CA1148411A - Furnace for treating industrial wastes - Google Patents
Furnace for treating industrial wastesInfo
- Publication number
- CA1148411A CA1148411A CA000348286A CA348286A CA1148411A CA 1148411 A CA1148411 A CA 1148411A CA 000348286 A CA000348286 A CA 000348286A CA 348286 A CA348286 A CA 348286A CA 1148411 A CA1148411 A CA 1148411A
- Authority
- CA
- Canada
- Prior art keywords
- furnace
- bed
- combustion gas
- supplying
- combustion
- 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
Links
- 239000002440 industrial waste Substances 0.000 title claims abstract description 15
- 239000000567 combustion gas Substances 0.000 claims abstract description 23
- 239000007789 gas Substances 0.000 claims abstract description 21
- 238000002485 combustion reaction Methods 0.000 claims abstract description 18
- 239000003575 carbonaceous material Substances 0.000 claims abstract description 10
- 230000008018 melting Effects 0.000 claims abstract description 6
- 238000002844 melting Methods 0.000 claims abstract description 6
- 238000007599 discharging Methods 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 229920000136 polysorbate Polymers 0.000 claims 2
- 206010037660 Pyrexia Diseases 0.000 claims 1
- 239000002699 waste material Substances 0.000 abstract description 25
- 239000010801 sewage sludge Substances 0.000 abstract 1
- 239000000428 dust Substances 0.000 description 11
- 238000010276 construction Methods 0.000 description 5
- 239000000571 coke Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000010865 sewage Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 239000002956 ash Substances 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 235000002918 Fraxinus excelsior Nutrition 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 239000010920 waste tyre Substances 0.000 description 1
Landscapes
- Gasification And Melting Of Waste (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A furnace for treating sewage sludge, ash from municipal incinerators or other industrial wastes by melting the waste with a high-temperature bed formed from a combustible carbonaceous material for the reuse of the resulting molten product, for example, as aggregate. A gas for combustion is supplied to the bed at an intermediate portion between its upper and lower portions while causing the resulting combustion gas to flow through the bed dividedly upward and downward .
A furnace for treating sewage sludge, ash from municipal incinerators or other industrial wastes by melting the waste with a high-temperature bed formed from a combustible carbonaceous material for the reuse of the resulting molten product, for example, as aggregate. A gas for combustion is supplied to the bed at an intermediate portion between its upper and lower portions while causing the resulting combustion gas to flow through the bed dividedly upward and downward .
Description
BACKGROUND OF THE INVENTION
The present invention relates to a furnace for treating sludges from sewage treatment processes, industrial wastes, or wastes which are crushed, dried, burned or other-wise semi-treated as desired, by melting the waste with a high-temperature furnace bed of combustible carbonaceous substance - to draw off a molten product from the bottom of the bed so that the product can be used, for example, for construction purposes as an aggregate, or for reclamation without entailing the release of heavy metals.
Since low initial cost and reduced running cost are usually essential requirements for furnaces for treating industrial wastes, it is desired that such furnaces be dir-ectly heated with a combustible carbonaceous material, for example~ with coke. To assure combustion for giving a high temperature needed for melting the waste, air or like gas must then be supplied to the combustible material at a high rate. What matters is therefore how to supply the gas for combustion.
With a simple system in which air or like ~'`
~..~....
, '''. . -~: ;
.
~8~
gas is fed to a high-temperature furnace bed of combustible carbonaceous material from below to effect combustion to cause the resulting combustion gas to flow upward, dust of the waste and ash (hereinafter - -5 referred to simply as "dust") are exposed to, and _ _ scattered upward by, a large quantity of combustion gas flowing at a high speed, with the result that the dust will be released from the furnace as entrained in the combustion gas. The exhaust gas is therefore very likely to cause secondary pollution, or clog up, d ~ ge or overheat the exhaust duct due to the deposition of molten dust.
; Conversely with another system in which the gas for combustion is fed to the high-temperature furnace bed from above to cause the resulting combus-tion gas to flow downward, the water contained in the waste will flow down along with the combustion gas, giving a reduced temperature to the lower portion of the bed. Additionally the carbon dioxide and water resulting from the combustion of the waste, or the water initially contained in the waste also flows downward with the combustion gas, undergoing reduction reaction with the carbon component of the combustible carbonaceous material in the lower portion o~ the furnace bed to absorb the ambient heat and eventually .
reducing the temperature of the lower portlon of the bed.
At a reduced temperature, the molten product will block up and will not be run off from the furnace smoothly.
