CN114182091A - Cold press molding method for steel-making iron-containing solid waste - Google Patents
Cold press molding method for steel-making iron-containing solid waste Download PDFInfo
- Publication number
- CN114182091A CN114182091A CN202111503605.9A CN202111503605A CN114182091A CN 114182091 A CN114182091 A CN 114182091A CN 202111503605 A CN202111503605 A CN 202111503605A CN 114182091 A CN114182091 A CN 114182091A
- Authority
- CN
- China
- Prior art keywords
- solid waste
- iron
- steelmaking
- cold press
- steel
- 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.)
- Pending
Links
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 112
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 59
- 239000002910 solid waste Substances 0.000 title claims abstract description 58
- 238000009628 steelmaking Methods 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000000465 moulding Methods 0.000 title claims abstract description 18
- 239000002994 raw material Substances 0.000 claims abstract description 41
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000000853 adhesive Substances 0.000 claims abstract description 21
- 230000001070 adhesive effect Effects 0.000 claims abstract description 21
- 239000000292 calcium oxide Substances 0.000 claims abstract description 19
- 235000012255 calcium oxide Nutrition 0.000 claims abstract description 19
- 238000001035 drying Methods 0.000 claims abstract description 11
- 238000003756 stirring Methods 0.000 claims abstract description 11
- 239000000428 dust Substances 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 8
- 238000005303 weighing Methods 0.000 claims abstract description 8
- 229920000881 Modified starch Polymers 0.000 claims abstract description 6
- 239000004115 Sodium Silicate Substances 0.000 claims abstract description 6
- 239000000440 bentonite Substances 0.000 claims abstract description 6
- 229910000278 bentonite Inorganic materials 0.000 claims abstract description 6
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000004568 cement Substances 0.000 claims abstract description 6
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052911 sodium silicate Inorganic materials 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- 238000002156 mixing Methods 0.000 claims description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- 238000005096 rolling process Methods 0.000 claims description 9
- 238000003860 storage Methods 0.000 claims description 9
- 239000002893 slag Substances 0.000 claims description 5
- 230000007062 hydrolysis Effects 0.000 claims description 4
- 238000006460 hydrolysis reaction Methods 0.000 claims description 4
- 238000009749 continuous casting Methods 0.000 claims description 3
- 239000011230 binding agent Substances 0.000 claims 1
- 238000005406 washing Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 12
- 238000003723 Smelting Methods 0.000 abstract description 2
- 238000006477 desulfuration reaction Methods 0.000 abstract description 2
- 230000023556 desulfurization Effects 0.000 abstract description 2
- 238000003825 pressing Methods 0.000 abstract description 2
- 230000003301 hydrolyzing effect Effects 0.000 abstract 1
- 238000000227 grinding Methods 0.000 description 5
- 239000010802 sludge Substances 0.000 description 4
- 238000011010 flushing procedure Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000001238 wet grinding Methods 0.000 description 1
Classifications
-
- 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
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Life Sciences & Earth Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to a cold press molding method of steel-making iron-containing solid waste, wherein the raw materials comprise the steel-making solid waste, quicklime, iron scale and adhesive, the adhesive comprises pregelatinized starch, bentonite, sodium silicate, cement and total iron (TFe), and the raw material proportion adopts the following proportion: 60% of steel-making solid waste, 13% of quicklime, 25% of iron scale and 2% of adhesive, and the method comprises the following steps: (1) hydrolyzing the mixed material; (2) weighing and feeding; (3) stirring and adjusting; (4) cold press molding; (5) drying and warehousing; the invention can carry out cold pressing balling on high-iron content, high-moisture dust and solid waste generated by the OG system through common equipment by reducing moisture and proportioning, replaces part of steelmaking raw materials, carries out converter smelting consumption and application through a high-level stock bin, reduces the steelmaking production process cost, and plays a certain role in dephosphorization and desulfurization to the converter.
Description
Technical Field
The invention relates to the field of recycling of steel-making iron-containing solid waste, in particular to a cold press molding method of steel-making iron-containing solid waste.
