GB2337257A - Treating aqueous sludge waste; additives for furnaces - Google Patents
Treating aqueous sludge waste; additives for furnaces Download PDFInfo
- Publication number
- GB2337257A GB2337257A GB9810091A GB9810091A GB2337257A GB 2337257 A GB2337257 A GB 2337257A GB 9810091 A GB9810091 A GB 9810091A GB 9810091 A GB9810091 A GB 9810091A GB 2337257 A GB2337257 A GB 2337257A
- Authority
- GB
- United Kingdom
- Prior art keywords
- waste
- agglomerates
- particulates
- aqueous sludge
- dry
- 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.)
- Granted
Links
- 239000002699 waste material Substances 0.000 title claims abstract description 10
- 239000010802 sludge Substances 0.000 title claims abstract description 9
- 239000000654 additive Substances 0.000 title claims description 6
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 10
- 235000012255 calcium oxide Nutrition 0.000 claims abstract description 5
- 239000000292 calcium oxide Substances 0.000 claims abstract description 5
- 239000003500 flue dust Substances 0.000 claims abstract description 5
- 239000003575 carbonaceous material Substances 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 11
- 239000000126 substance Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 230000000996 additive effect Effects 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 238000002347 injection Methods 0.000 abstract description 6
- 239000007924 injection Substances 0.000 abstract description 6
- 239000002184 metal Substances 0.000 abstract description 4
- 229910052751 metal Inorganic materials 0.000 abstract description 4
- 238000007605 air drying Methods 0.000 abstract description 3
- 239000000571 coke Substances 0.000 abstract description 3
- 239000000428 dust Substances 0.000 abstract description 3
- 239000003245 coal Substances 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 description 7
- 239000002245 particle Substances 0.000 description 7
- 239000004568 cement Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000010808 liquid waste Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000010310 metallurgical process Methods 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/243—Binding; Briquetting ; Granulating with binders inorganic
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working 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
- C22B7/02—Working-up flue dust
-
- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
-
- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Structural Engineering (AREA)
- Inorganic Chemistry (AREA)
- Geochemistry & Mineralogy (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Treatment Of Sludge (AREA)
Abstract
Metal-containing aqueous sludge waste is mixed with a carbonaceous substance, e.g.coal or coke dust, and a hydratable waste, e.g.quicklime, to form agglomerates which are caused to interact to form dry, cool particulates. The aqueous waste may contain millscale and the agglomerates may be subjected to forced air drying to yield the dry particulates. Flue dust may be added to the particulates before they are conveyed peumatically to the injection inlet of a furnace.
Description
1 MAKING INJECTABLE ADDITIVES FOR FURNACES 2337257 The invention relates
to making additives for pneumatic injection into furnaces used for melting metal or making cement; or the Ew.
In our patent EP-0499779 there is deanffied and claimed a method for treating a mixture of solid and liquid waste mas which contain metal and non-metal impurities, such as rolling scale sludge, inWbch the waste materials are mixed with fly ash and/or coke and quicklime until the content of the waste material is bound to such an extent that agglomerates are so that after screening and drying, either in air or by the application of heat, are stable for injection into a metallurgical process or for cement manufacture.
W - h The method of the earlier patent works wed but the drying by storage in air is slow and the alternative of applying heat to dry the agglomerates is energy intensive.
An exothern-iic chemical reaction occurs within the agglomerates, largely caused by hydration which, after cooling, re in dry particles that can be injected pneumatically into a vessel such as a 4bWurgical furnace or a cement kiln. This reaction and cooling step can take som6-Ohe to complete.
It is one object of the invention to provide nwans for the purpose specified in which the 2 time is reduced and there are other advantages.
According to the present invention there is provided a method of making an additive for addition to a ffirnace, the method comprising mixing metal-containing aqueous sludge waste, with a carbonaceous substance and a hydratable substance to form agglomerates and then causing the agglomerates to chemically interact in a short time period to form dry cool particulates.
Because the particles are made substantially dry and cool quickly it is possible to add other waste materials to the particles and inject them together. This is especially true of materials which may be affected by the moisture or temperature of the incompletely dry or cool particles or which when mixed with the incompletely dry or cool particles cannot be moved pneumatically. One such category of materials is flue dust which can contain zinc or lead which are additives used in steel making and otherwise difficult to dispose of.
It is a preferred feature of the invention that the chemical reaction is caused to take place in an elongate vessel arranged to move the incoming mixture from an inlet to an outlet. The vessel is rotated and may be set in an incline or otherwise disposed or shape to encourage the substances to move towards the outlet. Forced air drying may be employed. Advantageously the speed of movement and forced air drying are arranged so that the time interval from inlet to outlet is about 30 nfinutes to about 90 minutes, preferably about an hour.
