CN105177292B - A kind of method of utilization high-temperature oxydation pelletizing sensible heat direct-reduction production metallized pellet - Google Patents
A kind of method of utilization high-temperature oxydation pelletizing sensible heat direct-reduction production metallized pellet Download PDFInfo
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- CN105177292B CN105177292B CN201510527945.3A CN201510527945A CN105177292B CN 105177292 B CN105177292 B CN 105177292B CN 201510527945 A CN201510527945 A CN 201510527945A CN 105177292 B CN105177292 B CN 105177292B
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Abstract
The invention belongs to the method that the sensible heat direct-reduction of metallurgical technology field, more particularly to a kind of utilization high-temperature oxydation pelletizing produces metallized pellet.The present invention is obtained high-temperature oxydation pelletizing using wall scroll drying grate kiln process, directly reduction reaction is carried out using its sensible heat with reducing agent (coal), heat exchange is carried out using normal temperature reduction coal again and is cooled down, after magnetic separation is separated, metallized pellet product and the reducing agent (including destructive distillation coal tar) dried are obtained.The present invention can reclaim destructive distillation coal tar be circulated using and high PG recycled, the destructive distillation coal tar of recovery is reusable in reducing agent, the rotary kiln that high PG is capable of oxidizing applied to pelletizing rotary kiln and flame-insulating type drastic reduction provides the energy, without in addition with addition of the energy of heating.This patent can reduce by 40%~60% coal consumption, and the high-purity coal gas of burning can reduce carbon emission, energy-conserving and environment-protective.
Description
Technical field
Gold is produced the invention belongs to metallurgical technology field, more particularly to a kind of direct-reduction using high-temperature oxydation pelletizing sensible heat
The method for belonging to pellet.
Background technology
China is a big steel country, and output of steel breaks through 11.26 hundred million tons (wherein crude steel is 8.2 hundred million tons), Nian Sheng within 2014
Produce grate kiln method, sintering-machine method acid pellet yield and reach more than 20 hundred million tons；Steel scrap amount (containing DRI) has 29,000,000 every year
The breach of ton, rather than burnt ironmaking (DRI) product yield but accounts for world wide production less than 1.0%, every year only less than 600,000
The production scale of ton.As China's coking coal reserves are increasingly poor and environmental issue is increasingly serious, country has put into effect more correlation
The policy such as industrial policy and energy-saving and emission-reduction carbon drop, and the straight carbon steel size of capacity is controlled, electric steel ratio is lifted, encourage exploitation, answer
With the non-burnt iron-smelting process technology and equipment such as DRI and melting and reducing iron, and the technology such as mini-mill steelmaking of making greater efforts to promote is opened
Hair and application.
China's iron ore deposit belongs to the abundant country of low poor refractory iron ore, and low poor refractory iron ore accounts for more than 97%, directly also
Product grade is very low after original, it is impossible to which application is, it is necessary to the reduction smelting of coal base slag sluicing system selects the method product could to apply；In addition, coking coal is provided
Source is increasingly poor, and mill coal rich coal resources, therefore according to China's actual conditions, only greatly develop coal base reduction ironworker
Skill technology and equipment, more conforms to the national conditions of China's DRI.
The ripe technology of China's coal based ferrum redactum industrialization and equipment mainly have：Coal base tunnel cave pot type method, coal base
Tank-less tunnel furnace method and caol based DR process.
Wherein, traditional coal base tunnel cave pot type method produces DRI (sponge iron), it is necessary to using expensive fire resisting
Tank (ton reduced iron consumption fire-resistant can is general at 230~280 yuan/ton), the annual capacity maximum of wall scroll production line is less than 30,000 tons, work
Skill equipment falls behind, production capacity is low, floor space is wide, high energy consumption, recovery time are long, production run high cost, labour intensity greatly, product
Poor quality etc., causes the practical problems such as production run high cost, slack market.
Although coal base tank-less tunnel furnace method can abandon the expensive carborundum tank of tunnel furnace method, the recovery time is greatly shortened,
Reduce energy consumption and production costs, it is also possible to by various high-grade ores, various low poor refractory iron ores, grandidierite and iron-containing waste, also
Original post processing obtains TFe >=90% metallic iron, or even granulated iron product, difficult ore dressing resource is obtained sustainable development, but it is produced
Line floor space is still very big, and production line operation is still cumbersome, and its recovery time still needs 7h~9h, scale of investment also compared with
Greatly, reducing process is numerous and diverse, therefore, this tank-less reduction kiln is required further improvement and optimized.
