Feasibility of using ultrasound-assisted process for sulfur and ash

In a previous study, sulfur and ash removal from typical high-sulfur Northeast Indian coals [17,18] and Brazilian power coals by using low-power (20 kHz) and high-power (40 kHz) ultrasonic energy ...

Desulfurization of Coal

3. Coal Cleaning for Sulfur Removal The coal cleaning process has traditionally focused on reducing ash-reforming minerals and not necessarily aimed at removing sulfur in coal until recently. However, increasingly stringent regulations for SOx emissions during coal combustion have encouraged technical development of coal cleaning for sulfur ...

Biological removal of sulphur and ash from fine-grained …

The structural change of coal during the biodesulfurization showed that the pyrite was solubilized by Sulfobacillus to realize the removal of inorganic sulfur from coal, and L-cysteine addition inhibited the jarosite formation through improvement of pyrite bio-oxidation and corresponding pH decrease, which avoided the dissolved sulfur returning ...

Removal of sulfur at high temperatures using iron-based sorbents

The sulfur removal increases when the sulfidation temperature and CO/CO 2 ratio increase [1], [8]. In general, it is not favorable to use single metal oxides to prepare sorbents for hot coal gas desulfurization. ... Silica and alumina components which are inert to gaseous sulfur species in coal ash may provide better resistance to attrition and ...

Removal of sulfur at high temperatures using iron-based …

This paper deals with the simultaneous removal of H 2 S and COS in the temperature range of 400-650 °C at 1 bar by using iron-based sorbents. The iron-based sorbents were prepared using iron oxide and cerium oxide with coal fine ash as the support.

Investigation of removal of ash and sulfur from Kangal …

Experimental findings have shown that combination methods provide better results in ash and sulfur removal from lignite coal. Finally, a clean coal product with …

Method for sulfur removal from coal fly ash (Patent) | DOE …

@article{osti_1987210, title = {Method for sulfur removal from coal fly ash}, author = {Wang, Bu and Ragipani, Raghavendra}, abstractNote = {A method of reducing sulfur concentration in fly ash, flue gas desulfurization (FGD) ash, and mixtures thereof by contacting the fly ash, FGD ash, or mixtures thereof with an aqueous acidic solution, for …

Removal of sulfur dioxide using absorbent synthesized from coal fly ash …

Removal of SO 2 from flue gas by the absorbent synthesized from coal fly ash and calcium oxide was studied under different reaction conditions to elucidate the effect of the coexistence of NO and O 2 in the flue gas.The presence of O 2 and NO in the flue gas was found to be necessary to produce sulfate (SO 4 2-) salts instead of sulfite (SO 3 …

Method for sulfur removal from coal fly ash (Patent)

A method of reducing sulfur concentration in fly ash, flue gas desulfurization (FGD) ash, and mixtures thereof by contacting the fly ash, FGD ash, or mixtures thereof with an aqueous acidic solution, for a time, at a temperature, and at a liquid-to-solid ratio wherein the sulfur concentration within the fly ash, FGD ash, or mixture thereof is …

Effects of minerals and Fe3+ on sulfur removal and its …

Yunnan anthracite coal (YN) with high FeS2, Pingshuo coal (PS) with high organic sulfur and Duerping coal (DEP) with 33.52% organic and 64.20% inorganic sulfur were selected to investigate the effects of minerals and Fe3+ on sulfur release behavior during coal pyrolysis under Ar and 3% O2–Ar atmospheres by pyrolysis connected with …

CHAPTER 3 Coal Preparation and Cleaning

extensive size reduction and cleaning to remove sulfur and ash-forming mineral matter. At present, coal cleaning is accomplished through physical separation of particles low in mineral content from particles high in mineral content. In the future it may include chemical and biological treatment for removal of certain impurities from coal.

Mechanism for Removal of Organic Sulfur from Guiding Subbituminous Coal

Ash in Guiding subbituminous coal (GSBC) was removed by treatment with dilute acids. The treated GSBC (TGSBC) was extracted with isopropanol (IP) to afford IP-extractable fraction (IPEF). TGSBC was sequentially extracted with petroleum ether, carbon disulfide, acetone, and methanol. Octane-1-thiol and thiophene were selected as model …

Review of arsenic behavior during coal combustion: …

Fig. 20 shows the transformation of arsenic compounds with sulfur in coal. Sulfur was thought to compete with these surface reactions of minerals and arsenic, which decreased arsenic partitioning onto fly ash surfaces. Download: Download high-res image (167KB) Download: Download full-size image; Fig. 20.