3 The carbonaceous substance and the hydratable substance may be selected from those instanced in the earlier patent.
In order for that the invention may be wed understood it will now be described by way of example only with reference to the aanying drawing in which Figure 1 is a flow diagram.
The apparatus comprises three hopp3 which contain respectively the sludge (excavated from a lagoon or the like), or coke dust and quicklime. The sludge may be oily millscale and water. Pipes Ind from the hoppers to a forced mixer, 4, the pipes including screw feed conveyors 5. Weigh device 6 may be present The mixture is passed on a conveyor, not shown, to a bopper 7 from which it is supplied to the inlet 8 of an elongate vessel 9. That vessel 9 is rotated on wheels 10 by conventional driver. The outlet 11 of vessel 9 leads to a hopper 12. The outlet of the hopper 12 leads to a mixer 13 which is connected to hopper containing a flue dust. In one example the vessel is 7200 mm long and 1800 mm hder. The material enters at the inlet and unheated air is blown from the outlet to the inlet.
The mixture from the mixer 11 is to injection equipment, not shown, for injection into a furnace.
In the method of the invention, materW!g drawn from the hoppers 1, 2, 3 in a weight ratio of sludge: coal: quicklime of 20: 5. The mixture is mixed in the mixer 4 to form agglomerates which are con to the hopper 7. The agglomerates are fed 4 into the elongate vessel 9 and are passed by rotation of the vessel to the outlet 11. Air is forced through the vessel 9 to cool the agglomerates as the exothermic hydration reaction takes place so that within about one hour dry particulates emerge. These are then blown into the hopper 12 and then passed to the mixer 13. Flue dust from the hopper 14 is also fed to the mixer. The formed mixture of particles is dry and easily conveyed pneumatically along pipework to the injection inlet of a furnace, not shown.
Because the agglomerates are converted quickly and efficiently into dry particles when the fine dust is added the mixture does not form lumps which cannot easily be blown. The process is speedy and efficient overall.
Claims (1)
- CLAILMS1. A method of making an additive for addition to a furnace, the method comprising mixing metal-containigg aqueous sludge waste with a carbonaceous substance and a hydratable waste to form agglomerates and then causing the agglomerates to chemically inte in a short time period to form dry cool particulates.2. A method according to Claim 1 wherein the short time period is between about 0.5 and about 1.5 hours.A method according to Claim 1 or 2 wherein the particulates are mixed with flue dust prior to pneumatic i4effi.m into a ffirnace.A method according to Claim 2 or 3 wherein the hydratable substance is quicklime.5. A method according to any g claim wherein the aqueous sludge contains millscale.6. A method according to Claim 5 wherein the millscale is oily.KT/MA1/11.5.98 P2OUGB.D&A
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9810091A GB2337257B (en) | 1998-05-11 | 1998-05-11 | Making injectable additives for furnaces |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9810091A GB2337257B (en) | 1998-05-11 | 1998-05-11 | Making injectable additives for furnaces |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9810091D0 GB9810091D0 (en) | 1998-07-08 |
| GB2337257A true GB2337257A (en) | 1999-11-17 |
| GB2337257B GB2337257B (en) | 2001-12-12 |
Family
ID=10831860
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9810091A Expired - Fee Related GB2337257B (en) | 1998-05-11 | 1998-05-11 | Making injectable additives for furnaces |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2337257B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000065106A1 (en) * | 1999-04-22 | 2000-11-02 | Voest-Alpine Industrieanlagenbau Gmbh | Method of producing slurry-coated feed stock to be used for a direct reduction process |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996031630A1 (en) * | 1995-04-04 | 1996-10-10 | Heckett Multiserv Plc | Reuse of metallurgical fines |
| US5607505A (en) * | 1991-01-24 | 1997-03-04 | Osing; Dirk | Waste treatment process |
| GB2324081A (en) * | 1997-04-07 | 1998-10-14 | Heckett Multiserv Plc | Additives for Electric Arc Furnace |
-
1998
- 1998-05-11 GB GB9810091A patent/GB2337257B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5607505A (en) * | 1991-01-24 | 1997-03-04 | Osing; Dirk | Waste treatment process |
| WO1996031630A1 (en) * | 1995-04-04 | 1996-10-10 | Heckett Multiserv Plc | Reuse of metallurgical fines |
| GB2324081A (en) * | 1997-04-07 | 1998-10-14 | Heckett Multiserv Plc | Additives for Electric Arc Furnace |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000065106A1 (en) * | 1999-04-22 | 2000-11-02 | Voest-Alpine Industrieanlagenbau Gmbh | Method of producing slurry-coated feed stock to be used for a direct reduction process |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9810091D0 (en) | 1998-07-08 |
| GB2337257B (en) | 2001-12-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20030511 |