CN110669925B - Alkaline bentonite for pellets - Google Patents
Alkaline bentonite for pellets Download PDFInfo
- Publication number
- CN110669925B CN110669925B CN201911053694.4A CN201911053694A CN110669925B CN 110669925 B CN110669925 B CN 110669925B CN 201911053694 A CN201911053694 A CN 201911053694A CN 110669925 B CN110669925 B CN 110669925B
- Authority
- CN
- China
- Prior art keywords
- bentonite
- alkaline
- pellets
- percent
- powder
- 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.)
- Active
Links
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
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
-
- 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
- C22B1/02—Roasting processes
-
- 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
- C22B1/2413—Binding; Briquetting ; Granulating enduration of pellets
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention belongs to the technical field of ironmaking pellets, and provides alkaline bentonite for pellets, which comprises the following raw materials in parts by weight: the alkaline bentonite comprises the following components in percentage by weight: 80 parts of limestone powder and 20 parts of bentonite; the content of main chemical components in the alkaline bentonite is controlled as follows: 45 to 48 percent of CaO, 8 to 11 percent of SiO, less than 5 percent of water and more than 80 percent of granularity (-0.074 mm); the preparation method comprises the following steps: s1: weighing raw materials: selecting a weighing device, and weighing 22 parts by weight of bentonite and 88 parts by weight of limestone raw materials for later use by using the weighing device; s2: pre-crushing: and cutting and crushing the bentonite raw material and the limestone raw material weighed in the step S1 to obtain corresponding crushed materials for later use. The affinity of the alkaline bentonite after the alkaline bentonite for the pellets is processed with the fine iron powder is improved, the stability of pelletizing is facilitated, and the problem that the pelletizing is greatly influenced by the fine iron powder in the production process of alkaline pellets can be solved.
Description
Technical Field
The invention relates to the technical field of ironmaking pellets, in particular to alkaline bentonite for pellets.
Background
The alkaline pellet ore has good reducibility and reflow characteristic, so that the coke ratio (fuel ratio) of the blast furnace is reduced, the productivity of the blast furnace is improved, and the service life of a furnace lining of the blast furnace with the position of a changed reflow zone is prolonged because the position of the reflow zone in the furnace is lower than that of the acid pellet ore. With the increasing importance of the country on the environmental protection, a plurality of areas have been called a blue sky guard station, especially sintering machines of steel enterprises are influenced by policies of production limitation and production stoppage, and at present, many steel enterprises gradually increase the use proportion of alkaline pellets and reduce the proportion of sintered ore. Therefore, the demand for alkaline pellets is increasing.
At present, the basic pellet production mostly uses the mixture of limestone powder, iron concentrate and bentonite as the raw material for producing the basic pellet, and the limestone powder as the main raw material for improving the alkalinity has poor affinity with water, is greatly influenced by the moisture of the iron concentrate during pelletizing, influences the pelletizing performance, has large machine speed fluctuation and is not beneficial to the stability of the subsequent roasting and cooling of the basic pellet. Therefore, there is an urgent need for a novel alkaline additive to reduce the influence of alkaline pellet production on pelletizing.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides alkaline bentonite for pellets.
The invention provides alkaline bentonite for pellets, which comprises the following components in percentage by weight: 80 parts of limestone powder and 20 parts of bentonite;
the content of main chemical components in the alkaline bentonite is controlled as follows: 45 to 48 percent of CaO, 8 to 11 percent of SiO, less than 5 percent of water and more than 80 percent of granularity (-0.074 mm);
the preparation method comprises the following steps:
s1: weighing raw materials: selecting a weighing device, and weighing 22 parts by weight of bentonite and 88 parts by weight of limestone raw materials for later use by using the weighing device;
s2: pre-crushing: cutting and crushing the bentonite raw material and the limestone raw material which are weighed in the step S1 to obtain corresponding crushed materials for later use;
s3: grinding to prepare powder: selecting two grinding devices, and respectively putting the crushed bentonite and crushed limestone weighed in the step S2 into the two grinding devices for research and treatment to obtain bentonite powder and limestone powder;
s4: preparing raw materials: weighing 80 parts by weight of bentonite powder and 20 parts by weight of limestone powder in turn by using the weighing equipment in S1 for later use;
s5: mixing: putting the weighed bentonite powder and limestone powder together in S4, and adding distilled water with the weight of 8-12% of the total weight for preheating, stirring and mixing to obtain alkaline bentonite slurry for later use;
s6: prefabricating and forming: pelletizing the alkaline bentonite slurry in the step S5 to obtain alkaline bentonite green pellets, and drying the alkaline bentonite green pellets for later use;
s7: and (3) roasting and forming: roasting the dried alkaline bentonite green pellets in the S6 in an oxygen atmosphere to obtain alkaline bentonite pellets, crushing the bentonite and limestone raw materials in advance, then finely grinding the crushed raw materials, and effectively reducing the particle size of the raw materials after secondary crushing so that the particle size of the prepared alkaline bentonite for the pellets is lower than-0.074 mm.
Preferably, the content of main chemical components in the alkaline bentonite is controlled as follows: 46 to 47 percent of CaO, 9 to 10 percent of SiO, less than 4.5 percent of water and more than 82 percent of granularity (-0.074mm) by mass, and accurately controls the content of main chemical components in the alkaline bentonite, so that the water content in the alkaline bentonite prepared by the subsequent process is effectively reduced.
Preferably, the content of main chemical components in the alkaline bentonite is controlled as follows: 46.3 to 46.7 percent of CaO, 9.2 to 9.8 percent of SiO9, less than 4.5 percent of moisture and more than 82 percent of granularity (-0.074mm) by mass, and accurately controls the content of main chemical components in the alkaline bentonite, so that the alkaline bentonite prepared in the subsequent process has smaller granularity and more compact and reliable combination.
Preferably, in S1, when the bentonite raw material and the limestone raw material are weighed, the weighing precision is ± 0.01g, in S4, when the bentonite powder and the limestone powder are weighed, the weighing precision is ± 0.001g, and the weighing precision is slightly more than the standard dosage, so that the loss of the raw material in the processing process is fully considered, and the phenomenon of insufficient raw material is avoided.
Preferably, in S2, the crushed bentonite and crushed limestone particles all pass through a screen with 6 meshes, so that the particle sizes of the crushed bentonite and crushed limestone are less than 3.35 mm.
Preferably, in S3, the particles of the bentonite powder and the limestone powder all need to pass through a screen with 325 meshes, so that the particle sizes of the bentonite powder and the limestone powder are both lower than 0.0450 mm.
Preferably, in the step S5, the quality of the added distilled water is controlled to be 9% to 11% of the total weight of the bentonite powder and the limestone powder, and the water addition amount in the slurry is precisely controlled, so that the alkaline bentonite green ball can be dried quickly and efficiently in the next process.
Preferably, in S5, the preheating temperature of the alkaline bentonite slurry is 65 ℃ to 75 ℃, so that the slurry is preheated in the mixing process, heat enters the inside of the alkaline bentonite green pellets, the subsequent process is facilitated to roast and heat, and cracks caused by uneven heating of the alkaline bentonite green pellets are also avoided.
Preferably, in S6, the drying standard of the raw alkaline bentonite balls is that the moisture content is lower than 8%, and the raw alkaline bentonite balls are dried in advance to remove water, so that the moisture content of the raw alkaline bentonite balls can be further rapidly reduced in the roasting process.
Preferably, in S7, when the alkaline bentonite green pellets are calcined, the calcination environment is controlled to be: 1250-1280 ℃, 50-70 KPa and 0.03-0.1 mol/L oxygen concentration, so that the alkaline bentonite green ball is roasted under the conditions of negative pressure, high temperature and high oxygen, and the moisture in the alkaline bentonite green ball is easier to escape.
The alkaline bentonite for the pellets is prepared by mixing and grinding limestone powder and bentonite firstly, the affinity of the alkaline bentonite with fine iron powder is improved, the influence of moisture of the fine iron powder during pelletizing is reduced, the stability of pelletizing and the roasting of green pellets are facilitated, the stability of the subsequent roasting process is solved, and the aim of stable production can be achieved in a pellet production process of a chain grate-rotary kiln;
the alkaline bentonite for pellets provided by the invention is prepared by mixing and grinding limestone powder and bentonite according to a certain proportion, the affinity of the processed alkaline bentonite and iron concentrate powder is improved, the stability of pelletizing is facilitated, the problem that pelletizing is greatly influenced by the iron concentrate powder in the production process of alkaline pellets can be solved, and the aim of stable production of the alkaline pellets in a pellet production process of a chain grate-rotary kiln is fulfilled;
the affinity of the alkaline bentonite after the alkaline bentonite for the pellets is processed with the fine iron powder is improved, the stability of pelletizing is facilitated, and the problem that the pelletizing is greatly influenced by the fine iron powder in the production process of alkaline pellets can be solved.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The present invention will be further illustrated with reference to the following specific examples.
Examples
The alkaline bentonite for the pellets comprises the following components in percentage by weight: 80 parts of limestone powder and 20 parts of bentonite;
the content of main chemical components in the alkaline bentonite is controlled as follows: 45 to 48 percent of CaO, 8 to 11 percent of SiO, less than 5 percent of water and more than 80 percent of granularity (-0.074 mm);
the preparation method comprises the following steps:
s1: weighing raw materials: selecting a weighing device, and weighing 22 parts by weight of bentonite and 88 parts by weight of limestone raw materials for later use by using the weighing device;
s2: pre-crushing: cutting and crushing the bentonite raw material and the limestone raw material weighed in the step S1 to obtain corresponding crushed materials for later use;
s3: grinding to prepare powder: selecting two grinding devices, and respectively putting the crushed bentonite and crushed limestone weighed in the step S2 into the two grinding devices for research and treatment to obtain crushed bentonite and crushed limestone;
s4: preparing raw materials: weighing 80 parts by weight of bentonite powder and 20 parts by weight of limestone powder in turn by using the weighing equipment in the S1 for later use;
s5: mixing: putting the bentonite powder and the limestone powder weighed in the S4 together, adding distilled water with the weight of 8-12% of the total weight for preheating, stirring and mixing to obtain alkaline bentonite slurry for later use;
s6: prefabricating and forming: pelletizing the alkaline bentonite slurry in the S5 to obtain alkaline bentonite green pellets, and drying the alkaline bentonite green pellets for later use;
s7: and (3) roasting and forming: and roasting the dried alkaline bentonite green pellets in the S6 in an oxygen atmosphere to obtain alkaline bentonite pellets, crushing the raw materials of bentonite and limestone in advance, finely grinding the crushed raw materials, and crushing the crushed raw materials for the second time to effectively reduce the particle size of the raw materials, so that the particle size of the prepared alkaline bentonite pellets is lower than-0.074 mm.
In this example, the content of the main chemical components in the alkaline bentonite was controlled: 46 to 47 percent of CaO, 9 to 10 percent of SiO, less than 4.5 percent of water and more than 82 percent of granularity (-0.074mm) by mass, and accurately controls the content of main chemical components in the alkaline bentonite, so that the water content in the alkaline bentonite prepared by the subsequent process is effectively reduced.
In this example, the content of the main chemical components in the alkaline bentonite was controlled: 46.3 to 46.7 percent of CaO, 9.2 to 9.8 percent of SiO9, less than 4.5 percent of moisture and more than 82 percent of granularity (-0.074mm) by mass, and accurately controls the content of main chemical components in the alkaline bentonite, so that the alkaline bentonite prepared in the subsequent process has smaller granularity and more compact and reliable combination.
In this embodiment, in S1, when the bentonite raw material and the limestone raw material are weighed, the weighing precision is ± 0.01g, in S4, when the bentonite powder and the limestone powder are weighed, the weighing precision is ± 0.001g, and the amount of the raw material is slightly more than the standard amount, so that the loss of the raw material in the processing process is fully considered, and the phenomenon of insufficient raw material is avoided.
In this embodiment, in S2, the crushed bentonite and crushed limestone particles must all pass through a screen with 6 meshes, so that the particle sizes of both crushed bentonite and crushed limestone are less than 3.35 mm.
In this embodiment, in S3, the particles of bentonite powder and limestone powder should all pass through a 325 mesh screen, so that the particle sizes of the bentonite powder and limestone powder are both less than 0.0450 mm.
In this embodiment, in S5, the amount of distilled water added is controlled to be 9% to 11% of the total weight of the bentonite powder and the limestone powder, and the amount of distilled water added in the slurry is precisely controlled, so that the alkaline bentonite green pellets can be dried quickly and efficiently in the next step.
In this embodiment, in S5, the preheating temperature of the alkaline bentonite slurry is 65 ℃ to 75 ℃, so that the slurry is preheated in the mixing process, and the heat enters the inside of the alkaline bentonite green pellets, thereby facilitating the baking and heating in the subsequent process, and also avoiding cracks caused by uneven heating of the alkaline bentonite green pellets.
In this embodiment, in S6, the drying standard of the raw alkaline bentonite balls is that the moisture content is lower than 8%, and the raw alkaline bentonite balls are dried in advance to remove water, so that the moisture content of the raw alkaline bentonite balls can be further rapidly reduced in the roasting process.
In this example, in S7, when the alkaline bentonite green pellets are calcined, the calcination environment is controlled to be: 1250-1280 ℃, 50-70 KPa and 0.03-0.1 mol/L oxygen concentration, so that the alkaline bentonite green ball is roasted under the conditions of negative pressure, high temperature and high oxygen, and the moisture in the alkaline bentonite green ball is easier to escape.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. The alkaline bentonite for the pellets is characterized by comprising the following components in percentage by weight: 80 parts of limestone powder and 20 parts of bentonite;
the content of main chemical components in the alkaline bentonite is controlled as follows: 45 to 48 percent of CaO, 8 to 11 percent of SiO, less than 5 percent of water and more than 80 percent of granularity-0.074 mm;
the preparation method comprises the following steps:
s1: weighing raw materials: selecting a weighing device, and weighing 22 parts by weight of bentonite and 88 parts by weight of limestone raw materials for later use by using the weighing device;
s2: pre-crushing: cutting and crushing the bentonite raw material and the limestone raw material which are weighed in the step S1 to obtain corresponding crushed materials for later use;
s3: grinding to prepare powder: selecting two grinding devices, and respectively putting the crushed bentonite and crushed limestone weighed in the step S2 into the two grinding devices for research and treatment to obtain bentonite powder and limestone powder;
s4: preparing raw materials: weighing 80 parts by weight of bentonite powder and 20 parts by weight of limestone powder in turn by using the weighing equipment in S1 for later use;
s5: mixing: putting the weighed bentonite powder and limestone powder together in S4, and adding distilled water with the weight of 8-12% of the total weight for preheating, stirring and mixing to obtain alkaline bentonite slurry for later use;
s6: prefabricating and forming: pelletizing the alkaline bentonite slurry in the step S5 to obtain alkaline bentonite green pellets, and drying the alkaline bentonite green pellets for later use;
s7: and (3) roasting and forming: and (4) roasting the dried alkaline bentonite green pellets in the S6 in an oxygen atmosphere to obtain alkaline bentonite pellets.
2. The alkaline bentonite for pellets as claimed in claim 1, wherein the content of main chemical components in the alkaline bentonite is controlled by: 46 to 47 percent of CaO, 9 to 10 percent of SiO, less than 4.5 percent of water and more than 82 percent of granularity-0.074 mm by mass.
3. The alkaline bentonite for pellets as claimed in claim 1, wherein the content of main chemical components in the alkaline bentonite is controlled by: 46.3 to 46.7 percent of CaO, 9.2 to 9.8 percent of SiO, less than 4.5 percent of water and more than 82 percent of granularity-0.074 mm by mass.
4. The alkaline bentonite for pellets according to claim 1, wherein the bentonite raw material and the limestone raw material are weighed with a precision of ± 0.01g in the S1, and the bentonite powder and the limestone powder are weighed with a precision of ± 0.001g in the S4.
5. The alkaline bentonite for balls as claimed in claim 1, wherein in the step S2, the particles of the crushed bentonite and crushed limestone all have to pass through a 6-mesh screen.
6. The alkaline bentonite for pellets as set forth in claim 1, wherein in said S3, said bentonite powder and said limestone powder particles are all passed through a 325 mesh screen.
7. The alkaline bentonite for pellets as set forth in claim 1, wherein the amount of distilled water added in S5 is controlled to be 9-11% of the total weight of the bentonite powder and the limestone powder.
8. The alkaline bentonite for pellets as claimed in claim 1, wherein the preheating temperature of the alkaline bentonite slurry in the step S5 is 65-75 ℃.
9. The alkaline bentonite for pellets as set forth in claim 1, wherein the drying standard of the raw alkaline bentonite pellets in S6 is less than 8% moisture.
10. The alkaline bentonite for pellets as claimed in claim 1, wherein in the step S7, when the raw pellets of alkaline bentonite are calcined, the calcination environment is controlled as follows: 1250 to 1280 ℃, 50 to 70KPa and the oxygen concentration of 0.03 to 0.1 mol/L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911053694.4A CN110669925B (en) | 2019-10-31 | 2019-10-31 | Alkaline bentonite for pellets |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911053694.4A CN110669925B (en) | 2019-10-31 | 2019-10-31 | Alkaline bentonite for pellets |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110669925A CN110669925A (en) | 2020-01-10 |
| CN110669925B true CN110669925B (en) | 2021-03-23 |
Family
ID=69085405
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911053694.4A Active CN110669925B (en) | 2019-10-31 | 2019-10-31 | Alkaline bentonite for pellets |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110669925B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120103134A1 (en) * | 2008-07-25 | 2012-05-03 | Vale S.A. | Process to produce manganese pellets from non-calcinated manganese ore and agglomerate obtained by this process |
| CN102828022A (en) * | 2012-09-11 | 2012-12-19 | 新兴能源装备股份有限公司 | Production process of pure hematite alkaline pellets |
| CN105039681A (en) * | 2015-08-24 | 2015-11-11 | 山西太钢不锈钢股份有限公司 | Method for manufacturing alkaline magnesium-rich pellet ore |
| CN108823404A (en) * | 2018-06-15 | 2018-11-16 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of iron ore pellets bentonite adhesive formula and preparation method thereof |
| CN110106351A (en) * | 2019-04-19 | 2019-08-09 | 承德信通首承矿业有限责任公司 | A kind of production method of magnesium-rich pellet nodulizing |
-
2019
- 2019-10-31 CN CN201911053694.4A patent/CN110669925B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120103134A1 (en) * | 2008-07-25 | 2012-05-03 | Vale S.A. | Process to produce manganese pellets from non-calcinated manganese ore and agglomerate obtained by this process |
| CN102828022A (en) * | 2012-09-11 | 2012-12-19 | 新兴能源装备股份有限公司 | Production process of pure hematite alkaline pellets |
| CN105039681A (en) * | 2015-08-24 | 2015-11-11 | 山西太钢不锈钢股份有限公司 | Method for manufacturing alkaline magnesium-rich pellet ore |
| CN108823404A (en) * | 2018-06-15 | 2018-11-16 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of iron ore pellets bentonite adhesive formula and preparation method thereof |
| CN110106351A (en) * | 2019-04-19 | 2019-08-09 | 承德信通首承矿业有限责任公司 | A kind of production method of magnesium-rich pellet nodulizing |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110669925A (en) | 2020-01-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109266847B (en) | Preparation method of low-temperature consolidated metallurgical pellets | |
| CN103320607B (en) | A kind of cold-consolidated ball and preparation method thereof | |
| CN1025749C (en) | Method for preparing pellet sintered ore | |
| CN109487074A (en) | A kind of fluxed pellets mine and preparation method thereof with addition of the production of fluorine-containing magnetite concentrate | |
| CN109852788B (en) | Method and device for preparing alkaline pellets by using slaked lime | |
| CN104357657A (en) | Method for preparing oxidized pellets from converter dedusting ash | |
| CN110791645B (en) | Production method of vanadium-titanium alkaline pellet ore | |
| CN110904334A (en) | Preparation method of iron ore pellets | |
| CN110894575A (en) | Composite binder for low-alkalinity magnesium pellets and preparation method and application thereof | |
| CN111468268A (en) | Pellet composite ore grinding system and pellet composite ore grinding method | |
| CN113333770B (en) | Preparation method of powder metallurgy iron powder | |
| CN114763582B (en) | Method for producing magnesium pellets by using oriented silicon steel magnesia waste | |
| CN113957240A (en) | Preparation method of manganese-containing vanadium-titanium magnetite pellet | |
| CN103937965A (en) | Technology for roasting of pellet ore from concentrate powder and precipitator dust | |
| CN109371232A (en) | For reducing the method for pellet expansion rate | |
| CN103114198A (en) | Method for utilizing nickel flash smelting water-quenched slag | |
| CN110669925B (en) | Alkaline bentonite for pellets | |
| CN105063346B (en) | A kind of method of reduction MgO pellet-roasting temperature | |
| CN112813258B (en) | Method for producing alkaline pellets by utilizing neutralized slag and sulfuric acid slag | |
| CN110343796B (en) | Method for reducing iron loss in blast furnace smelting of vanadium titano-magnetite | |
| CN113136486A (en) | Production method and formula of pellets added with low-nickel high-iron nickel ore | |
| CN102268542B (en) | Method for preparing hematite powder pellets | |
| CN110846497B (en) | Binder for magnesium-containing fluxed pellets and preparation method thereof | |
| CN114836616B (en) | Iron ore powder pellet and preparation method thereof | |
| CN115261611B (en) | Production method of magnesia pellet |
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 |
Address after: 068252 Chengde city Hebei town Luan Jin Gou Tun Village along the county of Luanping Province Applicant after: Chengde Xintong Shoucheng Technology Co., Ltd Address before: 068252 Chengde city Hebei town Luan Jin Gou Tun Village along the county of Luanping Province Applicant before: CHENGDE XINTONG SHOUCHENG MINING Co.,Ltd. |
|
| CB02 | Change of applicant information | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information |
Inventor after: Chen Qingheng Inventor after: Li Chengfeng Inventor after: Peng Lian Inventor after: Heng Baoyin Inventor before: Li Chengfeng |
|
| CB03 | Change of inventor or designer information |