Presumably secondary pollution and other objections due to the exhaust gas could be prevented with use of a secondary combustion chamber or combustion promoting device, or by returning the exhaust gas into the furance, while an additional heater, if provided for the lower portion of the bed, would be useful for keeping this portion at the desired . high temperature. Such means, however, would render the furnace construction complex and result in an increase in the initial cost as well as in the running cost due to damage to the structure, thus failing to fulfill the foregoing requirements.
SUMMARY OF THE INVENTION
The main object of this invention is to provide a furnace for treating industrial wastes which employs an economically advantageous direct heating system with use of combustible carbonaceous materials and which nevertheless is capable of effectively preventing scattering of dust and smoothly discharging the molten product without necessitating a complex `:;
:
.
construction.
~ o accomplish this object, the furnace of the present invention is adapted -to supply air or like gas to a high-temperature bed of combus-tible 5 carbonaceous material at an intermediate portion __ _ between itY upper and lower portions to effect combustion while causing the resulting combustion gas to flow through the bed dividedly upward and downward.
When the gas supplied to the intermediate portion of the high-temperature bed for combustion is subsequently passed through the furnace dividedly upward and downward, upward scattering of dust can be minimized with the lower portion of the bed maintained at the desired temperature. Consequently the furnace, although relatively simple in construc-tion, operates satisfactorily in its entirety, substantially without permitting the exhaust gas to cause secondary pollution or clog up the duct with a ` 20 deposit of molten dust. Additionally the molten waste can be drawn off smoothly.
According to an embodiment of the invention, industrial wastes or semi-treated wastes are fed to the upper surface of the high-temperature bed laterally of the furnace so as to be melted by contact with the -4~
;" ' .
.
bed.
When the furnace is thus adapted to melt the waste with the high-temperature bed in contact therewith, dust can be prevented from scattering more effectively despite the : presence of the combustion gas or even if gases are flowing through the interior of the furnace at a high speed to form the bed. This serves to eliminate the pollution and other problems attributable to exhaust emissions. The furnace is simple in construction because the furnace needs only to be so modified that wastes or semi-treated wastes can be fed to the furnace as directed to the bed. The furnace therefore achieves savings in initial, running and maintenance costs in its entirety, is operable with a greatly reduced likelihood of secondary pollution, accident and operational trouble and assures smooth discharge of the molten product.
Other objects and advantages of this invention will become apparent from the following description.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a view in vertical section schematically showing an embodiment of the invention for treating industrial wastes; and . ~
''. ' , . ~ . - . .
.
.'. ` ' Fig. 2 is a view in section taken along the line II-II in Fig. 1.
DESCRIPTION OF THE PREFERRED E~BODIMENT
An embodiment of the invention will be described below with reference to the accompanying ; drawings.
A vertical furnace 1 is provided at its top with a hopper 2 for feeding a suitable amount of coke to the furnace 1 when a gate 4 and a bell 5 are opened by hydraulic cylinders 3a and 3b respèctively. A high-temperature bed 6 is formed `-~ from burning coke in the lower portion of the furnace in its interior. The bed 6 is ignited by a burner ` 7, which is put out after ignition. Preheated air, ` 15 an example of gas for effecting combustion, is supplied from a blower 8 to the furnace 1 through a heat exchange ~ to sustain the combustion of the bed 6.
The preheated air is supplied via lower supply channels lOa to an intermediate portion of the bed 6 between its upper and lower portions, via intermediate supply channels lOb to the upper surface of the bed 6, and via upper supply channels lOc to the space in the upper portion of the furnace. The preheated air maintains the bed 6 at a high temperature sufficient . _ _ to melt wastes and also effects after combustion in the furnace upper portion to completely burn the waste. The resulting combustion gas flows through an exhaust channel 11 into a dust separator 12, from which the gas is led to the heat exchanger 9. The quantities of preheated air fed through the supply channels lOa, lOb, lOc are approximately in the ratio of 3-10:1:1. Thus a major portion of the air is fed to the intermediate portion of the bed 6 by way of the lower supply channels lOa. The intermediate supply channels lOb and the upper supply channels lOc can be omitted when so desired.
Immediately above the bed 6, the furnace 1 has a tapèred inner peripheral wall la extending upwardly outward to reduce the speed of gas flowing upward from the bed and thereby inhibit scattering of dust due to the combustion gas.
