The present study firstly proposed a method of integrated utilization of sewage sludge (SS) and coal gangue (CG), two waste products, for cement clinker products with the aim of heat recovery and environment protection. The results demonstrated that the incremental amounts of …
Home Browse by Title Proceedings ICDMA '10 Recycling Coal Gangue as Raw Material for Portland Cement Production in Dry Rotary Kiln. ARTICLE . Recycling Coal Gangue as Raw Material for Portland Cement Production in Dry Rotary Kiln. Share on. Authors: Guohua Qiu. View Profile,
Mar 01, 2016· Coal provides around 90% of the energy consumed by cement plants around the world, despite the environmental harm caused by its combustion. It takes 200 - 450kg of coal to produce 1t of cement. The cement industry consumes around 4% of global coal production, around 330Mt/yr. Given the rapidly-expanding infrastructure projects underway around ...
Coal gangue is a kind of solid waste discharged from coal mining and coal washing. It is a kind of black-gray rock with low carbon content and harder than coal, and it has low calorific value. Coal gangue can be used for building materials such as...
tamil nadu pulverizing production line processing coal gangue; ... Production Line Side length from 100 to 500 mm below the material the compressive strength of up to 350 MPa Limestone coal gangue river pebbles granite iron ore and so on Depending on the process customization Production . ... Cement Grinding Station CHAENG ...
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Apr 07, 2016· SS and CG in cement industry, which can save energy and resources, and improve trace elements immobilization at the same time. 2. Experimental Section 2.1. Materials Characterization The dried sewage sludge pellet and coal gangue samples were collected from a municipal wastewater treatment plant located in Beijing, China.
Jun 08, 2016· Coal gangue, an industrial solid waste discarded from coal mining and processing, was used as the sole raw material to prepare brick. The coal gangue was crushed, homogenized, milled and then pressed into green compacts. The dried compacts were sintered at different temperatures for 2 h. The obtained brick samples were characterized with X-ray diffraction, scanning electron microscopy, …
Feb 08, 2021· Furthermore, the application of DCP was limited by its low hydration reactivity, as indicated by the lower strength compared with the fresh cement . Coal gangue (CG) is a residue abandoned coal with the colour varying from grey to grey-brown and brown-black . As the leading solid waste in coal mining, the traditional disposal of CG by spreading ...
Jan 20, 2016· Currently, coal gangue is primarily utilized in the following aspects: power generation, agricultural fertilizer, highway roadbeds, mined land reclamation backfill, brick production, cement production, and concrete production (Hao and Wang, 2009, Liu and Liu, 2010, Yu et al., 2012).
Cement production also is a key source of CO2 emissions, due in part to the significant reliance on coal and petroleum coke to fuel the kilns for clinker production. Globally, CO2 emissions from cement production were estimated at 829 MMTCO2 in 2000 7, approximately 3.4% of global CO 2 emissions from fossil fuel combustion and cement production.
Many researches on coal gangue are aimed at increasing its activity by many methods together such as thermal, mechanical and chemical. The methods are so complex that they are difficult to be adopted by some companies. In this paper, considering the low-strength requirement of cement mortar, the activity of coal gangue is more evidently shown by Ca(OH)2 activator.
Abstract Coal gangue is the main industrial solid waste that is physically separated from bulk coal during coal preparation. In China, the deposition amount of coal gangue is over 500 million tons with an annual production of more than 70 million tons. Extensive studies have been carried out to find a feasible way to reuse coal gangue in cement-based material in order to reduce its ...
2.3. Test Methods 2.3.1. Experimental Study on Compressive Strength of Coal Gangue Concrete. The compressive strength of concrete was tested according to "The Standard for Test Methods of Mechanical Properties of Ordinary Concrete" (GB/T50081-2019) [].In this test, cube specimens with a size of 100 × 100 × 100 mm were used, and each group was poured with 3 pieces.
Jan 01, 2021· Moreover, coal gangue and bauxite were mixed at a ratio of 4:1 to pave roadways (Cai and Liu, 2020). However, due to the weak cementitious ability of coal gangue, the usage of coal gangue to replace Portland cement in concretes is generally less than 15% (Li et al., 2006). Therefore, it has become an important issue to increase the usage level ...
The recycled coal can be used for power boiler fuel, washed gangue can be used for construction materials, and pyrite can be used as chemical raw materials; 4. To produce building materials: Using coal gangue for brick production instead of clay as a raw material, by this way, can reduce fertile land dig;
A wide variety of coal gangue block machinery options are available to you, such as 1 year, 5 years, and 2 years. You can also choose from pakistan coal gangue block machinery, as well as from easy to operate, long service life, and multifunctional coal gangue block machinery, and whether coal gangue block machinery is concrete, cement, or clay.
Equipment needed. No matter the gangue used for brick production, coal and pyrite recycling, or making cement additive and supplying to coal gangue power plant, the normal used processing equipments are jaw crusher, impact crusher, SCM Ultra fine grinding mill, overpressure trapezium mill, MTW European type Trapezoid mill, vibrating screen, vibrating feeder and so on.
Coal gangue-based cemented backfill material (CGCBM), which is an engineered mixture of crushed coal gangue, fly ash, cement, and water, is designed for mine backfill [6–8]. It effectively solves the problems of coal gangue stacking and surface subsidence [9, 10].
May 15, 2020· It is a promising and effective method for waste treatment by using coal gangue to make lightweight aggregate concrete. However, lightweight aggregate concrete with low-density coal gangue ceramsite is prone to cracking during volume shrinkage, which limits its application in the construction industry. In an attempt to resolve the problem of cracking in shrinkage, this study investigated the ...
Coal gangue is a kind of black and gray rock associated with the coal layer in the process of coal-forming. It contains small quantity of coal and is harder than coal. The coal gangue is mainly applied to produce light aggregates of gangue cement & concrete, …
Abstract . Six kinds of cement raw material were matched to use different coal gangues and different limestones in order to obtain the calcine thermal condition and the reasonable prescription of the gangue instead of clay ingredient which was applied to the cement production.
4. To make building materials with coal gangue. In recent years, it develops rapidly to produce building materials with coal gangue. As far as the current utilization situation of coal gangue, the more mature approach is to make bricks, hollow block, cement raw materials, and lightweight aggregate. 5. Coal gangue is used to generate electricity
Jun 24, 2021· 2. Alkaline Dry Powder-Activated Coal Gangue-Based Geopolymer Concrete 2.1. Preparation Techniques (1) Coal gangue and fly ash required for preparation: the coal gangue in the experiment is the spontaneous combustion coal gangue of Gaode Mine in the Fuxin City, Liaoning Province, and its chemical composition is shown in Table 1.The fly ash of grade I in Fuxin Power Plant …
The utilization of calcium raw materials other than calcium carbonate can reduce the Raw material CO 2 of cement industry [57,58]; red mud, tailing and coal gangue can be used as silicate and ...
Abstract Fly ash (FA) and gangue are common solid wastes. In this study, coarse aggregates were replaced with coal gangue at a constant substitution rate of 40% to promote the application of coal gangue in concrete production. The modification effect of FA content on the working and mechanical properties of coal gangue concrete (CGC) and its modification mechanism were revealed.
Apr 07, 2016· During the calcinations, most of trace elements could be immobilized especially Zn and cannot be easily leached out. Given the encouraging results in the present study, the co-process of sewage sludge and coal gangue in the cement kiln can be expected with a higher quality of cement products and minimum pollution to the environment.
Life cycle assessment (LCA) was carried out to quantify and analyze the environmental impact and benefit caused by the utilization of coal gangue as alternative raw material and fuel in cement clinker production. The optimal dosage of coal gangue was determined by comparing among different mixing amount scenarios and Portland cement clinker (clinker without adding any waste) considering the ...