EP0377995A2 - Briquetting process - Google Patents
Briquetting process Download PDFInfo
- Publication number
- EP0377995A2 EP0377995A2 EP89313406A EP89313406A EP0377995A2 EP 0377995 A2 EP0377995 A2 EP 0377995A2 EP 89313406 A EP89313406 A EP 89313406A EP 89313406 A EP89313406 A EP 89313406A EP 0377995 A2 EP0377995 A2 EP 0377995A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- mix
- coal
- process according
- binder
- magnesium oxide
- 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.)
- Withdrawn
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L5/00—Solid fuels
- C10L5/02—Solid fuels such as briquettes consisting mainly of carbonaceous materials of mineral or non-mineral origin
- C10L5/06—Methods of shaping, e.g. pelletizing or briquetting
- C10L5/10—Methods of shaping, e.g. pelletizing or briquetting with the aid of binders, e.g. pretreated binders
Definitions
- the present invention concerns a briquetting process. More especially it concerns such a process which gives improved cure rate and green strength in "cold" briquetting, that is briquetting at temperatures of up to 100°C.
- magnesium oxide accelerates the rate of cure. Magnesium oxide has been found, in particular, to impart a significant improvement to the green shatter resistance of molasses/phosphoric acid bound briquettes.
- the present invention provides a process for the cold briquetting of fine coal, comprising mixing fine coal with a binder utilising phosphoric acid to produce a water-containing briquetting mix, and characterised by the presence in the briquetting mix, preferably in an amount of up to 2% by weight of the mix of magnesium oxide, and briquetting the mix, whereby the green shatter strength, the hot crushing strength of the resulting briquettes during curing and/or the water resistance of the cured briquettes are improved.
- the binder is a combination of molasses and optionally an organic hardening agent, or a sugar solution, together with phosphoric acid and we refer to our prior applications mentioned above for examples of such binders.
- Molasses/phosphoric acid binder is particularly preferred.
- Preferred coals are high rank non-caking coals, especially those having low smoke emissions such as anthracite.
- the coal is of a particular size mainly below 3mm, and anthracite duff is especially suitable.
- the invention is also applicable to coals for power stations or steam raising and to coal blends containing coking coal components and/or treated coals, e.g. by mild oxidation or pyrolysis.
- the coal may be crushed or be the direct product of coal cutting.
- the briquetting step of the present invention includes all methods of forming agglomerates from fine coal, and these agglomerates may be of any size or shape according to market requirements. There may be mentioned forming agglomerates by extrusion, ringroll or roll-pressing, die-pressing, rotary table pressing and pelletising, e.g. on a disc pelletiser.
- the hardening (curing) stage in the briquetting process is preferably carried out at temperature of the order of 200 o C to 300 o C for up to an hour.
- Hot curing may be conveniently carried out by passing the briquettes on a conveyor through an oven, in an atmosphere which may contain nitrogen, carbon dioxide, water vapour and/or oxygen.
- Anthracite duff (88 parts, - 1.7mm particle size) was mixed with iron ore (1 part) and binder (11 parts) by weight.
- the binder was a mixture providing molasses (10 parts) and phosphoric acid (1 part).
- the mixture was briquetted in a pilot plant roll press, and the briquettes produced were tested for green crushing strength, green shatter resistance, hot crushing strength (at 250oC) and water resistance.
- the properties of the control mix were compared with those of a similar mix containing 1% w/w of magnesium oxide additive.
- the results shown in the attached table indicate a significant increase in the green shatter resistance and hot crushing strength of the briquettes and in their water resistance. Similar results were obtained whether the magnesium oxide additive was added before or after the binder.
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
Abstract
Description
- The present invention concerns a briquetting process. More especially it concerns such a process which gives improved cure rate and green strength in "cold" briquetting, that is briquetting at temperatures of up to 100°C.
- Our U.K. Patent Number 2,187,754B discusses a variety of cold coal briquetting processes and discloses a useful process utilising a combination of molasses and inorganic hardening agent as binder. Our co-pending U.K. Published Patent application Number 2 209 763A discloses a variation of the process of GB 2,187,754B in its use of concentrated sugar solutions. The disclosures of both these applications are incorporated herein by reference.
