CN115125023A - Coke modification catalyst and spraying method - Google Patents
Coke modification catalyst and spraying method Download PDFInfo
- Publication number
- CN115125023A CN115125023A CN202210717186.7A CN202210717186A CN115125023A CN 115125023 A CN115125023 A CN 115125023A CN 202210717186 A CN202210717186 A CN 202210717186A CN 115125023 A CN115125023 A CN 115125023A
- Authority
- CN
- China
- Prior art keywords
- coke
- catalyst
- agent
- modifying
- mixture
- 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
- 239000000571 coke Substances 0.000 title claims abstract description 100
- 239000003054 catalyst Substances 0.000 title claims abstract description 43
- 238000005507 spraying Methods 0.000 title claims description 18
- 230000004048 modification Effects 0.000 title abstract description 15
- 238000012986 modification Methods 0.000 title abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 238000010791 quenching Methods 0.000 claims abstract description 18
- 230000000171 quenching effect Effects 0.000 claims abstract description 18
- 238000006243 chemical reaction Methods 0.000 claims abstract description 11
- 239000003463 adsorbent Substances 0.000 claims abstract description 7
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 7
- 239000008139 complexing agent Substances 0.000 claims abstract description 7
- 239000006184 cosolvent Substances 0.000 claims abstract description 7
- 239000003607 modifier Substances 0.000 claims abstract description 7
- 239000011148 porous material Substances 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims abstract description 7
- 230000015556 catabolic process Effects 0.000 claims abstract description 6
- 238000006731 degradation reaction Methods 0.000 claims abstract description 6
- 230000003197 catalytic effect Effects 0.000 claims abstract description 4
- 238000001035 drying Methods 0.000 claims abstract description 4
- 238000000227 grinding Methods 0.000 claims abstract description 4
- 238000012216 screening Methods 0.000 claims abstract description 4
- 238000005303 weighing Methods 0.000 claims abstract description 4
- 230000018044 dehydration Effects 0.000 claims abstract description 3
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 3
- 239000000203 mixture Substances 0.000 claims description 10
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 claims description 6
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 claims description 6
- 239000003814 drug Substances 0.000 claims description 6
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 3
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 3
- 229920000877 Melamine resin Polymers 0.000 claims description 3
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 3
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 3
- 235000011037 adipic acid Nutrition 0.000 claims description 3
- 239000001361 adipic acid Substances 0.000 claims description 3
- 239000000783 alginic acid Substances 0.000 claims description 3
- 235000010443 alginic acid Nutrition 0.000 claims description 3
- 229920000615 alginic acid Polymers 0.000 claims description 3
- 229960001126 alginic acid Drugs 0.000 claims description 3
- 150000004781 alginic acids Chemical class 0.000 claims description 3
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims description 3
- 239000004327 boric acid Substances 0.000 claims description 3
- 229910052796 boron Inorganic materials 0.000 claims description 3
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 3
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 3
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 3
- 239000007822 coupling agent Substances 0.000 claims description 3
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 3
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 3
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 3
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims description 3
- 239000004816 latex Substances 0.000 claims description 3
- 229920000126 latex Polymers 0.000 claims description 3
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 claims description 3
- VLAPMBHFAWRUQP-UHFFFAOYSA-L molybdic acid Chemical compound O[Mo](O)(=O)=O VLAPMBHFAWRUQP-UHFFFAOYSA-L 0.000 claims description 3
- 229920002401 polyacrylamide Polymers 0.000 claims description 3
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 239000013008 thixotropic agent Substances 0.000 claims description 3
- 239000002981 blocking agent Substances 0.000 claims description 2
- 230000000593 degrading effect Effects 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 12
- 230000008901 benefit Effects 0.000 abstract description 8
- 238000005299 abrasion Methods 0.000 abstract description 4
- 230000009257 reactivity Effects 0.000 abstract description 4
- 239000000428 dust Substances 0.000 abstract description 3
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 239000003245 coal Substances 0.000 description 16
- 238000004939 coking Methods 0.000 description 15
- 230000000694 effects Effects 0.000 description 7
- 230000008569 process Effects 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000012528 membrane Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000002407 reforming Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
- C10B57/04—Other carbonising or coking processes; Features of destructive distillation processes in general using charges of special composition
- C10B57/06—Other carbonising or coking processes; Features of destructive distillation processes in general using charges of special composition containing additives
-
- 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
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/584—Recycling of catalysts
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Coke Industry (AREA)
Abstract
The invention discloses a coke modification catalyst, which comprises the following components in percentage by mass: 30-55% of degradation adsorbent, 10-25% of tackifying cosolvent, 20-45% of pore closing agent, 15-55% of complexing agent and 1-5% of surface modifier, the components are uniformly mixed in a catalytic stirring tank according to the mass percentage for reaction to prepare the coke modifying catalyst, and then the coke modifying catalyst is prepared by grinding, screening, centrifugal dehydration and drying, weighing and bagging. Compared with the prior art, the invention has the advantages that: the coke modification catalyst can improve the strength CSR after coke reaction, reduce the coke reactivity CRI and simultaneously improve the cold crushing strength M of the coke 40 Decrease the abrasion resistance M 10 The method not only can save the coke quenching water resource, but also can reduce the dust pollution and the energy consumption for producing coke, and has remarkable economic benefit and social environmental protection benefit.
