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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 …
Moreover, the two most common substitution materials, ground-granulated blast furnace slag and fly ash are themselves by-products of primary steel production and coal power stations, both of which ...
Coal gasification fine ash (CGFA) is a large amount of solid waste produced by the coal chemical industry and has a broad prospect of recycling in building materials.This paper aims to investigate the effect of CGFA on the flowability, rheological behavior, hydration properties, and sustainability of blended cement.CGFA contains …
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 ...
In this study, a geopolymer having a nano-scaled structure was fabricated using recycling fly ash slag discharged from IGCC (Integrated Gasification Combined Cycle), to assess the possibility of employing it to replace high strength concrete. Strength, density, crystal phase, and bonding structure, …
Residual carbon can be recycled from the solid-waste gasification fine slag by froth flotation which is suspended into bio-oil to produce a new type of slurry fuel, so the …
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?
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 ...
1. Introduction. Coal gasification is an important method that cleanly utilizes coal resources. Unfortunately, coal gasification slag, a by-product of the gasification process, has long been regarded as a solid waste (Xue et al., 2023; Gao et al., 2023a).Approximately 33 million tons of coal gasification slag is produced annually in …
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 ...
Boiler slag is a coarse, granular, incombustible by-product of coal combustion and is thus classified as a coal combustion byproduct.It is angular, dense, and very hard.Boiler slag is only produced in a wet-bottom boiler, as this boiler has a special design that keeps bottom ash in a molten state until it is removed. Essentially, boiler slag is what bottom ash …
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 …
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 …
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 ...
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 …
Large amounts of lead slag are produced during the production of primary lead and secondary lead. Considering lead concentrate smelting as an example, a primary lead smelting system production of 1 t of lead will discharge 7100 kg of lead slag (Hou, 2011).At the secondary lead recycling process, for each ton of metallic lead produced, 100–350 …
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 …
Recycling of coal gasification fine slag as ultra-high capacity adsorbents for the removal of Rhodamine B dye: Graded synthesis method, kinetics and adsorption mechanism. Fuel (2023) Y.-P. Zhao et al. Removal of methylene blue by NaX zeolites synthesized from coal gasification fly ash using an alkali fusion-hydrothermal method, Desalination.
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 …
Two carbonation approaches are considered for studying the effects on the hardening mechanisms of slurries made of 100 wt% electric arc furnace steel slag (EAF) slag or 80 wt% EAF slag incorporating 20 wt% of Portland cement, which are applied during the hot-stage pretreatment with simulated gas for raw steel slag or the …
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 …
The mass production of steel is inevitably accompanied by large quantities of slags. The treatment of ironmaking and steelmaking slags is a great challenge in the sustainable development of the steel industry. Japan and China are two major steel producing countries that have placed a large emphasis on developing new technologies …
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 …
Coal ash, also referred to as Coal Combustion Residuals (CCR), is the material produced primarily from the burning of coal in coal-fired power plants. ... 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.
Recycling of Blast Furnace and Coal Slags in Aided Phytostabilisation of Soils Highly Polluted with Heavy Metals. ... (BFS) and coal slag (CS), with Dactylis …
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.
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 …
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 …
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 annually, and only …
Coal gasification coarse slag (CGCS) is solid waste generated during coal gasification. The mainly treatment method of CGCS is storage and landfill, which causes …
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. ...
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 ...
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 …