Sulfur removal was highest at low solvent density and high temperature, ranging, for 15 min reaction time, from 34 to 53% on a feed-to-product basis, or up to 66% if loss of coal is allowed for. Initial results obtained with a semicontinuous reactor are briefly summarized, as well as recent work on oil agglomeration at low oil levels followed ...
development and some of these processes are also capable of removing organic sulfur from coal, which is beyond the removal ability of any physical beneficiation processes. It is noted that most chemical coal cleaning processes can remove as much as over 90% of pyritic sulfur and several can extract up to 40% of the organic sulfur from the ROM coal.
A novel experiment was carried out for the removal of organic sulphur by the electron transfer process. In these experiments, the effect of conventional and microwave …
leaching, mineral beneficiation and coal desulfurization. The iron-sulfur oxidizing microorganisms are widely studied ... to evaluate the organic sulfur removal efficacy of the A. fer-
Unlike inorganic sulfur, only part of organic sulfur could be removed by oxidation. Baruah et al. [28] removed sulfur from high sulfur coal in a H 2 O 2 and HCOOH mixed system, whereby the inorganic sulfur was removed completely, however, the organic sulfur removal rate was merely 33 %. Demirbas [29] used prussian blue to …
The chemistry of sulfur is so complex that it greatly complicates the removal of sulfur from coal. Sulfur is found in two forms in coal: (1) inorganic sulfur, and (2) organic sulfur [4]. Sulphate-sulfur occurs in combination with either Ca or Fe. Pyritic-sulfur refers to iron disulfide (FeS 2) as pyrite, marcasite and melnikovite-pyrite ...
Further, Se is consistently associated with organic matters (57.1%) and silicates (24.5%) in the raw coal (Fig. 4). After coal beneficiation, the fractionation profile of Se speciation for the middlings and coal slime is similar to that of the raw coal where the organic-bound Se is dominant; whereas the coal gangue contains the lowest organic ...
This article covered the development of chemical desulfurization technologies for organic sulfur coal, including acid and alkaline leaching, peroxyacetic …
Organic sulfur is found in coal as mercaptans (RSH), disulfides (RS-S-R'), sulfides (R-S-R'), and thiophenes (heterocyclic). Organic sulfur is thus integrated into the carbon structure and difficult to remove. Oxidative ions convert organic sulfur to sulfates which can be dissolved in water or form sulfur dioxide.
Request PDF | Organic sulfur and hap removal from coal using hydrothermal treatment | Coal is still the major source of power for electrical generation worldwide and will continue to be in the ...
Suitable for beneficiation of coal fines and removal of magnetic particles from coal ash. ... [101] described that the organic coal molecules are held into the micropores by a network of electron donor and acceptor (ED/A) interactions. To extract the coal molecules from pores, the ED/A complexes between the molecule and network …
Coal with low ash content, high sulfur content, and high organic sulfur Responsible editor: Philippe Garrigues * Baisheng Nie bshnie@163 content is generally referred to as low-quality coal ...
Coal beneficiation is one of the most effective methods for removing minerals (such as gangues and pyrite) and pollutants (such as sulfur) before the burning of coal. ... Based on microbial cultures (such as Thiobacillus ferrooxidans), up to 90% of inorganic sulfur can be removed while the removal of organic sulfur is difficult to …
1. Introduction. The organic sulfur in low rank coal is difficult to remove. However the sulfur has harmful effects on coal utilization, such as burning and coke making (Pohlmann et al., 2016, Dolhyi et al., 2000).Generally, sulfur removal during coal combustion is effective but it needs more economic investment (Cheng et al., 2003).In …
The desulfurization method for Illinois No. 6 coal was capable of reducing significant amounts of organic sulfur. The removal of organic sulfur achieved a 37.8% reduction at the optimum operation ...
Demineralization and desulfurization of high-sulfur coal from Assam (Makum coalfield), India, was investigated using aqueous solutions of sodium hydroxide, potassium hydroxide, and their mixtures (1:1) alone as well as followed by mild hydrochloric acid treatment. Compared to the alkali and acid alone, successive treatments with the …
DOI: 10.1016/S0378-3820(01)00201-6 Corpus ID: 98347423; Organic sulfur and hap removal from coal using hydrothermal treatment @article{Timpe2001OrganicSA, title={Organic sulfur and hap removal from coal using hydrothermal treatment}, author={Ronald C. Timpe and Michael D. Mann and John H. Pavlish and Peter K. K. …
Coal beneficiation and organic sulfur removal. 1996, Fuel. Show abstract. Organic sulfur removal from coal with supercritical methanol as solvent, combining extraction and reaction, was studied. Experiments were carried out in a 300 ml batch reactor with Illinois coal at a coal/methanol weight ratio of 1:1, 400–450°C and various …
This work explores the use of carbon dioxide, water, and their mixtures as solvent for the precombustion beneficiation of raw coal without using any toxic mineral acids in the temperature range of ...
The acceptable process should not only remove inorganic sulfur but also remove organic sulfur. Otherwise, it is not commercially viable. In biodesulfurization, microorganisms attack especially pyritic sulfur although some microbes attack organic sulfur in coal matrix (Kilbane et al. 2002). Even if they affect both, the effect rates vary ...
Coalification refers to the series of processes involved during the transformation of this organic vegetation into coal. The first step in transforming vegetation into coal is the formation of peat upon decay and decomposition of the dead plants through biological processes. ... Coal beneficiation using spirals is an age-old technique and is ...
Coal beneficiation and organic sulfur removal (PDF) Coal beneficiation and organic sulfur removal | Olev Trass - Academia.edu Academia.edu no longer supports Internet Explorer.
In order to improve the total sulfur removal rate in coal combustion, an acidic ionic liquid (IL) 1-carboxymethyl-3-methylimidazolium hydrogen sulfate ([HOOCCH2mim][HSO4]) as the extractant combined with the oxidant 30% hydrogen peroxide (H2O2) was applied to reduce the total sulfur content, and its microscopic mechanism of desulfurization was …
The effects of molar ratio, temperature, and extraction time on the removal of organic sulfur in coal were investigated, and sonicating coal at 40 °C for 60 minutes with 1:16 K2CO3:EG was found ...
Coal beneficiation has centered on two areas – physical and chemical. Now, there is a third area – biological. Physical cleaning separates undesirable substances, such as dirt, rocks and inorganic, or "pyritic" sulfur (sulfur combined with iron), from the coal. Often this is done using water. ... Chemical cleaning is used to remove organic ...
Request PDF | Desulfurization of high sulfur fine coal using a novel combined beneficiation process | The throughput of high-ash and high-sulfur fine-grain coal (0–6 mm) increases year by year.
Introduction. In China, as the primary source of energy, coal will still play an important role in the next few decades [1], [2]. However, as one toxic element in coal, sulfur could be converted into SO x during coal combustion, inhibiting the use of coal. Because SO x emissions was one of the main culprits of haze [3], [4], [5]. In addition, …
Investigation on desulfurization of coal samples from Boragolai and Ledo collieries of Makum coal field, Assam, India using alkali treatment leads to over 70 % removal of inorganic sulfur, and ...