`~ 15 ~` Sludge from a sewage treatment process or some other industrial waste, which may be semi-treated to particles, grains or lumps by crushing, drying or burning when desired, is supplied from a hopper 13 through a rotary feeder 14 to the upper surface of the bed 6 by being forced thereagainst with pressurized air from a blower 15 so that the waste will be melted by contact with the high-temperature bed 6, with dust ` 25 4~
prevented from scattering despite the flow o~ combus-tion gas as well as of the air supplied for combus-tion. The waste feeding system is equipped with a shutter 16 operable by a hydraulic cylinder 3c for adjusting the feed, safety o~ening 17, deposition . preventing plate 18, flow regulating valve 19, etc.
so as to feed the waste at a rate suitable for melting.
.
The molten waste is le~ through a discharge ~.
channel provided with barriers 20a and 20b to a gravity separator 21. When the molten waste separates into two layers, the low-gravity melt is run off from a first outlet 22, and the high-gravity melt from a second outlet 23. The gas in the separator 21 is . 15 led through an exhaust gas duct lla to join the exhaust gas from the upper portion of the furnace 1.
Consequently the air fed to the intermediate portion of the bed 6 through the lower supply channels lOa is divided into upward and do~mward flows within the bed 6 and drawn off from the furnace 1 partly through the exhaust channel 11, with the remainder discharged through the duct lla. It has been found that the best result is available when the air is ~ divided upward and downward in an approximately ...... _ .25 ratio of 2-10:1. When the downwardly flowing . ~
`. --8--__ _ _ _ . _ _ . .
.
. _ _ _ _ _ combustion gas is discharged from the furnace 1 through the discharge outlet for the molten waste in this way, or is dis-charged via an outlet close to the outlet, the molten waste is prevented from solidification effectively and can be run 5 off smoothly.
Fig. 1 further shows a water-cooled jacket 24 for protecting the furnace, an air inlet 25 for after combustion, dampers 26 for regulating the flow of exhaust gas, and dampers 27 for adjusting the flow of preheated air.
Various combustible carbonaceous materials, such as waste graphite electrodes, are useful for forming the high-temperature bed 6. The furnace is usable for treating sewage sludges, waste tires, ashes from municipal incinerators waste catalysts and other industrial wastes.
:
Industrial wastes or semi-treated wastes can be fed to the bed 6, for example, by a screw feeder, chute equipped with a slidable gate or some other modified device, in place ~ of the illustrated means.
The present invention relates to a furnace for treating sludges from sewage treatment processes, industrial wastes, or wastes which are crushed, dried, burned or other-wise semi-treated as desired, by melting the waste with a high-temperature furnace bed of combustible carbonaceous substance - to draw off a molten product from the bottom of the bed so that the product can be used, for example, for construction purposes as an aggregate, or for reclamation without entailing the release of heavy metals.
Since low initial cost and reduced running cost are usually essential requirements for furnaces for treating industrial wastes, it is desired that such furnaces be dir-ectly heated with a combustible carbonaceous material, for example~ with coke. To assure combustion for giving a high temperature needed for melting the waste, air or like gas must then be supplied to the combustible material at a high rate. What matters is therefore how to supply the gas for combustion.
With a simple system in which air or like ~'`
~..~....
, '''. . -~: ;
.
~8~
gas is fed to a high-temperature furnace bed of combustible carbonaceous material from below to effect combustion to cause the resulting combustion gas to flow upward, dust of the waste and ash (hereinafter - -5 referred to simply as "dust") are exposed to, and _ _ scattered upward by, a large quantity of combustion gas flowing at a high speed, with the result that the dust will be released from the furnace as entrained in the combustion gas. The exhaust gas is therefore very likely to cause secondary pollution, or clog up, d ~ ge or overheat the exhaust duct due to the deposition of molten dust.
; Conversely with another system in which the gas for combustion is fed to the high-temperature furnace bed from above to cause the resulting combus-tion gas to flow downward, the water contained in the waste will flow down along with the combustion gas, giving a reduced temperature to the lower portion of the bed. Additionally the carbon dioxide and water resulting from the combustion of the waste, or the water initially contained in the waste also flows downward with the combustion gas, undergoing reduction reaction with the carbon component of the combustible carbonaceous material in the lower portion o~ the furnace bed to absorb the ambient heat and eventually .
reducing the temperature of the lower portlon of the bed.
At a reduced temperature, the molten product will block up and will not be run off from the furnace smoothly.
Presumably secondary pollution and other objections due to the exhaust gas could be prevented with use of a secondary combustion chamber or combustion promoting device, or by returning the exhaust gas into the furance, while an additional heater, if provided for the lower portion of the bed, would be useful for keeping this portion at the desired . high temperature. Such means, however, would render the furnace construction complex and result in an increase in the initial cost as well as in the running cost due to damage to the structure, thus failing to fulfill the foregoing requirements.