Gradually ripe, operating cost is relatively low for the step kiln process technology of coal base one, gradually promotes, but to reduction coal
There are strict requirements, it is necessary to make reducing agent using graininess high-quality jet coal, lignite, operating difficulties, scale of investment is relatively
Larger, the annual capacity of wall scroll production line is also less than 200,000 tons；The step kiln process technology of coal base two is gradually ripe, but rich block
Iron ore quantity lacks, and using high-grade acid pellet, production run is relatively costly, is not suitable for China's national situation.
The content of the invention
The deficiency that the present invention exists for above-mentioned prior art, there is provided one kind is using the direct-reduction of high-temperature oxydation pelletizing sensible heat
The method for producing metallized pellet, by grate kiln legal system obtains high-temperature oxydation pelletizing, using its 1200-1250 DEG C
Sensible heat produces metallized pellet with reduction coal drastic reduction.
The technical scheme that the present invention solves above-mentioned technical problem is as follows：One kind is using the direct-reduction of high-temperature oxydation pelletizing sensible heat
The method for producing metallized pellet, step is as follows：
(1) mesh of fineness -200 is accounted for into more than 80%, grade TFe >=67.0% Iron Ore Powder, with addition of Iron Ore Powder weight 0~8%
Anthracite, 2.0% binding agent, mixed, moistened mill, pelletizing, pelletizing granularity is ￠ 8~￠ 16mm, at 105~280 DEG C
At a temperature of dry 4~6h, be warmed up to 1200~1250 DEG C in acid pellet rotary kiln, continue to sinter 15~20min, obtain
1200~1250 DEG C of high-temperature oxydation pelletizing；
(2) take the high-temperature oxydation pelletizing of step (1), according to high-temperature oxydation pelletizing weight with addition of 40~50%, granularity 0~
The anthracite of 20mm, after mixing at a temperature of 800~1050 DEG C, adds flame-insulating type drastic reduction rotary kiln, 1060~1080
Drastic reduction is carried out under the conditions of DEG C and reacts 2.5~3.2h, take out pelletizing, cover cold with addition of coal dust by the 30~50% of pelletizing weight
But, after cooling 4h, coal tar and metallized pellet are separated to obtain by magnetic separation, magnetic separation strength is 3200Gs, gained metallized pellet
Index is TFe >=90.0%, MFe >=84.0%, η Fe >=93.0%, and reclaims 20~22% destructive distillation coal tar.
Wherein, described binding agent is sodium humate, dextrin, syrup, spent pulping liquor, malt sugar or water-soluble poval etc.
Organic binder bond.
The anthracitic composition fraction by weight is calculated as：Fixed carbon >=65%, ash≤20%, fugitive constituent >=12%, S
≤ 1.0%.
The composition fraction by weight of coal dust described in step (2) be calculated as fixed carbon >=65%, ash≤10%, fugitive constituent≤
20%th, S≤0.5%.
Destructive distillation coal tar obtained by step (2) can be recycled as the reduction coal for mixing with high-temperature oxydation pelletizing preheating.
Flame-insulating type drastic reduction rotary kiln described in step (2) is entire body disclosed in Patent No. 201520108511.5
External heat flame-insulating type rotary kiln or porous type rotary kiln.
Wherein, described porous type rotary kiln includes cylinder, and the cylinder includes middle part conversion zone, in middle part reaction
Section is outer to be interval with multiple tracks air intake endless tube, and air intake endless tube is connected by air supply line with wind regime described in multiple tracks；The air intake endless tube
On be radially evenly equipped with branch's airduct；
The cylinder includes metal cylinder body wall and the flame retardant coating being embedded on the inside of the metal cylinder body wall, the flame retardant coating bag
The refractory brick mutually overlapped by female mouth and rim of the mouth is included, the refractory brick includes circulation backup lining brick, air intake backup lining brick and Sealing furnace
Lining brick；Cross blowhole is provided with inside the circulation backup lining brick, the air intake backup lining brick is from outer to inner sequentially provided with interconnected
Radial direction intake stack and cross blowhole, are provided with and radial direction intake stack between the air intake backup lining brick and the metal cylinder body wall
The fresh air inlet of connection；Described cross blowhole is formed by circumferential ventilating hole channel and axial ventilation duct, and multiple circumferences are led to
Air holes road forms annular passage, and the radial air openings in brick ridge interval are communicated with the inside of the annular passage；The Sealing furnace
Lining brick is solid brick body, and the sealing backup lining brick is provided with polylith, is disposed in the annular passage；Branch's airduct leads to
Fresh air inlet and air intake backup lining brick and rotary kiln chamber are crossed, branch's airduct is provided with branch's airduct valve.
Further, main valve is provided between the air intake endless tube and the wind regime, the air supply line is provided with air feed pipe
Road valve.
Further, the circulation backup lining brick, air intake backup lining brick and sealing backup lining brick are solid by refractory brick support and embedded iron
Surely it is embedded in the metal cylinder body wall inner side.
Further, the cross blowhole is fixed in annular passage by cross blowhole support.
Further, it is provided with alumina silicate fibre hardboard between the circulation backup lining brick and the metal cylinder body wall.
Compared with prior art, the beneficial effects of the present invention are：
1st, the present invention is obtained high-temperature oxydation pelletizing using wall scroll drying grate-kiln process, using its 1200-1250 DEG C shows
Heat directly carries out reduction reaction with hot reducing agent (coal), after 2.5-3.2h is reduced, then is carried out using normal temperature reduction coal
Heat exchange is simultaneously cooled down, and after magnetic separation is separated, obtains metallized pellet.The present invention can circulation and stress destructive distillation coal tar and high PG,
Recycled, the destructive distillation coal tar of recovery is reusable in reducing agent, and high PG being capable of oxidizing applied to pelletizing rotary kiln and flame-insulating type
The rotary kiln of drastic reduction provides the energy, without in addition with addition of the energy of heating.This patent can reduce by 40%~60%
Coal consumption, and the high-purity coal gas of burning can reduce carbon emission, energy-conserving and environment-protective.
2nd, flame-insulating type drastic reduction rotary kiln temperature of the invention control is at 1060-1080 DEG C, makes the reaction mass will not
Melting or semi-molten state is presented, rotary kiln does not have ring formation phenomenon, simultaneously because the reducing atmosphere in rotary kiln is extremely strong, reduction
Temperature stabilization, the recovery time only needs 2.5h~3.2h, it is ensured that reaction mass equally reaches preferably reduction in low-temperature short-time
Effect.
3rd, can be with the converter chain such as electric arc furnaces, converter by hot obtained in the present invention or cold conditions metallized pellet
Connect, whole flow process is mini-mill steelmaking method, be only the 20% of blast furnace-converter flow steel-making carbon emission long, not only realize
Non- burnt ironmaking and mini-mill steelmaking, are also greatly reduced the total carbon emission of steel-making.
Brief description of the drawings
Fig. 1 is the longitudinal profile schematic diagram of porous type rotary kiln in the present invention；
Fig. 2 is the A-A directions sectional schematic diagram of Fig. 1；
Fig. 3 is enlarged diagram at B in Fig. 2；
Fig. 4 is the C-C directions sectional schematic diagram of Fig. 1；
Fig. 5 is enlarged diagram at D in Fig. 4；
Fig. 6 is the structural representation of air intake backup lining brick；
Fig. 7 is the right view of Fig. 6；
Fig. 8 is the upward view of Fig. 6；
Fig. 9 is the top view of Fig. 6；
Figure 10 be Fig. 6 in E-E to profile；
Figure 11 is the structural representation of circulation backup lining brick；
Figure 12 is the right view of Figure 11；
Figure 13 is the upward view of Figure 11；
Figure 14 is the top view of Figure 11；
Figure 15 be Figure 11 in F-F to profile；
Figure 16 is process flow diagram of the invention；
In figure, 1, cylinder；2nd, middle part conversion zone；3rd, air intake endless tube；4th, air supply line；5th, wind regime；6th, branch's airduct；7th, gold
Category barrel wall；8th, circulation backup lining brick；9th, air intake backup lining brick；10th, backup lining brick is sealed；11st, cross blowhole；12nd, radial direction blast pipe
Road；13rd, fresh air inlet；14th, circumferential ventilating hole channel；15th, axial ventilation duct；16th, annular passage；17th, brick ridge；18th, radial ventilation
Hole；19th, branch's airduct valve；20th, main valve；21st, air supply line valve；22nd, refractory brick support；23rd, embedded iron；24th, cross
Blowhole support；25th, alumina silicate fibre hardboard；26th, female mouth；27th, rim of the mouth.
