CN111922045A - Process for recovering ferrosilicon from waste residues - Google Patents
Process for recovering ferrosilicon from waste residues Download PDFInfo
- Publication number
- CN111922045A CN111922045A CN202010790268.5A CN202010790268A CN111922045A CN 111922045 A CN111922045 A CN 111922045A CN 202010790268 A CN202010790268 A CN 202010790268A CN 111922045 A CN111922045 A CN 111922045A
- Authority
- CN
- China
- Prior art keywords
- waste
- ferrosilicon
- reactor
- calcium carbide
- water
- 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
- 239000002699 waste material Substances 0.000 title claims abstract description 63
- 229910000519 Ferrosilicon Inorganic materials 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 35
- 239000005997 Calcium carbide Substances 0.000 claims abstract description 23
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 claims abstract description 16
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 claims abstract description 16
- 239000002002 slurry Substances 0.000 claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 claims abstract description 12
- 239000002910 solid waste Substances 0.000 claims abstract description 9
- 238000006243 chemical reaction Methods 0.000 claims abstract description 8
- 239000000843 powder Substances 0.000 claims abstract description 8
- 238000007599 discharging Methods 0.000 claims abstract description 7
- 239000012295 chemical reaction liquid Substances 0.000 claims abstract description 4
- 238000005406 washing Methods 0.000 claims description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 10
- 238000001914 filtration Methods 0.000 claims description 9
- 239000007789 gas Substances 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 4
- 239000010812 mixed waste Substances 0.000 claims description 3
- 238000004064 recycling Methods 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- 239000000126 substance Substances 0.000 abstract description 3
- 238000011027 product recovery Methods 0.000 abstract description 2
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000002893 slag Substances 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 229910001021 Ferroalloy Inorganic materials 0.000 description 1
- 229910000676 Si alloy Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 229910000639 Spring steel Inorganic materials 0.000 description 1
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
Landscapes
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention provides a process for recovering ferrosilicon from waste residues, and relates to the technical field of chemical product recovery processes. The process for recovering ferrosilicon from waste residue comprises the following steps: s1, firstly, putting solid waste powder containing ferrosilicon and calcium carbide into a waste receiving bin; s2, continuously conveying the waste in the waste receiving bin into a waste reactor through a waste conveyor; s3, introducing water into the waste reactor to react with calcium carbide in the solid waste powder, wherein the water reacts with the calcium carbide to generate acetylene gas, and the generated acetylene gas is merged into a production network through an exhaust pipeline; and S4, after the calcium carbide in the waste material reactor is consumed by reaction, discharging the slurry formed by mixing the residual ferrosilicon and the reaction liquid through a discharge port of the reactor. The process designed by the invention can screen and detect clean ferrosilicon from waste residues, can be sold directly, increases the income, and can also recover harmful dispersed calcium carbide and generate acetylene gas, thereby improving the yield of acetylene and reducing the cost required by production.
Description
Technical Field
The invention relates to the technical field of chemical product recovery processes, in particular to a process for recovering ferrosilicon from waste residues.
Background
Ferrosilicon, i.e. ferrosilicon, which is an iron alloy consisting of iron and silicon, the ferrosilicon being cokeCarbon, steel scraps and quartz (or silica) are used as raw materials, and the iron-silicon alloy is prepared by smelting in an electric furnace. Since silicon and oxygen are easily synthesized into silica, ferrosilicon is commonly used as a deoxidizer in steel making, and simultaneously, since SiO is used as a deoxidizer2The heat is released in a large amount during the production, and it is advantageous to raise the temperature of molten steel while deoxidizing. Meanwhile, the ferrosilicon can also be used as an alloy element additive and widely applied to low-alloy structural steel, spring steel, bearing steel, heat-resistant steel and electrical silicon steel, and is commonly used as a reducing agent in ferroalloy production and chemical industry.
Firstly, in the crushing process of calcium carbide, calcium carbide and silicon iron are separated to obtain silicon iron waste residues, but because of the production limitation of a calcium carbide production process, part of calcium carbide is wrapped in the silicon iron, so that the waste residues are dangerous, and a method is needed for safely separating the silicon iron; secondly, in the dry acetylene generation process, the carbide slag contains ferrosilicon and carbide particles, and the ferrosilicon and the carbide particles can be separated from the carbide slag through screening, but the screened ferrosilicon and carbide are a mixture, so that the ferrosilicon is dangerous and needs to be safely separated to obtain ferrosilicon; in view of the above, it is desirable to design a process for recovering ferrosilicon from waste slag.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a process for recovering ferrosilicon from waste residues, which solves the problem that solid wastes such as ferrosilicon-containing waste residues and calcium carbide dust generated in the existing acetylene production process cannot be reasonably treated.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: a process for recovering ferrosilicon from waste residue comprises the following steps:
s1, firstly, putting solid waste powder containing ferrosilicon and calcium carbide into a waste receiving bin;
s2, continuously conveying the waste in the waste receiving bin into a waste reactor through a waste conveyor;
s3, introducing water into the waste reactor to react with calcium carbide in the solid waste powder, wherein the water reacts with the calcium carbide to generate acetylene gas, and the generated acetylene gas is merged into a production network through an exhaust pipeline;
s4, after the calcium carbide in the waste material reactor is consumed by reaction, discharging the slurry formed by mixing the residual ferrosilicon and the reaction liquid through a discharge port of the reactor, and feeding the slurry into a ferrosilicon filtering washer;
s5, introducing water into the inner end of the filtering washer to filter and wash the slurry containing the ferrosilicon, separating and simultaneously washing the ferrosilicon from the slurry, and then conveying the ferrosilicon to a ferrosilicon collecting bin through a conveying device for collecting;
s6, extracting part of washing liquid from the ferrosilicon filtering washer, returning the part of washing liquid to the waste material reactor to participate in reaction, recycling part of washing water, and discharging redundant water to other procedures for comprehensive utilization.
Preferably, in the step S1, during the process of adding the mixed waste into the waste receiving bin, the bin body of the waste receiving bin is replaced by "nitrogen-air" through a pipeline and a valve control.
Preferably, the waste reactor in the step S2 is provided with positive, negative and safe water seals to ensure safe operation of the reactor.
Preferably, the process equipment pipeline in the whole process flow adopts a nitrogen filling mode, so that the system safety is ensured.
Preferably, a pressure sensor and a temperature sensor are arranged in the waste material reactor in the step S2.
(III) advantageous effects
The invention provides a process for recovering ferrosilicon from waste residues. The method has the following beneficial effects:
the process designed by the invention can screen and detect clean ferrosilicon from waste residues, is safe and pure, can be sold directly, increases the income, can also recover harmful dispersed calcium carbide and generate acetylene gas, and the generated acetylene gas enters an acetylene gas system after being recovered, thereby improving the yield of acetylene production and reducing the cost required by production
FIG. 1 is a schematic view of the process of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
as shown in fig. 1, the embodiment provides a process for recovering ferrosilicon from waste slag, comprising the following steps:
s1, firstly, throwing solid waste powder containing ferrosilicon and calcium carbide into a waste receiving bin, and controlling nitrogen-air replacement of a bin body of the waste receiving bin through a pipeline and a valve in the process of adding mixed waste into the waste receiving bin so as to ensure the safety of feeding;
s2, continuously conveying the waste in the waste receiving bin into a waste reactor through a waste conveyor, wherein the waste reactor is provided with a positive water seal, a negative water seal and a safety water seal to ensure that the reactor runs safely, and a pressure sensor and a temperature sensor are arranged in the waste reactor to ensure that the pressure and the temperature of the reaction can be monitored at any time;
s3, introducing water into the waste reactor to react with calcium carbide in the solid waste powder, wherein the water reacts with the calcium carbide to generate acetylene gas, and the generated acetylene gas is merged into a production network through an exhaust pipeline;
s4, after the calcium carbide in the waste material reactor is consumed by reaction, discharging the slurry formed by mixing the residual ferrosilicon and the reaction liquid through a discharge port of the reactor, and feeding the slurry into a ferrosilicon filtering washer;
s5, introducing water into the inner end of the filtering washer to filter and wash the slurry containing the ferrosilicon, separating and simultaneously washing the ferrosilicon from the slurry, and then conveying the ferrosilicon to a ferrosilicon collecting bin through a conveying device for collecting;
s6, extracting part of washing liquid from the ferrosilicon filtering washer, returning the part of washing liquid to the waste material reactor to participate in reaction, recycling part of washing water, and discharging redundant water to other procedures for comprehensive utilization so as to save energy.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A process for recovering ferrosilicon from waste residue is characterized in that: the method comprises the following steps:
s1, firstly, putting solid waste powder containing ferrosilicon and calcium carbide into a waste receiving bin;
s2, continuously conveying the waste in the waste receiving bin into a waste reactor through a waste conveyor;
s3, introducing water into the waste reactor to react with calcium carbide in the solid waste powder, wherein the water reacts with the calcium carbide to generate acetylene gas, and the generated acetylene gas is merged into a production network through an exhaust pipeline;
s4, after the calcium carbide in the waste material reactor is consumed by reaction, discharging the slurry formed by mixing the residual ferrosilicon and the reaction liquid through a discharge port of the reactor, and feeding the slurry into a ferrosilicon filtering washer;
s5, introducing water into the inner end of the filtering washer to filter and wash the slurry containing the ferrosilicon, separating and simultaneously washing the ferrosilicon from the slurry, and then conveying the ferrosilicon to a ferrosilicon collecting bin through a conveying device for collecting;
s6, extracting part of washing liquid from the ferrosilicon filtering washer, returning the part of washing liquid to the waste material reactor to participate in reaction, recycling part of washing water, and discharging redundant water to other procedures for comprehensive utilization.
2. The process of claim 1, wherein the iron ore is recovered from the waste residue by the following steps: in the step S1, in the process of adding the mixed waste into the waste receiving bin, the bin body of the waste receiving bin is replaced by nitrogen-air under the control of a pipeline and a valve.
3. The process of claim 1, wherein the iron ore is recovered from the waste residue by the following steps: and the waste material reactor in the step S2 is provided with positive, negative and safe water seals to ensure the safe operation of the reactor.
4. The process of claim 1, wherein the iron ore is recovered from the waste residue by the following steps: the process equipment pipeline in the whole process flow adopts a nitrogen filling mode, so that the system safety is ensured.
5. The process of claim 1, wherein the iron ore is recovered from the waste residue by the following steps: a pressure sensor and a temperature sensor are arranged in the waste material reactor in the step S2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010790268.5A CN111922045A (en) | 2020-08-07 | 2020-08-07 | Process for recovering ferrosilicon from waste residues |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010790268.5A CN111922045A (en) | 2020-08-07 | 2020-08-07 | Process for recovering ferrosilicon from waste residues |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111922045A true CN111922045A (en) | 2020-11-13 |
Family
ID=73307575
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010790268.5A Pending CN111922045A (en) | 2020-08-07 | 2020-08-07 | Process for recovering ferrosilicon from waste residues |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111922045A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115889399A (en) * | 2022-11-26 | 2023-04-04 | 安徽华塑股份有限公司 | Carbide slag recycling equipment |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD229147A1 (en) * | 1984-11-14 | 1985-10-30 | Maschf & Eisengiesserei Veb | AZETYLENE ELEMENT DEVELOPER FOR GASIFICATING CALCIUM CARBIDE WITH HIGH FERROSILICLE SHARE |
| US20070084306A1 (en) * | 2005-10-17 | 2007-04-19 | Jones Jeremy A | Composition for reducing steelmaking slag |
| CN201545792U (en) * | 2008-09-24 | 2010-08-11 | 宜宾天原集团股份有限公司 | Safe separation and recovery unit for acetylene and carbide slag in dry acetylene generator |
| CN204644294U (en) * | 2015-05-22 | 2015-09-16 | 田耀武 | Acetylene gas and ferrosilicon system is reclaimed in wet method carbide-feed generator slag slurry |
| CN204874417U (en) * | 2015-07-31 | 2015-12-16 | 广西德陆科技有限公司 | Device is used multipurposely to full -automatic row of sediment of acetylene gas generator |
| CN204918697U (en) * | 2015-09-02 | 2015-12-30 | 西安利时通机电科技有限公司 | Dry process acetylene carbide slag ferrosilicon recovery plant |
| CN205011710U (en) * | 2015-08-03 | 2016-02-03 | 宜宾海丰和锐有限公司 | Carbide slag thick liquid separator indisputable with silicon in wet process system acetylene |
| CN205341026U (en) * | 2016-01-06 | 2016-06-29 | 深圳市中矿海纳矿业有限公司 | Carbide slag slurry particulate ferrosilicon and incomplete soot particle recovery unit |
| CN209815990U (en) * | 2019-04-18 | 2019-12-20 | 杨玉亭 | Dry acetylene sludge acetylene gas and silicon iron recycling device |
-
2020
- 2020-08-07 CN CN202010790268.5A patent/CN111922045A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD229147A1 (en) * | 1984-11-14 | 1985-10-30 | Maschf & Eisengiesserei Veb | AZETYLENE ELEMENT DEVELOPER FOR GASIFICATING CALCIUM CARBIDE WITH HIGH FERROSILICLE SHARE |
| US20070084306A1 (en) * | 2005-10-17 | 2007-04-19 | Jones Jeremy A | Composition for reducing steelmaking slag |
| CN201545792U (en) * | 2008-09-24 | 2010-08-11 | 宜宾天原集团股份有限公司 | Safe separation and recovery unit for acetylene and carbide slag in dry acetylene generator |
| CN204644294U (en) * | 2015-05-22 | 2015-09-16 | 田耀武 | Acetylene gas and ferrosilicon system is reclaimed in wet method carbide-feed generator slag slurry |
| CN204874417U (en) * | 2015-07-31 | 2015-12-16 | 广西德陆科技有限公司 | Device is used multipurposely to full -automatic row of sediment of acetylene gas generator |
| CN205011710U (en) * | 2015-08-03 | 2016-02-03 | 宜宾海丰和锐有限公司 | Carbide slag thick liquid separator indisputable with silicon in wet process system acetylene |
| CN204918697U (en) * | 2015-09-02 | 2015-12-30 | 西安利时通机电科技有限公司 | Dry process acetylene carbide slag ferrosilicon recovery plant |
| CN205341026U (en) * | 2016-01-06 | 2016-06-29 | 深圳市中矿海纳矿业有限公司 | Carbide slag slurry particulate ferrosilicon and incomplete soot particle recovery unit |
| CN209815990U (en) * | 2019-04-18 | 2019-12-20 | 杨玉亭 | Dry acetylene sludge acetylene gas and silicon iron recycling device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115889399A (en) * | 2022-11-26 | 2023-04-04 | 安徽华塑股份有限公司 | Carbide slag recycling equipment |
| CN115889399B (en) * | 2022-11-26 | 2024-05-17 | 安徽华塑股份有限公司 | Carbide slag recycle equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102534220B (en) | Closed circulating and recycling method of waste lead-acid accumulator | |
| CN107586956A (en) | A kind of method of efficiently concentrating rhodium in organic rhodium catalyst waste liquid from failure | |
| CN103949459B (en) | A kind of electrolytic aluminium breeze of recycling produces aluminium electrolyte and the method reclaiming carbon | |
| CN110976481B (en) | Copper-containing hazardous waste treatment process | |
| CN109136564A (en) | A kind of processing method of the carbon containing waste residue of electrolytic aluminium | |
| CN104988314A (en) | Method of recovering platinum group metals based on copper capture | |
| US20160023896A1 (en) | Method for Producing Hydrogen and/or Other Gases from Steel Plant Wastes and Waste Heat | |
| KR101493965B1 (en) | Process for recovering iron and zinc from iron and zinc-bearing waste | |
| CN112122307A (en) | Dangerous waste plasma melting treatment system | |
| CN110093471A (en) | A kind of efficient low-consume red mud method of comprehensive utilization | |
| CN111922045A (en) | Process for recovering ferrosilicon from waste residues | |
| CN111826526A (en) | Method and device for environment-friendly recovery of precious metals in waste circuit board through combined smelting of waste circuit board, copper concentrate and desulfurized gypsum | |
| CN103205772B (en) | Method for producing electrolytic manganese dioxide | |
| CN214270947U (en) | System for harmless, resourceful processing of aluminium industry waste cathode carbon piece | |
| CN112058868B (en) | Solid waste residue processing apparatus in electrolytic magnesium production | |
| CN105200237A (en) | Process method for regenerating and recycling aluminum scrap resources | |
| CN117286343A (en) | Method for recycling and preparing high-purity silver from silver-containing waste | |
| Mordogan et al. | Caustic soda leach of electric arc furnace dust | |
| CN116814974A (en) | Method for recycling platinum group metals in automobile waste catalysts by taking ferronickel tailings as flux through pyrogenic process | |
| CN111454008A (en) | Zero-landfill technical method for waste incineration fly ash | |
| CN108383142B (en) | Method for producing alumina by recycling regenerated aluminum ash | |
| CN110860314A (en) | Carbon catalytic oxidant and method for treating carbon-containing waste residue of electrolytic aluminum | |
| CN114888043A (en) | Method and device for treating secondary aluminum ash | |
| CN109439912B (en) | One-step comprehensive recovery method for neodymium iron boron waste acid leaching residue through flash reduction | |
| CN112538557A (en) | System and method for harmless and resource treatment of aluminum industry waste cathode carbon blocks |
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 | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20201113 |
|
| RJ01 | Rejection of invention patent application after publication |