CA2796899C - Method for incinerating carbon-containing dry metallic ash - Google Patents

Method for incinerating carbon-containing dry metallic ash Download PDF

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Publication number
CA2796899C
CA2796899C CA2796899A CA2796899A CA2796899C CA 2796899 C CA2796899 C CA 2796899C CA 2796899 A CA2796899 A CA 2796899A CA 2796899 A CA2796899 A CA 2796899A CA 2796899 C CA2796899 C CA 2796899C
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CA
Canada
Prior art keywords
hearth
level
level hearth
openings
space
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 - Fee Related
Application number
CA2796899A
Other languages
French (fr)
Other versions
CA2796899A1 (en
Inventor
Steffen Voss
Jan Schapp
Norbert Ritschel
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.)
Heraeus Deutschland GmbH and Co KG
Original Assignee
Heraeus Precious Metals GmbH and Co KG
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 Heraeus Precious Metals GmbH and Co KG filed Critical Heraeus Precious Metals GmbH and Co KG
Publication of CA2796899A1 publication Critical patent/CA2796899A1/en
Application granted granted Critical
Publication of CA2796899C publication Critical patent/CA2796899C/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22BPRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B7/00Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23GCREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/002Incineration of waste; Incinerator constructions; Details, accessories or control therefor characterised by their grates
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22BPRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B7/00Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/001Dry processes
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22BPRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00Preliminary treatment of ores or scrap
    • C22B1/02Roasting processes
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22BPRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B11/00Obtaining noble metals
    • C22B11/02Obtaining noble metals by dry processes
    • C22B11/021Recovery of noble metals from waste materials
    • C22B11/023Recovery of noble metals from waste materials from pyrometallurgical residues, e.g. from ashes, dross, flue dust, mud, skim, slag, sludge
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23GCREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/50Control or safety arrangements
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23GCREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G7/00Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/20Recycling

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Metallurgy (AREA)
  • Environmental & Geological Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Gasification And Melting Of Waste (AREA)
  • Processing Of Solid Wastes (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Air Supply (AREA)

Abstract

The invention is directed to a device for incinerating carbon-containing dry metallic ash. The device comprises a trough (a1 ) which comprises a first level hearth (b2), which comprises first openings (c3), metal fibres (d4) arranged below the first level hearth (b2) and above a second level hearth (e5) which form a space (d4a) between the first level hearth (2b) and the second level hearth (e5). The second level hearth (e5) is arranged parallel to the first level hearth (b2) and has second openings (f6) that are arranged at an offset from said first openings (c3). The first level hearth (b2) and the second level hearth (e5) are connected by a connecting means (g7) in such manner that metal fibres (d4) are held firmly between the first level hearth (2b) and the second level hearth (e5). A space (h8) is provided below the second level hearth (e5) to which means (i9) for supplying air or/and oxygen are provided.

