sulphur reduction of coal by flotation 2012


Performance Recognition for Sulphur Flotation Process ...

As an important indicator of flotation performance, froth texture is believed to be related to operational condition in sulphur flotation process. A novel fault detection method based on froth texture unit distribution (TUD) is proposed to recognize the fault condition of sulphur flotation in real time. The froth texture unit number is calculated based on texture spectrum, and the probability ...

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Beneficiation of a Low Rank Coal to Produce High Quality ...

Abstract. A process was developed for the beneficiation of a low-rank coal containing relatively high ash (25.97%) and sulphur (5.78%) content. The low-rank sub-bituminous coal of Makerwal Area, Surghar Range, Punjab Province, Pakistan was cleaned by froth flotation technology to get high quality clean coal for commercial applications.

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Research on Mechanism of Enhanced Desulfurizing Flotation ...

When a synthetic coal/pyrite mixture (10.1% sulfur) was subjected to microbial flotation, the level of sulfur rejection was stable during the entire period of operation (i.e., one hour).

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Enhanced desulfurizing flotation of coal using ...

For −0.18 mm coal sample, the sulfur reduction is considerably higher than other granulometry coal samples. The combination of high sulfur reduction, high clean coal yield as well as low ash reduction in −0.18 mm coal sample was obtained in the newly developed method of enhanced desulfurizing flotation by sonoelectrochemistry.

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Enhanced desulfurizing flotation of high sulfur coal by ...

This promotes electron transfer and increases the clean coal yield during the flotation process. For instance, Zhang et al. [69] investigated a study on desulphurization of high-sulphur coal using ...

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Pyrite Recovery Mechanisms in Coal Flotation

Pyrite Recovery Mechanisms in Coal Flotation. In many coal flotation operations, a significant amount of apparently liberated pyrite is seen to report to the froth, thus raising the sulfur content of the clean product and reducing its economic value. Prevention of this unwanted recovery of pyrite is therefore desirable.

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An Insight into Research and Investigations on Froth Flotation

For reduction of ash and sulfur laboratory-scale flotation cell. In their research, they content of coal, they observed that kerosene(as a investigated the effects of temperature and pH in the collector) and pine oil (as a frother) were best choices. recovery of oil from oil/sand slurries.

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WASHABILITY AND FROTH FLOTATION TESTS OF LAFIA-OBI …

80% will be obtained. Froth flotation at Ph7 of the coal gave an average ash content of the total float to be 6.64% with the higher ash content reporting in the first float being10.29%. The sulphur, moisture and volatile matter are same as in the raw coal. Froth flotation at Ph9 of …

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Effect of some operational parameters on desulphurization ...

Emission of sulphur dioxide from thermal power plants is a major environmental problem in the 21st century. Sulphur is present in coal mainly as pyritic, sulphate and organic forms. Pyritic sulphur is present in coal as part of mineral matter whereas the organic sulphur is present as organic compound which is an integral part of the coal matrix.

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Recent advances of sodium borohydride reduction in coal ...

Physical processes such as froth flotation and magnetic force separation can only remove a portion of pyritic sulfur but cannot reduce organic sulfur. 5–8 Besides, some physical processes are not cost effective methods. 9 Microbial desulfurization of coal is usually carried out with chemolithoautotrophic bacteria such as T. thiooxidans and T ...

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Application of Bacillus subtilis for reducing ash and ...

The results showed that using a flotation feed containing 3.3 % total sulfur and 6.65 % ash, a significant reduction of the impurities (i.e., sulfur and ash) as well as a coal concentrate with 0.9 % total sulfur and 1.95 % ash was obtained.

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Rapid total sulphur reduction in coal samples using ...

Currently in South Africa, online flue gas desulphurisation (FGD) is being utilized as one of the most effective methods for total sulphur reduction in coal samples during the combustion process. However, the main disadvantage associated with FGD is the formation of its by-products (FGD gypsum). The latter is mostly formed in low grade quality, thereby bringing secondary pollution problems and ...

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PDF Separation Of Pyrite From Coal By Froth Flotation ...

