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Introduction. Coal-based direct reduction (CBDR) in iron ore smelting, emerging as a prominent method in the mid-20th century, represents a significant evolution in response to energy crises and environmental concerns, entails the removal of oxygen from solid iron ore to produce solid sponge iron that can be used in electric arc furnace …
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Coal gasification fine slag (FS) is a typical solid waste generated in coal gasification. Its current disposal methods of stockpiling and landfilling have caused serious soil and ecological hazards. Separation recovery and the high-value utilization of residual carbon (RC) in FS are the keys to realizing the win-win situation of the coal chemical …
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According to the Ministry of Natural Resources and Environment of Russia, Russian coal-. fired power plants produce 22 million tons of coal ash and slag …
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In this study, the Si–Fe–Al–Ca alloy was successfully smelted in the electric arc furnace and a new process for recycling coal fine gasification slag was proposed. The reactivity of residual carbon in coal gasification slag is high according to the fact that the alloy yield was increased from 20.53% to 67.78% by using the residual carbon ...
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Recycling of Blast Furnace and Coal Slags in Aided Phytostabilisation of Soils Highly Polluted with Heavy Metals. ... (BFS) and coal slag (CS), with Dactylis …
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Regulatory guidelines for recycling of coal combustion byproducts have developed and evolved over the past few decades. The US EPA conducted two regulatory determinations on the management and use of coal combustion byproducts in 1993 and in 2000. ... Boiler slag. American Coal Ash Association; Aurora, CO: 2004 August. Resource Bulletin 23 ...
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Coal gasification fine slag (CGFS) is a significant source of solid waste requiring improved treatment methods. This study primarily investigates the mechanism of ultrasonic treatment in optimising flotation-based decarbonization of CGFS and its impact on CGFS modified with surfactants. The objective is to maximise the carbon ash …
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The three kinds of coal gasification fine slag can be separated to different extents in terms of HHS, carbon elements enriched in concentrates, and metal elements …
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The addition of blast furnace slag into cement avoids a part of limestone and coal extraction and makes it possible to diminish the CO 2 emissions that cause environment pollution. It is important to have in mind that blast furnace slags present particular hydraulic properties. ... Slag recycling in the steel job constitutes a relevant …
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Coal is the dominant fuel in China to provide primary energy, and 70% of polyvinyl chloride is produced from coal-based CaC 2.CaC 2 reacts with water to produce acetylene and calcium carbide slag (CCS) as a solid waste for polyvinyl chloride production. Approximate 40 million tons of dry CCS are generated annually in China, among which …
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CaO-containing carbon pellets (CCCP) was prepared by mixing carbide slag (Ca(OH) 2) and powdered char to produce CaC 2, achieving the recycling of carbide slag during CaC 2 production process. The thermal strength of CCCP was the focus of most attention when employing arc furnaces as reactors for CaC 2 production in industry. To …
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Advanced CGFS conversion technologies from laboratory to the plant should be pushed for recycling utlization. Abstract. ... The high value of coal gasification slag and the trend towards functional use of its resourcefulness. The fractional utilization of the carbon and ash components of the gasification slag is a prerequisite for its solid ...
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1. Introduction. The treatment of industrial solid waste (e.g., coal gasification slag (CGS) [1]) and dyeing wastewater [2] is crucial for environmental protection, human health and sustainable development. Harmful substances contained in the industrial solid waste and wastewater, if improperly discharged, would seriously pollute the soil, water and air, and …
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SEM, particle size analysis, and contaminant content of coarse coal gasification slag (CCGS) produced by Shenhua Xinjiang Chemical Co., Ltd. were measured, respectively, and the physicochemical properties of the soil after improvement using gasification slag were investigated in this paper. The results showed that the slag …
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Coal gasification coarse slag (CGCS) is solid waste generated during coal gasification. The mainly treatment method of CGCS is storage and landfill, which causes …
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Coal gasification slag (CGS) contains variable amounts of heavy metals, which can negatively impact the environment. The mineral composition, element distribution, occurrence, and leaching characteristics of heavy metals in coal gasification coarse slag (CGCS) and coal gasification fine slag (CGFS) are studied to explain the …
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Benefits of Slag Utilization Some of the perceived advantages of using the slag by-product, ... Helps the economic competitiveness of coal, ... and requests for specific uses are handled on a case-by-case basis or under generic state recycling laws or regulations. Legal barriers include contract, patent, liability and some regulatory issues. ...
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Coal gasification fine slag (CGFS) was collected in an entrained flow coal gasification unit from a modern coal chemical base, Ningxia, China. CGFS was firstly dried at 105 °C for 12 h to remove moisture, then ground and collected samples of 60–120 μm …
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Coal ash and slag waste are the products of coal processing that can be recycled into other useful products, but most part of them is accumulated in dumps which causes several environmental ...
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Iron recovery from a lead slag in Henan province was carried out with the technique of coal-based direct reduction followed by magnetic separation. Scanning electron microscopy (SEM) was used to investigate the transformation of iron-containing minerals and the particle size of metallic iron generated by coal reduction. The results …
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Fine slag (FS) is an unavoidable by-product of coal gasification. FS, which is a simple heap of solid waste left in the open air, easily causes environmental pollution and has a low resource utilization rate, thereby restricting the development of energy-saving coal gasification technologies. The multiscale analysis of FS performed in this study …
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In China, hundreds of million tons of gasification slag was produced from coal gasification in 2015 [1]. ... This means that if residual carbon in fine slag is selected as a recycling fuel, the overall energy efficiency of the gasification process will be significantly improved. Hence, the efficient flotation to separate and enrich the carbon ...
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During the blast furnace process limestone (CaCO 3) flux is added, to collect the waste products produced: silica (SiO 2), phosphorus pentoxide (P 2 O 5), calcium sulfide (CaS), magnesia (MgO) and alumina (Al 2 O 3).This forms blast furnace (BF) slag, which floats on top of the surface of the hot metal (Peters, 1982).The blast furnace is …
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Boiler Slag, molten bottom ash from slag tap and cyclone type furnaces that turns into pellets that have a smooth glassy appearance after it is cooled with water. ... This final rule supports the responsible recycling of coal ash by distinguishing beneficial use from disposal. Why do companies recycle and reuse coal ash?
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As the leading industry of coal chemical industry, Coal gasification plays an important role in efficient and clean utilization of coal. It is a process in which solid fuels …
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Section snippets Characteristics of residual carbon in coal gasification slag. As a by-product of the coal gasification process, coal gasification slag is mainly composed of two parts, namely coarse slag (CS) and fine slag (FS) (Krishnamoorthy and Pisupati, 2015, Li et al., 2022, Li et al., 2022).The mineral composition of fine slag is more similar …
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In this study, the Si–Fe–Al–Ca alloy was successfully smelted in the electric arc furnace and a new process for recycling coal fine gasification slag was proposed. …
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Coal gasification slag can be divided into coarse and fine slag. Coarse slag is water-bearing and is discharged by the lock bucket at the bottom of the gasifier after the melting, cooling and condensation of coal particles under high temperature and high pressure. ... Coal combustion residues—Environmental implications and recycling ...
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Iron- and steelmaking processes create slags, valuable by-products. Industrial utilisation of slag as a lower-value secondary mineral source has been established for decades. Slag heat recovery is an ongoing research topic and has the potential to maximise energy efficiency in iron and steel production. Heat recuperation …
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What is coal slag? This stuff is boiler slag, which is a recycled product from coal burning plants. When coal is "fired" at over 2500 degrees it melts and produces a by-product called slag. When the slag is cooled through a process called vitrification, it crystallizes, forming sharp, angular granules in a variety of sizes.
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