An investigation of a separation process involving liquid—water—coal systems

Keller, D. V.; Burry, William M.

doi:10.1016/0166-6622(87)80004-5

Cited by 21 publications

(5 citation statements)

References 6 publications

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“…Keller et a/. [14]. The relationship indicated that as the interfacial tension of the agglomerant/water interface increased the product coal ash content decreased.…”

Section: Agglomerationmentioning

confidence: 95%

“…This is important because coal surfaces are a mixturc of hydrophilic and hydrophobic sites. The former as cited by Keller [14,201 involve the surface areas of coal due to mineral matter, pore voids (filled with water) that intercept the surface and oxygen or other polar groups on the surface all of which would result independently in surface areas with a very low contact angle with water. The hydrophobic areas are accepted to be due to a mixture of paraffinic and aromatic compounds [27] depending on the rank of the coal [28].…”

Section: Demineralization Of Coal By the T-processmentioning

confidence: 98%

“…There is no intent to generalize these observations to include the results that might occur when other agglomerants are used as that subject was reported by Keller [14].…”

Section: Introductionmentioning

confidence: 94%

“…An analysis of over 500 samples of eastern and midwestern coals suggests that three variables are important in establishing the gas content; namely, small mean particle diameter, low porosity, and low oxygen content in the coal. Keller [14,201 after carefully examining the results and analyses of lsraelachvili [21], Tanford [22], and Salazar [23] concluded that the hydrophobicity of the coal surfaces was due to the same variables as well as the coal rank dependent variable mix of organic moieties, paraffinic and aromatic compounds. Pashley et al [24], Christenson, el al.…”

Section: Demineralization Of Coal By the T-processmentioning

confidence: 99%

“…Pentane (C,H,,) is immiscible in water and with proper dispersion in the water/coal/mineral matter mixture the pentane coats the coal particles providing liquid bridges [I-41 between the coal particles such that they bind together forming a mass which is readily separated from the mineral particles that remain dispersed in the water. The liquid/ liquid/solid separation process has a long history in its own right [3-71 and particularly 2 D. V. KELLER, Jr and W. M. BURRY so in reference to its application to the demineralization and recovery of fine coal [4,[8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

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The Demineralization of Coal Using Selective Agglomeration by the T-Process

Keller¹,

Burry²

1990

Coal Preparation

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The demineralization of coal by selective agglomeration using pentane as an agglomerant which has been called the "T-process" involves two steps: first, the raw coal is reduced to some particle size smaller than 0.5mm. And secondly, the fine coal is recovered from a dilute raw coal water slurry by the dispersion of pentane in the slurry. The pentane envelopes the coal particles which allows the formation of liquid bridges between the coal particles that results in a water immiscible mass of coal and pentane. The latter is separated from the dispersed mineral matter in the water phase by some simple mechanical procedure. The coal recovery from very fine raw coals is normally in excess of 95%. The penrane is recovered by evaporation/condensation for reuse in the process leaving the demineralized coal for utilization either as a slurry or as dry pellets. Pilot operations using this process have produced over 125 tons of pyrite-free product coal with an average ash content in the range of 0.8 wt %.A detailed discussion of the extent of mineral release during comminution is coupled with examples of deashing of raw coals into the range below 0.3 wt % ash and over 95% pyrite extraction from typical steam coals. The salient points of the relationship between particle size distribution and mineral release are established.The broad applicability of selective agglomeration with pentane to the mineral separation from over 100 different seams of coal is illustrated. The stable gas content in a milled slurry was related to the agglomeration timedata for thirty different seams ofcoal. The relationship from those data suggested that the degree of hydrophobicity ofthe coal surkce of the particles was the common Factor.The processing costs are estimated to be in the range of $0.60 per million BTU.

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“…Keller et a/. [14]. The relationship indicated that as the interfacial tension of the agglomerant/water interface increased the product coal ash content decreased.…”

Section: Agglomerationmentioning

confidence: 95%

Section: Demineralization Of Coal By the T-processmentioning

confidence: 98%

“…There is no intent to generalize these observations to include the results that might occur when other agglomerants are used as that subject was reported by Keller [14].…”

Section: Introductionmentioning

confidence: 94%

Section: Demineralization Of Coal By the T-processmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations