CN110592398A - Ferronickel production facility - Google Patents
Ferronickel production facility Download PDFInfo
- Publication number
- CN110592398A CN110592398A CN201911045520.3A CN201911045520A CN110592398A CN 110592398 A CN110592398 A CN 110592398A CN 201911045520 A CN201911045520 A CN 201911045520A CN 110592398 A CN110592398 A CN 110592398A
- Authority
- CN
- China
- Prior art keywords
- equipment
- hot
- ferronickel
- ferronickel production
- electric dust
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
-
- 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
- C22B23/00—Obtaining nickel or cobalt
- C22B23/02—Obtaining nickel or cobalt by dry processes
- C22B23/023—Obtaining nickel or cobalt by dry processes with formation of ferro-nickel or ferro-cobalt
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention provides ferronickel production equipment which comprises at least two ferronickel production lines, wherein each ferronickel production line comprises a submerged arc furnace, a rotary kiln, a hot blast furnace, a drying kiln and desulfurization equipment which are sequentially arranged, electric dust removal equipment is arranged between the drying kiln and the desulfurization equipment, an induced draft fan is arranged between the electric dust removal equipment and the desulfurization equipment, the submerged arc furnace, the rotary kiln, the hot blast furnace, the drying kiln and the desulfurization equipment are sequentially communicated through hot blast pipelines, a communication pipeline for communicating the hot blast pipelines of two adjacent production lines is arranged between the drying kiln and the electric dust removal equipment, a switching valve is arranged on the communication pipeline, and an isolation valve is arranged on the hot blast pipeline between the communication pipeline and the. According to the ferronickel production equipment provided by the invention, different production lines are communicated through pipelines, and corresponding valves are arranged, so that electric precipitation equipment can be overhauled without stopping a furnace through pipeline switching during overhauling, production is not influenced, and the production benefit and the maintenance safety coefficient are improved.
Description
Technical Field
The invention relates to the field of ore smelting, in particular to ferronickel production equipment.
Background
In the production process of ferronickel, a large amount of smoke and dust can be generated in the submerged arc furnace and the rotary kiln, in the process flow of the production process of the ferronickel RKEF, the negative pressure generated by an electric dust removal device and an induced draft fan is utilized to recycle the waste heat and the smoke and dust in the submerged arc furnace and the rotary kiln, wet ore is dried, the smoke and dust are purified, then the wet ore and the purified smoke and dust enter a desulfurization device, and finally the wet ore and the purified smoke and. When the original RKEF ferronickel production process negative pressure environment-friendly equipment needs to be maintained, electric dust removal maintenance can be carried out after the processes of smelting, roasting and drying are stopped and the temperature is reduced, so that a large amount of heat energy and time are wasted, and the energy conservation and consumption reduction of enterprises are not facilitated.
Disclosure of Invention
Aiming at the problems, the invention provides ferronickel production equipment, which can be used for overhauling electric precipitation equipment without blowing out a furnace and basically does not influence the production.
The invention provides ferronickel production equipment which comprises at least two ferronickel production lines, wherein each ferronickel production line comprises a submerged arc furnace, a rotary kiln, a hot blast stove, a drying kiln and desulfurization equipment which are sequentially arranged, electric dust removal equipment is arranged between the drying kiln and the desulfurization equipment, an induced draft fan is arranged between the electric dust removal equipment and the desulfurization equipment, the submerged arc furnace, the rotary kiln, the hot blast stove, the drying kiln and the desulfurization equipment are sequentially communicated through hot blast pipelines, a communication pipeline for communicating the hot blast pipelines of two adjacent production lines is arranged between the drying kiln and the electric dust removal equipment, a switching valve is arranged on the communication pipeline, and an isolation valve is arranged on the hot blast pipeline between the communication pipeline and the electric dust.
Preferably, a cyclone dust collector is arranged between the submerged arc furnace and the rotary kiln.
Preferably, a dust drop chamber is arranged between the cyclone dust collector and the submerged arc furnace.
Preferably, the air inlet of the dust settling chamber is arranged at the lower part, and the air outlet of the dust settling chamber is arranged at the upper part.
Preferably, the switching valve and the isolation valve are both pneumatic switching louver valves.
Preferably, at least two of said ferronickel production lines share one desulphurisation plant.
Preferably, the diameter of the hot air pipeline at the air inlet of the electric dust removal equipment is gradually increased.
Preferably, the air outlet of the electric dust removing equipment is positioned at the upper part of the electric dust removing equipment.
After the technical scheme is adopted, the invention has the following beneficial effects:
according to the ferronickel production equipment provided by the invention, different production lines are communicated through pipelines, and corresponding valve members are arranged, so that electric precipitation equipment can be overhauled without stopping a furnace through pipeline switching during overhauling, production is not influenced, and the production benefit and the maintenance safety coefficient are improved. On the basis, the production system is also provided with the cyclone dust collector and the dust settling chamber, so that the dust removal effect can be further improved, and the flue gas inlet and outlet of the dust settling chamber are characterized by low inlet and high outlet, so that the sedimentation effect can be effectively improved. The hot-blast main of the import of electrostatic precipitator adopts the loudspeaker form of diameter crescent, can reduce flue gas velocity and improve dust removal effect. Different production lines can share one desulfurization device, so that the utilization rate of the device can be improved, and the occupied space of the device can be reduced.
Drawings
The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular description of preferred embodiments of the invention, as illustrated in the accompanying drawings. Like reference numerals refer to like parts throughout the drawings, and the drawings are not intended to be drawn to scale in actual dimensions, emphasis instead being placed upon illustrating the principles of the invention.
FIG. 1 is a schematic plan view of a ferronickel production plant according to a preferred embodiment of the present invention;
FIG. 2 is a flow chart of flue gas treatment of a ferronickel production facility according to a preferred embodiment of the invention;
fig. 3 is a schematic view of the position of the communication pipe according to the preferred embodiment of the present invention.
Reference numerals: 1 submerged arc furnace, 2 rotary kilns, 3 hot blast stoves, 4 drying kilns, 5 sweetener, 6 electric precipitation equipment, 7 draught fans, 81 cyclone, 82 dust falling chambers, 91 hot-blast pipelines, 92 communicating pipelines, 93 switching valves and 94 isolating valves.
Detailed Description
The following detailed description of the present invention is provided in connection with the accompanying drawings and specific embodiments for the purpose of better understanding and enabling those skilled in the art to practice the present invention, which are not intended to limit the present invention.
Referring to fig. 1-3, in the process flow of the production of RKEF ferronickel, the negative pressure generated by the induced draft fan of the electric dust removal device 6 is utilized to recycle the residual heat and smoke dust in the submerged arc furnace 1 and the rotary kiln 2, dry wet ore and purify smoke dust, then enter the desulfurization device, and finally are discharged into the atmosphere. The invention provides ferronickel production equipment, which can not only realize the recycling of high-temperature flue gas in the ferronickel smelting process, but also complete the maintenance without blowing out a furnace when maintaining an electric precipitation device 6. The system comprises at least 2 ferronickel production lines, each ferronickel production line comprises a submerged arc furnace 1, a rotary kiln 2, a hot blast stove 3, a drying kiln 4 and a desulfurization device 5 which are sequentially arranged. The high-temperature flue gas generated by the submerged arc furnace 1 and the rotary kiln 2 contains part of combustible gases such as CO, and the high-temperature flue gas flows into the hot blast stove 3 under the action of negative pressure and can be used as part of fuel of the hot blast stove 3. An electric dust removal device 6 is arranged between the drying kiln 4 and the desulphurization device 5, and the electric dust removal device 6 can further remove mineral dust in the flue gas. The electric precipitation equipment 6 and the desulphurization equipment 5 are communicated with each other by an induced draft fan 7, and the induced draft fan 7 can enable the system to generate negative pressure so as to achieve the purpose of sucking flue gas. Hot stove 1 in ore deposit, rotary kiln 2, hot-blast furnace 3, dry kiln 4, electric dust collecting equipment 6 and sweetener 5 loop through hot-blast main 91 intercommunication be provided with the intercommunication pipeline 92 of the adjacent two sets of production line hot-blast main 91 of intercommunication between dry kiln 4 and the electric dust collecting equipment 6, be provided with switching valve 93 on the intercommunication pipeline 92, be provided with isolating valve 94 on hot-blast main 91 between intercommunication pipeline 92 and electric dust collecting equipment 6. In the production process, the electric dust removing equipment 6 is frequently required to be maintained, but the ore heating furnace 1, the rotary kiln 2, the hot blast furnace 3, the drying kiln 4 and the like are required to be stopped to reduce the temperature for maintenance. In the system, during maintenance, only the isolation valve 94 beside the electric dust removal equipment 6 to be maintained is needed to be closed, so that the flue gas is cut off from entering, then the switching valve 93 on the communication pipeline 92 is opened, and the flue gas of the production line to be maintained enters the electric dust removal equipment 6 of another production line through the communication pipeline 92. Therefore, related equipment on the maintenance line can be maintained without shutdown, and production is not affected basically, so that the influence of maintenance on production is reduced, and the production benefit and the maintenance safety factor are improved.
In the preferred embodiment, be provided with cyclone 81 between hot stove 1 in ore deposit and the rotary kiln 2, hot stove 1 in ore deposit can produce a large amount of high temperature flue gas when producing the smelting nickel ore, and the flue gas of hot stove 1 in ore deposit directly enters into cyclone 81, can improve dust removal effect, and the high temperature flue gas enters into the burning of second hot-blast furnace 3 part after tentatively removing dust, and high temperature flue gas also improves hot-blast furnace 3's efficiency, and cyclone 81 has good dust removal effect, the mine dust in the flue gas that can significantly reduce.
In the preferred embodiment, a dust settling chamber 82 is further arranged between the cyclone dust collector 81 and the submerged arc furnace 1. The dust settling chamber 82 can settle the mineral dust in the flue gas to achieve further dust removal, and then the mineral dust enters the cyclone dust collector 81 for further purification. Further, the air inlet of the dust settling chamber 82 is arranged at the lower part, and the air outlet of the dust settling chamber 82 is arranged at the upper part. Thus, the flue gas enters from the lower part of the dust falling chamber 82 and then flows out from the upper part, so that the heavier mine dust can be deposited at the lower part of the dust falling chamber 82, and the deposition effect of the dust falling chamber 82 can be improved.
In the preferred embodiment, the switching valve 93 and isolation valve 94 are both pneumatically switched louvered valves. The starting switching louver valve has the characteristics of reliable performance, zero sealing leakage, high control precision, high switching speed and good sealing performance of the whole machine, and can be automatically controlled and switched and can also be operated and switched on site by a single machine.
In the preferred embodiment, the ferronickel production lines share a single desulphurisation plant 5. The utilization rate of the equipment can be improved by sharing one desulfurization equipment 5, so that the occupied space of the equipment is reduced.
In preferred embodiment, hot-blast line 91 is in the air intake position diameter crescent of electrostatic precipitator 6, and the hot-blast line 91 of electrostatic precipitator air intake position is the loudspeaker form promptly, and the air intake area crescent to can reduce speed when making the flue gas get into electrostatic precipitator 6, be favorable to electrostatic precipitator 6 to improve dust removal effect, under the suction effect of draught fan 7 in addition, the air intake of the electrostatic precipitator 6 of horn mouth form still forms certain vacuum effect, be similar to the nozzle of jet pump, be favorable to the flue gas to enter into electrostatic precipitator 6.
In a preferred embodiment, the air outlet of the electric dust removing device 6 is located at the upper part of the electric dust removing device 6. The air outlet of the electric dust removing equipment 6 is positioned on the upper part, so that the flue gas can be fully purified by electric dust removal, and the dust removing effect is improved.
In the ferronickel smelting process, the submerged arc furnace and the rotary kiln can generate a large amount of smoke, a large amount of mine dust exists in the smoke, and the electric dust removal equipment can effectively purify the smoke, but the electric dust removal equipment can be maintained only by blowing out the submerged arc furnace, the rotary kiln and the like on a production line during maintenance. This production system still is provided with cyclone and dust fall room, improvement dust removal effect that can be further, and the dust fall room flue gas is imported and exported and is adopted the characteristics of low entering height, can effectively improve and subside the effect. The hot-blast main of the import of electrostatic precipitator adopts the loudspeaker form of diameter crescent, can reduce flue gas velocity and improve dust removal effect. Different production lines can share one desulfurization device, so that the utilization rate of the device can be improved, and the occupied space of the device can be reduced.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. The utility model provides a ferronickel production facility, includes two at least ferronickel production lines, every the ferronickel production line is including hot stove in the ore deposit, rotary kiln, hot-blast furnace, drying kiln and the sweetener that sets gradually, its characterized in that, be provided with electric dust collecting equipment between drying kiln and the sweetener, be provided with the draught fan between electric dust collecting equipment and the sweetener, hot stove in the ore deposit, rotary kiln, hot-blast furnace, drying kiln and sweetener loop through the hot-blast line intercommunication be provided with the intercommunication pipeline that communicates adjacent two sets of production line hot-blast line between drying kiln and the electric dust collecting equipment, be provided with the diverter valve on the road communicating pipe, be provided with the isolating valve on the hot-blast line between intercommunication pipeline.