- A great many cold briquetting processes, in which a water-containing binder is used, while apparently producing satisfactory briquettes of adequate final strength and combustion characteristics, result in green briquettes of inadequate initial strength and water resistance. That is to say, the briquette, when emerging from the briquette forming step are easily broken. In practice on the industrial scale, further handling of the green briquettes and hot curing thereof can result in undesirably high breakages and loss of complete briquettes, requiring recycle of broken briquette pieces or the acceptance of less desirable and less valuable product.
- It has now been discovered that the incorporation of minor quantities of magnesium oxide into a water-containing mixture of coal and binder, especially under the normal operating temperatures of industrial processing, yields worthwhile improvements in green shatter resistance, final curing strength and water resistance of the cured briquette combined with undiminished or only slightly diminished green crushing strength. Additionally, magnesium oxide accelerates the rate of cure. Magnesium oxide has been found, in particular, to impart a significant improvement to the green shatter resistance of molasses/phosphoric acid bound briquettes.
- The present invention provides a process for the cold briquetting of fine coal, comprising mixing fine coal with a binder utilising phosphoric acid to produce a water-containing briquetting mix, and characterised by the presence in the briquetting mix, preferably in an amount of up to 2% by weight of the mix of magnesium oxide, and briquetting the mix, whereby the green shatter strength, the hot crushing strength of the resulting briquettes during curing and/or the water resistance of the cured briquettes are improved.
- Desirably, the binder is a combination of molasses and optionally an organic hardening agent, or a sugar solution, together with phosphoric acid and we refer to our prior applications mentioned above for examples of such binders. Molasses/phosphoric acid binder is particularly preferred.
- Preferred coals are high rank non-caking coals, especially those having low smoke emissions such as anthracite. Desirably the coal is of a particular size mainly below 3mm, and anthracite duff is especially suitable. The invention is also applicable to coals for power stations or steam raising and to coal blends containing coking coal components and/or treated coals, e.g. by mild oxidation or pyrolysis. The coal may be crushed or be the direct product of coal cutting.
- The briquetting step of the present invention includes all methods of forming agglomerates from fine coal, and these agglomerates may be of any size or shape according to market requirements. There may be mentioned forming agglomerates by extrusion, ringroll or roll-pressing, die-pressing, rotary table pressing and pelletising, e.g. on a disc pelletiser.
- The hardening (curing) stage in the briquetting process, to give the required strength and water resistance of the product, is preferably carried out at temperature of the order of 200oC to 300oC for up to an hour. Hot curing may be conveniently carried out by passing the briquettes on a conveyor through an oven, in an atmosphere which may contain nitrogen, carbon dioxide, water vapour and/or oxygen.
- The present invention will now be described by way of example only.
- Anthracite duff (88 parts, - 1.7mm particle size) was mixed with iron ore (1 part) and binder (11 parts) by weight. The binder was a mixture providing molasses (10 parts) and phosphoric acid (1 part). The mixture was briquetted in a pilot plant roll press, and the briquettes produced were tested for green crushing strength, green shatter resistance, hot crushing strength (at 250oC) and water resistance. The properties of the control mix were compared with those of a similar mix containing 1% w/w of magnesium oxide additive. The results shown in the attached table indicate a significant increase in the green shatter resistance and hot crushing strength of the briquettes and in their water resistance. Similar results were obtained whether the magnesium oxide additive was added before or after the binder.
