GB1114820A - Improvements in or relating to the upgrading and dewatering of coal - Google Patents

Improvements in or relating to the upgrading and dewatering of coal

Info

Publication number
GB1114820A
GB1114820A GB348867A GB348867A GB1114820A GB 1114820 A GB1114820 A GB 1114820A GB 348867 A GB348867 A GB 348867A GB 348867 A GB348867 A GB 348867A GB 1114820 A GB1114820 A GB 1114820A
Authority
GB
United Kingdom
Prior art keywords
coal
slurry
dewatered
flocs
floated
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB348867A
Inventor
Arun Kumar Chakravarti
Jagadish Chattopadhyay
Gour Gopal Sarkar
Adinath Lahiri
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Council of Scientific and Industrial Research CSIR
Original Assignee
Council of Scientific and Industrial Research CSIR
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Council of Scientific and Industrial Research CSIR filed Critical Council of Scientific and Industrial Research CSIR
Publication of GB1114820A publication Critical patent/GB1114820A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/02—Froth-flotation processes

Abstract

In a process for upgrading small coal, a thick slurry of the coal is prepared and is mixed with a mixture of paraffinic and tar oils to form an oily pulp which is aerated in a flotation cell so that the clean coal is floated up as oiled flocs, the latter being then removed from the cell and dewatered in a centrifuge. Crushed coal or natural small coal is wet screened at 1.0 or 0.5mm. The undersized slurry is thickened to 35 to 40% solid content in a rake thickener, settling cone or hydrocyclone. The thickened slurry is treated with 1-5% by weight of a mixture of diesel and tar oils. The clean coal-flocs formed are floated by aeration in a flotation cell. The flocs are then partially dewatered on a curved static wedge-wire screen and delivered to a pug mill or screw mixer for blending back with the oversized fraction originating from the wet screening step. With slurry containing undersize in the range of - 1mm. or coarser, the blending back step may be eliminated. The blended product or the partially dewatered slurry (-1mm.), as the case may be, is then finally dewatered in a continuously operated basket centrifuge.
GB348867A 1966-09-22 1967-01-24 Improvements in or relating to the upgrading and dewatering of coal Expired GB1114820A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEC0040170 1966-09-22

Publications (1)

Publication Number Publication Date
GB1114820A true GB1114820A (en) 1968-05-22

Family

ID=7024061

Family Applications (1)

Application Number Title Priority Date Filing Date
GB348867A Expired GB1114820A (en) 1966-09-22 1967-01-24 Improvements in or relating to the upgrading and dewatering of coal

Country Status (2)

Country Link
DE (1) DE1483726A1 (en)
GB (1) GB1114820A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2143155A (en) * 1983-06-27 1985-02-06 Conoco Inc A method of separating fine coal particles from refuse
US4857221A (en) * 1986-05-14 1989-08-15 Fospur Limited Recovering coal fines
US4859318A (en) * 1987-10-16 1989-08-22 Fospur Limited Recovering coal fines
US4998624A (en) * 1985-05-30 1991-03-12 Canadian Patents And Development Limited Method of separating carbonaceous components from particulate coal containing inorganic solids and apparatus therefor

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2143155A (en) * 1983-06-27 1985-02-06 Conoco Inc A method of separating fine coal particles from refuse
US4998624A (en) * 1985-05-30 1991-03-12 Canadian Patents And Development Limited Method of separating carbonaceous components from particulate coal containing inorganic solids and apparatus therefor
US4857221A (en) * 1986-05-14 1989-08-15 Fospur Limited Recovering coal fines
US4859318A (en) * 1987-10-16 1989-08-22 Fospur Limited Recovering coal fines

Also Published As

Publication number Publication date
DE1483726A1 (en) 1969-09-25

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