CN104329935B - A kind of modified blast furnace - Google Patents
A kind of modified blast furnace Download PDFInfo
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- CN104329935B CN104329935B CN201410581933.4A CN201410581933A CN104329935B CN 104329935 B CN104329935 B CN 104329935B CN 201410581933 A CN201410581933 A CN 201410581933A CN 104329935 B CN104329935 B CN 104329935B
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- water jacket
- door
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- pipe
- blast furnace
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 300
- 239000011449 brick Substances 0.000 claims abstract description 26
- 244000144985 peep Species 0.000 claims description 6
- 239000007788 liquid Substances 0.000 description 15
- 239000003245 coal Substances 0.000 description 12
- 239000002994 raw material Substances 0.000 description 12
- 238000001816 cooling Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 239000002912 waste gas Substances 0.000 description 8
- 239000007789 gas Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 239000000428 dust Substances 0.000 description 5
- 239000002893 slag Substances 0.000 description 5
- 239000000446 fuel Substances 0.000 description 4
- 238000003723 Smelting Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003203 everyday effect Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
Landscapes
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
A kind of modified blast furnace, base is built up by heat resisting brick, row lead bullion hole is had in base, left and right sidewall is respectively made up of one group of upper water sleeve and one group of lower water jacket, adjacent upper water sleeve is communicated with by water jacket communicating pipe with between lower water jacket, each lower water jacket has two air inlet inclined tubes to pass, and every root air inlet inclined tube to be responsible for air inlet through an air intake branch and to be communicated with.Front and back walls is respectively by two pieces of upper water sleeve doors, water jacket door and one piece of lower water jacket door are formed in two pieces, every block upper water sleeve door there is upper water sleeve door outlet pipe, in every block, water jacket door there is middle water jacket door water inlet pipe, be communicated with by water jacket door communicating pipe between adjacent upper water sleeve Men Yuzhong water jacket door, every block lower water jacket door has lower water jacket door outlet pipe, scum pipe, lower water jacket door water inlet pipe; The top of blast furnace is water jacket frame, and water jacket frame has water jacket frame outlet pipe, water jacket frame water inlet pipe, getter cover is connected with water jacket frame through connecting plate, and getter cover upper end is blast pipe.
Description
Technical field
The present invention relates to a kind of modified blast furnace.
Background technology
At present, the blast furnace that known smelting enterprise uses, one is do not have to use the tipping tube angled with horizontal line to supply gas, occur that in blast furnace, air permeability is poor, oxygen coverage rate is narrow, causes blast furnace unit bottom surface day of year process material quantity few (process every day every square metre raw material 25-30 tons), and dust rate high (dust rate 12%-18%) in waste gas, the useful metal rate of recovery is low, and blast furnace production efficiency is low.Two is do not have two ends to arrange liquid slag, after blast furnace work a period of time, easily " dead stove ", needs stop production to overhaul, causes blast furnace production cost to rise.
Summary of the invention
In order to overcome existing smelting enterprise use blast furnace produce time, the deficiency of dust rate high and easy " dead stove " in few, the waste gas of blast furnace unit bottom surface day of year process material quantity occurred, the invention provides a kind of modified blast furnace, use this kind of modified blast furnace, Neng Shi blast furnace unit bottom surface day of year process material quantity reaches process every day every square metre raw material 35-40 tons; In waste gas, dust rate drops to 5%-6%; Meanwhile, blast furnace stream time is long, 1 year internal cause " dead stove " need stop production to overhaul number of times to reduce to 1-3 times 4-6 times.
In order to achieve the above object, the technical solution adopted for the present invention to solve the technical problems is following design:
The base of blast furnace is built up by heat resisting brick, has row lead bullion hole in base, and row's lead bullion groove is equipped with in the exit in row lead bullion hole.
