CN113249568B - Sintering raw material and preparation method thereof - Google Patents
Sintering raw material and preparation method thereof Download PDFInfo
- Publication number
- CN113249568B CN113249568B CN202110406864.3A CN202110406864A CN113249568B CN 113249568 B CN113249568 B CN 113249568B CN 202110406864 A CN202110406864 A CN 202110406864A CN 113249568 B CN113249568 B CN 113249568B
- Authority
- CN
- China
- Prior art keywords
- fuel
- fine
- coarse
- return ores
- sintered
- 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
Images
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
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/244—Binding; Briquetting ; Granulating with binders organic
- C22B1/245—Binding; Briquetting ; Granulating with binders organic with carbonaceous material for the production of coked agglomerates
-
- 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
-
- 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
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 particularly relates to a sintering raw material and a preparation method thereof, belonging to the technical field of metallurgy, and the method comprises the following steps: screening the sintered fuel to obtain coarse fuel and fine fuel; screening the sintered return ores to obtain coarse return ores and fine return ores; mixing and digesting the fine fuel, the fine return ores, the iron ore powder, the quicklime and the limestone to obtain a digested and sintered mixture; mixing and granulating the digested and sintered mixture and the coarse return ores to obtain a sintered crude product; mixing and granulating the crude fuel and the sintering crude product to obtain a sintering raw material; can realize large granularity of the granulated particles, high strength and strong pulverization resistance, and the fuel is reasonably distributed in the sinter bed.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a sintering raw material and a preparation method thereof.
Background
In the iron ore sintering process, the permeability and carbon distribution of the sinter bed are important factors influencing the sintering process and the quality of the sinter. The higher air permeability of the material layer can improve the sintering speed, thereby improving the yield of the sinter.
In order to improve the air permeability of the sintering material layer, the sintering raw material is subjected to raw material pretreatment by adopting a uniform mixing granulation process before being distributed to a sintering machine. The prior granulating process usually adopts a two-stage or three-stage granulating process, and all the raw materials are added at one time.
Disclosure of Invention
In view of the above problems, the present invention has been made to provide a sintering raw material and a method for producing the same that overcome or at least partially solve the above problems.
The embodiment of the invention provides a preparation method of a sintering raw material, which comprises the following steps:
screening the sintered fuel to obtain coarse fuel and fine fuel;
screening the sintered return ores to obtain coarse return ores and fine return ores;
mixing and digesting the fine fuel, the fine return ores, the iron ore powder, the quick lime and the limestone to obtain a digested and sintered mixture;
mixing and granulating the digested and sintered mixture and the coarse return ores to obtain a sintered crude product;
and mixing the crude fuel and the sintering crude product, and granulating to obtain a sintering raw material.
Optionally, the particle size of the coarse fuel is 1mm-3mm, and the particle size of the fine fuel is less than 1mm.
Optionally, the grain size of the coarse return ores is larger than or equal to 1mm, and the grain size of the fine return ores is smaller than 1mm.
Optionally, the fine fuel, the fine return ores, the iron ore powder, the quick lime and the limestone are mixed and digested to obtain a digested and sintered mixture, the digesting process is preheated by steam, and the digesting time is 1-2 hours.
Optionally, before the digested and sintered mixture and the coarse return fines are mixed, the coarse return fines are wetted with an additive.
Optionally, the additive comprises, by weight, 0.1% -0.5% of polyacrylamide, 1% -3% of quicklime and the balance water.
Optionally, the amount of the additive is 1-3% by weight of the coarse return fines.
Optionally, the additive is used in an amount of 1.5% by weight of the coarse return fines.
Optionally, in the step of wetting the coarse return ores by using the additive, the wetting mode is atomizing, spraying and wetting.