2. The ferronickel production plant of claim 1 wherein a cyclone is provided between the submerged arc furnace and the rotary kiln.
3. Ferronickel production plant according to claim 2, characterized in that a dust drop chamber is provided between the cyclone and the submerged arc furnace.
4. The ferronickel production plant of claim 3, wherein the air inlet of the dust settling chamber is provided at a lower portion, and the air outlet of the dust settling chamber is provided at an upper portion.
5. The ferronickel production plant of claim 1 wherein the switching valve and isolation valve are both pneumatically switched louvered valves.
6. Ferronickel production plant according to claim 1, characterized in that at least two of said ferronickel production lines share one desulphurizing plant.
7. The ferronickel production plant of claim 1, wherein the diameter of the hot air pipeline is gradually increased at the position of an air inlet of the electric precipitation plant.
8. The ferronickel production plant of claim 1, wherein the air outlet of the electric dust removal equipment is located at an upper portion of the electric dust removal equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911045520.3A CN110592398A (en) | 2019-10-30 | 2019-10-30 | Ferronickel production facility |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911045520.3A CN110592398A (en) | 2019-10-30 | 2019-10-30 | Ferronickel production facility |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110592398A true CN110592398A (en) | 2019-12-20 |
Family
ID=68852130
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911045520.3A Pending CN110592398A (en) | 2019-10-30 | 2019-10-30 | Ferronickel production facility |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110592398A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111672249A (en) * | 2020-06-12 | 2020-09-18 | 安徽国能亿盛环保科技有限公司 | Large-scale airtight submerged arc furnace gas purification device and method |
| CN111688095A (en) * | 2020-06-02 | 2020-09-22 | 天华化工机械及自动化研究设计院有限公司 | Spraying and winding forming production line and production process for pipeline anti-corrosion heat insulation layer heat preservation layer |
| CN113137856A (en) * | 2021-05-12 | 2021-07-20 | 江苏惠然实业有限公司 | A energy-saving drying device of drying kiln for wet ore dehydration |
| WO2022188254A1 (en) * | 2021-03-09 | 2022-09-15 | 广东邦普循环科技有限公司 | Recovery process and system for waste gas and waste heat of kilns |
| CN115301056A (en) * | 2022-08-31 | 2022-11-08 | 阳江翌川金属科技有限公司 | Denitration flue gas interlocking control system and denitration process |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102445085A (en) * | 2010-10-08 | 2012-05-09 | 王全祥 | High-temperature flue gas and dust dry purification and waste heat recovery process for ore furnace |
| CN104131127A (en) * | 2014-07-28 | 2014-11-05 | 四川金广实业（集团）股份有限公司 | RKEF process nickel-iron smelting waste heat utilizing method |
| JP2016099089A (en) * | 2014-11-26 | 2016-05-30 | Ｊｆｅスチール株式会社 | Method for producing raw material for iron production and method for treating ferrous oil-containing sludge |
| CN108411116A (en) * | 2018-05-16 | 2018-08-17 | 金川集团股份有限公司 | A kind of lateritic nickel ore RKEF smelting processes smoke gas comprehensive treatment system and method |
| CN208098851U (en) * | 2017-10-31 | 2018-11-16 | 马鞍山钢铁股份有限公司 | A kind of sintering machine exhausting is responsible for the attachment device into head electric precipitator |
| CN209155534U (en) * | 2018-10-08 | 2019-07-26 | 张家港市锦明环保工程装备有限公司 | A kind of flue gas desulfurization and denitrification exhaust system |
| CN210886172U (en) * | 2019-10-30 | 2020-06-30 | 阳江翌川金属科技有限公司 | Ferronickel production facility |
-
2019
- 2019-10-30 CN CN201911045520.3A patent/CN110592398A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102445085A (en) * | 2010-10-08 | 2012-05-09 | 王全祥 | High-temperature flue gas and dust dry purification and waste heat recovery process for ore furnace |
| CN104131127A (en) * | 2014-07-28 | 2014-11-05 | 四川金广实业（集团）股份有限公司 | RKEF process nickel-iron smelting waste heat utilizing method |
| JP2016099089A (en) * | 2014-11-26 | 2016-05-30 | Ｊｆｅスチール株式会社 | Method for producing raw material for iron production and method for treating ferrous oil-containing sludge |
| CN208098851U (en) * | 2017-10-31 | 2018-11-16 | 马鞍山钢铁股份有限公司 | A kind of sintering machine exhausting is responsible for the attachment device into head electric precipitator |
| CN108411116A (en) * | 2018-05-16 | 2018-08-17 | 金川集团股份有限公司 | A kind of lateritic nickel ore RKEF smelting processes smoke gas comprehensive treatment system and method |
| CN209155534U (en) * | 2018-10-08 | 2019-07-26 | 张家港市锦明环保工程装备有限公司 | A kind of flue gas desulfurization and denitrification exhaust system |
| CN210886172U (en) * | 2019-10-30 | 2020-06-30 | 阳江翌川金属科技有限公司 | Ferronickel production facility |
Non-Patent Citations (1)
| Title |
|---|
| 李倦生等: "《环境工程基础》", 武汉理工大学出版社, pages: 198 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111688095A (en) * | 2020-06-02 | 2020-09-22 | 天华化工机械及自动化研究设计院有限公司 | Spraying and winding forming production line and production process for pipeline anti-corrosion heat insulation layer heat preservation layer |
| CN111672249A (en) * | 2020-06-12 | 2020-09-18 | 安徽国能亿盛环保科技有限公司 | Large-scale airtight submerged arc furnace gas purification device and method |
| WO2022188254A1 (en) * | 2021-03-09 | 2022-09-15 | 广东邦普循环科技有限公司 | Recovery process and system for waste gas and waste heat of kilns |
| CN113137856A (en) * | 2021-05-12 | 2021-07-20 | 江苏惠然实业有限公司 | A energy-saving drying device of drying kiln for wet ore dehydration |
| CN115301056A (en) * | 2022-08-31 | 2022-11-08 | 阳江翌川金属科技有限公司 | Denitration flue gas interlocking control system and denitration process |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110592398A (en) | Ferronickel production facility | |
| CN104034175A (en) | Energy-saving and emission-reducing type sintering process | |
| CN105385461A (en) | Sectionalized air feeding structure and method for coke oven heating | |
| CN210886172U (en) | Ferronickel production facility | |
| CN202096885U (en) | Multistage backheating type low-concentration gas heat reflux catalytic oxidation device | |
| CN104083963A (en) | Deduster heating system and heating method | |
| CN201334468Y (en) | Coal gas purification and recovery system for calcium carbide furnace | |
| CN103480614B (en) | Quick dust removal method for coke oven gas conversion system | |
| CN203518640U (en) | Smoke collection and prevention and dust removal device for AOD smelting furnace and medium frequency smelting furnace | |
| CN202390458U (en) | Coal gas recycling device for blast furnace by dry method dust collecting | |
| CN209147748U (en) | Energy-saving and emission-reducing is sintered cooling system | |
| CN203785468U (en) | Treating system for treating waste gas and smoke dust generated from silicon carbide smelting | |
| CN217438223U (en) | Purification treatment recovery and diffusion system for diffused gas in maintenance of blast furnace top | |
| CN102627414B (en) | Device for realizing waste heat recovery by directly calcining lime through primary high-temperature flue gas of converter | |
| CN212731552U (en) | Portable dust purification device | |
| CN201751402U (en) | Residual-heat utilization device of float glass annealing kiln | |
| CN103961955A (en) | Preheating process of dust remover for filtering combustible dusty gas | |
| CN208687747U (en) | A kind of three Room RTO devices administered for industrial organic exhaust gas | |
| CN204255112U (en) | A kind of flue gas ash removal treating apparatus of electrothermal furnace | |
| CN203269985U (en) | System for recycling shielding gases for bell bright annealing furnaces | |
| CN205055653U (en) | Frequency conversion dust collector based on pneumatic control | |
| CN220479677U (en) | Environment smoke collecting system | |
| CN205090812U (en) | Automatic switching control equipment is handled to flue gas | |
| CN210688197U (en) | Symmetrical full-heat-storage combustion system | |
| CN214764248U (en) | Lime kiln waste gas dust removal device |
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 |