Specific embodiment
Principle of the invention and feature are described below in conjunction with example, example is served only for explaining the present invention, and
It is non-for limiting the scope of the present invention.
The porous type rotary kiln that the present invention is used, including cylinder 1, the cylinder 1 include middle part conversion zone 2, its it is special it
Place is that multiple tracks air intake endless tube 3 is interval with outside the middle part conversion zone 2, and air intake endless tube 3 described in multiple tracks passes through air supply line
4 connect with wind regime 5；Branch's airduct 6 is radially evenly equipped with the air intake endless tube 3；
The cylinder 1 includes metal cylinder body wall 7 and is embedded in the flame retardant coating of the inner side of the metal cylinder body wall 7, the fire resisting
Layer includes the refractory brick by female mouth 26 and rim of the mouth 27 mutually overlap joint, and the refractory brick includes circulation backup lining brick 8, air intake backup lining brick
9 and sealing backup lining brick 10；Be provided with cross blowhole 11 inside the circulation backup lining brick 8, the air intake backup lining brick 9 from outer to inner according to
It is secondary to be provided with interconnected radial direction intake stack 12 and cross blowhole 11, the air intake backup lining brick 9 and the metal cylinder body wall 7 it
Between be provided with the fresh air inlet 13 connected with radial direction intake stack 12；Described cross blowhole 11 is by circumferential ventilating hole channel 14 and axially
Ventilating hole channel 15 is formed, and multiple circumferential ventilating hole channels 14 form annular passage 16, the inner side connection of the annular passage 16
There are the radial air openings 18 in the interval of brick ridge 17；The sealing backup lining brick 10 is solid brick body, and the sealing backup lining brick 10 is provided with
Polylith, is disposed in the annular passage 16；Branch's airduct 6 is by fresh air inlet 13 and air intake backup lining brick 9 and revolution
Kiln chamber, branch's airduct 6 is provided with branch airduct valve 19；
Main valve 20 is provided between the air intake endless tube 3 and the wind regime 5, the air supply line 4 is provided with air supply line
Valve 21；
The circulation backup lining brick 8, air intake backup lining brick 9 and sealing backup lining brick 10 are solid by refractory brick support 22 and embedded iron 23
Surely it is embedded in the inner side of the metal cylinder body wall 7；
The cross blowhole 11 is fixed in annular passage 16 by cross blowhole support 24；
Alumina silicate fibre hardboard 25 is provided between the circulation backup lining brick 8 and the metal cylinder body wall 7；
Described wind regime 5 is blower fan, can be using conventional slip ring power supply device fan supply power supply.
In Fig. 6 and Figure 11, α is chamfering, generally the circular arc chamfering of 10~30mm of ￠；￠ β are angle, can be according to rotary kiln
The diameter of cylinder and every piece of quantity of fragment of brick calculate the angle of its angle.
Embodiment 1
A kind of method of utilization high-temperature oxydation pelletizing sensible heat direct-reduction production metallized pellet, step is as follows：
(1) it is the Chaoyang grade TFe that -200 mesh account for 80% to take fineness:68.2% magnetite powder, with addition of Iron Ore Powder
The sodium humate mixing of weight 2.0%, profit mill, pelletizing, pelletizing granularity is ￠ 8~￠ 16mm, is dried in 105 DEG C of Muffle furnace
4h, is rapidly heated to 1200 DEG C in acid pellet rotary kiln, continues to sinter 18min, obtains 1200 DEG C of high-temperature oxydation pelletizings；
(2) the high-temperature oxydation pelletizing of step (1) is taken, with addition of the smokeless of high-temperature oxydation pelletizing weight 45%, granularity 0-15mm
(its chemical composition is by mass percentage for fixed carbon is that 69.12%, ash is that 15.14%, fugitive constituent 12.6%, S is to coal
2.14%) 20min, is preheated at 800 DEG C after mixing, flame-insulating type drastic reduction rotary kiln is added, depth is carried out under the conditions of 1080 DEG C
Degree reduction reaction 2.8h, taking-up is reduced thing, 4h is cooled down with addition of coal dust covering by the 50% of acid pellet weight, by magnetic separation point
From coal tar and metallized pellet is obtained, magnetic separation strength is 3200Gs, the TFe of gained metallized pellet：91.66%th, MFe：
87.10%th, η Fe：95.02% and 20.8% destructive distillation coal；The high PG composition of recovery is CO：40.12%th, CO2：
19.05%th, H2：17.94%th, N2：2.22%th, CH4：1.35%th, H2O：11.2%.