The left and right sidewall of blast furnace is respectively made up of one group of upper water sleeve and one group of lower water jacket, adjacent upper water sleeve is communicated with by water jacket communicating pipe with between lower water jacket, each upper water sleeve is communicated with water jacket water outlet main pipe through a water jacket exit branch, and each lower water jacket is intake to be responsible for through a water jacket water inlet pipe and water jacket and is communicated with; Each lower water jacket has two air inlet inclined tubes to pass, and the upper end of every root air inlet inclined tube has peep hole, and the peep hole of air inlet inclined tube upper end is closed by keeping off orifice plate, and every root air inlet inclined tube to be responsible for air inlet through an air intake branch and to be communicated with.
The front and back walls of blast furnace is respectively by two pieces of upper water sleeve doors, water jacket door and one piece of lower water jacket door are formed in two pieces, upper water sleeve door is connected with upper water sleeve through jockey, middle water jacket door is connected with lower water jacket through jockey, every block upper water sleeve door there is upper water sleeve door outlet pipe, in every block, water jacket door there is middle water jacket door water inlet pipe, be communicated with by water jacket door communicating pipe between adjacent upper water sleeve Men Yuzhong water jacket door, every block lower water jacket door has lower water jacket door outlet pipe, scum pipe, lower water jacket door water inlet pipe.
The top of blast furnace is water jacket frame, and water jacket frame has water jacket frame outlet pipe, water jacket frame water inlet pipe, getter cover is connected with water jacket frame through connecting plate, and getter cover upper end is blast pipe.
Before using, with tracheae, air inlet supervisor is communicated with air blast, blast pipe is communicated with air exhauster, exhaust-gas treatment room; With water pipe, water jacket water inlet supervisor, lower water jacket door water inlet pipe, middle water jacket door water inlet pipe, water jacket frame water inlet pipe are communicated with water tower outlet pipe, water jacket frame outlet pipe, lower water jacket door outlet pipe, water jacket water outlet main pipe, upper water sleeve door outlet pipe are communicated with pond water inlet pipe, then with stopper, two scum pipes and a row lead bullion hole are closed.
During work, first igniter fuel is put into the groove of base from cavity between getter cover and water jacket frame, light igniter fuel, open air exhauster, air blast, then raw material brick and coal charge brick are arranged in pairs or groups from cavity between getter cover and water jacket frame and put into blast furnace, stack when aspect ratio is connected plate hight to raw material brick and coal charge brick and stop.Subsequently, water tower outlet pipe valve is opened.Now, bottom coal charge brick in blast furnace constantly burns, burning required air is responsible for through air inlet by air blast, air intake branch, air inlet inclined tube is sent into, coal charge brick constantly burns, bottom in blast furnace is made to form high temperature, in blast furnace, the raw material brick of bottom dissolves into liquid state, liquid lead sinks to bottom, liquid slag floats over top, certain interval of time opens gear orifice plate, observe the situation in blast furnace, when liquid face is higher than scum pipe, then remove the stopper on two scum pipes and a row lead bullion hole, liquid slag is collected through two scum pipes, through row lead bullion hole, row's lead bullion groove collects liquid lead bullion.When liquid face is lower than scum pipe, then with stopper, two scum pipes and a row lead bullion hole are closed.
In work, when raw material brick and coal charge brick stack aspect ratio connecting plate low time, then supplement raw material brick and coal charge brick in time.
In the whole course of work, under the effect of air exhauster, waste gas can not overflow from cavity between getter cover and water jacket frame, but has a small amount of air to flow to, and enters exhaust-gas treatment room together with waste gas through getter cover, blast pipe.
