Selective spherical agglomeration of coal

Slaghuis, J.H.; Ferreira, L.C.

doi:10.1016/0016-2361(87)90191-8

Cited by 23 publications

(5 citation statements)

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“…The gasification zone is followed by the combustion zone where the combustion of the char is effected in the presence of oxygen. The ash zone is the last zone where the ash is cooled down by the excess steam and oxygen that is fed in at the bottom of the gasifier …”

Section: Introductionmentioning

confidence: 99%

Sulfur Behavior in the Sasol−Lurgi Fixed-Bed Dry-Bottom Gasification Process

et al. 2008

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This article reports on the findings of a study regarding the sulfur behavior across a Sasol-Lurgi gasifier. This was undertaken to understand the behavior of the various sulfur-bearing components in the coal, as they are exposed to the conditions in the gasifier. In this study, conventional characterization techniques were employed to monitor the behavior of sulfur-bearing mineral matter across the gasifier. It was observed from the study that the sulfur-bearing mineral (pyrite) in the coal structure undergoes various changes with pyrite being transformed to pyrrhotite and then to various oxides of iron with the subsequent loss of sulfur to form H 2 S. A low proportion of the sulfur species including the organically associated sulfur was encapsulated by a melt that was formed by the interaction between kaolinite and fluxing minerals (pyrite, calcite, and dolomite/ ankerite) present in the coal at elevated temperatures and pressure, thereby ending up in the ash. The remaining small proportions of sulfur-bearing mineral matter including pyrite and organically bound sulfur in the unburned carbon in the carbonaceous shales also report to the ash.

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Section: Introductionmentioning

confidence: 99%

Sulfur Behavior in the Sasol−Lurgi Fixed-Bed Dry-Bottom Gasification Process

et al. 2008

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“…Es konnte gezeigt werden, dass die Reinheit der entstehenden Graphitagglomerate 99,2 % betrug. Weitere Autoren nutzten diese Erkenntnisse unter anderem zur Kohleaufbereitung 3–7.…”

Section: Introductionunclassified

“…Es konnte gezeigt werden, dass die Reinheit der entstehenden Graphitagglomerate 99,2 % betrug. Weitere Autoren nutzten diese Erkenntnisse unter anderem zur Kohleaufbereitung [3][4][5][6][7]. Ein wichtiger Aspekt, um den Trennerfolg der mehrdimensionalen selektiven Umbenetzungsagglomeration charakterisieren zu ko ¨nnen, ist die Bestimmung der Reinheit der entstehenden Agglomerate.…”

Section: Introductionunclassified

Mehrdimensionale selektive Umbenetzungsagglomeration – Bestimmung der Reinheit von Graphitagglomeraten

Schreier

Bröckel

2023

Chemie Ingenieur Technik

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Die Umbenetzungsagglomeration bietet die Möglichkeit einer Trennung nach zwei Partikeleigenschaften. Hierbei wird nach den Benetzungseigenschaften des Feststoffs in Bezug zur Suspensions‐ und Bindeflüssigkeit getrennt und nach der Größe. Ziel dieser Arbeit ist, die Reinheit der entstehenden Graphitagglomerate in einer Mischung mit Quarzsand gravimetrisch zu bestimmen und diese mit den Benetzungseigenschaften zu korrelieren. Die Güte dieser Ergebnisse wird mit einer Mikroröntgentomographie (µ‐CT) untersucht. Es konnte gezeigt werden, dass sich Quarzsand mit Paraffinöl nicht benetzen lässt und somit Reinheiten von 99,5 % bis 99,9 % erreicht werden, was das Ergebnis der µ‐CT bestätigt. Einen Einfluss der Partikelgröße des Quarzsandes konnte im untersuchten Bereich nicht bestätigt werden.

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“…Oil is relatively inexpensive, and the process could be easily integrated into existing flotation circuits. Although oil agglomeration has been extensively studied for coal cleaning [23,24], there is still one serious issue with this technique when applied to porphyry copper ores: the amount of oil required remains huge (up to 5-10% of total weight of coal for agglomeration-screening technique or around 0.1-1.0% for agglomeration-flotation technique) [25]. To address this problem, agglomeration-flotation using emulsified oil instead of simply adding oil during the agglomeration step has been proposed [26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Agglomeration–Flotation of Finely Ground Chalcopyrite Using Emulsified Oil Stabilized by Emulsifiers: Implications for Porphyry Copper Ore Flotation

Hornn

Ito

Shimada

et al. 2020

Metals

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Flotation is the conventional method for processing porphyry copper deposits, one of the most economically important sources of copper (Cu) worldwide. The rapidly decreasing grade of this type of Cu ore in recent years, however, presents serious problems with fine particle recovery using conventional flotation circuits. This low recovery could be attributed to the low collision efficiency of fine particles and air bubbles during flotation. To improve collision efficiency and flotation recovery, agglomeration of finely ground chalcopyrite (CuFeS2) (D50 = 3.5 μm) using emulsified oil stabilized by emulsifiers was elucidated in this study. Specifically, the effects of various types of anionic (sodium dodecyl sulfate (SDS), potassium amyl xanthate (KAX)), cationic (dodecyl amine acetate (DAA)), and non-ionic (polysorbate 20 (Tween 20)) emulsifiers on emulsified oil stability and agglomeration–flotation efficiency were investigated. When emulsifiers were added, the average size of agglomerates increased, resulting in higher Cu recovery during flotation. This dramatic improvement in flotation efficiency could be attributed to the smaller oil droplet size in emulsified oil and their higher stability in the presence of emulsifiers. The utilization of emulsifiers during agglomeration–flotation not only lowered the required agitation strength for agglomeration but also shortened the agglomeration time, both of which made the process easier to incorporate in existing flotation circuits.

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Selective spherical agglomeration of coal

Cited by 23 publications

References 1 publication

Sulfur Behavior in the Sasol−Lurgi Fixed-Bed Dry-Bottom Gasification Process

Sulfur Behavior in the Sasol−Lurgi Fixed-Bed Dry-Bottom Gasification Process

Mehrdimensionale selektive Umbenetzungsagglomeration – Bestimmung der Reinheit von Graphitagglomeraten

Agglomeration–Flotation of Finely Ground Chalcopyrite Using Emulsified Oil Stabilized by Emulsifiers: Implications for Porphyry Copper Ore Flotation

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