Embodiment 2
A kind of method of utilization high-temperature oxydation pelletizing sensible heat direct-reduction production metallized pellet, step is as follows：
(1) it is the Jilin Province Yanji grade TFe that -200 mesh account for more than 80% to take fineness:69.21% Iron Ore Powder, with addition of
The anthracite of Iron Ore Powder weight 5%, 2% water-soluble poval fine powder, uniform mixed grind, spray water pelletizing, pelletizing granularity be ￠ 8~
￠ 16mm, pelletizing dries 4h in 105 DEG C of Muffle furnace, is rapidly heated in acid pellet rotary kiln to 1230 DEG C, continues to burn
Knot 15min, obtains 1230 DEG C of high-temperature oxydation pelletizings；
(2) 1230 DEG C of high-temperature oxydation pelletizings of step (1) are taken, with addition of high-temperature oxydation pelletizing weight 40%, granularity 0-10mm
Anthracite (its chemical composition by mass percentage for fixed carbon be 59.20%, ash be 8.41%, fugitive constituent 31.60%, S
0.5%), after the two mixing, after being calcined 20min at 1050 DEG C, flame-insulating type drastic reduction rotary kiln to be added, in 1075 DEG C of conditions
Under carry out drastic reduction reaction 2.8h, take out pelletizing, by acid pellet weight 50% with addition of coal dust cover cool down, by magnetic separation
Coal tar and metallized pellet are separated to obtain, magnetic separation strength is 3200Gs, obtain TFe：92.53%th, MFe：88.73%th, η Fe：
95.69% metallized pellet and 22% destructive distillation coal, the high PG for volatilizing directly light burning.
Embodiment 3
(1) it is the Chaoyang grade TFe that -200 mesh account for 80% to take fineness:70.02% magnetite powder, with addition of Iron Ore Powder
The malt sugar mixing of weight 2.0%, profit mill, pelletizing, pelletizing granularity is ￠ 8~￠ 16mm, and 4h is dried in 105 DEG C of Muffle furnace,
It is rapidly heated in acid pellet rotary kiln to 1200 DEG C, sinters 18min, obtains 1200 DEG C of high-temperature oxydation pelletizings；
(2) 1200 DEG C of high-temperature oxydation pelletizings of step (1) are taken, with addition of high-temperature oxydation pelletizing weight 45%, granularity 0-15mm
Anthracite (its chemical composition by mass percentage for fixed carbon be 69.12%, ash be 15.14%, fugitive constituent 12.6%, S
2.14%), 20min to be calcined at 1050 DEG C after mixing, the rotary kiln of flame-insulating type drastic reduction is added, entered under the conditions of 1075 DEG C
Row drastic reduction reacts 3.0h, takes out pelletizing, is covered with addition of coal dust by the 45% of its weight and cooled down, and coal tar is separated to obtain by magnetic separation
And metallized pellet, magnetic separation strength is 3200Gs, the TFe of gained metallized pellet：93.16%th, MFe：87.10%th, η Fe：
93.49% and 21% destructive distillation coal, the high PG for volatilizing directly lights burning.
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all it is of the invention spirit and
Within principle, any modification, equivalent substitution and improvements made etc. should be included within the scope of the present invention.