Description
Technical Field
The invention relates to the technical field of coking, in particular to a coke modification catalyst and a spraying method.
Background
Since this century, China is the first place in world steel capacity in successive years, in 2021, the steel yield in China reaches 13.37 hundred million tons, and the steel working procedure needs to consume a large amount of metallurgical coke to provide heat energy. Meanwhile, the resource structure of China is also considered, although the coal resources of China are rich, the high-quality coking coal resources required for coking are extremely limited, strong caking coal is more scarce, weak caking coal occupies a large part, and non-caking coal which is not suitable for coking also occupies a large proportion, so that China faces the current situation of coke neck before increasing coke requirements and increasingly severe coke quality requirements, the current situations of yield and quality are solved, the bottleneck problem of the coke coking coal resources is deeply researched, the yield of the coke of China reaches 4.64 tons in 2021 year, a part of imported coke and coking coal is not included, the deep utilization and development of the coking coal are researched, and the improvement of the quality of the coke becomes a technical hot subject.
At present, coking workers adopt technical means of improving the proportion of main coking coal and fat coal, improving coal blending coking, tamping coking, coal moisture control, dry quenching and the like to improve the coke quality, but if the proportion of the main coking coal and the fat coal is improved, the coke performance can be improved, but the cost is greatly increased; if tamping coking, coal moisture control and dry quenching processes are adopted, the processes are increased, the equipment is added, the construction period is long, the economic investment of enterprises is huge undoubtedly, and the application is limited.
In recent years, the Coke upgrading technology is deeply researched by the majority of coking workers, and particularly, the Coke thermal property (reactive Coke Reaction Index, CRI and post-Reaction Strength Coke Strength after Reaction, CSR) is improved by adopting a negative catalyst to obtain a good effect, but the process is high in cost and complex and is not beneficial to popularization and application.
In view of the above, the present invention provides a coke modification catalyst and a spraying method thereof, aiming at the problems of poor coke quality and the current production situation of a coke plant, the existing production process is not changed, the coke modification catalyst is applied to spray the coke, so that the post-reaction strength CSR of the coke can be improved, the reactivity CRI of the coke can be reduced, and the cold crushing strength M of the coke can be improved 40 Decrease the abrasion resistance M 10 The method not only can save a large amount of coke quenching water resources, but also can reduce dust pollution and energy consumption for producing coke, and has remarkable economic benefit and social environmental protection benefit.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the technical defects, and provide a coke reforming catalyst, which comprises the following components in percentage by mass: 30-55% of degradation adsorbent, 10-25% of tackifying cosolvent, 20-45% of pore closing agent, 15-55% of complexing agent and 1-5% of surface modifier, the components are uniformly mixed in a catalytic stirring tank according to the mass percentage for reaction to prepare the coke modifying catalyst, and then the coke modifying catalyst is prepared by grinding, screening, centrifugal dehydration and drying, weighing and bagging.
Further, the degradation adsorbent is a mixture of melamine and refined adipic acid.
Furthermore, the viscosity-increasing cosolvent is a mixture of any two of alginic acid, a thixotropic agent and polyvinyl alcohol.
Further, the pore blocking agent is a mixture of any two of polyacrylamide, redispersible latex powder, hydroxypropyl methylcellulose and carboxymethyl cellulose.
Further, the complexing agent is any one of boron trioxide, instant boron, boric acid and molybdic acid.
Further, the surface modifier is any one of a silane coupling agent and a titanate coupling agent.
A method for spraying coke modifying catalyst includes adding coke modifying catalyst into water at 20-100 deg.C or domestic water to prepare solution of coke modifying catalyst, and spraying coke, wherein the concentration of coke modifying catalyst in the solution is 0.6-18%.
