CN115198087B - Method for inhibiting looping of high-silicon magnesium flux pellet rotary kiln - Google Patents
Method for inhibiting looping of high-silicon magnesium flux pellet rotary kiln Download PDFInfo
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- CN115198087B CN115198087B CN202210718638.3A CN202210718638A CN115198087B CN 115198087 B CN115198087 B CN 115198087B CN 202210718638 A CN202210718638 A CN 202210718638A CN 115198087 B CN115198087 B CN 115198087B
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- 239000008188 pellet Substances 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 34
- 230000004907 flux Effects 0.000 title claims abstract description 22
- 230000002401 inhibitory effect Effects 0.000 title claims abstract description 16
- 229910052749 magnesium Inorganic materials 0.000 title claims description 25
- 239000011777 magnesium Substances 0.000 title claims description 25
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 title claims description 22
- 229910052710 silicon Inorganic materials 0.000 title claims description 16
- 239000010703 silicon Substances 0.000 title claims description 16
- 239000000843 powder Substances 0.000 claims abstract description 41
- 239000007791 liquid phase Substances 0.000 claims abstract description 19
- MKPXGEVFQSIKGE-UHFFFAOYSA-N [Mg].[Si] Chemical compound [Mg].[Si] MKPXGEVFQSIKGE-UHFFFAOYSA-N 0.000 claims abstract description 17
- 230000008569 process Effects 0.000 claims abstract description 15
- 229910004298 SiO 2 Inorganic materials 0.000 claims abstract description 14
- 239000002994 raw material Substances 0.000 claims abstract description 11
- 230000001276 controlling effect Effects 0.000 claims abstract description 8
- 239000000203 mixture Substances 0.000 claims abstract description 7
- 238000002360 preparation method Methods 0.000 claims abstract description 5
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims abstract description 4
- 230000001105 regulatory effect Effects 0.000 claims abstract description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 7
- 229910052681 coesite Inorganic materials 0.000 claims description 5
- 229910052906 cristobalite Inorganic materials 0.000 claims description 5
- 229910052682 stishovite Inorganic materials 0.000 claims description 5
- 229910052905 tridymite Inorganic materials 0.000 claims description 5
- 230000006399 behavior Effects 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims 2
- 235000012239 silicon dioxide Nutrition 0.000 claims 2
- 238000007363 ring formation reaction Methods 0.000 abstract description 9
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 18
- 238000004519 manufacturing process Methods 0.000 description 15
- 239000000395 magnesium oxide Substances 0.000 description 9
- 230000006835 compression Effects 0.000 description 8
- 238000007906 compression Methods 0.000 description 8
- 230000008901 benefit Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000012071 phase Substances 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 238000012827 research and development Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910000861 Mg alloy Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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- 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
- C22B1/16—Sintering; Agglomerating
- C22B1/216—Sintering; Agglomerating in rotary furnaces
-
- 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
-
- 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
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- 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)
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- Mechanical Engineering (AREA)
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- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention belongs to the technical field of flux pellet preparation, and discloses a method for inhibiting looping of a high silicon magnesium flux pellet rotary kiln, which comprises the steps of preparing MgO, siO with different alkalinity 2 Powder with the content is prepared by briquetting and roasting; respectively adding ash with different mass fractions into the powder, and briquetting and roasting; after the briquettes are cooled, respectively processing certain alkalinity, mgO and SiO 2 FeO-SiO content 2 ‑CaO‑MgO‑Al 2 O 3 Performing system analysis on the generation rule of the liquid phase under the five-membered system; according to the analysis result, regulating and controlling the composition alkalinity range of the high silicon magnesium flux pellet raw material, mgO/SiO 2 Range and SiO 2 And controlling the roasting parameters of the rotary kiln within the content range. The invention analyzes different alkalinity, mgO and SiO by simulating the looping process of pellet powder in the rotary kiln 2 And the generation of liquid phase of the pellet powder compact with ash content, thereby achieving the purpose of reducing ring formation of the rotary kiln.