Description

Method for incinerating carbon-containing dry metallic ash The invention relates to a method for incinerating carbon-containing dry metallic ash and a de-vice for implementing said method.
Metallic ash is understood to be the product of primary incineration of recycling material that contains plastic materials and solvents and is to be reprocessed for its noble metal content. No-ble metals can be present in recycling material of this type either in elemental or chemically bound form, e.g. as salts or oxides. The metallic ash can therefore also contain these substanc-es.
Following primary incineration/carbonisation, said ashes still contain substantial fractions of car-bon that should be removed before further recycling steps and/or should be reduced to a frac-tion of less than 3 %.
US4360380/DE3134733A1 specifies a metal recycling method, in which the incineration of or-ganic fractions is carried out at temperatures below the slag formation temperature of the sili-cate fractions. This is aimed at preventing valuable metals from being included in glass:
"The slag formation temperature of quartz is approx. 760 C. Accordingly, if the incineration pro-ceeds at a temperature between 315 and 480 C and in the presence of sufficient oxygen or of an excess of oxygen with adequate stirring, it has been found that the organic fraction is incin-erated without undesirable silicates being formed."
Accordingly, DE3134733A1 describes a method having the following features:
"Method for recycling selected metal fractions from quartz-containing sludges by incinerating the sludge in order to disintegrate organic fractions followed by acidic leaching of the ash and hy-drometallurgical recovery of the metal fractions from the remaining solid and liquid residues, whereby the incineration is carried out at a temperature below the slag formation temperature of silicates in order to prevent metal fractions from being occluded in glass matrices that are not attacked by the subsequent acidic leaching and the hydrometallurgical procedural steps."
According to DE3134733A1, the process is carried out in a furnace. The efficiency of the pro-cess is said to be increased through stirring and supplying air: "Moreover, it has been evident
2 that stirring of the sludge aimed at keeping the temperature at an even level throughout and increasing the access of oxygen to the organic material, improved the method significantly. Ob-viously, stirring or forced aeration are used in one way or another in many sludge incineration facilities and are not considered to be novel features as such".
In contrast, the present invention provides a method for incinerating carbon-containing slags in open troughs through overturning on air and includes additional aeration from below. Consistent with DE3134733A1, the prior art is the incineration in open troughs with frequent overturning by means of rakes. Additional aeration from below according to the invention surprisingly reduces the duration of the incineration process by 50 to 80%. This is more than an additive effect and rather represents a surprising synergism. Additional aeration from below according to the inven-tion surprisingly reduces the duration of the incineration process by 50 to 80%. This is more than an additive effect and rather represents a surprising synergism. It also needs to be noted that the material burns more rapidly after ignition. The overturning by means of rakes is kept for expedient reasons to ensure that no crusts are formed at the hearth region of the troughs or on the surface of the incinerated goods. The carbon content is reduced to less than 3%.
The overturning by means of rakes is kept for expedient reasons to ensure that no crusts are formed at the hearth region of the troughs or on the surface of the incinerated goods. The car-bon content is reduced to less than 3%.
Another option is to enrich the air, which is blown-in from below, with oxygen in order to improve the efficiency of incineration.
According to an essential feature of the method according to the invention, any reverse transport of ash is prevented whereas the supply of air and/or oxygen is maintained.
In detail, the method comprises the steps of:
a) adding metallic ash into a trough;
b) aerating from above with ambient air;
c) injecting air and/or oxygen through the trough hearth;
d) establishing the ignition temperature;
e) stirring of the metallic ash by means of a suitable tool;
f) whereby the carbon content is reduced to less than 3%;
3 whereby steps b), c), and d) can proceed concurrently or in alternating order or pairs or all of these steps can proceed concurrently;
step d) can just as well proceed selectively in partial quantities of the metallic ash;
and the reverse transport of ash through the trough hearth is prevented, whereas the supply of air and/or oxygen is maintained.
In a convenient embodiment, the incineration process is carried out in a multiple hearth incinera-tor at the open top of the trough exposed to ambient air and by means of injecting air from be-low. The time for the carbon fraction to reach a level below 3% is 2 hours.
The invention also relates to a device for incinerating carbon containing dry metallic ash in the form of a container, preferably a trough, that comprises a hearth that is aerated from below.
The hearth comprises means preventing the ash from dropping through the grate, whereas the supply of air and/or oxygen from below is not obstructed.
Preferably, the invention provides a hollow double-hearth trough having an upper hearth and a lower hearth. Openings, such as, e.g., holes or slits, in the upper and lower hearth ensure the supply of air from below, whereas metal fibres, such as a wire mesh or similar material, in the space between the hearths ensures that the ash cannot fully drop through the two hearths. In addition, it is expedient for the openings to be situated not directly across from each other, which results in favourable flow conditions from the start.
Overall, the feature of having a metal fibre-containing double-hearth trough provides a surpris-ingly simple solution allowing the desired substance transport from below to proceed while suffi-ciently impeding the undesired substance transport from above.
Flow guides are another expedient feature that further optimises the flow conditions provided they are situated properly.
The fibres can be present as woven material, fabric, non-woven fabric or knitted material. Pref-erably, they are knitted.
4 Fig. 1 shows a preferred embodiment of the device.
This comprises a) a trough al b) having a level hearth b2, c) whereby hearth b2 comprises openings c3, d) with metal fibres d4 being arranged below hearth b2 and forming a space d4a, which is closed in downward direction through e) another trough hearth e5 that is arranged parallel to hearth b2 f) having further openings f6 that are arranged at an offset from said openings c3, whereby g) hearth e5 and hearth b2 are connected by means of connecting means g7 in such man-ner that metal fibres d4 are firmly occluded, and h) a space h8 is provided below hearth e5 to which i) means i9 for supplying air or/and oxygen are provided.
Flow guides for optimising the air circulation can be provided in space (h8).
The metal fibres (d4) can be present as woven material, fabric, fleece or knitted material.
Preferably, they are knitted.

Claims (3)

claims
1. A device for incinerating carbon-containing dry metallic ash comprising:
a trough (a1) comprising:
i) a first level hearth (b2), which comprises first openings (c3);
ii) metal fibres (d4) arranged below the first level hearth (b2) and above a second level hearth (e5) which form a space (d4a) between the first level hearth (2b) and the second level hearth (e5);
iii) the second level hearth (e5) being arranged parallel to the first level hearth (b2); and iv) the second level hearth (e5) having second openings (f6) that are ar-ranged at an offset from said first openings (c3);
wherein the first level hearth (b2) and the second level hearth (e5) are connected by means of connecting means (g7) in such manner that metal fibres (d4) are held firmly be-tween the first level hearth (2b) and the second level hearth (e5); and a space (h8) is provided below the second level hearth (e5) to which means (i9) for supplying air or/and oxygen are provided.
2. The device according to claim 1, wherein flow guides (j) for optimising the air circulation are provided in the space (h8).
3. The device according to claim 1 or 2, wherein the metal fibres (d4) are in a form selected from the group consisting of a woven material, a fabric, a fleece and a knitted material.
CA2796899A 2011-12-22 2012-11-27 Method for incinerating carbon-containing dry metallic ash Expired - Fee Related CA2796899C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201110122139 DE102011122139A1 (en) 2011-12-22 2011-12-22 Process for burning off carbonaceous dry metallic ash
DE102011122139.9 2011-12-22