SUMMARY OF THE INVENTION
The main object of this invention is to provide a furnace for treating industrial wastes which employs an economically advantageous direct heating system with use of combustible carbonaceous materials and which nevertheless is capable of effectively preventing scattering of dust and smoothly discharging the molten product without necessitating a complex `:;
:
.
construction.
~ o accomplish this object, the furnace of the present invention is adapted -to supply air or like gas to a high-temperature bed of combus-tible 5 carbonaceous material at an intermediate portion __ _ between itY upper and lower portions to effect combustion while causing the resulting combustion gas to flow through the bed dividedly upward and downward.
When the gas supplied to the intermediate portion of the high-temperature bed for combustion is subsequently passed through the furnace dividedly upward and downward, upward scattering of dust can be minimized with the lower portion of the bed maintained at the desired temperature. Consequently the furnace, although relatively simple in construc-tion, operates satisfactorily in its entirety, substantially without permitting the exhaust gas to cause secondary pollution or clog up the duct with a ` 20 deposit of molten dust. Additionally the molten waste can be drawn off smoothly.
According to an embodiment of the invention, industrial wastes or semi-treated wastes are fed to the upper surface of the high-temperature bed laterally of the furnace so as to be melted by contact with the -4~
;" ' .
.
bed.
When the furnace is thus adapted to melt the waste with the high-temperature bed in contact therewith, dust can be prevented from scattering more effectively despite the : presence of the combustion gas or even if gases are flowing through the interior of the furnace at a high speed to form the bed. This serves to eliminate the pollution and other problems attributable to exhaust emissions. The furnace is simple in construction because the furnace needs only to be so modified that wastes or semi-treated wastes can be fed to the furnace as directed to the bed. The furnace therefore achieves savings in initial, running and maintenance costs in its entirety, is operable with a greatly reduced likelihood of secondary pollution, accident and operational trouble and assures smooth discharge of the molten product.
Other objects and advantages of this invention will become apparent from the following description.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a view in vertical section schematically showing an embodiment of the invention for treating industrial wastes; and . ~
''. ' , . ~ . - . .
.
.'. ` ' Fig. 2 is a view in section taken along the line II-II in Fig. 1.
DESCRIPTION OF THE PREFERRED E~BODIMENT
An embodiment of the invention will be described below with reference to the accompanying ; drawings.
A vertical furnace 1 is provided at its top with a hopper 2 for feeding a suitable amount of coke to the furnace 1 when a gate 4 and a bell 5 are opened by hydraulic cylinders 3a and 3b respèctively. A high-temperature bed 6 is formed `-~ from burning coke in the lower portion of the furnace in its interior. The bed 6 is ignited by a burner ` 7, which is put out after ignition. Preheated air, ` 15 an example of gas for effecting combustion, is supplied from a blower 8 to the furnace 1 through a heat exchange ~ to sustain the combustion of the bed 6.
The preheated air is supplied via lower supply channels lOa to an intermediate portion of the bed 6 between its upper and lower portions, via intermediate supply channels lOb to the upper surface of the bed 6, and via upper supply channels lOc to the space in the upper portion of the furnace. The preheated air maintains the bed 6 at a high temperature sufficient . _ _ to melt wastes and also effects after combustion in the furnace upper portion to completely burn the waste. The resulting combustion gas flows through an exhaust channel 11 into a dust separator 12, from which the gas is led to the heat exchanger 9. The quantities of preheated air fed through the supply channels lOa, lOb, lOc are approximately in the ratio of 3-10:1:1. Thus a major portion of the air is fed to the intermediate portion of the bed 6 by way of the lower supply channels lOa. The intermediate supply channels lOb and the upper supply channels lOc can be omitted when so desired.
Immediately above the bed 6, the furnace 1 has a tapèred inner peripheral wall la extending upwardly outward to reduce the speed of gas flowing upward from the bed and thereby inhibit scattering of dust due to the combustion gas.
`~ 15 ~` Sludge from a sewage treatment process or some other industrial waste, which may be semi-treated to particles, grains or lumps by crushing, drying or burning when desired, is supplied from a hopper 13 through a rotary feeder 14 to the upper surface of the bed 6 by being forced thereagainst with pressurized air from a blower 15 so that the waste will be melted by contact with the high-temperature bed 6, with dust ` 25 4~
prevented from scattering despite the flow o~ combus-tion gas as well as of the air supplied for combus-tion. The waste feeding system is equipped with a shutter 16 operable by a hydraulic cylinder 3c for adjusting the feed, safety o~ening 17, deposition . preventing plate 18, flow regulating valve 19, etc.
so as to feed the waste at a rate suitable for melting.