Based on the same inventive concept, the embodiment of the invention also provides a sintering raw material, and the sintering raw material is prepared by adopting the preparation method of the sintering raw material.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
the preparation method of the sintering raw material provided by the embodiment of the invention comprises the following steps: screening the sintered fuel to obtain coarse fuel and fine fuel; screening the sintered return ores to obtain coarse return ores and fine return ores; mixing and digesting the fine fuel, the fine return ores, the iron ore powder, the quick lime and the limestone to obtain a digested and sintered mixture; mixing and granulating the digested and sintered mixture and the coarse return ores to obtain a sintered crude product; mixing the crude fuel and the sintering crude product, and granulating to obtain a sintering raw material; when a digestive and sintered mixture is prepared, the coarse return ores and the coarse fuel are screened out, the amount of the mixture can be reduced, the uniform mixing effect is improved, the uniform distribution of the fusible fine return ores and the fine fuel in the digestive and sintered mixture is realized, after a sintered crude product is prepared, the granulation process is realized for most of particles, after the coarse fuel is distributed to the sintered crude product, the thickness of the powder adhered to the surface of the fuel can be reduced, the particle size of the fuel granulation is reduced, and excessive large fuel granulation particles are prevented from being formed, so that the segregation of the fuel to the bottom in the material distribution sintering process can be avoided, the combustion efficiency of the fuel in the combustion process can be improved, and the temperature distribution of a sintering material layer is improved; the method provided by the invention can realize large granularity, high strength and strong pulverization resistance of the granulated particles, and the fuel is reasonably distributed in the sinter bed.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a flow chart of a method provided by an embodiment of the present invention;
FIG. 2 is a schematic diagram of the process steps provided by an embodiment of the present invention;
fig. 3 is a graph showing the variation of the additive amount and the adhesion ratio of the return ores after granulation according to the embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
In order to solve the technical problems, the general idea of the embodiment of the application is as follows:
the prior sintering material granulation process usually adopts a two-stage or three-stage granulation process, all the raw materials are added at one time, and the applicant finds out in the invention process that: the existing process does not consider the granulation property difference of each raw material, the granulation effect of the sintering raw material is poor, meanwhile, the sintering return mine has certain alkalinity, the sintering process is easy to melt, but the granulation effect is poor due to strong hydrophobicity, the particle size of the formed return mine granulation particles is small, the strength is poor, in addition, the phenomenon of granulation particle pulverization due to the fact that lime cannot be completely digested in the transient mixing granulation process and is digested after the storage before cloth sintering and the cloth distribution is caused, and therefore the particle size and the strength of the treatment material are reduced, and the improvement of air permeability and the bonding with a liquid phase are not facilitated. Because of the automatic heat storage function in the sintering process, the lower part of the sintering material layer is often high in heat, and the fuel is usually distributed in a segregation manner to reduce the carbon content of the lower material layer, but the fuel particles are treated by the conventional method to form large fuel granulation pellets which are easily distributed to the bottom of the sintering material layer through distribution segregation, so that the carbon content of the lower layer is high, and the improvement of the heat distribution of the sintering material layer is not facilitated. Therefore, the embodiment of the invention aims to provide a brand-new sintering material preparation method to solve the above problems.
According to an exemplary embodiment of the present invention, there is provided a sintering material processing method, as shown in fig. 2, including the steps of:
s1, screening sintered fuel to obtain coarse fuel and fine fuel; specifically, the sintering fuel refers to coke powder or anthracite powder.
In an alternative embodiment, the particle size of the raw fuel is 1mm to 3mm and the particle size of the fine fuel is < 1mm. Usually-1 mm is used as the particle size limit of the fine particle adhesive powder and the nuclear particles, the fine particle fuel can provide heat of the adhesive powder in the sintering process, and the-1 mm fuel is mixed with other fine particle raw materials strongly to improve the fusibility of the fine particle adhesive powder. The maximum particle size of the fuel is controlled to be-3 mm, so that the problems of overlong combustion time and incomplete combustion of the fuel can be avoided, and the particle size of the granulated fuel can be avoided to be overlarge.
S2, screening the sintered return ores to obtain coarse return ores and fine return ores; specifically, the sintered return ores refer to sintered self-return ores or blast furnace return ores.
As an optional implementation mode, the grain size of the coarse return ores is larger than or equal to 1mm, and the grain size of the fine return ores is smaller than 1mm. Usually-1 mm is used as the particle size limit of the fine particle adhesive powder and the nuclear particles, the fine particle return ores are easy to melt in the sintering process due to the fact that the fine particle return ores have high alkalinity, and the fusibility of the fine particle adhesive powder can be improved by strongly mixing the-1 mm return ores with other fine particle raw materials.
S3, mixing and digesting the fine fuel, the fine return ores, the iron ore powder, the quick lime and the limestone to obtain a digested and sintered mixture; it should be noted that intensive mixing is usually employed for the mixing here in order to improve the degree of uniform mixing of the raw materials, but it is needless to say that other mixing methods may be employed, and the final purpose is to sufficiently mix the raw materials uniformly.
Through carrying out the intensive mixing with sintering raw materials, improve the mixing degree of raw materials, reject the coarse return fines and the coarse fuel that the pelletization performance is relatively poor simultaneously, can reduce the mixture volume and improve the mixing effect, can realize again that fine return fines and fine fuel evenly distributed in sintering raw materials.
The fine fuel, the mixture of the fine return ores and the iron ore powder, the quick lime and the limestone are digested under the condition of steam introduction, the digestion degree and the digestion speed of the quick lime can be improved, more calcium hydroxide can be completely formed by digestion of the quick lime, the cohesive force of the once mixed material can be improved, pulverization caused by digestion after granulation in the later period is avoided, the temperature of the mixture can be improved due to heat release in the digestion process, and the air permeability of a material layer is improved.
As an optional implementation manner, the fine fuel, the fine return ores, the iron ore powder, the quick lime and the limestone are mixed and digested to obtain a digested and sintered mixture, the digestion process is preheated by steam, and the digestion time is 1h-2h.
The excessively short digestion time is not beneficial to complete digestion of the quicklime, the too long digestion time causes overlarge digestion equipment and material adhesion, the digestion time is controlled to be 1-2h, complete digestion of the quicklime and appropriate size of the digestion equipment can be realized, and meanwhile, the buffer production process can be adjusted.
S4, mixing and granulating the digested and sintered mixture and the coarse return ores to obtain a sintered crude product;
as an alternative embodiment, the coarse return fines are moistened with an additive before the digestion and sintering mix and the coarse return fines are mixed. Optionally, the wetting mode is atomized spraying wetting; specifically, the components of the additive comprise, by weight, 0.1% -0.5% of polyacrylamide, 1% -3% of quicklime and the balance water.
The crude return fines are high in hydrophobicity, so that adhesion powder is not easy to adhere to the crude return fines in the traditional blending and granulating process, granulated particles are small, the strength is low, the adhesion capability of the return fines can be improved by spraying additives with improved adhesion performance onto the surface of the return fines in an atomizing manner, and the granulation granularity and strength of the crude return fines can be improved by combining with the improvement of the adhesion performance of the digested primary blending and granulating material.
As an alternative embodiment, the additive is used in an amount of 1% to 3% by weight of the coarse return fines, wherein the amount is preferably 1.5%.
Regarding the amount of the additive, when the amount of the additive is too low to effectively cover the surface of the return fine, and when the amount of the additive is too high, the additive may cause adhesion during the conveying process and increase the cost of the additive, the applicant performs tests on the amount of the additive as 0%, 0.1%, 0.5%, 1%, 1.5%, 2% and 3% of the amount of the coarse return fine, and measures the adhesion ratio of each test, and as a result, as shown in fig. 3, it can be seen that a good granulation effect is obtained when the amount of the additive is more than 1%, and a better effect is obtained when the amount of the additive is more than 1.5%. However, in consideration of the problems of sticking of the conveying equipment, increase in cost and the like caused by excessive use of the additive in actual use, a preferable effect can be achieved by using 1.5%.
And S5, mixing and granulating the crude fuel and the sintering crude product to obtain a sintering raw material.
According to the whole scheme, when the digestion and sintering mixture is prepared, the coarse return ores and the coarse fuel are screened, so that the amount of the mixture can be reduced, the uniform mixing effect is improved, and the uniform distribution of the fusible fine return ores and the fusible fine fuel in the digestion and sintering mixture is realized; the mixture of the fine fuel, the fine return ores, the iron ore powder, the quicklime and the limestone is digested under the steam condition, so that the digestion degree and the digestion speed of the quicklime can be improved, more calcium hydroxide is completely formed by the digestion of the quicklime, the cohesive force of the primary mixed material can be improved, the pulverization caused by continuous digestion of particles after final granulation can be avoided, and meanwhile, the temperature of the mixture can be improved by the digestion and heat release, and the air permeability of a material layer can be improved; the additive is used for atomizing and wetting the coarse return ores, so that the wettability and the adhesion of the surfaces of the coarse return ores can be improved, and the return ores can form granulated particles with high strength and large particles in the subsequent granulating process; after the sintering crude product is prepared, most particles realize the granulating process, and after the crude fuel is distributed to the sintering crude product, the thickness of the powder adhered to the surface of the fuel can be reduced, the particle size of the fuel granulating is reduced, and excessive larger fuel granulating particles are prevented from being formed, so that the segregation of the fuel to the bottom in the sintering material distribution process can be avoided, the combustion efficiency of the fuel in the combustion process can be improved, and the temperature distribution of a sintering material layer is improved; therefore, by the method provided by the invention, under the mutual synergistic action among the steps, the large particle size, high strength and strong pulverization resistance of the granulated particles can be realized, and the fuel is reasonably distributed in the sinter layer.
The sintering material and the method for producing the same according to the present application will be described in detail below with reference to examples, comparative examples, and experimental data.
Example 1
A method of preparing a sintering feedstock, the method comprising:
s1, screening the sintered fuel to obtain a coarse fuel and a fine fuel;
s2, screening the sintered return ores to obtain coarse return ores and fine return ores;
s3, adding water into sintering raw materials such as 70 parts of iron ore powder, 1.2 parts to 1mm of fine fuel, 6 parts of quicklime, 8 parts of limestone and 6 parts to 1mm of fine return ores for strong mixing for the first time, and then introducing steam for digestion for 1 hour to obtain a digested sintered mixture;
s4, mixing and granulating the digested and sintered mixture and the coarse return ores to obtain a sintered crude product, and wetting the coarse return ores before mixing the digested and sintered mixture and the coarse return ores, wherein the method specifically comprises the following steps: atomizing and wetting 24 parts of coarse return ores with the grain size of +1mm by using an additive, wherein the using amount of the additive is 1.5 percent, the proportioning of the additive comprises 0.5 percent of polyacrylamide, 1 percent of quicklime and the balance of water;
and S5, mixing and granulating 2.3 parts of 1-3mm crude fuel and the sintering crude product to obtain a sintering raw material.
Example 2
A method of preparing a sintering feedstock, the method comprising:
s1, screening sintered fuel to obtain coarse fuel and fine fuel;
s2, screening the sintered return ores to obtain coarse return ores and fine return ores;
s3, adding water into sintering raw materials such as 70 parts of iron ore powder, 1.2 parts of 1 mm-1 mm fine grain fuel, 6 parts of quicklime, 8 parts of limestone and 6 parts of 1 mm-1 mm fine grain return ore for primary strong mixing, and then introducing steam for digestion for 1.5 hours to obtain a digested and sintered mixture;
s4, mixing and granulating the digested and sintered mixture and the coarse return ores to obtain a sintered crude product, and wetting the coarse return ores before mixing the digested and sintered mixture and the coarse return ores, wherein the method specifically comprises the following steps: atomizing and wetting 24 parts of coarse return ores with the grain size of +1mm by using an additive, wherein the using amount of the additive is 1.5 percent, the proportioning of the additive is that the content of polyacrylamide is 0.1 percent, quicklime is 3 percent, and the balance is water;
s5, mixing 2.3 parts of 1-3mm crude fuel and the sintering crude product, and granulating to obtain a sintering raw material.
Example 3
A method of preparing a sintering feedstock, the method comprising:
s1, screening sintered fuel to obtain coarse fuel and fine fuel;
s2, screening the sintered return ores to obtain coarse return ores and fine return ores;
s3, adding water into sintering raw materials such as 70 parts of iron ore powder, 1.2 parts of 1 mm-1 mm fine grain fuel, 6 parts of quicklime, 8 parts of limestone and 6 parts of 1 mm-1 mm fine grain return ore for primary strong mixing, and then introducing steam for digestion for 2 hours to obtain a digested and sintered mixture;
s4, mixing and granulating the digested and sintered mixture and the coarse return ores to obtain a sintered crude product, and wetting the coarse return ores before mixing the digested and sintered mixture and the coarse return ores, wherein the method specifically comprises the following steps: atomizing and wetting 24 parts of coarse return ores with the grain size of +1mm by using an additive, wherein the using amount of the additive is 1.5 percent, the proportioning of the additive comprises 0.3 percent of polyacrylamide, 2 percent of quicklime and the balance of water;
s5, mixing 2.3 parts of 1-3mm crude fuel and the sintering crude product, and granulating to obtain a sintering raw material.
Comparative example 1
A method of preparing a sintering feedstock, the method comprising:
s1, screening the sintered fuel to obtain a coarse fuel and a fine fuel;
s2, screening the sintered return ores to obtain coarse return ores and fine return ores;
s3, adding water into sintering raw materials such as 70 parts of iron ore powder, 1.2 parts of 1 mm-1 mm fine grain fuel, 2.3 parts of 1mm-3mm coarse grain fuel, 6 parts of quicklime, 8 parts of limestone, 6 parts of 1 mm-1 mm fine grain return ore, 24 parts of +1mm coarse grain return ore and the like for primary strong mixing, and then respectively carrying out secondary mixing and tertiary mixing to obtain final prepared granules for sintering.
Comparative example 2
A method of preparing a sintering feedstock, the method comprising:
s1, screening sintered fuel to obtain coarse fuel and fine fuel;
s2, screening the sintered return ores to obtain coarse return ores and fine return ores;
s3, adding water into sintering raw materials such as 70 parts of iron ore powder, 1.2 parts of 1 mm-1 mm fine grain fuel, 2.3 parts of 1mm-3mm coarse grain fuel, 6 parts of quicklime, 8 parts of limestone and 6 parts of 1 mm-1 mm fine grain return ore for primary strong mixing, and then digesting for 1.5 hours by introducing steam to obtain a digested and sintered mixture;
s4, mixing and granulating the digested and sintered mixture and the coarse return ores to obtain a sintered crude product, and wetting the coarse return ores before mixing the digested and sintered mixture and the coarse return ores, wherein the method specifically comprises the following steps: atomizing and wetting 24 parts of coarse return ores with the grain size of +1mm by using an additive, wherein the using amount of the additive is 1.5 percent, the proportioning of the additive is that the content of polyacrylamide is 0.1 percent, quicklime is 3 percent, and the balance is water;
and S5, granulating the sintering crude product to obtain a sintering raw material.
Comparative example 3
A method of preparing a sintering feedstock, the method comprising:
s1, screening sintered fuel to obtain coarse fuel and fine fuel;
s2, screening the sintered return ores to obtain coarse return ores and fine return ores;
s3, adding water into sintering raw materials such as 70 parts of iron ore powder, 1.2 parts of 1mm fine grain fuel, 6 parts of quicklime, 8 parts of limestone, 6 parts of 1mm fine grain return fines and 24 parts of +1mm coarse grain return fines for primary strong mixing to obtain a sintering mixture;
s4, granulating the sintering mixture to obtain a sintering crude product;
s5, mixing and granulating 2.3 parts of 1-3mm coarse-grained fuel and the sintered crude product to obtain a sintering raw material.
The sintering raw materials obtained in examples 1 to 3 and comparative examples 1 to 3 were subjected to the test, and the test results are shown in the following table.
As can be seen from the data in the table, examples 1 to 3 using the method of the present invention achieved an increase in the average particle size of the final granulated material, which was 0.4mm, 0.3mm and 0.2mm, respectively, as compared to comparative example 1 using the conventional method, and the average particle size of the final granulated material after falling was also increased by 0.6mm, 0.5mm and 0.5mm, respectively, and the permeability index of the final granulated material was also significantly increased by 38%, 36% and 36%, respectively. In addition, from the carbon content distribution after the distribution, the lower carbon contents of examples 1 to 3 were all lower than that of comparative example 1, and effective segregation of the carbon content was achieved.
In comparative example 2, the average particle size of the finally obtained pellet was 3.5mm, the average particle size after dropping 0.5m for 2 times was 3.1mm, and the air permeability index was 5.8, which were lower than those obtained by the method of the present invention, and the carbon contents of the upper, middle and lower layers of the material layer after the material distribution were 3.0%, 3.3% and 3.4%, respectively, and the carbon content of the lower layer was also higher than those of the present invention.
In comparative example 3, the average particle size of the finally obtained pellets was 3.3mm, the average particle size after dropping 2 times at 0.5m was 3.0mm, and the air permeability index was 5.1, both being lower than those of examples of the present invention.
One or more technical solutions in the embodiments of the present invention at least have the following technical effects or advantages:
(1) According to the method provided by the embodiment of the invention, when the digestion and sintering mixture is prepared, the coarse return ores and the coarse fuel are screened, so that the amount of the mixture can be reduced, the uniform mixing effect is improved, and the uniform distribution of the fusible fine return ores and the fusible fine fuel in the digestion and sintering mixture is realized;
(2) According to the method provided by the embodiment of the invention, the mixture of the fine fuel, the fine return ores and the iron ore powder, the quick lime and the limestone is digested under the steam condition, so that the digestion degree and the digestion speed of the quick lime can be improved, more calcium hydroxide is completely formed by the digestion of the quick lime, the cohesive force of the primary mixed material can be improved, the pulverization caused by continuous digestion of particles after final granulation can be avoided, and meanwhile, the temperature of the mixture can be improved by digestion heat release, and the air permeability of a material layer can be improved;
(3) According to the method provided by the embodiment of the invention, the additive is used for atomizing and wetting the rough return ores, so that the wettability and the adhesion of the surface of the rough return ores can be improved, and the return ores can form granulated particles with high strength and large particles in the subsequent granulating process;
(4) According to the method provided by the embodiment of the invention, after the sintered crude product is prepared, most particles realize a granulation process, and after the crude fuel is distributed to the sintered crude product, the thickness of the adhering powder on the surface of the fuel can be reduced, the particle size of the fuel granulation is reduced, and excessive and large fuel granulation particles are avoided, so that the fuel can be prevented from segregating to the bottom in the sintering and distributing process, the combustion efficiency of the fuel in the combustion process can be improved, and the temperature distribution of a sintering material layer is improved;
(5) According to the method provided by the embodiment of the invention, under the mutual synergistic action among the steps, the large particle size, high strength and strong pulverization resistance of the granulated particles can be realized, and the fuel is reasonably distributed in the sinter layer.
Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (4)
1. A method of preparing a sintering material, the method comprising:
screening the sintered fuel to obtain coarse fuel and fine fuel;
screening the sintered return ores to obtain coarse return ores and fine return ores;
mixing and digesting the fine fuel, the fine return ores, the iron ore powder, the quick lime and the limestone to obtain a digested and sintered mixture; preheating by using steam in the digestion process, wherein the digestion time is 1-2 h;
mixing and granulating the digested and sintered mixture and the coarse return ores to obtain a sintered crude product;
mixing the crude fuel and the sintering crude product, and granulating to obtain a sintering raw material;
the particle size of the coarse fuel is 1mm-3mm, and the particle size of the fine fuel is less than 1mm;
the grain size of the coarse return ores is more than or equal to 1mm, and the grain size of the fine return ores is less than 1mm;
wetting the coarse return ores by using additives before mixing the digested and sintered mixture and the coarse return ores;
the components of the additive comprise 0.1-0.5 percent of polyacrylamide, 1-3 percent of quicklime and the balance of water;
the dosage of the additive is 1% -3% of the coarse return fine.
2. The method for producing a sintering material according to claim 1, characterized in that the additive is used in an amount of 1.5% by weight based on the coarse return fine.
3. The method for preparing a sintering raw material according to claim 2, wherein the step of wetting the coarse return ores by using the additive is carried out by atomizing and spraying.
4. A sintering raw material characterized by being produced by the method for producing a sintering raw material according to any one of claims 1 to 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110406864.3A CN113249568B (en) | 2021-04-15 | 2021-04-15 | Sintering raw material and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110406864.3A CN113249568B (en) | 2021-04-15 | 2021-04-15 | Sintering raw material and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113249568A CN113249568A (en) | 2021-08-13 |
| CN113249568B true CN113249568B (en) | 2022-10-21 |
Family
ID=77220843
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110406864.3A Active CN113249568B (en) | 2021-04-15 | 2021-04-15 | Sintering raw material and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113249568B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000303121A (en) * | 1999-04-19 | 2000-10-31 | Nippon Steel Corp | Pretreatment of sintering raw material |
| CN104232883A (en) * | 2013-06-19 | 2014-12-24 | 宝山钢铁股份有限公司 | Mineral material usage method for increasing usage amount and production rate of sintered iron concentrate |
| CN105296746A (en) * | 2014-07-30 | 2016-02-03 | 宝山钢铁股份有限公司 | Method for reducing sintered solid fuel consumption |
| CN105420491A (en) * | 2015-11-27 | 2016-03-23 | 攀钢集团攀枝花钢钒有限公司 | Iron ore sintering method |
| CN108396136A (en) * | 2017-02-05 | 2018-08-14 | 鞍钢股份有限公司 | A kind of sintered compound preparation method for material and its distributing method and device |
-
2021
- 2021-04-15 CN CN202110406864.3A patent/CN113249568B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000303121A (en) * | 1999-04-19 | 2000-10-31 | Nippon Steel Corp | Pretreatment of sintering raw material |
| CN104232883A (en) * | 2013-06-19 | 2014-12-24 | 宝山钢铁股份有限公司 | Mineral material usage method for increasing usage amount and production rate of sintered iron concentrate |
| CN105296746A (en) * | 2014-07-30 | 2016-02-03 | 宝山钢铁股份有限公司 | Method for reducing sintered solid fuel consumption |
| CN105420491A (en) * | 2015-11-27 | 2016-03-23 | 攀钢集团攀枝花钢钒有限公司 | Iron ore sintering method |
| CN108396136A (en) * | 2017-02-05 | 2018-08-14 | 鞍钢股份有限公司 | A kind of sintered compound preparation method for material and its distributing method and device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113249568A (en) | 2021-08-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101928824B (en) | Sinter production method for reducing sintering solid burnup and enhancing intensity | |
| JP5000366B2 (en) | Method for producing sintered ore | |
| CN105002352B (en) | A kind of preparation method of high performance pellet binder | |
| CN103320607B (en) | A kind of cold-consolidated ball and preparation method thereof | |
| CN107008914B (en) | Reduced iron powder production process for improving performance of reduced iron powder | |
| CN101381809B (en) | Method for preparing sintering ore of vanadium-titanium magnetite ore | |
| CN111020178B (en) | Comprehensive sintering method of large-proportion limonite | |
| CN111809045B (en) | Cold pressing block for converter and preparation method thereof | |
| CN110295261B (en) | Smelting method of high-manganese steel-making molten iron | |
| CN113528808B (en) | Sintered ore based on high-crystal-water limonite and magnetic separation tailings and production method thereof | |
| CN115747483B (en) | Production method of zero bentonite pellets | |
| CN113186391A (en) | Pellet and preparation method thereof | |
| CN101994002B (en) | Method for sintering ore blending of Jianshan concentrate fines and limonite | |
| CN110283992B (en) | High-proportion limonite sintering method | |
| US4168966A (en) | Agglomerates for use in a blast furnace and method of making the same | |
| CN110317948B (en) | Sintering method of meishan iron ore concentrate | |
| CN113249568B (en) | Sintering raw material and preparation method thereof | |
| JP6369113B2 (en) | Method for producing sintered ore | |
| CN114934173A (en) | Reinforced sintering method for fuel fractional addition | |
| CN109207718A (en) | The method for preparing stainless steel raw material sinter using nickel slag | |
| CN104498707B (en) | A kind of manufacture method of green pellets | |
| CN108774684B (en) | Application method of stainless steel refining slag in laterite sintering | |
| JP4231468B2 (en) | Method for producing sintered ore | |
| CN113981215B (en) | Method for preparing sinter by taking municipal sludge and metallurgical dust as raw materials | |
| CN114763581B (en) | Solid waste pelletizing process and efficient sintering 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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |