Coal gasification fine slag (FS) is a coal-based solid waste with high carbon content, and landfill-based disposal causes water-soil-gas composite pollution. Co-combustion is a common method of solid waste thermal disposal, and corn cob is used as an auxiliary fuel for co-combustion because of its energy density and ease of handling …

Coal gasification slag (CGS) is a typical solid waste from the coal gasification process. Reusing CGS into building materials is a key means of realizing its large-scale utilization. This study aims to utilize CGS at a large dosage for the preparation of nonburnt bricks.

Abstract. Background During an inspection by the Occupational Safety and Health Administration (OSHA) of a small coal slag processing plant with 12 current workers, four cases of pneumoconiosis ...

Interestingly in this study, crystallization behavior of coal slag during isothermal molten process was observed and shown in Fig. 3, which varied with molten slag temperatures. During the melting process, there was no cooling rate for the coal slag in this study, which was different from the experiment procedures of the Refs. [30], [31].

In the process of coal gasification, coarse and fine slags are produced. The coarse slag is directly discharged at the bottom of the gasifier; the fine slag enters the riser in the form of fly ash and is …

Gasification or combustion of coal and biomass is the most important form of power generation today. However, the use of coal/biomass at high temperatures has an inherent problem related to the ash generated. The formation of ash leads to a problematic phenomenon called slagging. Slagging is the accumulation of molten ash on the walls of …

A prior investigation at two coal slag processing facilities owned by the same company also resulted in elevated area samples but low personal dust samples. Area air sampling results from that investigation measured the highest levels of dust, silica, and metals inside the screen house. Because screening is a critical step in producing size ...

Owing to the material composition of the coal and the limitations of the current coal gasification technology, the solid waste of coal gasification slag would be generated during the gasification process. The coal gasification slag is divided into coal gasification coarse slag and CGFS (see Fig. 1) [6]. The CGFS in the two has a large loss of ...

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 …

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 …

According to Fig. 1, it can be found that the particle size of FS-A (D 50 = 351.30 µm) is significantly larger than FS-B (D 50 = 17.29 µm), which is because FS-A is the slag that settles first at the bottom of the settling tank in the process of CGFS collection. Both FS-A and FS-B are mainly composed of SiO 2, anorthite, tephrite, Fe 2 O 3 and …

Coal gasification is one of the most promising coal clean usage technologies, which can realize highly efficient and environmentally friendly coal …

The inorganic elements in coal are transformed to coal slag and are continuously tapped due to the force of gravity. To ensure a smooth slag-tapping process, the slag viscosity should be in the range of 2.5–25 Pa·s, and the tapping temperature range should be maintained [3,4,5,6,7].

In this work, the dissolution of Cr 2 O 3 into coal slag is calculated by FactSage software, and its impact on ash fusion temperatures and slag viscosity are investigated. The Cr 2 O 3 concentration of coal slag increases from 0.5 to 4 wt % as the operation temperature rises (1300–1600 °C). Cr 2 O 3 reacts with FeO to form the high …

Coal gasification slag (CGS) is a solid waste produced in the process of coal gasification reaction. Coal gasification is the process of reacting coal with gasification agents (hydrogen, air, oxygen, and water vapor) at a certain temperature and pressure to convert the combustible part of coal into combustible gas, while the ash in coal is …

Metallurgy: In the context of metallurgy, both coal and slag play important roles. Coal is often used as a reducing agent in the production of iron and steel, while slag is a byproduct of the steelmaking process. The choice between coal and slag in this context depends on the specific application and the desired properties of the final product.

product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, ... Keywords: slag, expanded slag, coal gasification slag, lightweight aggregates, gasification by-product utilization, waste utilization.

This gave rise to substitutes including coal slag. An Occupational Safety and Health Administration investigation in 2010 uncovered a case cluster of suspected pneumoconiosis in four former workers at a coal slag processing facility in Illinois, possibly attributable to occupational exposure to coal slag dust.

The authors would like to thank the coal slag processing facility employees for agreeing to participate in the NIOSH Health Hazard Evaluation Program. We would also like to thank Aleksandr Stefaniak, Brie Hawley, and Kristin Cummings from the NIOSH Respiratory Health Division for their scientific comments and thoughtful review of this …

Processing of coal gasification fine slag by different physical separation methods: Fate of typical heavy metals and comparison analysis on products | Semantic Scholar. DOI: …

The main elements included in the slag components are silicon, aluminum, cal-cium, and magnesium. Sulfur, potassium, sodium, titanium, and iron were present in quantities smaller than 1 wt %. The concentrations of soluble slag components in the filtrates of 10 and 50% suspensions were 1.41 and 3.47 g/L, respectively.

1. Introduction. Coal gasification slag (CGS) is a solid waste produced during coal gasification [1] and gasification converts flammable components into combustible gases such as H 2, CO, CH 4 [2].Coal gasification technology is considered as a major technology for efficient and clean coal utilization [3].Gasification techniques are classified …

Slag and Ash As discussed in the Background, solid waste from conventional pulverized coal-fired power plants is a significant environmental issue due to the large quantities produced, chiefly of coal fly ash, and the potential for leaching of toxic substances (e.g. heavy metals such as lead and arsenic) into the soil and groundwater at disposal sites, …

The composition of the ash and slag consists of high silica and aluminum content with lesser amounts of ferric oxide and calcium oxide (see Table 1).Because these components make up more than 90% of the total, we can assume that the properties of the ash and slag can be predicted from a four-component system SiO 2 –Al 2 O 3 …

In this work, the residual carbon in the entrained-flow gasification coal fine slag was enriched via employing a combination of ultrasonic pretreatment and wet sieving process, along with …

This is the first known report of lung disease in workers processingcoal slag and raises concerns for workers exposed to coal slag dust. BACKGROUND During an inspection by the Occupational Safety and Health Administration (OSHA) of a small coal slag processing plant with 12 current workers, four cases of pneumoconiosis were identified …

This paper reviews the content, compositions, and melting characteristics of ashes in differently ranked coal and biomass, and discusses the formation …

We took air samples for the analysis of dust, silica, and metals to investigate respiratory concerns. Overall, copper slag processing produced higher levels of dust, silica, and metals compared to coal slag processing, but both processes posed health risks. We recommend employee exposure monitoring and a formal respiratory protection program.

Maximizing the use of valuable components in coal gasification slag is of great significance for resource recovery and the environment due to the huge annual emission of coal gasification slag. This study successfully produced Si-Fe-Al-Ca alloy with a composition of 63.83 wt% Si, 19.73 wt% Fe, 7.09 wt% Al, 6.32 wt% Ca, 1.70 wt% Ti, 0.03 wt% P ...

BLACK BEAUTY. Abrasive. This coal slag quickly cuts through surfaces faster than other abrasives while being environmentally friendly and leaving minimal dust with low free silica attributes (contains less than .01% free silica). BLACK BEAUTY® Abrasive black boiler slag is a highly effective blasting medium with a lower cost, making it a more ...