Publications (2)

Publication Number Publication Date
CA2796899A1 CA2796899A1 (en) 2013-06-22
CA2796899C true CA2796899C (en) 2016-03-29

Family

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Family Applications (1)

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CA2796899A Expired - Fee Related CA2796899C (en) 2011-12-22 2012-11-27 Method for incinerating carbon-containing dry metallic ash

Country Status (15)

Country Link
US (1) US20130167760A1 (en)
EP (1) EP2607505B1 (en)
JP (1) JP5805061B2 (en)
KR (1) KR101579343B1 (en)
CN (1) CN103184342B (en)
AR (1) AR089191A1 (en)
AU (1) AU2012258436B2 (en)
CA (1) CA2796899C (en)
CL (1) CL2012003559A1 (en)
DE (1) DE102011122139A1 (en)
MX (1) MX2012014902A (en)
PL (1) PL2607505T3 (en)
RU (1) RU2012155871A (en)
SG (1) SG191495A1 (en)
TW (1) TWI491737B (en)

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4147114A (en) * 1977-11-04 1979-04-03 Thiokol Corporation Waste treatment system
US4308034A (en) * 1980-05-19 1981-12-29 Hoang Dinh C Apparatus for incinerating and gasifying biomass material
US4360380A (en) 1980-09-09 1982-11-23 World Resources Company Process for recovery of metal values from sludges
US4385567A (en) * 1980-10-24 1983-05-31 Solid Fuels, Inc. Solid fuel conversion system
US4466358A (en) * 1981-06-04 1984-08-21 Christian J Vernon Solid fuel warm air furnace
US4450776A (en) * 1983-06-10 1984-05-29 Stevenson Robert L Industrial furnace
JPS6246117A (en) * 1985-08-20 1987-02-28 Tsurumi Gosei Rozai Kk Gasifying burner for solid combustion matter
DE4344906C2 (en) * 1993-12-29 1997-04-24 Martin Umwelt & Energietech Process for controlling individual or all factors influencing the combustion on a grate
US5605142A (en) * 1994-04-04 1997-02-25 Parker, Inc. Portable barbeque
US5868084A (en) * 1995-03-20 1999-02-09 U.S. Scientific, L.L.C. Apparatus and process for carbon removal from fly ash
JP4270688B2 (en) * 1999-11-22 2009-06-03 日陶科学株式会社 Cylindrical handy firing jig
JP3873274B2 (en) * 2001-07-17 2007-01-24 三菱マテリアル株式会社 Prefabricated precious metal clay baking equipment
US7017500B2 (en) * 2004-03-30 2006-03-28 International Paper Company Monitoring of fuel on a grate fired boiler
US7776284B2 (en) * 2006-04-19 2010-08-17 Kusatsu Electric Co., Ltd. Apparatus of catalyst-circulation type for decomposing waste plastics and organics, and system thereof
JP4380783B2 (en) * 2006-04-19 2009-12-09 草津電機株式会社 Waste plastic / organic decomposition method, decomposition apparatus and decomposition system
DE202009013233U1 (en) * 2009-10-01 2010-03-04 Müller, Jürgen Safety fireplace

Also Published As

Publication number Publication date
EP2607505A1 (en) 2013-06-26
CN103184342A (en) 2013-07-03
US20130167760A1 (en) 2013-07-04
JP5805061B2 (en) 2015-11-04
TWI491737B (en) 2015-07-11
KR101579343B1 (en) 2015-12-21
SG191495A1 (en) 2013-07-31
CN103184342B (en) 2016-08-03
PL2607505T3 (en) 2016-11-30
TW201331379A (en) 2013-08-01
KR20130079171A (en) 2013-07-10
JP2013134053A (en) 2013-07-08
CL2012003559A1 (en) 2014-07-04
MX2012014902A (en) 2013-06-21
RU2012155871A (en) 2014-06-27
DE102011122139A1 (en) 2013-06-27
AU2012258436A1 (en) 2013-07-11
CA2796899A1 (en) 2013-06-22
AR089191A1 (en) 2014-08-06
AU2012258436B2 (en) 2014-12-04
EP2607505B1 (en) 2016-05-25

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Effective date: 20140131

MKLA Lapsed

Effective date: 20181127