TABLE Influence of Magnesium Oxide on the Green Strength and Cure Rate of Molasses/Phosphoric Acid Bound Briquettes ADDITIVE CONTROL 1% MAGNESIUM OXIDE 10lb Green Shatter + 1 1/4 35 71 + 7/8 42 78 Green Crushing Strength (Kg) 3.7 3.5 Hot Crushing Strength (Kg) (Curing Time - mins) 5 2.5 4.1 10 7.8 9.1 15 21.1 47.3 20 71.9 89.4 25 92.2 129.2 30 105.7 125.2 24 hour Water Resistance (Kg) (Curing Time - mins) 5 D D 10 3.2 10.2 15 27.0 68.6 20 93.5 126.9 25 109.0 141.9 30 101.4 149.7
Claims (6)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8900631 | 1989-01-12 | ||
GB8900631A GB2227023A (en) | 1989-01-12 | 1989-01-12 | Briquetting process |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0377995A2 true EP0377995A2 (en) | 1990-07-18 |
EP0377995A3 EP0377995A3 (en) | 1990-09-05 |
Family
ID=10649920
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19890313406 Withdrawn EP0377995A3 (en) | 1989-01-12 | 1989-12-21 | Briquetting process |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0377995A3 (en) |
GB (1) | GB2227023A (en) |
ZA (1) | ZA899782B (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0566034A1 (en) * | 1992-04-14 | 1993-10-20 | SOPHIA-JACOBA GmbH | Cold briquetted coal |
WO2002050219A1 (en) * | 2000-12-19 | 2002-06-27 | Posco | Coal briquette having superior strength and briquetting method thereof |
WO2004020555A1 (en) * | 2002-09-02 | 2004-03-11 | Posco | Coal briquettes for smelting reduction process, and method for manufacturing the same |
US7129371B2 (en) * | 2002-07-02 | 2006-10-31 | Ferro Corporation | Benzene phosphinic acid with improved flowability |
US7566807B2 (en) | 2006-09-14 | 2009-07-28 | Novolyte Technologies Inc. | Benzene phosphinic acid with improved flowability |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105296045A (en) * | 2015-11-23 | 2016-02-03 | 广西金壮锦节能技术有限公司 | High viscosity briquette waterproof composite binder |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2138442A (en) * | 1983-04-23 | 1984-10-24 | Akzo Nv | Fuel briquettes |
GB2187754A (en) * | 1986-03-14 | 1987-09-16 | Coal Ind | Coal briquetting process |
GB2209763A (en) * | 1987-09-16 | 1989-05-24 | Coal Ind | Coal briquetting process |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4165221A (en) * | 1978-10-24 | 1979-08-21 | Ohio & Penna. Fuels, Inc. | Formed carbon fuel briquettes, process for forming the same and process for utilizing the same in the manufacture of steel |
SU1010146A1 (en) * | 1981-07-06 | 1983-04-07 | Московский Ордена Трудового Красного Знамени Горный Институт | Method for making coal and ore briquets |
-
1989
- 1989-01-12 GB GB8900631A patent/GB2227023A/en not_active Withdrawn
- 1989-12-20 ZA ZA899782A patent/ZA899782B/en unknown
- 1989-12-21 EP EP19890313406 patent/EP0377995A3/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2138442A (en) * | 1983-04-23 | 1984-10-24 | Akzo Nv | Fuel briquettes |
GB2187754A (en) * | 1986-03-14 | 1987-09-16 | Coal Ind | Coal briquetting process |
GB2209763A (en) * | 1987-09-16 | 1989-05-24 | Coal Ind | Coal briquetting process |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0566034A1 (en) * | 1992-04-14 | 1993-10-20 | SOPHIA-JACOBA GmbH | Cold briquetted coal |
WO2002050219A1 (en) * | 2000-12-19 | 2002-06-27 | Posco | Coal briquette having superior strength and briquetting method thereof |
CN1309844C (en) * | 2000-12-19 | 2007-04-11 | Posco公司 | Coal briquette having superior strength and briquetting method thereof |
US7129371B2 (en) * | 2002-07-02 | 2006-10-31 | Ferro Corporation | Benzene phosphinic acid with improved flowability |
WO2004020555A1 (en) * | 2002-09-02 | 2004-03-11 | Posco | Coal briquettes for smelting reduction process, and method for manufacturing the same |
CN1328358C (en) * | 2002-09-02 | 2007-07-25 | Posco公司 | Coal briquettes for smelting reduction process, and method for manufacturing the same |
US7566807B2 (en) | 2006-09-14 | 2009-07-28 | Novolyte Technologies Inc. | Benzene phosphinic acid with improved flowability |
Also Published As
Publication number | Publication date |
---|---|
EP0377995A3 (en) | 1990-09-05 |
ZA899782B (en) | 1990-09-26 |
GB2227023A (en) | 1990-07-18 |
GB8900631D0 (en) | 1989-03-08 |
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