In the whole course of work, upper water sleeve and lower water jacket, to be intake supervisor, water jacket water inlet pipe, lower water jacket, water jacket communicating pipe, upper water sleeve, water jacket exit branch, water jacket water outlet main pipe, pond water inlet pipe and cooling through water tower outlet pipe, water jacket by the current of water tower; Upper water sleeve Men Yuzhong water jacket door, by the current of water tower through water tower outlet pipe, middle water jacket door water inlet pipe, middle water jacket door, water jacket door communicating pipe, upper water sleeve door, upper water sleeve door outlet pipe, pond water inlet pipe and cooling; Lower water jacket door, by the current of water tower through water tower outlet pipe, lower water jacket door water inlet pipe, lower water jacket door, lower water jacket door outlet pipe, pond water inlet pipe and cooling; Water jacket frame, by the current of water tower through water tower outlet pipe, water jacket frame water inlet pipe, water jacket frame, water jacket frame outlet pipe, pond water inlet pipe and cooling.
When stop production to overhaul, close air exhauster, air blast, water tower outlet pipe valve, removal water jacket door communicating pipe, open upper water sleeve Men Yuzhong water jacket door, remove lower water jacket door.
In test, air inlet inclined tube and horizontal angle have a significant impact furnace bottom unit plane day of year process material quantity, through test of many times, air inlet inclined tube and horizontal angle be 16 ~ 20 degree comparatively suitable, air inlet inclined tube and horizontal angle be 19 degree for best.
Of the present inventionly also comprise following preferred version.
In preferred scheme, air inlet inclined tube and horizontal angle are 16 ~ 20 degree, most preferably: air inlet inclined tube and horizontal angle are 19 degree.
The invention has the beneficial effects as follows: 1, to use and the angled tipping tube of horizontal line is supplied gas, blast furnace unit bottom surface day of year process material quantity is high.2, in waste gas, dust rate is low, and the useful metal rate of recovery is high.3, blast furnace stream time is long, and maintenance number of times is few, and the cost of overhaul is low.4, structure cylinder list, easy to use.
Accompanying drawing explanation
Below in conjunction with drawings and embodiments, the present invention is further described.
Fig. 1 is a kind of organigram of modified blast furnace.
Fig. 2 is the top view of Fig. 1.
Fig. 3 is the A of Fig. 2---A view.
In figure
1, connecting plate 2, water jacket frame outlet pipe 3, upper water sleeve 4, jockey
5, water jacket communicating pipe 6, lower water jacket 7, lower water jacket door outlet pipe 8, water jacket water inlet pipe
9, water jacket water inlet supervisor 10, row's lead bullion groove 11, base 12, scum pipe
13, lower water jacket door 14, lower water jacket door water inlet pipe 15, middle water jacket door water inlet pipe
16, air inlet inclined tube 17, gear orifice plate 18, air intake branch 19, air inlet supervisor
20, middle water jacket door 21, upper water sleeve door 22, water jacket water outlet main pipe 23, water jacket exit branch
24, upper water sleeve door outlet pipe 25, water jacket frame water inlet pipe 26, water jacket frame
27, water jacket door communicating pipe 28, getter cover 29, blast pipe 30, row lead bullion hole.
Detailed description of the invention
In the embodiment shown in Fig. 1, Fig. 2, Fig. 3, the base 11 of blast furnace is built up by heat resisting brick, has row lead bullion hole 30 in base 11, and row's lead bullion groove 10 is equipped with in the exit in row lead bullion hole 30.
The left and right sidewall of blast furnace is respectively made up of one group of upper water sleeve 3 and one group of lower water jacket 6, adjacent upper water sleeve 3 is communicated with by water jacket communicating pipe 5 with between lower water jacket 6, each upper water sleeve 3 is communicated with water jacket water outlet main pipe 22 through a water jacket exit branch 23, and each lower water jacket 6 is communicated with through a water jacket water inlet pipe 8 and water jacket supervisor 9 of intaking; Each lower water jacket 6 has two air inlet inclined tubes 16 to pass, and the upper end of every root air inlet inclined tube 16 has peep hole, and the peep hole of air inlet inclined tube 16 upper end is closed by keeping off orifice plate 17, and every root air inlet inclined tube 16 is responsible for 19 through an air intake branch 18 and air inlet and is communicated with.
