Recovery of waste fine coal by oil agglomeration

Shrauti, Suresh M.; Arnold, David W.

doi:10.1016/0016-2361(95)93483-t

Cited by 34 publications

(14 citation statements)

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“…This result is consistent with the findings of previous studies (Shrauti and Arnold, 1995;Alonso et al, 1999), which indicated that ash removal decreased under conditions of greater oil addition because of agglomerating less hydrophobic particles. Figure 4 illustrates a higher quality of char led to a lower rate of combustible recovery.…”

Section: Analysessupporting

confidence: 83%

“…Shrauti and Arnold (1995) noted that high ash content led to low agglomerate recovery by allowing water to penetrate into agglomerates easily, consequently weakening particle bonds. Figure 4b presented that the weight of ash in ASR char decreased from 68.7% to 55%, but the rate of combustible recovery was no more than 15% and heating values were still much less than 20000 kJ/kg.…”

Section: Asr Charmentioning

confidence: 99%

“…Oil agglomeration is accomplished by intensively mixing an oil and coal slurry to form aggregates. Differing surface hydrophobicity makes oil adhere to hydrophobic organic constituents, separating them from hydrophilic inorganic compounds (Shrauti and Arnold, 1995).…”

Section: Introductionmentioning

confidence: 99%

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Improving the quality of waste-derived char by removing ash

et al. 2008

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This study characterized and removed ash from waste-derived char to improve the quality of char as fuel. Municipal solid waste (MSW) and automobile shredder residue (ASR) were carbonized at 450 o C and at 500 o C respectively in a rotary kiln with a nitrogen atmosphere for 1 h. MSW and ASR char were subjected to sieving and pulverization-sieving to screen incombustibles and the ash-rich fraction, after which float-sink separation, froth floatation, and oil agglomeration were applied to remove ash from the char. The established target quality was less than 30% ash content and more than 20000 kJ/kg heating value. However, the rate of combustibles recovery had to be lowered to produce a good quality of char along with a high heating value. MSW char attained the targeted quality level using froth floatation or oil agglomeration whereas neither separation method was able to make ASR-derived char satisfy the target.Based on the assumption that particle properties of char are determined by the weight ratio of combustibles and ash, the densities of combustibles and ash in char were estimated using the results of float-sink separation, X-ray diffraction (XRD) analysis, and elemental content. To verify the above assumption, an energy dispersive X-ray/scanning electron microscope (EDX/SEM) analyzer was used to observe char particles.

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Section: Analysessupporting

confidence: 83%

Section: Asr Charmentioning

confidence: 99%

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Improving the quality of waste-derived char by removing ash

et al. 2008

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“…However, effective as they were, none of the above technologies were successful in maintaining a long-term and viable application. As identified by various authors, all of these processes, along with all of the other attempts to implement a fine coal agglomeration process, were not successful as they suffered from poor economics which could not be reconciled [5,12,13]. More often than not, the cost of the oil was the prohibitive aspect of the process; however in some cases the capital costs were also too high.…”

Section: Introductionmentioning

confidence: 97%

A Kinetic Study of a Modified Fine Coal Agglomeration Process

Netten

Moreno-Atanasio

Galvin

2015

Procedia Engineering

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The process of fine coal agglomeration is a beneficiation technique that uses an organic liquid, such as, diesel, to agglomerate fine coal from an aqueous suspension of coal and mineral particles. The organic binding liquid is dispersed in the aqueous suspension through the application of agitation and selectively wets and agglomerates the hydrophobic coal particles. The hydrophilic mineral particles remain finely dispersed and, thus, the product coal agglomerates can be easily retrieved by passing the suspension over a screen. Fine coal agglomeration can achieve high quality beneficiation and allows for more effective dewatering of a fine coal feed. Regardless of these excellent capabilities, however, there are no industrial applications of this process. This is because the high cost of the oil makes the process economically unfeasible. Therefore, in this study a modified fine coal agglomeration process has been investigated in which the aim is to reduce the amount of organic liquid required in the process. The modification involves the use of a water-in-oil (W/O) emulsion as the immiscible binding liquid, replacing the conventional pure oil approach. A high internal phase (HIP) emulsion is used as it provides the interfacial functionality of the oil, while the space filling functionality is provided by the stabilised internal water droplets. In this study, an investigation into the kinetics of agglomeration of the modified process was undertaken. It was found that complete agglomeration of the carbonaceous material in the feed could be achieved by the emulsion binder in one third of the time required for a pure diesel binder. In addition, the improved kinetics were achieved by the emulsion binder at an organic liquid dosage of five-times less than required by a pure diesel binder.

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“…Yağ aglomerasyon yöntemi ise 1920'li yıllarda geliştirilmesine rağmen (Mehrotra ve ark. 1983), teknik başarısını ticari anlamda gösterememiş ve uygulanamamıştır (Shrauti ve Arnold 1995). Birkaç tesis kurulmuşsa da uzun ömürlü olmamıştır (Kawatra ve Eisele 2001).…”

Section: Introductionunclassified

Cleaning of Ultra–fine Coal by Physicochemical Methods

Şahinoğlu¹

2018

AKU-J. Sci. Eng.

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Kömür madenciliğinde mekanize kazı yöntemlerinin uygulanmasıyla birlikte oluşan çok ince boyutlu kömür miktarında artış gözlenmiştir. Bu kömürlerin temizlenmesinde teknik zorluklarla karşılaşılmaktadır. Bu nedenle, çok ince boyutlu kömürlerin temizlenmesi amacıyla teknik açıdan uygun yöntem(ler)in belirlenmesi önem arz etmektedir. Bu çalışmada, yüksek kül (%35,65) ve kükürt (%7,91) içerikli çok ince boyutlu (d80= 43,47 µm) Müzret kömürünün flotasyon, yağ aglomerasyonu ve agloflotasyon yöntemleri ile temizlenebilirliği araştırılmıştır. En yüksek yanabilir verime (%93,45) sahip konsantre agloflotasyon yöntemi ile elde edilmiştir. En fazla verim indeksi değerine %41,68 flotasyon ile ulaşılmıştır. Yağ aglomerasyonu deneylerinde %10 atık yağ miktarında elde edilen en yüksek yanabilir verim %87,15 iken, agloflotasyonda %1 atık yağ miktarında %92,18 yanabilir verim elde edilmiştir.

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Recovery of waste fine coal by oil agglomeration

Cited by 34 publications

References 1 publication

Improving the quality of waste-derived char by removing ash

Improving the quality of waste-derived char by removing ash

A Kinetic Study of a Modified Fine Coal Agglomeration Process

Cleaning of Ultra–fine Coal by Physicochemical Methods

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