Compared with the prior art, the invention has the advantages that: the coke modification catalyst can form a membrane effect after being sprayed, effectively prevents coke from contacting with water, enables red coke to be cooled at a low temperature under the condition of the membrane effect, avoids strong shrinkage of the coke after water quenching, reduces the generation of cracks in the coke, improves the cold performance of the coke, improves the hot performance of the coke, reduces the water content of the coke, and reduces the discharge amount of harmful steam in the conventional coke quenching process. By using the coke modifying catalyst, the strength CSR of the coke after reaction can be improved, the reactivity CRI of the coke can be reduced, and the cold crushing strength M of the coke can be improved 40 Decrease the abrasion resistance M 10 The method not only can save coke quenching water resources, but also can reduce dust pollution and coke energy consumption, and has remarkable economic benefit and social environmental protection benefit.
Detailed Description
In the description of the present invention, the meaning of "plural" is two or more unless otherwise specified. Furthermore, the term "comprises" and any variations thereof is intended to cover non-exclusive inclusions.
A coke reforming catalyst comprises the following components in percentage by mass: 30-55% of degradation adsorbent, 10-25% of tackifying cosolvent, 20-45% of pore sealing agent, 15-35% of complexing agent and 1-5% of surface modifier.
The degradation adsorbent is a mixture of melamine and refined adipic acid.
The viscosity-increasing cosolvent is a mixture of any two of alginic acid, a thixotropic agent and polyvinyl alcohol.
The pore closing agent is a mixture of any two of polyacrylamide, redispersible latex powder, hydroxypropyl methyl cellulose and carboxymethyl cellulose.
The complexing agent is any one of boron trioxide, instant boron, boric acid and molybdic acid.
The surface modifier is any one of silane coupling agent and titanate coupling agent.
The coke modification catalyst is prepared by uniformly mixing the components in a catalytic stirring tank according to the mass percentage of the components for reaction, grinding, screening, centrifugally dewatering and drying the mixture to obtain the coke modification catalyst, and then weighing and bagging the coke modification catalyst.
A method for spraying coke modifying catalyst includes adding coke modifying catalyst into water at 20-100 deg.C or domestic water to prepare solution of the catalyst, regulating the concentration of the catalyst in the solution to 0.6-18%, and spraying coke.
The first embodiment is as follows: in a coking plant for wet quenching, a coke modification catalyst is added according to 1% of the capacity of quenching water in a quenching tank, high-pressure air is used for stirring to ensure that a medicament is completely dissolved to form a medicament solution of the quenching water, the medicament solution is sprayed onto coke by a quenching tower for quenching, the spraying time is controlled to be 2-3min, the coke sprayed by the medicament solution can form a membrane effect to effectively prevent the contact with water, so that the red coke is cooled at the reduced temperature under the condition of the membrane effect, the strong shrinkage of the quenched coke after water quenching is avoided, the generation of cracks in the coke is reduced, the cold performance of the coke can be improved, the hot performance of the coke can be improved, the water content of the coke can be reduced, the harmful steam discharge amount in the conventional quenching process can be reduced, and the effect of a dry quenching process can be achieved by adopting water quenching.
Example two: preparing a coke modification catalyst agent solution according to the concentration proportion of 10 percent in a fixed stirring tank, adding the agent while stirring, pumping the solution into a spraying tank after the solution is completely dissolved, pressurizing by using a booster pump, conveying the solution to a spraying point through a pipeline, starting a spraying pump to adjust the pressure, spraying the solution through a nozzle, and controlling the spraying amount to be between 1 and 3 percent.
The following table shows the coke index comparison before and after spraying coke upgrading catalyst (according to the national standard GB/T4000-1996):
it can be seen that the crushing strength M of the coke 40 、M 25 All have certain improvement, the abrasion resistance of the coke M 10 The reactivity of the coke is reduced, and the strength of the coke after reaction is greatly improved, so that the coke modification catalyst has good effects on the cold property and the thermal property of the coke.
The following table shows the comparison of coke production indexes before and after spraying a coke modifying catalyst applied to a certain blast furnace:
it can be seen that the daily average yield is improved, the yield is increased by 1.4 percent and the utilization coefficient is improved by 0.05t/m by comparing the production indexes of the coke before and after the spraying treatment in the actual application of the blast furnace 3 The coke ratio is reduced by 14kg/t. iron, which is equivalent to 3.67 percent, and the coal ratio and the comprehensive fuel ratio are improved to a certain degree.
The present invention and the embodiments thereof have been described above, and the description is not restrictive, and the embodiments shown in the detailed description are only a part of the embodiments of the present invention, not all embodiments, and the actual configuration is not limited thereto. In summary, those skilled in the art should be able to conceive of the present invention without creative design of the similar structural modes and embodiments without departing from the spirit of the present invention, and all such modifications should fall within the protection scope of the present invention.
Claims (7)
1. The coke upgrading catalyst is characterized by comprising the following components in percentage by mass: 30-55% of degradation adsorbent, 10-25% of tackifying cosolvent, 20-45% of pore closing agent, 15-55% of complexing agent and 1-5% of surface modifier, the components are uniformly mixed in a catalytic stirring tank according to the mass percentage for reaction to prepare the coke modifying catalyst, and then the coke modifying catalyst is prepared by grinding, screening, centrifugal dehydration and drying, weighing and bagging.