Background
At present, dust generated in the metallurgical industry is focused by the national environmental protection industry, in order to reduce dust overflow in production, the OG system is used for dust treatment in the general steel industry at present, high-iron content and high-moisture dust is formed after extrusion through a filter press, the iron content is more than or equal to 60 percent, and the moisture is about 40 percent, so that the recycling of the iron-containing sludge can reduce the production cost of steel making and improve the production benefit of industry, meanwhile, the iron-containing sludge has certain benefits in molten iron dephosphorization in the production process, along with the continuous development of the metallurgical industry, the OG system generates the iron-containing sludge to be recycled to obtain most of industry attention, and the water content of the sludge generated by the OG system is about 40 percent, so that the direct steel making consumption can not be realized, and the production and safety influence is great.
Disclosure of Invention
The invention aims to provide a cold press molding method for iron-containing solid waste in steelmaking, which can carry out cold press balling on high-iron content, high-moisture dust and solid waste generated by an OG system through ordinary equipment by reducing moisture and proportioning, replaces part of steelmaking raw materials, and is consumed and applied in converter smelting through a high-level bunker.
In order to achieve the above purpose, the following technical scheme is provided:
the cold press molding method of the steel-making iron-containing solid waste comprises the following raw materials of the steel-making solid waste, quick lime, iron scale and adhesive, wherein the adhesive comprises pregelatinized starch, bentonite, sodium silicate, cement and total iron (TFe), and the raw material proportion adopts the following proportion: 60% of steel-making solid waste, 13% of quicklime, 25% of iron scale and 2% of adhesive.
Preferably, the method for cold press molding of the steelmaking iron-containing solid waste comprises the following steps:
(1) and (3) mixed material hydrolysis: mixing the steelmaking solid waste with quicklime, stirring by using a storage tank and a forklift, standing for 48 hours to ensure that water in the solid waste reacts with the quicklime to be fully hydrolyzed, mixing the steelmaking solid waste with the quicklime, and then putting the solid waste with the water content reduced by less than 10 percent into a raw material bin;
(2) weighing and feeding: quantitatively weighing the solid waste, the iron scale and the adhesive by using a quantitative feeder, and adding the weighed solid waste, the iron scale and the adhesive into a wet mill through a feeding belt conveyor respectively;
(3) stirring and adjusting: adding a proper amount of water into a wet mill added with the raw materials to ensure that the water content of the raw materials is 10-12%, fully stirring and mixing the raw materials for 10-30min under the action of a rolling wheel and a scraper, wherein the rotating speed of the rolling wheel is 60r/min, fully and uniformly mixing the stirred raw materials and increasing the density of the raw materials;
(4) cold press molding: adding the raw materials stirred and compacted by a wet mill into a cold press to be extruded into square balls;
(5) drying and warehousing: drying, namely putting the cold-pressed and molded raw material square balls into a ball basket, drying the square balls by utilizing a heat source at a storage place for producing the steel billets, and warehousing the dried finished products.
Preferably, the adhesive comprises the following components in percentage by weight: pre-gelatinized starch: bentonite: sodium silicate: cement: total iron (TFe) 27:40:20:10: 3.
Preferably, the steelmaking solid waste is high-iron high-moisture dust and solid waste generated by a steelmaking OG system, and the total iron (TFe) content of the steelmaking solid waste is more than or equal to 60%.
Preferably, the iron scale is a filtered and recovered product of slag flushing water of continuous casting and steel rolling.
Preferably, in the step (5), the size of the square ball is 40mm × 40mm × 20 mm.
The invention has the beneficial effects that:
1. the invention utilizes the heat source of the production field to dry and dry the cold-pressed raw material square balls without additionally arranging baking equipment, thereby saving the production cost.
2. The invention solves the problem that the dust and solid waste with high iron content and high moisture content generated by the OG system in the converter industry can not be consumed and recycled under the normal temperature condition of the conventional equipment.
3. After the cold-pressing raw material square balls manufactured by the method are smelted and consumed in a converter through a high-position bunker, the consumption of steel and iron materials is reduced from 1082.2kg/t to 1075kg/t at present, the consumption of slag materials is reduced from 54.39kg/t to 50.89kg/t, the cost of the comprehensive ton steel production is reduced by 18.65 yuan, a part of steel-making raw materials are replaced, the steel and iron materials and the slag materials required by the production are obviously reduced, the cost of the steel-making production process is reduced, and meanwhile, a certain dephosphorization and desulfurization effect is realized on the converter.
Detailed Description
The following describes in detail embodiments of the present invention with reference to specific embodiments.
The cold press molding method of the steel-making iron-containing solid waste comprises the following raw materials of steel-making solid waste, quicklime, iron scale and adhesive, wherein the steel-making solid waste is high-iron high-moisture dust and solid waste generated by a steel-making OG system, the content of total iron (TFe) is more than or equal to 60 percent, the iron scale is a product recovered by filtering slag flushing water of continuous casting and steel rolling, the adhesive comprises the following components: pre-gelatinized starch: bentonite: sodium silicate: cement: the total iron (TFe) is 27:40:20:10:3, and the following raw materials are adopted in proportion: 60% of steel-making solid waste, 13% of quicklime, 25% of iron scale and 2% of adhesive.
The cold press molding method of the steelmaking iron-containing solid waste comprises the following steps:
(1) and (3) mixed material hydrolysis: mixing the steelmaking solid waste with quicklime, stirring by using a storage tank and a forklift, standing for 48 hours to ensure that water in the solid waste reacts with the quicklime to be fully hydrolyzed, mixing the steelmaking solid waste with the quicklime, and then putting the solid waste with the water content reduced by less than 10 percent into a raw material bin;
(2) weighing and feeding: quantitatively weighing the solid waste, the iron scale and the adhesive by using a quantitative feeder, and adding the weighed solid waste, the iron scale and the adhesive into a wet mill through a feeding belt conveyor respectively;
(3) stirring and adjusting: adding a proper amount of water into a wet mill added with the raw materials to ensure that the water content of the raw materials is 10-12%, fully stirring and mixing the raw materials for 10-30min under the action of a rolling wheel and a scraper, wherein the rotating speed of the rolling wheel is 60r/min, fully and uniformly mixing the stirred raw materials and increasing the density of the raw materials;
cold press molding: adding the raw materials stirred and compacted by a wet mill into a cold press to be extruded into square balls;
(5) drying and warehousing: drying, namely putting the cold-pressed raw material square balls into a ball basket, drying the square balls by utilizing a heat source at a storage place for producing the steel billets, wherein the size of the square balls is 40mm multiplied by 20mm, and putting the dried finished products into a warehouse.
Examples
Adding 60 tons of steel-making solid waste into a storage pool, gradually adding 13 tons of sieved quicklime into the storage pool, stirring for 1 hour by using a forklift, standing for 48 hours at normal temperature to enable the steelmaking solid waste to react with quick lime for full hydrolysis, weighing 25 tons of hydrolyzed solid waste, 25 tons of iron scale and 2 tons of adhesive by using a constant feeder, adding the solid waste, 25 tons of iron scale and 2 tons of adhesive into a wet grinding machine, grinding for 15 minutes (the rotating speed of a grinding wheel is 60r/min, the mass of the grinding wheel is 10 tons), adding a proper amount of water in the grinding process, adjusting the water content of the mixed raw materials, keeping the water content at 10% -12%, extruding the raw materials into raw material square balls with the size of 40mm multiplied by 20mm by a cold press (the linear pressure ratio is more than or equal to 0.25t/mm) after grinding, loading the raw material square balls subjected to cold press molding into a ball basket, drying the square balls by using a heat source at a billet production storage position, increasing the strength, and warehousing the dried finished products.
Claims (6)
1. The cold press molding method of the steel-making iron-containing solid waste is characterized in that raw materials comprise steel-making solid waste, quick lime, iron scale and an adhesive, the adhesive comprises pregelatinized starch, bentonite, sodium silicate, cement and total iron (TFe), and the raw material proportion adopts the following proportion: 60% of steel-making solid waste, 13% of quicklime, 25% of iron scale and 2% of adhesive.