Claims (8)
1. a kind of method that utilization high-temperature oxydation pelletizing sensible heat direct-reduction produces metallized pellet, it is characterised in that step is such as
Under：
(1) mesh of fineness -200 is accounted for into more than 80%, grade TFe >=67.0% Iron Ore Powder, with addition of the nothing of Iron Ore Powder weight 0~8%
Bituminous coal, 2.0% binding agent, are mixed, are moistened mill, pelletizing, and pelletizing granularity is Φ 8~Φ 16mm, in 105~280 DEG C of temperature
Degree 4~6h of lower drying, is warmed up to 1200~1250 DEG C in acid pellet rotary kiln, continues to sinter 15~20min, obtain 1200~
1250 DEG C of high-temperature oxydation pelletizing；
(2) the high-temperature oxydation pelletizing of step (1) is taken, according to high-temperature oxydation pelletizing weight with addition of 40~50%, 0~20mm's of granularity
Anthracite, after mixing at a temperature of 800~1050 DEG C, adds flame-insulating type drastic reduction rotary kiln, in 1060~1080 DEG C of conditions
Under carry out drastic reduction react 2.5~3.2h, take out pelletizing, by pelletizing weight 30~50% with addition of coal dust cover cool down, it is cold
But after 4h, coal tar and metallized pellet are separated to obtain by magnetic separation, magnetic separation strength is 3200Gs, and the index of gained metallized pellet is
TFe >=90.0%, MFe >=84.0%, η Fe >=93.0%, and reclaim 20~22% destructive distillation coal tar；
Flame-insulating type drastic reduction rotary kiln described in step (2) is porous type rotary kiln；
The porous type rotary kiln includes cylinder, and the cylinder includes middle part conversion zone, is spaced outside the middle part conversion zone and set
There is multiple tracks air intake endless tube, air intake endless tube is connected by air supply line with wind regime described in multiple tracks；It is radially equal on the air intake endless tube
It is furnished with branch's airduct；
The cylinder includes metal cylinder body wall and the flame retardant coating that is embedded on the inside of the metal cylinder body wall, the flame retardant coating include according to
The refractory brick that Kao Mukou and rim of the mouth mutually overlap, the refractory brick includes circulation backup lining brick, air intake backup lining brick and sealing backup lining brick；
Cross blowhole is provided with inside the circulation backup lining brick, the air intake backup lining brick is from outer to inner sequentially provided with to be interconnected and radially enter
Wind pipeline and cross blowhole, are provided with what is connected with radial direction intake stack between the air intake backup lining brick and the metal cylinder body wall
Fresh air inlet；Described cross blowhole is formed by circumferential ventilating hole channel and axial ventilation duct, multiple circumferential ventilating hole channels
Annular passage is formed, the radial air openings in brick ridge interval are communicated with the inside of the annular passage；It is described sealing backup lining brick be
Solid brick body, the sealing backup lining brick is provided with polylith, is disposed in the annular passage；Branch's airduct passes through air intake
Hole and air intake backup lining brick and rotary kiln chamber, branch's airduct are provided with branch's airduct valve.
2. method according to claim 1, it is characterised in that described binding agent is sodium humate, dextrin, syrup, paper
Pulp waste, malt sugar or water-soluble poval.
3. method according to claim 1, it is characterised in that the anthracitic composition fraction by weight is calculated as：It is fixed
Carbon >=65%, ash≤10%, fugitive constituent≤20% and S≤0.5%.
4. method according to claim 1, it is characterised in that the composition of coal dust fraction meter by weight described in step (2)
For：Fixed carbon >=65%, ash≤10%, fugitive constituent≤20%, S≤0.5%.
5. method according to claim 1, it is characterised in that the destructive distillation coal Jiaozhuo obtained by step (2) is and high-temperature oxydation
The reducing agent of pelletizing mixing preheating, recycles.
6. method according to claim 1, it is characterised in that be provided with main valve between the air intake endless tube and the wind regime
Door, the air supply line is provided with air supply line valve.
7. method according to claim 1, it is characterised in that the circulation backup lining brick, air intake backup lining brick and sealing furnace lining
Brick is embedded in the metal cylinder body wall inner side by refractory brick support and pre-buried ferropexy.
8. method according to claim 1, it is characterised in that the cross blowhole is fixed on by cross blowhole support
In annular passage；Alumina silicate fibre hardboard is provided between the circulation backup lining brick and the metal cylinder body wall.
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| CN201510527945.3A CN105177292B (en) | 2015-08-25 | 2015-08-25 | A kind of method of utilization high-temperature oxydation pelletizing sensible heat direct-reduction production metallized pellet |
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| CN105177292B true CN105177292B (en) | 2017-06-27 |
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Effective date of registration: 20190125 Address after: 362000 Building 201 of Century Dynasty A, Tian'an Road, Fengze District, Quanzhou City, Fujian Province Patentee after: Quanzhou Huanfeng Metallurgical Technology Co., Ltd. Address before: Room 908, East Tower, Venture Building, Science and Technology Avenue, Yantai High-tech Zone, Shandong Province Patentee before: Tang Zhusheng |
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Granted publication date: 20170627 Termination date: 20200825 |
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| CF01 | Termination of patent right due to non-payment of annual fee |