2. The coke upgrading catalyst of claim 1, wherein the degrading adsorbent is a mixture of melamine and purified adipic acid.
3. The coke upgrading catalyst of claim 1, wherein the viscosity increasing cosolvent is a mixture of any two of alginic acid, a thixotropic agent, and polyvinyl alcohol.
4. The coke upgrading catalyst of claim 1, wherein the pore blocking agent is a mixture of any two of polyacrylamide, redispersible latex powder, hydroxypropyl methylcellulose and carboxymethyl cellulose.
5. The coke upgrading catalyst of claim 1, wherein the complexing agent is any one of boron trioxide, fast dissolving boron, boric acid, and molybdic acid.
6. The coke upgrading catalyst of claim 1, wherein the surface modifier is any one of a silane coupling agent and a titanate coupling agent.
7. A spraying method of a coke modifying catalyst is characterized in that a coke modifying catalyst is added into quenching water or domestic water with the water temperature of 20-100 ℃ to prepare a medicament solution, wherein the concentration of the coke modifying catalyst in the medicament solution is 0.6-18%, and then the coke is sprayed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210717186.7A CN115125023A (en) | 2022-06-23 | 2022-06-23 | Coke modification catalyst and spraying method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210717186.7A CN115125023A (en) | 2022-06-23 | 2022-06-23 | Coke modification catalyst and spraying method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115125023A true CN115125023A (en) | 2022-09-30 |
Family
ID=83379792
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210717186.7A Pending CN115125023A (en) | 2022-06-23 | 2022-06-23 | Coke modification catalyst and spraying method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115125023A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109880645A (en) * | 2019-04-12 | 2019-06-14 | 重庆路牛科技有限责任公司 | Coke upgrading synergist and its preparation and application |
-
2022
- 2022-06-23 CN CN202210717186.7A patent/CN115125023A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109880645A (en) * | 2019-04-12 | 2019-06-14 | 重庆路牛科技有限责任公司 | Coke upgrading synergist and its preparation and application |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105542859B (en) | Technology for recycling biomass and producing high-quality fuel gas by using waste heat of blast furnace slag | |
| CN110436946A (en) | A kind of acidproof spray paint for hot-blast stove vault high temperature position | |
| CN111196713A (en) | Method for preparing high-strength support semi-vitrified ceramsite by using low-siliceous red mud raw material | |
| CN112028031A (en) | Method for preparing sodium sulfide by melting reduction of industrial sodium sulfate | |
| CN110607184A (en) | Method for improving cold strength of coke | |
| CN114774599A (en) | Method for blowing biomass hydrogen-rich micro powder into blast furnace | |
| CN102807624A (en) | Preparation technology of hydroxypropyl methylcellulose ether (HPMC) | |
| CN110093467A (en) | A kind of preparation method of iron coke | |
| CN101531939A (en) | Coke deterioration inhibitor and preparation method thereof | |
| CN111057807B (en) | Smelting method of ultralow-silicon low-sulfur qualified pig iron | |
| CN115125023A (en) | Coke modification catalyst and spraying method | |
| CN111809006B (en) | Method for refining size of free magnesium oxide in steel slag of ladle furnace | |
| CN103896543B (en) | Baking-free ceramicite taking brown coal germanium tailings as primary raw material and preparation method thereof | |
| CN105197972A (en) | Silicon removal method of low-grade bauxite | |
| CN104099152B (en) | The novel process that a kind of brown coal drying shaped coal or semicoke passivation are refined | |
| CN112359231B (en) | Method for extracting vanadium by directly calcifying hot vanadium slag | |
| CN104232888A (en) | Method for preparing cooled agglomerated pellets by using dry method electric fly ash of converter gas | |
| CN108034809B (en) | Sintering method of laterite-nickel ore | |
| CN102828053B (en) | Method for smelting magnesium metal with rare earth waste serving as mineralizing agent | |
| CN107557094B (en) | Briquette binder and its production method | |
| CN105602621B (en) | Technology for recycling biomass and producing high-quality fuel gas by using waste heat of steel slag | |
| CN102757806B (en) | A kind of low-temperature carbonization method of direct heating formed coke | |
| CN104293863A (en) | Pre-treatment method for promoting high concentration starch to liquefy | |
| CN111304435B (en) | Pellet energy-saving and emission-reducing method for activating hard-to-burn iron ore through mechanical and chemical coupling | |
| CN102585956B (en) | Briquette and preparation method thereof |
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: 20220930 |
|
| RJ01 | Rejection of invention patent application after publication |