2. The method for cold press forming of steelmaking iron-containing solid waste as claimed in claim 1 wherein the method for cold press forming of steelmaking iron-containing solid waste includes the steps of:
(1) and (3) mixed material hydrolysis: mixing the steelmaking solid waste with quicklime, stirring by using a storage tank and a forklift, standing for 48 hours to ensure that water in the solid waste reacts with the quicklime to be fully hydrolyzed, mixing the steelmaking solid waste with the quicklime, and then putting the solid waste with the water content reduced by less than 10 percent into a raw material bin;
(2) weighing and feeding: quantitatively weighing the solid waste, the iron scale and the adhesive by using a quantitative feeder, and adding the weighed solid waste, the iron scale and the adhesive into a wet mill through a feeding belt conveyor respectively;
(3) stirring and adjusting: adding a proper amount of water into a wet mill added with the raw materials to ensure that the water content of the raw materials is 10-12%, fully stirring and mixing the raw materials for 10-30min under the action of a rolling wheel and a scraper, wherein the rotating speed of the rolling wheel is 60r/min, fully and uniformly mixing the stirred raw materials and increasing the density of the raw materials;
(4) cold press molding: adding the raw materials stirred and compacted by a wet mill into a cold press to be extruded into square balls;
(5) drying and warehousing: drying, namely putting the cold-pressed and molded raw material square balls into a ball basket, drying the square balls by utilizing a heat source at a storage place for producing the steel billets, and warehousing the dried finished products.
3. The cold press molding method for the steelmaking iron-containing solid waste as claimed in claim 1, wherein the binder comprises the following components in proportion: pre-gelatinized starch: bentonite: sodium silicate: cement: total iron (TFe) 27:40:20:10: 3.
4. The method for cold press molding of steelmaking iron-containing solid waste as claimed in claim 1, wherein the steelmaking solid waste is high-iron high-moisture dust and solid waste generated by a steelmaking OG system, and the total iron (TFe) content of the steelmaking iron-containing solid waste is more than or equal to 60%.
5. The method for cold press molding of steelmaking iron-containing solid waste as claimed in claim 1, wherein the scale is a filtered recycled product of continuous casting and steel rolling slag washing water.
6. The cold press forming method for the steelmaking iron-containing solid waste as claimed in claim 2, wherein in the step (5), the size of the square balls is 40mm x 20 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111503605.9A CN114182091A (en) | 2021-12-10 | 2021-12-10 | Cold press molding method for steel-making iron-containing solid waste |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111503605.9A CN114182091A (en) | 2021-12-10 | 2021-12-10 | Cold press molding method for steel-making iron-containing solid waste |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114182091A true CN114182091A (en) | 2022-03-15 |
Family
ID=80604211
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111503605.9A Pending CN114182091A (en) | 2021-12-10 | 2021-12-10 | Cold press molding method for steel-making iron-containing solid waste |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114182091A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2009222C1 (en) * | 1992-04-15 | 1994-03-15 | Научно-производственное предприятие "Экомет" | Method for production of pellets for blast furnace plant |
| CN1095761A (en) * | 1993-05-28 | 1994-11-30 | 首钢总公司 | Method and device that mud produced by wet dust removal of converter is recycled |
| CN102808079A (en) * | 2012-08-22 | 2012-12-05 | 秦皇岛首秦金属材料有限公司 | Thermosetting red mud block and preparation method thereof |
| CN103320607A (en) * | 2013-07-05 | 2013-09-25 | 首钢京唐钢铁联合有限责任公司 | Cold curing ball and preparation method thereof |
| JP2014210942A (en) * | 2013-04-17 | 2014-11-13 | 日新製鋼株式会社 | Iron resource regeneration method |
| JP2018119178A (en) * | 2017-01-25 | 2018-08-02 | 日新製鋼株式会社 | Method for producing agglomerate for steel making |
| CN110016551A (en) * | 2019-05-06 | 2019-07-16 | 中冶华天工程技术有限公司 | Cold rolling sludge converter resource utilization method |
| CN111944946A (en) * | 2020-08-17 | 2020-11-17 | 河北蓝海智投环保科技有限公司 | Dedusting ash cold pressing block and preparation method and application thereof |
| CN113073199A (en) * | 2021-03-25 | 2021-07-06 | 河北蓝海智投环保科技有限公司 | Special composite additive for metallurgical and coking solid waste treatment and application thereof |
-
2021
- 2021-12-10 CN CN202111503605.9A patent/CN114182091A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2009222C1 (en) * | 1992-04-15 | 1994-03-15 | Научно-производственное предприятие "Экомет" | Method for production of pellets for blast furnace plant |
| CN1095761A (en) * | 1993-05-28 | 1994-11-30 | 首钢总公司 | Method and device that mud produced by wet dust removal of converter is recycled |
| CN102808079A (en) * | 2012-08-22 | 2012-12-05 | 秦皇岛首秦金属材料有限公司 | Thermosetting red mud block and preparation method thereof |
| JP2014210942A (en) * | 2013-04-17 | 2014-11-13 | 日新製鋼株式会社 | Iron resource regeneration method |
| CN103320607A (en) * | 2013-07-05 | 2013-09-25 | 首钢京唐钢铁联合有限责任公司 | Cold curing ball and preparation method thereof |
| JP2018119178A (en) * | 2017-01-25 | 2018-08-02 | 日新製鋼株式会社 | Method for producing agglomerate for steel making |
| CN110016551A (en) * | 2019-05-06 | 2019-07-16 | 中冶华天工程技术有限公司 | Cold rolling sludge converter resource utilization method |
| CN111944946A (en) * | 2020-08-17 | 2020-11-17 | 河北蓝海智投环保科技有限公司 | Dedusting ash cold pressing block and preparation method and application thereof |
| CN113073199A (en) * | 2021-03-25 | 2021-07-06 | 河北蓝海智投环保科技有限公司 | Special composite additive for metallurgical and coking solid waste treatment and application thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101665868B (en) | Method for utilizing stainless steel removed dust as ironmaking raw material | |
| CN101560583B (en) | Converter coolant taking metallurgical waste as raw material and manufacturing method thereof | |
| CN103320607B (en) | Cold curing ball and preparation method thereof | |
| CN1804057A (en) | Method for making pellet by fine-grinded steel slag instead of bentonite | |
| CN103031400B (en) | Technology for steelmaking through utilizing magnesium balls prepared from scraps and steel slag | |
| CN113337707A (en) | Method for preparing cold-pressed balls for iron-making blast furnace and improving utilization rate of waste | |
| CN100543150C (en) | Composite cooling agent for steel-smelting and producing and manufacturing technique | |
| CN101413042B (en) | Slag-forming constituent and preparation thereof | |
| CN101560581B (en) | Converter coolant and manufacturing method thereof | |
| CN114182091A (en) | Cold press molding method for steel-making iron-containing solid waste | |
| CN111961868A (en) | Digestion preparation method of converter waste sludge | |
| CN107641711A (en) | Utilize steel rolling oily sludge and the method for blast furnace dust production revolving furnace slag pressing agent | |
| CN109929995B (en) | Aluminum ash pellet binder and preparation method thereof | |
| KR101185362B1 (en) | A production method of briquette using waste materials of steel making | |
| CN105861819A (en) | Pressing block production process for oxide iron scale cutting slag added with metal bonding agent | |
| CN1244708C (en) | Preparation method for making block of dust mud of smelting steel by high pressure and cold solidifing | |
| CN101831539B (en) | Method for producing artificial rich iron ore from copper smelting waste slag by using new sintering technology | |
| CN101831549B (en) | Method for producing artificial rich iron ore from nickel, copper and cobalt smelting waste slag by utilizing new sintering process | |
| CN101831555B (en) | Method for producing artificial rich iron ore from nickel smelting waste slag by utilizing new sintering process | |
| CN112442569A (en) | Operation method for efficiently recycling chromium element | |
| KR100674260B1 (en) | Dust Briguette | |
| CN112981094A (en) | Ferrosilicon composite ball for steelmaking and preparation method thereof | |
| CN117867192B (en) | Metallurgical solid waste material subjected to low-carbon self-circulation recovery treatment and preparation and use methods thereof | |
| CN108642273B (en) | Iron-carbon-silicon double-layer composite pellet for modifying converter slag and preparation method thereof | |
| CN105648206A (en) | Steelmaking sludge recycling method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: 132301 Shengli Street, Mingcheng Town, Panshi City, Jilin City, Jilin Province Applicant after: Panshi Jianlong Steel Co.,Ltd. Address before: 132301 Shengli Street, Mingcheng Town, Panshi City, Jilin City, Jilin Province Applicant before: Jilin Henglian Precision Foundry Technology Co.,Ltd. |