Crushing & Grinding Machines

Research on Mechanism of Enhanced Desulfurizing Flotation

This improves the selectivity of the subsequent flotation process The results indicate that the electrolytic reduction can significantly decrease the content of pyrite sulphur in the floatation concentrate Using this method 89 of pyrite in the Beisu coal could be rejected while only 545 of pyrite sulfur was rejected without the treatment...

Rapid total sulphur reduction in coal samples using

The proposed total sulphur reduction method is advantageous as compared to some of the literature reported coal desulphurisation methods as it requires a short period 5 min of time to reach its completion Additionally the proposed method shows excellent reproducibility RSD from 05 to 1 therefore it can be utilized for routine analysis...

PDF Effect of ultrasonic irradiation on particle size

As flotation is one of the methods associated with surface properties this paper investigates the effect of these waves on performance particle size reagents and feed ash content in coal...

EFFECT OF KEY VARIABLES ON COAL CLEANING BY FROTH

coal during its formation period while the second one gets associated during the mining activities storage and transportation after the coal is formed Hence Coal Cleaning as the name suggests is the method implemented for the removal/reduction of mineral impurities from the coal...

Algal Lipids as Biocollector for Recovery of Coal from

A two-stage desulphurisation flotation process has been developed to valorise ultrafine coal wastes 8 10 The first stage of the flotation process the focus of this paper recovers clean coal from the waste while the second stage recovers pyrite into the small volume concentrate fraction which results in a high volume low-sulphur tailings that has reduced or no risk of acid generation...

CHEMICAL BENEFICIATION OF LOW GRADE COAL

669 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...

Power plant emissions of sulfur dioxide and nitrogen

Emissionsof sulfur dioxide SO 2 and nitrogen oxides NO x from the electric power sector in 2012 declined to their lowest level since the passage of the Clean Air Act Amendments of 1990The decline in emissions is due primarily to an increasing number of coal-fired units retrofitted with flue-gas desulfurization FGD or scrubbers to coal plants switching to lower sulfur coal and to...

Reduction of sulfur and ash from Tabas coal by froth flotation

Reduction of sulfur and ash from Tabas coal by froth flotation Article PDF Available in IRANIAN JOURNAL OF CHEMISTRY CHEMICAL ENGINEERING-INTERNATIONAL ENGLISH EDITION 26 2 35-40 April...

WASHABILITY AND FROTH FLOTATION TESTS OF LAFIA

80 will be obtained Froth flotation at Ph7 of the coal gave an average ash content of the total float to be 664 with the higher ash content reporting in the first float being1029 The sulphur moisture and volatile matter are same as in the raw coal Froth flotation at Ph9 of the coal...

US3807557A

Pyrite is removed from coal by means of a two-stage froth flotation process In the first stage coarse pyrite is removed as underflow in a conventional froth flotation operation In the second stage the froth product from the first stage is subjected to froth flotation using a coal flotation depressant and a pyrite flotation collector thereby removing a substantial proportion of fine pyrite...

Ultrasound

The flotation speed test results show that the sulfur and ash content of the cleaned coal after ultrasonic pretreatment are reduced by 3384 and 3209 respectively and the cleaned coal yield in the first two minutes is increased by about 10 on average...

Froth flotation

Froth flotation is a process for selectively separating hydrophobic materials from hydrophilicThis is used in mineral processing paper recycling and waste-water treatment industri Historically this was first used in the mining industry where it was one of the great enabling technologies of the 20th century...

Further Investigations on Simultaneous Ultrasonic Coal

This study investigates the flotation performance of a representative hard coal slime sample d80 particle size of minus 02 mm obtained from the Prosper-Haniel coal preparation plant located in Bottrop Germany Flotation was carried out with a newly designed flotation cell refurbished from an old ultrasonic cleaning bath 25 L volume equipped with a single frequency 35 kHz and two...

Enhanced desulfurizing flotation of high sulfur coal by

In this research reducing the ash content of mezino coal by 83 inorganic sulfur by 72 and its total sulfur content by 63 using flotation in alkaline pH and in the presence of copper ion was...

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...

DEASHING AND DESULPHURIZATION OF FINE OXIDIZED

Kroll-Rabotin et al 2012 2013 2014 The fine coal with high sulfur content can be efficiently cleaned in the enhanced centrifugal field The desulphurization efficiency can achieved over 71 and even up to 87 Tao et al 2006 Ibrahim et al 2014 Enhanced gravity separators make it possible for the efficient separation of fine coal...