Attia, Y.A. and Elzeky, M.A. ( 1985 ), " Biosurface Modification in the Separation of Pyrite from Coal by Froth Flotation, " Coal Science and Technology Vol . 9 – Processing and Utilization of High - Sulfur Coals, pp . 673–682 .

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Enhanced desulfurizing flotation of coal using ...

Pyritic sulfur, organic sulfur, ash as well as moisture are partially removed. The combination of high sulfur reduction, high yield, as well as high ash reduction was obtained in the newly developed method of enhanced flotation by sonoelectrochemistry. Ultrasound irradiation promotes electron transfer efficiency and increases clean coal yield.

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Coal Beneficiation Process Diagram

Coarse Coal Flotation Circuit. ... The report states that a 1% reduction in ash content of coal means a reduction of 30 cents in cost of pig iron. One large plant reduces the ash from 7% to 3.5% by cleaning, thus cutting the cost of producing pig iron a dollar or more per ton. ... Ash and sulphur content is desired to be as low as, or lower ...

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What Is Coal Preparation? - Energy.gov

What Is Coal Preparation? • Coal preparation is the removal of undesirable material from the Run-of-Mine (ROM) coal by employing separation processes which are able to differentiate between the physical and surface properties of the coal and the impurities. Through coal …

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Effect of ultrasonic irradiation on particle size ...

Coal is an abundant energy source, that the population growth and technology development greatly increases its consumption. The increasing use of coal and the need to reduce environmental pollutions draws more attention to the coal processing technology (Laskowski 2001).. In the existing methods for mineral processing, flotation is considered as a physicochemical method …

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Enhanced Fine Coal Cleaning With a Novel Hydroacoustic ...

led to a slight reduction in the cut size for both fine and ultrafine coal streams. Spiral separation of deslimed -1.0 mm material led to higher clean coal yields at similar ash contents. Treatment of -0.15 mm material prior to flotation had only a minor effect on results.

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CHEMICAL BENEFICIATION OF LOW GRADE COAL - A REVIEW

66.9% of the pyritic sulfur from the coal sample. Column flotation has an advantage over conventional flotation as it can provide higher concentrate grade and recovery, lower maintenance costs, and improved process control [Groppo and Parekh, 1990]. Flotation variables are the pH of pulp, types and dosages of reagents, percentage of solid

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Flotation of a Low-Grade Zinc Oxide Ore After Surface ...

Flotation of the low-grade zinc oxide ore was achieved after surface modification by sulfidation and reduction at high temperature. A flotation concentrate containing 32.1% Zn and 8.0% Pb was obtained, and the Zn and Pb recoveries were 91.3% and 92.3%, respectively.

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(PDF) Flotation of coal and sulphur from South African ...

Flotation of coal and sulphur from a typical South African ultrafine colliery waste has been achieved in laboratory-scale batch flotation tests, using dodecane, kerosene, and oleic acid as coal ...

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PROPERTIES OF FATTY ACID/DODECYLAMINE MIXTURES AND …

Compared with flotation of coal slimes in coking coal preparation plants, a certain amount of ash reduction can be acceptable for coal slimes in steam coal preparation plant. Therefore, reverse flotation of steam coal slimes should be more suitable. Although coal reverse flotation displays these advantages, it is still not brought to

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Effects of organic sulfur on oxidation spontaneous ...

Results of sulfur analysis of the coal after flotation are shown in Table 1. This table shows that the total sulfur content in the coal after flotation was still high and formed mostly of organic sulfur, which is difficult to remove. Inorganic sulfur only forms about 10% of the total sulfur content, while organic sulfur accounts for the other 90%.

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Fine Coal Froth Flotation ebook PDF | Download and Read ...

Fine Coal Froth Flotation. Download and Read online Fine Coal Froth Flotation ebooks in PDF, epub, Tuebl Mobi, Kindle Book. Get Free Fine Coal Froth Flotation Textbook and unlimited access to our library by created an account. Fast Download speed and ads Free!