Removal of Sulfur and Ash from Coal Using Molten Caustic Leaching, a

The percentage of demineralization and desulfurization increased with the increase in alkali/coal ratio. The removal of total sulfur and ash increases with increasing leaching temperature and time. As a result of MCL, ash content of Hazro coal was reduced from 18.31 to 6.77 %, and 70% of combustible was recovered.

Removal of Organic Sulfur from Coal by Wheat Straw …

The effect of temperature on organic sulfur removal of coal was investigated. Relations between temperature and organic sulfur removal from coal samples by potassium ferric hexacyanoferrate (II) method are shown in Figure 1. Removal of organic sulfur content increased continuously with increasing temperature from 298 to 368 K.

Machine learning prediction of pyrolytic sulfur migration based on coal

During coal pyrolysis, some C-S bonds are broken and thus sulfur-containing gases are released [2], which is the main way of sulfur removal from char. Timely release of sulfur-containing gases caused by sulfur decomposition is the key to sulfur removal from high-sulfur coals during coking.

Desulfurization and removal ash of high sulfur coal by …

A high sulfur coal was desulfurized and removed ash by microwaved oxidation process. Microwave oxidation experiments were designed with Box Behnken design (BBD) and the main process variables and their interactions in microwave oxidation treatment depicted with the mathematical model.

A model for alkaline removal of sulfur from a low-rank coal

1.. IntroductionThe pretreatment processes applied to low-rank coals with high percentage of sulfur and ash might be an affordable approach in developing countries to remove the sulfur [1].Many of the processes developed to date utilize strong alkaline solutions at high temperatures or molten caustic, sometimes with an oxidizing agent …

Machine learning prediction of pyrolytic sulfur migration based on coal

Understanding the sulfur migration during pyrolysis of coals especially high-sulfur coals is important. However, structural complexity and diversity of coals make it face huge challenge. In this study, a predictive model for morphological sulfur migration was developed using machine learning based on proximate analysis, ultimate analysis, …

Coal Preparation and Cleaning

Abstract. Most coal requires some preparation before use. Preparation may range from simply crushing to provide a size consist suitable for certain types of boilers to extensive …

Sono-Processing of Coal for Removal of Ash and Other …

of the coal itself. Organic-sulfur is chemically bonded and very difficult to remove by physical cleaning methods. Methods to control SO 2 emissions may be classified as: 1. …

Removal of Sulfur and Ash from Coal Using Molten Caustic …

The removal of total sulfur and ash increases with increasing leaching temperature and time. As a result of MCL, ash content of Hazro coal was reduced from …

11.10 Coal Cleaning

Coal cleaning is a process by which impurities such as sulfur, ash, and rock are removed from coal to upgrade its value. Coal cleaning processes are categorized as either physical cleaning or ... scrubber water increases the SO2 removal efficiency of the scrubber. A number of inorganic hazardous air pollutants are found in trace quantities in ...

Feasibility of using ultrasound-assisted process for sulfur and ash

Author Reagent Time Sulfur and or ash removal; Mukherjee et al. [2] H 2 O 2 and H 2 SO 4: 4: h: Using 15% (vol.) H 2 O 2 and 0.1 N H 2 SO 4: : 45% of total sulfur removed (complete removal of inorganic sulfur and 31% removal of organic sulfur) : 45% ash removed Ozdemmir et al. [15] Chlorine in CCl 4 + H 2 O: 6: h: Using 0.033 l/min …

CHAPTER 3 Coal Preparation and Cleaning

Removal of Sulfur and Ash from Coal Using Molten Caustic …

The percentage of demineralization and desulfurization increased with the increase in alkali/coal ratio. The removal of total sulfur and ash increases with increasing leaching temperature and time. As a result of MCL, ash content of Hazro coal was reduced from 18.31 to 6.77 %, and 70% of combustible was recovered.

Coal explained Mining and transportation of coal

Mining coal. Coal miners use large machines to remove coal from the earth. Many U.S. coal deposits, called coal beds or seams, are near the earth's surface, but others are deep underground.Modern mining methods allow U.S. coal miners to easily reach most of the nation's coal reserves and to produce about three times more coal in one hour than in …

Study on denitration and sulfur removal performance of …

Nitrogen oxides (NOx) are the main pollutants of air, which mainly come from the combustion of coal and fossil fuels. In this paper, with fly ash used as the catalyst carrier, the effects on the denitration and sulfur resistance of Mn-Ce loading sequence and molar ratio were studied. The catalyst wa …