US4830740A

The separation of coal from pyrite is enhanced by the use of an effective amount of a polymeric acid or salt thereof as a pyrite depressant in conventional flotation process The polymeric acid may be a carboxylic or sulfonic ac An example of a salt of a polymeric acid...

Coal Preparation Vol 20 No 3

Sulphur Reduction Studies in UK Coals F RUBIERA S IVATT N J MILES Study on Size and Density Distribution in Fine Coal Flotation Cheng et al Volume 33 2013 - Issue 3 Published online 20 Apr 2013 Views 974 2012 - Issue 1 Published online 5 Dec 2011 Crossref citations 21 View more...

Recovery of Lime Sulfur and Iron from Gypsum and Pyrite

Currently gypsum and pyrite two major wastes generated by the coal combustion industry have to be land-filled The feasibility of a new approach of recovery of lime iron and sulfur products from these wastes is discussed in the present work By thermal decomposition of pyrite 42 of the sulfur is recovered and pyrrhotite is produced A thermodynamic analysis shows that the recovery of...

Coal Desulfurization with Sodium Hypochlorite Energy Fuels

The desulfurization method for Illinois No 6 coal was capable of reducing significant amounts of organic sulfur The removal of organic sulfur achieved a 378 reduction at the optimum operation of leaching at 04 M hypochlorite and room temperature followed by hydrolysis at 03 M NaOH and 90 176 C...

Reagent collector for flotation of coal

Flotation of coal sludge is carried out in the mode described in example 1 at a flow rate of reagent 3 00 kg of the composition of the reagent Rel cycloalkylcarbonyl 3 8 naphthalenes 35 8 benzothiophene 3 8 polyaromatics cyclic sulfides sulfur in a saturated cycle 34 3 phenanthrenes 14 8 triaromatic condensed sulfur compounds 7 8...

Suppression of pyritic sulphur during flotation tests

The sulphur content of a synthetic coal/pyrite mixture was reduced from 109 to 21 by flotation after bacterial preconditioning It is postulated that pyrite removal in coals which are cleaned by froth flotation could be significantly reduced using a bacterial preconditioning stage with a...

Enhanced desulfurizing flotation of high sulfur coal by

Jan 01 2012 0183 32 Highlights Desulfurizing flotation of high sulfur coal by sonoelectrochemistry The electrolyte was calcium hydroxide and the additlve was anhydrous ethanol The rate of sulfur reduction reaches 754 Pyritic sulfur organic sulfur and ash are partially removed The combination of high sulfur reduction high yield and low sulfur content...

Demineralization and Desulfurization of High

Mar 19 2003 0183 32 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 alkali and acid resulted in significant removal of...

International Journal of Coal Preparation and Utilization

Coal samples from concentrate of Shahroud coal preparation plant with an ash content of 138 and a total sulfur content of 189 without pretreatment and also with pretreatment by microwave irradiation ultrasonic waves and microwave followed by ultrasonic microwave- ultrasonic was leached with HF and then HNO 3 to produce ultraclean coal UCC in a batch reactor...

Effect of ultrasonic irradiation on particle size

Mar 21 2020 0183 32 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...

US3926575A

Finely divided coal or coal derivatives containing pyrite are reacted with sulfurous acid the oxidizing agent if desired HCl may also be used to improve the reaction efficiency to remove pyritic sulfur from coal as shown by the following equations Primary Oxidation - reduction 4 FeS2 pyrite 3SO2 12 HCl ->4 FeCl3 11S 6 H2O Secondary Oxidation - reduction 4 FeCl3 FeS2...

Determination of forms of sulfur in coal Evaluation of

article osti_7225659 title = Determination of forms of sulfur in coal Evaluation of ASTM Standard Methods D-2492 and D-3177 author = Shimp N F and Kuhn J K and Helfinstine R J abstractNote = Widespread interest in reducing the sulfur content of coal has increased the need for chemical determinations of the forms of sulfur sulfate pyritic and organic...

Desulfurization and Deashing of Hazro Coal via a Flotation

Mar 10 2005 0183 32 A concentrate containing 112 pyritic sulfur and 1302 ash with a pyritic sulfur reduction of 6686 was obtained from a feed that contained 495 pyritic sulfur and 2477 ash The flotation method removed most of the sulfate sulfur gt 90 and 6686 of the pyritic sulfur from the coal...

Modes of occurrence and removal of toxic elements from

With an increased number of cleaning stages the content of toxic elements in the stepped release flotation products decreased indicating that multistage cleaning helped to remove these elements fro...