated, putting the solid in a primary burning furnace to burn, obtaining gangue …
Iron conversion and ammonium salt calcination whitening process …
1. Introduction. Coal gangue is the largest solid waste generated from the coal production process, with a high content of clay minerals, carbonaceous, quartz, and pyrite (Li et al., 2010, Li et al., 2006).The accumulation of coal gangue results in serious environmental problems and geological disasters (Li and Wang, 2019).Therefore, it is …
Activation calcining method for coal gangue
The invention relates to a coal gangue activation calcining method, which comprises the working procedures of grinding, pelletizing and calcining, wherein coal gangue and calcium-containing substances are ground and refined to obtain a coal gangue mixture, the coal gangue mixture is screened, and the screened coal gangue mixture is taken out; …
Thermal Activation of High-Alumina Coal Gangue Auxiliary
In this paper, a new preparation technology is developed to make high-alumina coal gangue (HACG) auxiliary cementitious admixture by calcining HACG …
Mineral phase transformation in coal gangue by high …
The valuable components of alumina and silica in coal gangue mainly come from kaolinite. As shown in Fig. 2 [23], kaolinite is a typical layered silicate material, …
CN1124724A
The method for preparing cement admixture by calcining coal gangue features that coal gangue and other raw materials are burnt at 1000-1500 deg.C for 6-10 hr in a kiln, then quickly cooled, and finally ground along with cement clinker. Said kiln is a vertical elliptic one including bottom air channel, igniting material layer, coal feeding layer and water …
CN202868672U
The utility model provides a coal gangue fluidized slow-release combustion calcining furnace, comprising a furnace body (1), wherein a heating sleeve (2) is arranged in the furnace body; the lower part of the heating sleeve is provided with a high-temperature gas inlet (4), and the upper part of the heating sleeve is provided with a waste gas outlet (5); …
Prediction of coal gangue volcanic ash activity based on …
Designed a set of 360 variable experiments to analyze the strength of coal gangue cement. ... the activation test process becomes both cumbersome and time-consuming. These factors limit the resourceful application of CG. ... researchers have found that after calcining the coarse aggregate made from CG at 750°C, ...
CN102527692B
The invention relates to a method for activating coal gangue without calcining. The method comprises the following steps of: (1) crushing coal gangue to obtain coal gangue with particle size smaller than 2mm; (2) controlling the water content of the crushed coal gangue below 1%; (3) burdening coal gangue of different qualities with auxiliary agents …
CN115650618A
The invention belongs to the technical field of coal gangue production, and particularly relates to a low-carbon environment-friendly coal gangue suspension calcining method and a process system, wherein the low-carbon environment-friendly coal gangue suspension calcining method comprises the following steps: the method comprises the …
CN101028935A
A process for extracting aluminum hydroxide (or oxide) from coal gangue and using the residual dregs to prepare cement includes such steps as calcining coal gangue, mixing with lime or calcium carbide dregs and water, steam pressure reaction to generate the resultant containing hydrated calcium silicoaluminate and calcium hydroxide, calcining …
Influence of Curing Temperature on the Performance of Calcined Coal
The utilization of calcined coal gangue (CCG) and limestone for the preparation of blended cement is an efficient approach to address the issue of coal gangue disposal. However, the compressive strength development of blended cement is slow, particularly at high substitution levels of CCG. Therefore, this study aimed to promote …
Mechanism of thermal activation on granular coal gangue …
Coal gangue (CG) is a kind of solid waste discharged from the process of coal mining and washing without efficient utilization. Motivated by using the CG as supplementary cementitious materials (SCMs) for the partial substitution of cement, the CG was thermally activated via calcining under high temperature and the corresponding …
CN102167532A
The invention relates to a concrete admixture, Which is made from a A component and a B component by steps of mixing, calcining and grinding; the A component includes following raw materials: coal gangue of 70 to 90 amounts by weight; limestone of 10 to 30 amounts by weight; gypsum of 2 to 5 amounts by weight; fluorite of 0.5 to 1.5 amounts by weight; …
CN103864325B
A production system for suspended state calcining coal gangue, comprising: to preheater quantitatively, the raw material of stably supplying coal gangue powder prepares and feeding subsystem; Material is preheated to design temperature under suspended state and in decomposing furnace, decomposes the preheating of burning till and subsystem …
Activity of calcined coal gangue fine aggregate and its effect …
For the qualitative analysis of coal gangue fine aggregate in the calcining process, the changes of the active component, original state, and calcined …
Preparation and characterization of ZSM-5 molecular sieve using coal
The untreated coal gangue raw materials, the coal gangue samples calcined at N 2 550 °C, the samples calcined, and acid leached, and the samples calcined, acid leached, and alkali fusing were named as samples a, b, c and d respectively. 2.3. Synthesis of ZSM-5 molecular
Comprehensive utilization and environmental risks of coal …
When the weight ratio of Na 2 CO 3 to coal gangue was 0.8–1 after calcining in 800 °C–900 °C, the alumina extraction ratio from coal gangue reached …
Research on the hydration process of cemented coal gangue …
Coal gangue was obtained from the Guanyao Coal Mine, Yuci District, Shanxi Province. Fly ash was obtained from a power plant in Taiyuan, Shanxi Province, China. The coal gangue was crushed and processed into three particle-size ranges: fine gangue (0–5 mm), medium gangue (5–10 mm), and coarse gangue (10–15 mm). The. Radon concentration
Reaction mechanism of metakaolin materials prepared by calcining coal
Results showed that after calcining with mineral powders, the crushing rate of coal gangue decreased from 16.8 % to 16.1–13.2 %, and water absorption decreased from 5.29 % to 2.74–3.90 % ...
Reutilisation of coal gangue and fly ash as underground …
The coal gangue and fly ash used in the experiments were collected from a gangue dump and a power plant in the Coal Mine, respectively. In practical applications, due to the limitations of the backfill process and equipment, only gangue with a particle size of 50 mm or less is generally used for backfill (Li et al., 2017, Li et al., 2017). ...
Iron conversion and ammonium salt calcination whitening process …
The optimal whitening process of coal gangue by ammonium salt calcination is obtained. ... Therefore, this work is designed to achieve the decarbonization and iron removal of coal gangue via calcining different types of ammonium salts. The influences of pre-calcination temperature, ammonium salt type and dosage, and calcination …
System and method for calcining coal gangue
A technology for calcining coal gangue and coal gangue, which is applied in the system field of calcining coal gangue, and can solve the problems of complex organization of crushing, calcining process and high energy consumption in the calcining process ... It can be seen that the above-mentioned calcination process generally needs to grind ...
Influence on Activation Property of Coal Gangue by Calcining …
Influence on activation property of coal gangue by calcining temperature was discussed. The experimental results show that C(12)A(7) and C2S with hydraulic-activity are created in coal gangue ...
Efficient removal of water pollutants by hierarchical porous zeolite
The annealing process could be merged into the calcination activation process of coal gangue, and no additional process would be added. In this paper, zeolite-activated carbon composite is successfully prepared through a facile calcining process following a hydrothermal process, in which coal gangue is used as silicon and …