The front and back walls of blast furnace is respectively made up of water jacket door 20 and one piece of lower water jacket door 13 in 21, two pieces, two pieces of upper water sleeve doors, upper water sleeve door 21 is connected with upper water sleeve 3 through jockey 4, middle water jacket door 20 is connected with lower water jacket 6 through jockey 4, every block upper water sleeve door 21 there is upper water sleeve door outlet pipe 24, in every block, water jacket door 20 there is middle water jacket door water inlet pipe 15, be communicated with by water jacket door communicating pipe 27 between adjacent upper water sleeve door 21 with middle water jacket door 20, every block lower water jacket door 13 has lower water jacket door outlet pipe 7, scum pipe 12, lower water jacket door water inlet pipe 14.
The top of blast furnace is water jacket frame 26, and water jacket frame 26 has water jacket frame outlet pipe 2, water jacket frame water inlet pipe 25, getter cover 28 is connected with water jacket frame 26 through connecting plate 1, and getter cover 28 upper end is blast pipe 29.
Before using, with tracheae, air inlet supervisor 19 is communicated with air blast, blast pipe 29 is communicated with air exhauster, exhaust-gas treatment room; With water pipe, water jacket water inlet supervisor 9, lower water jacket door water inlet pipe 14, middle water jacket door water inlet pipe 15, water jacket frame water inlet pipe 25 are communicated with water tower outlet pipe, water jacket frame outlet pipe 2, lower water jacket door outlet pipe 7, water jacket water outlet main pipe 22, upper water sleeve door outlet pipe 24 are communicated with pond water inlet pipe, then with stopper, two scum pipes 12 and a row lead bullion hole 30 are closed.
During work, first igniter fuel is put into the groove of base 11 from cavity between getter cover 28 and water jacket frame 26, light igniter fuel, open air exhauster, air blast, then raw material brick and coal charge brick are arranged in pairs or groups from cavity between getter cover 28 and water jacket frame 26 and put into blast furnace, to raw material brick and coal charge brick stack aspect ratio connecting plate 1 high time only.Subsequently, water tower outlet pipe valve is opened.Now, bottom coal charge brick in blast furnace constantly burns, burning required air is responsible for 19 by air blast through air inlet, air intake branch 18, air inlet inclined tube 16 is sent into, coal charge brick constantly burns, bottom in blast furnace is made to form high temperature, in blast furnace, the raw material brick of bottom dissolves into liquid state, liquid lead sinks to bottom, liquid slag floats over top, certain interval of time opens gear orifice plate 17, observe the situation in blast furnace, when liquid face is higher than scum pipe 12, then remove the stopper on two scum pipes 12 and a row lead bullion hole 30, liquid slag is collected through two scum pipes 12, through row lead bullion hole 30, row's lead bullion groove 10 collects liquid lead bullion.When liquid face is lower than scum pipe 12, then with stopper, two scum pipes 12 and a row lead bullion hole 30 are closed.
In work, when raw material brick and coal charge brick stack aspect ratio connecting plate 1 low time, then supplement raw material brick and coal charge brick in time.
In the whole course of work, under the effect of air exhauster, waste gas can not overflow from cavity between getter cover 28 and water jacket frame 26, but has a small amount of air to flow to, and enters exhaust-gas treatment room together with waste gas through getter cover 28, blast pipe 29.
In the whole course of work, upper water sleeve 3 and lower water jacket 6, to be intake supervisor 9, water jacket water inlet pipe 8, lower water jacket 6, water jacket communicating pipe 5, upper water sleeve 3, water jacket exit branch 23, water jacket water outlet main pipe 22, pond water inlet pipe and cooling through water tower outlet pipe, water jacket by the current of water tower; Upper water sleeve door 21 and middle water jacket door 20, by the current of water tower through water tower outlet pipe, middle water jacket door water inlet pipe 15, middle water jacket door 20, water jacket door communicating pipe 27, upper water sleeve door 21, upper water sleeve door outlet pipe 24, pond water inlet pipe and cooling; Lower water jacket door 13, by the current of water tower through water tower outlet pipe, lower water jacket door water inlet pipe 14, lower water jacket door 13, lower water jacket door outlet pipe 7, pond water inlet pipe and cooling; Water jacket frame 26, by the current of water tower through water tower outlet pipe, water jacket frame water inlet pipe 25, water jacket frame 26, water jacket frame outlet pipe 2, pond water inlet pipe and cooling.