.
The molten waste is le~ through a discharge ~.
channel provided with barriers 20a and 20b to a gravity separator 21. When the molten waste separates into two layers, the low-gravity melt is run off from a first outlet 22, and the high-gravity melt from a second outlet 23. The gas in the separator 21 is . 15 led through an exhaust gas duct lla to join the exhaust gas from the upper portion of the furnace 1.
Consequently the air fed to the intermediate portion of the bed 6 through the lower supply channels lOa is divided into upward and do~mward flows within the bed 6 and drawn off from the furnace 1 partly through the exhaust channel 11, with the remainder discharged through the duct lla. It has been found that the best result is available when the air is ~ divided upward and downward in an approximately ...... _ .25 ratio of 2-10:1. When the downwardly flowing . ~
`. --8--__ _ _ _ . _ _ . .
.
. _ _ _ _ _ combustion gas is discharged from the furnace 1 through the discharge outlet for the molten waste in this way, or is dis-charged via an outlet close to the outlet, the molten waste is prevented from solidification effectively and can be run 5 off smoothly.
Fig. 1 further shows a water-cooled jacket 24 for protecting the furnace, an air inlet 25 for after combustion, dampers 26 for regulating the flow of exhaust gas, and dampers 27 for adjusting the flow of preheated air.
Various combustible carbonaceous materials, such as waste graphite electrodes, are useful for forming the high-temperature bed 6. The furnace is usable for treating sewage sludges, waste tires, ashes from municipal incinerators waste catalysts and other industrial wastes.
:
Industrial wastes or semi-treated wastes can be fed to the bed 6, for example, by a screw feeder, chute equipped with a slidable gate or some other modified device, in place ~ of the illustrated means.
Claims (8)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A furnace for treating industrial wastes by melting said industrial waste or a semi-treated product thereof com-prising a high-temperature bed including an upper portion and a lower portion formed from a combustible carbonaceous material which permits a molten product to be drawn off from said lower portion of said bed, means for supplying a gas for combustion to said high-temperature bed at an intermediate portion be-tween said upper and lower portions of said high-temperature bed while causing said combustion gas to flow through said high-temperature bed dividedly upward and downward.
2. A furnace for treating industrial wastes by melting said industrial waste or a semi-treated product thereof com-prising a high-temperature bed including an upper portion and a lower portion formed from a combustible carbonaceous material which permits a molten product to be drawn off from said lower portion of said bed, means for supplying a gas for combustion to said high-temperature bed at an intermediate portion be-tween said upper and lower portions of said high-temperature bed and means for discharging said combustion gas at an upper and a lower portion of said furnace whereby said combustion gas is caused to flow through said high-temperature bed div-idedly upward and downward, said means for discharging said combustion gas at the lower portion of said furnace acting also as a discharge outlet for draining off molten products from said furnace.
3. A furnace as defined in claim 2, which comprises means for feeding said industrial waste or the semi-treated product thereof into said furnace just above the upper surface of said upper portion of said high-temperature bed laterally thereof so as to be melted by contact with said high-tempera-ture bed.
4. A furnace as defined in claim 1, 2 or 3, characterized in that immediately above said high-temperature bed, said furnace comprises a tapered inner peripheral wall extending upwardly and outward.
5. A furnace as claimed in claim 1, 2 or 3, which includes means for supplying a combustion gas laterally immediately above said upper bed portion.
6. A furnace as claimed in claim 1, 2 or 3, which includes means for supplying a combustion gas into said furnace in an area well above said upper bed portion.
7. A furnace as claimed in claim 1, 2 or 3, which includes second and third means for supplying a combustion gas laterally into said furnace, said second means supplying said combustion gas immediately above said upper high-temperature bed portion and said third means supplying said combustion gas above said second means for supplying combustion gas into said furnace.
8. A furnace as claimed in claim 1, 2 or 3, which includes an air inlet for admitting air that aids in after combustion of the combustible products.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000348286A CA1148411A (en) | 1980-03-24 | 1980-03-24 | Furnace for treating industrial wastes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000348286A CA1148411A (en) | 1980-03-24 | 1980-03-24 | Furnace for treating industrial wastes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1148411A true CA1148411A (en) | 1983-06-21 |
Family
ID=4116549
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000348286A Expired CA1148411A (en) | 1980-03-24 | 1980-03-24 | Furnace for treating industrial wastes |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1148411A (en) |
-
1980
- 1980-03-24 CA CA000348286A patent/CA1148411A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |