Surface Engineering of Low Rank Indian Coals by Starch-Based Additives for the Formulation of Concentrated Coal−Water Slurry

Das, Dillip Kumar; Das, B.; Nayak, A. Chetan; Misra, Pratibha

doi:10.1021/ef900921c

Cited by 56 publications

(27 citation statements)

References 38 publications

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“…When the carbonaceous contents contain more oxygenic functional groups, less oil attaches to the surface of the carbonaceous content. In other words, the hydrophilic functional groups prevent hydrophobic oils from adhering to the surface of the carbonaceous contents [13]. Figure 4 shows that the agglomerates of Chongqing ash-free coal had many oils attached compared with any other coal samples.…”

Section: Inhibition Of Oil Attachment By Oxygen Contentsmentioning

confidence: 99%

Oil aggregated behavior for coal recovery and combustion characteristics of their aggregates from different grade coals

Wang¹,

Niida²,

Liu³

et al. 2014

Int. J. SDP

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Section: Inhibition Of Oil Attachment By Oxygen Contentsmentioning

confidence: 99%

Oil aggregated behavior for coal recovery and combustion characteristics of their aggregates from different grade coals

Wang¹,

Niida²,

Liu³

et al. 2014

Int. J. SDP

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“…The computational results of oil adhesion which is the amount of oil comprised in the agglomeration show that Chongqing ash free coal 93.1% > Furong ash free coal 75.6 % > Adaro ash free coal 69.8 %. The more carbonaceous content has oxygenic function groups, the less the oil attaches on the carbonaceous surface, which in other words means the hydrophilic function groups prevent the hydrophobic oil from adhering on the carbonaceous content [11]. In figure 4, the agglomeration of Chongqing ash free coal which many oils attach grows than any other coal samples, and the particle size ratio of > 500 μm agglomeration occupied most of them.…”

Section: Inhibition Of Oil Attachment On Oxygenic Contentmentioning

confidence: 99%

Influential factors on the oil agglomeration process for coal recovery from different grade coals

Wang

Niida

Apar

et al. 2012

WIT Transactions on Ecology and the Environment

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Large amounts of waste fine coals are produced, which are difficult to be treated because of high ash content and inorganic sulfuric compounds. In order to make efficient use of waste fine coal, a retrieval technique is necessary for the recovery of coal combustible content from fine waste coals. Nowadays, the floatation process can be used, but it is impractical for developing countries due to high costs, then the oil agglomeration process can deal with these problems. In this study, we investigated the affecting factors of coal cleaning efficiency of oil agglomeration on the element content and chemical structure of three different grade coals because there are many grades of coals around the world. For determination of chemical content in three different grade coals, the help of proximate and ultimate analysis was used, and then for investigation of their chemical structure differences of carbonaceous content, a Fourier transforminfrared spectrometry (FT-IR) was applied. Furthermore, for the oil agglomeration experiments, kerosene and vegetable oil which differ in structure were used as aggregating agents. We used ash free coals or their mixed samples which were conditioned to the ratios of carbonaceous and ash content in order to make it the same contained amounts. From the results of the oil agglomeration experiments, it was concluded that the characteristics of agglomerate and the coal cleaning efficiency of oil agglomeration are not only influenced by the oil types, but also affected by the oxygenic content, aromatic and aliphatic chemical structures in different grade coals. Oxygenic function groups of carbonaceous content in coal samples ,

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“…Researches have shown that coal rank is one of the most important factors influencing the slurry performance of CWS. [10][11][12][13][14][15] Normally, coal can be divided into three categories: high-, medium-, and low-rank, each with different physical and chemical properties. Therefore, the slurry performance of CWS can vary widely by rank of coal.…”

Section: Introductionmentioning

confidence: 99%

“…It was found that CWS prepared from low-rank coals had excellent combustion characteristics in a gas turbine. [16] Das et al [13] modulated three varieties of noncoking coal (low-rank Indian coal) using three starch-based additives, and obtained a highly concentrated coal-water slurry with low viscosity. Tiwari et al [17] obtained a high concentration CWS, which was up to 69% of coal loading, from Indian coals using the newly developed naphthalenetoluene-based additive.…”

Section: Introductionmentioning

confidence: 99%

Study on Enhancing the Slurry Performance of Coal–Water Slurry Prepared with Low-Rank Coal

Yang

Qiu

et al. 2014

Journal of Dispersion Science and Technology

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Although coal-water slurry (CWS) with low-rank Shenhua coal has poor slurry performance, it is a good power coal with many advantages including low ash content and ease of incineration. This article establishes differences between the slurry performance of CWS prepared with low-rank Shenhua coal and medium-rank Shandong coal. Moreover, we examined the effects of coal powder gradation, water pre-adsorption, formulation of modified sodium lignosulfonate (SL-M) with other dispersants and stabilizer, and a combined preparation of coal samples on the apparent viscosity of CWS. Results showed that the existence of weak acid groups, strong water adsorption ability, and high-density mineral substances were the major factors that affected the slurry performance of low-rank Shenhua coal. Furthermore, when the average coal particle size was 26.19 lm, the apparent viscosity of CWS was lowest according to bimodal distribution. When low-rank coal was treated first with water pre-adsorption, the slurry performance of CWS was greatly improved and the apparent viscosity was only 1200 mPa Á s when the solid concentration was 63%, showing an increase of 3%. Finally, when low-rank Shenhua coal was combined with medium-rank Shandong coal, apparent viscosity was enhanced.

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Surface Engineering of Low Rank Indian Coals by Starch-Based Additives for the Formulation of Concentrated Coal−Water Slurry

Cited by 56 publications

References 38 publications

Oil aggregated behavior for coal recovery and combustion characteristics of their aggregates from different grade coals

Oil aggregated behavior for coal recovery and combustion characteristics of their aggregates from different grade coals

Influential factors on the oil agglomeration process for coal recovery from different grade coals

Study on Enhancing the Slurry Performance of Coal–Water Slurry Prepared with Low-Rank Coal

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