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An overview of reverse flotation process for coal ...

Flotation is one of the most effective technologies for the up-gradation of coal fines of particle size below 0.5 mm because of the inherent hydrophobic nature of coal.Contrary to this, reverse flotation of coal in which coal particles are depressed and gangue particles floated, was developed as an alternative process to minimise the sulphur content in the coal.

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1 Froth Flotation – Fundamental Principles

1 Froth Flotation – Fundamental Principles Froth flotation is a highly versatile method for physically separating particles based on differences in the ability of air bubbles to selectively adhere to specific mineral surfaces in a mineral/water slurry. The particles with attached air …

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Enhanced desulfurizing flotation of different size ...

Highlights Desulfurizing flotation of different size fractions of high sulfur coal by sonoelectrochemistry. The electrolyte was sodium chloride and the additive was anhydrous ethanol. Part of pyritic and organic sulfurs as well as ash are removed. The highest rate of sulfur reduction is 82.7% for 0.076–0.125 mm coal. The method is effective in calorific value increment and moisture reduction.

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Flotation of coal and sulphur from South African ultrafine ...

Coal flotation Effect of frother and collector dosage As reported previously (Kazadi Mbamba et al., 2012), the initial laboratory batch flotation tests were carried out using dodecane (which is used in the Australian Standard method for coal flotation) as collector. The dosage was varied from 0.70 to 3.72 kg/t, while the MIBC frother dosage was ...

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COAL FLOTATION - Mineral Processing & Metallurgy

Without this flotation step, the fine coal would upset the specific gravity range of the natural media and create a large circulating load of coal fines in the media. The media is a closely controlled fraction from the tailings produced by the main flotation section with respect to density and size ( — 60, + 250 mesh).

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Research on Mechanism of Enhanced Desulfurizing Flotation ...

(2003). Research on Mechanism of Enhanced Desulfurizing Flotation of High Sulfur Coal with Electrolytic Reduction. Coal Preparation: Vol. 23, No. 5-6, pp. 239-250.

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Desulfurization of coal by an electrochemical-reduction ...

The optimum conditions for sulfur removal from coal by electrochemical reduction flotation in an aqueous NaCl solution were determined from orthogonal experiments. The effect of electrolytic conditions on the desulfurization ratio was also studied. The electrochemical-reduction processed coal was examined by X-ray diffraction, Fourier transform infrared spectroscopy and wet chemical analysis.

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Organic Sulfur Reduction on Lignite Coal Using Multistage ...

This study focuses on the biodesulfurization of lignite specifically the reduction of organic sulfur, namely aliphatic mercaptans/thiols via bioprocess methods. The process was conducted by using multistage artificial biotreatment (A-Bmt) and Pseudoclavibacter sp. SKC/XLW-1 strains as biocatalysts. The aims are to improve the recovery of clean coal by reducing the organic sulfur both in ...

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Sieve Analysis and Determination of Grain Size ...

sulfur reduction after beneficiation of a ICO coal can range from 22 to 72%, an ICO coal also has been known to show a reduction in ash yield of 78% after beneficiation. (1) In industry, the separation of coal sizes and resulting homogeneity of size at each separation after beneficiation allows for the coal to

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Reduction of Sulfur and Ash from Tabas Coal by Froth Flotation

Reduction of ash and sulfur from Tabas coal, Iran by flotation was studied by Reza and Farahnaz [53]. Use of kerosene and methanol as collectors decreased the ash and sulfur content of the coal by ...

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(PDF) Desulfurization and demineralization of high sulfur ...

High sulfur low-grade lignite coal of Mianwali was carried out under flotation and leaching. process to improve its properties by lowering its sulfur and ash content. After performing the ...

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Geochemical characteristics of fluorine in coal within ...

The ash reduction rate in prepared samples is mostly over 40% and the ash reduction rate of coal in the Huaning coalfield reaches 74.29%. The sulphur reduction rate varies, but the volatilization of sulphur in coal is controlled to some extent by preparation, and the sulphur reduction rate in the Huaning minefield reaches 61.55%.

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