When stop production to overhaul, close air exhauster, air blast, water tower outlet pipe valve, removal water jacket door communicating pipe 27, open upper water sleeve door 21 and middle water jacket door 20, remove lower water jacket door 13.
In test, air inlet inclined tube 16 and horizontal angle have a significant impact furnace bottom unit plane day of year process material quantity, through test of many times, air inlet inclined tube 16 and horizontal angle be 16 ~ 20 degree comparatively suitable, air inlet inclined tube 16 and horizontal angle are 19 degree is the best.
Of the present inventionly also comprise following preferred version.
In preferred scheme, air inlet inclined tube 16 and horizontal angle are 16 ~ 20 degree, most preferably: air inlet inclined tube 16 and horizontal angle are 19 degree.
Claims (8)
1. a modified blast furnace,
it is characterized in that: the base (11) of blast furnace is built up by heat resisting brick, row lead bullion hole (30) is had in base (11), the left and right sidewall of blast furnace is respectively made up of one group of upper water sleeve (3) and one group of lower water jacket (6), adjacent upper water sleeve (3) is communicated with by water jacket communicating pipe (5) with between lower water jacket (6), each lower water jacket (6) has two air inlet inclined tubes (16) to pass, and every root air inlet inclined tube (16) is responsible for (19) through an air intake branch (18) with air inlet and is communicated with; The front and back walls of blast furnace is respectively by two pieces of upper water sleeve doors (21), water jacket door (20) and one piece of lower water jacket door (13) are formed in two pieces, every block upper water sleeve door (21) there is upper water sleeve door outlet pipe (24), water jacket door (20) there is middle water jacket door water inlet pipe (15) in every block, be communicated with by water jacket door communicating pipe (27) between adjacent upper water sleeve door (21) with middle water jacket door (20), every block lower water jacket door (13) has lower water jacket door outlet pipe (7), scum pipe (12), lower water jacket door water inlet pipe (14); The top of blast furnace is water jacket frame (26), and water jacket frame (26) has water jacket frame outlet pipe (2), water jacket frame water inlet pipe (25), getter cover (28) is connected with water jacket frame (26) through connecting plate (1), and getter cover (28) upper end is blast pipe (29).
2. a kind of modified blast furnace according to claim 1,
it is characterized in that: row's lead bullion groove (10) is equipped with in the exit of row lead bullion hole (30).
3. a kind of modified blast furnace according to claim 1,
it is characterized in that: each upper water sleeve (3) is communicated with water jacket water outlet main pipe (22) through a water jacket exit branch (23), and each lower water jacket (6) is intake through a water jacket water inlet pipe (8) and water jacket and is responsible for (9) and is communicated with.
4. a kind of modified blast furnace according to claim 1,
it is characterized in that: the upper end of every root air inlet inclined tube (16) has peep hole, and the peep hole of air inlet inclined tube (16) upper end is closed by keeping off orifice plate (17).
5. a kind of modified blast furnace according to claim 1,
it is characterized in that: every root air inlet inclined tube (16) is responsible for (19) through an air intake branch (18) with air inlet and is communicated with.
6. a kind of modified blast furnace according to claim 1,
it is characterized in that: upper water sleeve door (21) is connected with upper water sleeve (3) through jockey (4), and middle water jacket door (20) is connected with lower water jacket (6) through jockey (4).
7. a kind of modified blast furnace according to claim 1,
it is characterized in that: air inlet inclined tube (16) and horizontal angle are 16 degree to 20 degree.