Description
Technical Field
The invention belongs to the technical field of fluxed pellet preparation, and particularly relates to a method for inhibiting looping of a high-silicon magnesium fluxed pellet rotary kiln.
Background
At present, under the situation that the country advocates environmental protection and limited production, the pellets have the advantages of low energy consumption and little pollution in the production process, and the pellets are widely focused on iron and steel enterprises. The high silicon magnesium fluxed pellet ore has excellent metallurgical performance and is a high-quality raw material of a high-grade, high-benefit, low-energy-consumption and environment-friendly blast furnace. However, during the production process of the magnesium fluxed pellets, part of the pellet powder falls off during the high-temperature roasting process in the rotary kiln due to the addition of the flux in the raw materials, and the powder added with the flux reacts on the lining of the rotary kiln at high temperature to gradually form a binder with certain strength. And the loop formation is frequent and short in period, and a series of hazards are generated: preventing movement and circulation of materials and hot air flow, and reducing pellet quality and yield; the load of the rotary kiln is increased, so that the motor is damaged; the kiln lining refractory material is seriously damaged, so that the furnace shutdown maintenance frequently occurs; after the kiln is stopped for cooling in the treatment of the ring formation, the production efficiency is reduced and the production cost is increased.
Through the above analysis, the problems and defects existing in the prior art are as follows: in the existing production process of high-silicon magnesium fluxed pellets, pellet powder containing fluxed agents with different component contents reacts on the inner lining of the rotary kiln, so that ring formation is easy to occur in the rotary kiln, the ring formation is frequent and short in period, and the movement and circulation of materials and hot air flow are blocked, so that the quality and yield of pellets are reduced; the load of the rotary kiln is increased, so that the motor is damaged; the kiln lining refractory material is seriously damaged, so that the furnace shutdown maintenance frequently occurs; after the kiln is stopped for cooling in the treatment of the ring formation, the production efficiency is reduced and the production cost is increased.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention provides a method for inhibiting the looping of a high silicon magnesium fluxed pellet rotary kiln.
The invention is realized in such a way that the method for inhibiting the looping of the high-silicon magnesium fluxed pellet rotary kiln researches the compression strength of the pellet powder compact and the pellet powder compact by adjusting the content proportion and ash content of each flux in the pellet raw material, and guides the raw material components, the roasting time and the roasting temperature of the magnesium fluxed pellet produced by the rotary kiln by analyzing the compression strength, the liquid phase generation and the ore phase structure, and comprises the following steps:
step one, preparing certain mass of different alkalinity, mgO and SiO 2 The powder with the content is briquetted and roasted, and is ground into powder after being cooled, so that the consolidated powder generated in the rotary kiln by the high-silicon magnesium fluxed pellets is simulated;
the function is as follows: and preparing briquettes with different flux component contents as pellet powder in the rotary kiln.
Respectively adding ash with different mass fractions into the powder prepared in the first step, uniformly mixing and briquetting, and roasting at different roasting temperatures and roasting times to simulate the looping process of the high-silicon-magnesium fluxed pellets in the rotary kiln;
the function is as follows: and (5) testing the roasting process of the briquettes with different flux contents in the rotary kiln.
Step three, after the briquettes roasted in the step two are cooled, respectively preparing the briquettes with certain alkalinity, mgO and SiO 2 FeO-SiO content 2 -CaO-MgO-Al 2 O 3 Performing system analysis on a liquid phase generation rule under a five-membered system, and further determining liquid phase generation behaviors and liquid phase compositions in the roasting process of the high-silicon magnesium fluxed pellet rotary kiln under the system;
the function is as follows: and analyzing and comparing the influences of the content of different raw material components on the compression strength, the liquid phase generation and the ore phase structure of the pellet powder compact.
Regulating and controlling the composition alkalinity range of the high silicon magnesium flux pellet raw material and MgO/SiO according to the analysis result in the step three 2 Range and SiO 2 The content range;
and fifthly, controlling the roasting temperature and the roasting time of the rotary kiln according to the analysis result in the step three.
Step four, five actions: and analyzing the experimental result and guiding the raw material components and the roasting temperature and the roasting time of the magnesium fluxed pellets produced by the rotary kiln.
Further, the basicities in the first step are respectively:0.6, 0.8, 1.0, 1.2, 1.4; the MgO content is respectively as follows: 1.5%, 2.0%, 2.5%; siO (SiO) 2 The content is as follows: 4.0%, 4.5%, 5.0%, 5.5%, 6.0%.
Further, the roasting mode in the first step is 950 ℃ for 10min and 1250 ℃ for 10min.
In the first grinding process, the mass fraction of the powder with the granularity of less than 200 meshes is 80%, and the mass fraction of the powder with the granularity of more than 200 meshes is 20%.
Further, the ash content in the second step is respectively: 0%, 0.25%, 0.5%, 0.75%, 1%, 5%, 10%;
further, the roasting mode in the second step is as follows: preheating temperature 950 ℃ and preheating time 10min, and roasting temperature 1200 ℃, 1220 ℃,1250 ℃, 1280 ℃, 1300 ℃ and roasting time 1min, 5min, 10min and 15min respectively.
Further, the alkalinity in the fourth step ranges from 0.6 to 1.0, mgO: siO (SiO) 2 The percentage content is 0.50-0.625, siO 2 The content range is 4-6%.
Further, the roasting temperature of the rotary kiln in the step five ranges from 1200 ℃ to 1220 ℃ and the roasting time is less than 5min.
In combination with the above technical solution and the technical problems to be solved, please analyze the following aspects to provide the following advantages and positive effects:
first, aiming at the technical problems in the prior art and the difficulty in solving the problems, the technical problems solved by the technical proposal of the invention are analyzed in detail and deeply by tightly combining the technical proposal to be protected, the results and data in the research and development process, and the like, and some technical effects brought after the problems are solved have creative technical effects. The specific description is as follows:
the invention analyzes different alkalinity, mgO and SiO by simulating the looping process of pellet powder in the rotary kiln 2 And the variation of liquid phase generation of the pellet powder compact with ash content, a preparation scheme of high silicon magnesium fluxed pellets is provided, and the reduction is achievedThe purpose of ring formation of the rotary kiln.
Secondly, the technical scheme is regarded as a whole or from the perspective of products, and the technical scheme to be protected has the following technical effects and advantages:
the system comprehensively analyzes the compression strength, ore phase structure and liquid phase generation rule of the pellet powder compacts with different flux contents and different ash contents, and makes key guidance on the production of the magnesia flux pellet rotary kiln according to the compression strength, ore phase structure and liquid phase generation rule. Has systematicness, accuracy and scientificity. Can make great contribution to actual production.
Thirdly, as inventive supplementary evidence of the claims of the present invention, the following important aspects are also presented:
(1) The technical scheme of the invention fills the technical blank in the domestic and foreign industries:
the invention fills the blank of the phenomenon of ring formation in the production of the magnesium fluxed pellet rotary kiln in China, and makes specific and effective production guidance for the production of the magnesium fluxed pellet rotary kiln.
(2) The technical scheme of the invention solves the technical problems that people are always desirous of solving but are not successful all the time:
the invention solves and perfects the phenomenon that the magnesia flux pellet rotary kiln is easy to be bonded on the lining of the rotary kiln in the production process to a certain extent, saves raw materials and improves the production efficiency and the cost.
Drawings
FIG. 1 is a flow chart of a method for inhibiting looping of a high silicon magnesium fluxed pellet rotary kiln provided by an embodiment of the invention;
fig. 2 is a schematic diagram of a method for inhibiting looping of a high silicon magnesium fluxed pellet rotary kiln according to an embodiment of the invention.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
1. The embodiments are explained. In order to fully understand how the invention may be embodied by those skilled in the art, this section is an illustrative embodiment in which the claims are presented for purposes of illustration.
As shown in fig. 1, the method for restraining the ring formation of the high-silicon magnesium fluxed pellet rotary kiln provided by the embodiment of the invention comprises the following steps:
s101, preparing the magnesium alloy with different alkalinity, mgO and SiO 2 The powder with the content is briquetted and roasted, and is ground into powder after being cooled, so that the consolidated powder generated in the rotary kiln by the high-silicon magnesium fluxed pellets is simulated;
s102, respectively adding ash with different mass fractions into the powder prepared in the S101, uniformly mixing and briquetting, and roasting at different roasting temperatures and roasting times to simulate the looping process of the high-silicon-magnesium fluxed pellets in the rotary kiln;
s103, cooling the pressed block after roasting in S102, and respectively treating certain alkalinity, mgO and SiO 2 FeO-SiO content 2 -CaO-MgO-Al 2 O 3 Performing system analysis on a liquid phase generation rule under a five-membered system, and further determining liquid phase generation behaviors and liquid phase compositions in the roasting process of the high-silicon magnesium fluxed pellet rotary kiln under the system;
s104, regulating and controlling the composition alkalinity range and MgO/SiO of the high-silicon magnesium flux pellet raw material according to the analysis result in S103 2 Range and SiO 2 The content range;
s105, controlling the roasting temperature and the roasting time of the rotary kiln according to the analysis result in S103.
The basicities in step S101 in the embodiment of the present invention are respectively: 0.6, 0.8, 1.0, 1.2, 1.4; the MgO content is respectively as follows: 1.5, 2.0, 2.5; siO (SiO) 2 The content is as follows: 4.0, 4.5, 5.0, 5.5, 6.0.
In the step S101 of the embodiment of the invention, the roasting mode is 950 ℃ for 10min and 1250 ℃ for 10min.
In the grinding and pulverizing step S101 in the embodiment of the invention, the mass fraction of the powder with the granularity of less than 200 meshes is 80%, and the mass fraction of the powder with the granularity of more than 200 meshes is 20%.
The ash content in step S102 in the embodiment of the present invention is respectively: 0%, 0.25%, 0.5%, 0.75%, 1%, 5%, 10%;
the roasting mode in step S102 in the embodiment of the present invention is as follows: preheating temperature 950 ℃ and preheating time 10min, and roasting temperature 1200 ℃, 1220 ℃,1250 ℃, 1280 ℃, 1300 ℃ and roasting time 1min, 5min, 10min and 15min respectively.
The alkalinity range in step S104 in the embodiment of the invention is 0.6-1.0, mgO: siO (SiO) 2 In the range of 0.50-0.625, siO 2 The content range is 4-6%.
The roasting temperature range of the rotary kiln in the step S105 is 1200-1220 ℃, and the roasting time is less than 5min.
The invention analyzes different alkalinity, mgO and SiO by simulating the looping process of pellet powder in the rotary kiln 2 And the generation of liquid phase of the pellet powder compact with ash content, a preparation scheme of high-silicon magnesium fluxed pellets is provided, and the aim of reducing ring formation of the rotary kiln is fulfilled.
2. Evidence of the effect of the examples. The embodiment of the invention has a great advantage in the research and development or use process, and has the following description in combination with data, charts and the like of the test process.
The compression strength and the liquid phase generation of the pellet powder compacts with different flux component contents and different ash contents can be known, and under the condition that other conditions are unchanged, the compression strength of the powder compacts gradually decreases along with the increase of the MgO content; under the condition that other conditions are unchanged, the powder pressing block is along with SiO 2 The content is increased, and the compressive strength is gradually increased; under the condition that other conditions are unchanged, the compression strength of the powder compact is gradually increased along with the increase of the alkalinity; from analysis, when MgO and SiO are present 2 The ratio of the percentages is in the range of 0.50 to 0.625, and SiO 2 When the content is in the range of 4-6%, the compressive strength of the magnesium fluxed pellet powder compact reaches a relatively low range when the alkalinity is in the range of 0.6-1.0The liquid phase generation content of the powder compact is relatively low, the metallurgical performance of the magnesia fluxed pellets is met, the strength of the rotary kiln ring forming object is greatly reduced, and the number and frequency of rotary kiln ring forming are reduced.
The foregoing is merely illustrative of specific embodiments of the present invention, and the scope of the invention is not limited thereto, but any modifications, equivalents, improvements and alternatives falling within the spirit and principles of the present invention will be apparent to those skilled in the art within the scope of the present invention.
Claims (10)
1. The method for inhibiting the looping of the high silicon magnesium fluxed pellet rotary kiln is characterized by comprising the following steps of:
step one, preparing different alkalinity, mgO and SiO 2 The powder with the content is briquetted and roasted, and is ground into powder after being cooled, so that the consolidated powder generated in the rotary kiln by the high-silicon magnesium fluxed pellets is simulated;
respectively adding ash with different mass fractions into the powder prepared in the first step, uniformly mixing and briquetting, and roasting at different roasting temperatures and roasting times to simulate the looping process of the high-silicon-magnesium fluxed pellets in the rotary kiln;
step three, after the briquettes roasted in the step two are cooled, respectively preparing the briquettes with certain alkalinity, mgO and SiO 2 FeO-SiO content 2 -CaO-MgO-Al 2 O 3 Performing system analysis on a liquid phase generation rule under a five-membered system, and further determining liquid phase generation behaviors and liquid phase compositions in the roasting process of the high-silicon magnesium fluxed pellet rotary kiln under the system;
regulating and controlling the composition alkalinity range of the high silicon magnesium flux pellet raw material and MgO/SiO according to the analysis result in the step three 2 Range and SiO 2 The content range;
and fifthly, controlling the roasting temperature and the roasting time of the rotary kiln according to the analysis result in the step three.
2. The method for inhibiting looping of high silicon magnesium fluxed pellet rotary kiln as defined in claim 1, wherein the basicities in said step one are respectively: 0.6, 0.8, 1.0, 1.2, 1.4.
3. The method for inhibiting looping of high silicon magnesium fluxed pellet rotary kiln according to claim 1, wherein the MgO content in the first step is: 1.5, 2.0, 2.5; siO (SiO) 2 The content is as follows: 4.0, 4.5, 5.0, 5.5, 6.0.
4. The method for inhibiting looping of high silicon magnesium flux pellet rotary kiln according to claim 1, wherein the roasting mode in the first step is 950 ℃ for 10min and 1250 ℃ for 10min.
5. The method for suppressing looping of high-silicon magnesium flux pellet rotary kiln according to claim 1, wherein in the first grinding powder preparation step, the mass fraction of powder with the granularity of 200 meshes or less is 80%, and the mass fraction of powder with the granularity of 200 meshes or more is 20%.
6. The method for inhibiting looping of high silicon magnesium fluxed pellet rotary kiln according to claim 1, characterized in that the ash content in the second step is respectively: 0%, 0.25%, 0.5%, 0.75%, 1%, 5%, 10%.
7. The method for inhibiting looping of high silicon magnesium fluxed pellet rotary kiln according to claim 1, wherein the roasting mode in the second step is as follows: preheating temperature 950 ℃ and preheating time 10min.
8. The method for suppressing looping of high-silicon magnesium flux pellet rotary kiln as defined in claim 7, wherein the roasting temperature is 1200 ℃, 1220 ℃,1250 ℃, 1280 ℃, 1300 ℃ and the roasting time is 1min, 5min, 10min, 15min respectively.
9. The method for inhibiting looping of high silicon magnesium flux pellet rotary kiln according to claim 1, wherein the alkalinity in the fourth step is in the range of 0.6-1.0, mgO/SiO2 is in the range of 0.50-0.625%, and SiO2 content is in the range of 4-6%.
10. The method for inhibiting looping of high silicon magnesium flux pellet rotary kiln according to claim 1, wherein the roasting temperature of the rotary kiln in the fifth step ranges from 1200 ℃ to 1220 ℃ and the roasting time is less than 5min.
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Application publication date: 20221018 Assignee: TANGSHAN JINSHA COMBUSTION HEAT ENERGY CO.,LTD. Assignor: NORTH CHINA University OF SCIENCE AND TECHNOLOGY Contract record no.: X2023980043595 Denomination of invention: A Method for Suppressing the Formation of High Silicon Magnesia Flux Based Pellets in a Rotary Kiln Granted publication date: 20230425 License type: Common License Record date: 20231016 |