8. a kind of modified blast furnace according to claim 7,
it is characterized in that: air inlet inclined tube (16) and horizontal angle are 19 degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410581933.4A CN104329935B (en) | 2014-10-28 | 2014-10-28 | A kind of modified blast furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410581933.4A CN104329935B (en) | 2014-10-28 | 2014-10-28 | A kind of modified blast furnace |
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| Publication Number | Publication Date |
|---|---|
| CN104329935A CN104329935A (en) | 2015-02-04 |
| CN104329935B true CN104329935B (en) | 2015-11-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410581933.4A Expired - Fee Related CN104329935B (en) | 2014-10-28 | 2014-10-28 | A kind of modified blast furnace |
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| Country | Link |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105890393A (en) * | 2016-06-21 | 2016-08-24 | 永兴县金业冶炼有限责任公司 | Waste gas collecting device for smelting furnace |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104792168B (en) * | 2015-04-21 | 2017-03-22 | 永兴县东宸有色金属再生利用有限公司 | Environment-friendly blasting smelting furnace |
| CN104864706B (en) * | 2015-05-28 | 2016-08-31 | 永兴县鸿福金属有限公司 | The lower water jacket of modified blasting smelting stove |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02101380A (en) * | 1988-10-05 | 1990-04-13 | Kubota Ltd | Cupola |
| CN1052334A (en) * | 1989-12-08 | 1991-06-19 | 田士杰 | The hot air smelting method of lead blast furnace and wind jacket in furnace thereof |
| CN101358809A (en) * | 2008-07-16 | 2009-02-04 | 朝阳昊天有色金属有限公司 | Blast furnace |
| CN201876095U (en) * | 2010-10-23 | 2011-06-22 | 郴州市国大有色金属冶炼有限公司 | One-step lead-smelting blast furnace |
| WO2011149439A1 (en) * | 2010-05-25 | 2011-12-01 | Lakomsky Victor Josypovych | Method and electrocalcinator for the calcination of loose carbon material |
| CN202170356U (en) * | 2011-08-01 | 2012-03-21 | 湖南东港锑品有限公司 | Furnace bosh water tank blast nozzle of front-bed-free blast furnace |
| CN203464677U (en) * | 2013-08-13 | 2014-03-05 | 王成旭 | Energy-saving sealed blast furnace |
| CN204177181U (en) * | 2014-10-28 | 2015-02-25 | 永兴县荣鹏金属有限公司 | A kind of modified Novel blast furnace |
-
2014
- 2014-10-28 CN CN201410581933.4A patent/CN104329935B/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02101380A (en) * | 1988-10-05 | 1990-04-13 | Kubota Ltd | Cupola |
| CN1052334A (en) * | 1989-12-08 | 1991-06-19 | 田士杰 | The hot air smelting method of lead blast furnace and wind jacket in furnace thereof |
| CN101358809A (en) * | 2008-07-16 | 2009-02-04 | 朝阳昊天有色金属有限公司 | Blast furnace |
| WO2011149439A1 (en) * | 2010-05-25 | 2011-12-01 | Lakomsky Victor Josypovych | Method and electrocalcinator for the calcination of loose carbon material |
| CN201876095U (en) * | 2010-10-23 | 2011-06-22 | 郴州市国大有色金属冶炼有限公司 | One-step lead-smelting blast furnace |
| CN202170356U (en) * | 2011-08-01 | 2012-03-21 | 湖南东港锑品有限公司 | Furnace bosh water tank blast nozzle of front-bed-free blast furnace |
| CN203464677U (en) * | 2013-08-13 | 2014-03-05 | 王成旭 | Energy-saving sealed blast furnace |
| CN204177181U (en) * | 2014-10-28 | 2015-02-25 | 永兴县荣鹏金属有限公司 | A kind of modified Novel blast furnace |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105890393A (en) * | 2016-06-21 | 2016-08-24 | 永兴县金业冶炼有限责任公司 | Waste gas collecting device for smelting furnace |
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| CN104329935A (en) | 2015-02-04 |
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