CN112430694A - Return-ore type blast furnace raw material and preparation method thereof - Google Patents
Return-ore type blast furnace raw material and preparation method thereof Download PDFInfo
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- CN112430694A CN112430694A CN202011214998.7A CN202011214998A CN112430694A CN 112430694 A CN112430694 A CN 112430694A CN 202011214998 A CN202011214998 A CN 202011214998A CN 112430694 A CN112430694 A CN 112430694A
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- 239000002994 raw material Substances 0.000 title claims abstract description 63
- 238000002360 preparation method Methods 0.000 title claims abstract description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 70
- 229910052742 iron Inorganic materials 0.000 claims abstract description 33
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 25
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 25
- 239000010881 fly ash Substances 0.000 claims abstract description 25
- 239000004571 lime Substances 0.000 claims abstract description 25
- 239000000440 bentonite Substances 0.000 claims abstract description 15
- 229910000278 bentonite Inorganic materials 0.000 claims abstract description 15
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 claims abstract description 12
- 239000000203 mixture Substances 0.000 claims description 23
- 238000003756 stirring Methods 0.000 claims description 19
- 238000002156 mixing Methods 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 229910000831 Steel Inorganic materials 0.000 claims description 12
- 239000010959 steel Substances 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 10
- 229910052681 coesite Inorganic materials 0.000 claims description 9
- 229910052906 cristobalite Inorganic materials 0.000 claims description 9
- 238000003825 pressing Methods 0.000 claims description 9
- 239000000377 silicon dioxide Substances 0.000 claims description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 9
- 229910052682 stishovite Inorganic materials 0.000 claims description 9
- 229910052905 tridymite Inorganic materials 0.000 claims description 9
- 238000000034 method Methods 0.000 abstract description 17
- 238000005245 sintering Methods 0.000 abstract description 6
- 239000002699 waste material Substances 0.000 abstract description 5
- 238000012946 outsourcing Methods 0.000 abstract description 3
- 239000008188 pellet Substances 0.000 abstract description 3
- 238000012360 testing method Methods 0.000 description 11
- 238000000227 grinding Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 2
- 229910000323 aluminium silicate Inorganic materials 0.000 description 2
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/008—Composition or distribution of the charge
-
- 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
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/243—Binding; Briquetting ; Granulating with binders inorganic
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Inorganic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to the technical field of blast furnace raw material production, in particular to a return-ore type blast furnace raw material and a preparation method thereof, wherein the return-ore type blast furnace raw material comprises the following components in parts by weight: 50-60 parts of return ores, 1-6 parts of metallurgical lime, 20-35 parts of iron scales, 9-13 parts of bentonite and 2-4 parts of fly ash. The return mine type blast furnace raw material prepared by the method has the strength meeting the requirement of the blast furnace raw material. The invention does not need to increase the strength through sintering, saves energy, protects the environment, is mainly made of waste materials, is green and environment-friendly, and has the raw materials of the return-ore type blast furnace which are lower than the price of outsourcing sintered ore by about 80-100 yuan/ton, lower than the price of pellet ore by about 150 yuan/ton and lower than the price of non-lump ore by about 50 yuan/ton.
Description
Technical Field
The invention relates to the technical field of blast furnace raw material production, in particular to a return-ore type blast furnace raw material and a preparation method thereof.
Background
Under the guidance of the national current environmental protection policy, the state applies the ultra-low emission requirement to the metallurgical industry, and meanwhile, the modes of stopping, limiting the yield of a sintering machine and the like are adopted in the heating season in winter to carry out emission reduction and limiting the emission to the metallurgical industry, so that the situation of shortage of raw materials of an iron making process in the metallurgical industry is directly influenced, and the operation to the metallurgical industry is also directly influenced.
At present, return ores generated in the production process of blast furnaces at home and abroad have small granularity and low porosity and cannot be directly reused in the production of the blast furnaces. The traditional return ores are recovered and then sintered at high temperature by a sintering machine to increase the strength, and then the recovered return ores can be reused as blast furnace raw materials.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a return-ore type blast furnace raw material and a preparation method thereof.
In order to achieve the above object, a first aspect of the present invention provides a return-ore type blast furnace raw material, comprising the following components in parts by weight: 50-60 parts of return ores, 1-6 parts of metallurgical lime, 20-35 parts of iron scales, 9-13 parts of bentonite and 2-4 parts of fly ash.
Preferably, the return-ore type blast furnace raw material comprises the following components in parts by weight: 50-55 parts of return ores, 1-3 parts of metallurgical lime, 20-27 parts of iron scales, 9-11 parts of bentonite and 2-3 parts of fly ash.
Preferably, the return ores are divided into three parts, the average grain size of the first part of return ores is 200-500 mu m, the average grain size of the second part of return ores is 60-100mm, and the average grain size of the third part of return ores is 2-4 mm.
Preferably, the return fines comprise 6-9wt% FeO.
Preferably, the metallurgical lime comprises CaO and SiO2The content of CaO is more than or equal to 80wt%, and SiO is2The content of (B) is less than or equal to 2 wt%.
Preferably, the metallurgical lime comprises CaO and SiO2The content of CaO is 80-85wt%, and SiO2The content of (B) is 1-2 wt%.
Preferably, the scale is iron scrap produced by a steel mill and/or a steel mill.
Preferably, the content of the iron element in the iron scale is more than or equal to 30 wt%.
Preferably, the fly ash is produced by the metallurgical industry.
A second aspect of the present invention provides a method for producing a return type blast furnace raw material according to the first aspect, including the steps of:
(1) mixing and stirring the return ores, the metallurgical lime and the iron scale for 0.5-2 hours to obtain a mixture;
(2) adding bentonite, fly ash and water into the mixture, and continuously stirring for 0.5-2h under a closed condition;
(3) and (3) pressing the product obtained in the step (2) into balls, and then piling and airing for 2-4 days.
Preferably, said water is used in an amount of 1-3 wt.%, relative to the total amount of said mixture.
The inventor of the invention finds that the return mine type blast furnace raw material with the strength meeting the requirement of the blast furnace raw material can be prepared by mixing the return mine with metallurgical lime and iron scale, then adding bentonite and fly ash for mixing, stirring for 0.5-2h under the condition of density, then pressing into balls, piling and airing. The invention recycles the return fines generated in the blast furnace ironmaking production process, reduces the production cost of enterprises, avoids the situation that the return fines pass through a sintering machine after being recycled by the traditional process, saves energy, protects the environment, is mostly waste materials, is green and environment-friendly, and has the raw materials of the return fines type blast furnace which are about 80-100 yuan/ton lower than that of outsourcing sintered ores, about 150 yuan/ton lower than that of pellet ores and about 50 yuan/ton lower than that of non-lump ores.
The inventor of the present invention further finds that the porosity and strength of the return-ore type blast furnace raw material can be further improved by grinding the return ores into three different particle sizes in advance, specifically, the average particle size of the first portion of the return ores is 200-500 μm, the average particle size of the second portion of the return ores is 60-100mm, and the average particle size of the third portion of the return ores is 2-4mm, and then mixing the particles to serve as the return-ore raw material, wherein the porosity is improved by about 3%, and the strength is improved by about 5%.
Detailed Description
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
As described above, the first aspect of the present invention provides a return type blast furnace raw material, which comprises the following components in parts by weight: 50-60 parts of return ores, 1-6 parts of metallurgical lime, 20-35 parts of iron scales, 9-13 parts of bentonite and 2-4 parts of fly ash.
In the invention, the return ores refer to sintering ore waste materials which are not completely burnt and are generated in the production of metallurgical industry. Preferably, the return fines comprise 6-9wt% FeO. By adopting the optimal selection scheme, the quality, particularly the strength, of the return-ore blast furnace raw materials can be improved. The invention has no restriction on other compositions of the return ores, and the return ores are only waste sinter ores which are not completely burnt and are generated in the production of metallurgical industry and contain 6 to 9 weight percent of FeO.
In a preferred embodiment of the invention, the return ores are divided into three parts, wherein the average grain size of the return ores in the first part is 200-500 μm, the average grain size of the return ores in the second part is 60-100mm, and the average grain size of the return ores in the third part is 2-4 mm. The inventor of the invention finds that the return fine composed of the three parts is used as the return fine raw material, so that the porosity and the strength of the return fine blast furnace raw material can be further improved, wherein the porosity is improved by about 3 percent, and the strength is improved by about 5 percent; by adopting the scheme of returning ores with the average grain diameter of 1-15mm, the porosity is improved by about 0.7-1%, and the strength is improved by about 0.4-1%.
According to the invention, preferably, the metallurgical lime comprises CaO and SiO2The content of CaO is more than or equal to 80wt%, and SiO is2The content of (B) is less than or equal to 2 wt%. The present invention is not limited to other compositions of metallurgical lime as long as the above-mentioned specific contents of CaO and SiO are satisfied2The object of the present invention can be achieved.
More preferably, the metallurgical lime comprises CaO and SiO2The content of CaO is 80-85wt%, and SiO2The content of (B) is 1-2 wt%.
According to the invention, preferably, the iron scale is iron scrap produced by a steel mill and/or a steel mill. In the present invention, the iron scale may be derived from iron scrap generated from a steel mill, or may be a mixture of iron scrap generated from a steel mill and iron scrap generated from a steel mill. In the invention, the content of iron element in the iron scale is more than or equal to 30wt%, and the invention has no limitation on other components except iron in the iron scale, and the aim of the invention can be realized only by steel plants and/or steel mills.
According to the present invention, the fly ash is preferably produced by the metallurgical industry, and the composition of the fly ash is not limited in the present invention as long as the fly ash is derived from the fly ash produced by the metallurgical industry, and generally, the fly ash produced by the metallurgical industry mainly contains aluminosilicate, carbonate, sulfate, oxide and chloride, and the total content of the aluminosilicate, carbonate, sulfate, oxide and chloride is 50wt% or more.
As described above, a second aspect of the present invention provides a method for producing a return type blast furnace raw material according to the first aspect, including the steps of:
(1) mixing and stirring the return ores, the metallurgical lime and the iron scale for 0.5-2 hours to obtain a mixture;
(2) adding bentonite, fly ash and water into the mixture, and continuously stirring for 0.5-2h under a closed condition;
(3) and (3) pressing the product obtained in the step (2) into balls, and then piling and airing for 2-4 days.
The inventors of the present invention found in the course of their research that the strength of the return type blast furnace raw material produced by this specific production method (especially step (2)) is greater. Compared with the method of mixing the return fines, the metallurgical lime, the iron scale, the bentonite, the fly ash and the water together and then stirring under an open condition, the method of the invention can improve the strength by 0.7 wt%.
Preferably, said water is used in an amount of 1-3 wt.%, relative to the total amount of said mixture.
In the present invention, the product obtained in step (3) may be further processed conventionally, and those skilled in the art can freely select the product according to actual needs, which is not limited by the present invention.
The return mine type blast furnace raw material prepared by the method has the strength meeting the requirement of the blast furnace raw material. The invention does not need to increase the strength through sintering, saves energy, protects the environment, is mainly made of waste materials, is green and environment-friendly, and has the raw materials of the return-ore type blast furnace which are lower than the price of outsourcing sintered ore by about 80-100 yuan/ton, lower than the price of pellet ore by about 150 yuan/ton and lower than the price of non-lump ore by about 50 yuan/ton.
The present invention will be described in detail below by way of examples. In the following examples, the raw materials referred to are, unless otherwise indicated, commercial products in which the return ores (in which the FeO content is 8 wt.%), metallurgical lime (in which 85 wt.% CaO and 1 wt.% SiO are present)2) The iron scale (the content of iron element is 32 wt%) and the fly ash are all from Anyang iron and Steel group, Inc.
In the following examples, the compressive strength of the return type blast furnace raw material was measured according to GBT14201-2018, and the anti-decrepitation temperature of the return type blast furnace raw material was measured according to YB/T4117.
Example 1
(1) Dividing the return fine raw materials into three parts, respectively grinding the three parts to ensure that the average grain size of the first part of the return fine is 200-500 mu m, the average grain size of the second part of the return fine is 60-100mm, and the average grain size of the third part of the return fine is 2-4mm, and then mixing the two parts;
mixing and stirring 50g of the mixed return ores, 3g of metallurgical lime and 25g of iron scale for 1 hour to obtain a mixture;
(2) adding 10g of bentonite, 2g of fly ash and 2g of water into the mixture, and continuously stirring for 1h under a closed condition;
(3) and (3) pressing the product obtained in the step (2) into balls, and then stacking and airing the balls for 3 days to prepare the spherical return mine type blast furnace raw material.
The amounts of the respective raw materials used in the above process are also shown in Table 1, and the results of the compressive strength and blast temperature test of the return type blast furnace raw material are shown in Table 2.
Example 2
(1) Dividing the return fine raw materials into three parts, respectively grinding the three parts to ensure that the average grain size of the first part of the return fine is 200-500 mu m, the average grain size of the second part of the return fine is 60-100mm, and the average grain size of the third part of the return fine is 2-4mm, and then mixing the two parts;
mixing and stirring 55g of the mixed return ores, 2g of metallurgical lime and 20g of iron scale for 1 hour to obtain a mixture;
(2) adding 9g of bentonite, 3g of fly ash and 2g of water into the mixture, and continuously stirring for 1 hour under a closed condition;
(3) and (3) pressing the product obtained in the step (2) into balls, and then stacking and airing the balls for 3 days to prepare the spherical return mine type blast furnace raw material.
The amounts of the respective raw materials used in the above process are also shown in Table 1, and the results of the compressive strength and blast temperature test of the return type blast furnace raw material are shown in Table 2.
Example 3
(1) Dividing the return fine raw materials into three parts, respectively grinding the three parts to ensure that the average grain size of the first part of the return fine is 200-500 mu m, the average grain size of the second part of the return fine is 60-100mm, and the average grain size of the third part of the return fine is 2-4mm, and then mixing the two parts;
mixing and stirring 50g of the mixed return ores, 2g of metallurgical lime and 25g of iron scale for 1 hour to obtain a mixture;
(2) adding 9g of bentonite, 3g of fly ash and 3g of water into the mixture, and continuously stirring for 1h under a closed condition;
(3) and (3) pressing the product obtained in the step (2) into balls, and then stacking and airing the balls for 3 days to prepare the spherical return mine type blast furnace raw material.
The amounts of the respective raw materials used in the above process are also shown in Table 1, and the results of the compressive strength and blast temperature test of the return type blast furnace raw material are shown in Table 2.
Example 4
(1) Dividing the return fine raw materials into three parts, respectively grinding the three parts to ensure that the average grain size of the first part of the return fine is 200-500 mu m, the average grain size of the second part of the return fine is 60-100mm, and the average grain size of the third part of the return fine is 2-4mm, and then mixing the two parts;
mixing and stirring 60g of the mixed return ores, 5g of metallurgical lime and 30g of iron scale for 1 hour to obtain a mixture;
(2) adding 13g of bentonite, 4g of fly ash and 2g of water into the mixture, and continuously stirring for 1 hour under a closed condition;
(3) and (3) pressing the product obtained in the step (2) into balls, and then stacking and airing the balls for 3 days to prepare the spherical return mine type blast furnace raw material.
The amounts of the respective raw materials used in the above process are also shown in Table 1, and the results of the compressive strength and blast temperature test of the return type blast furnace raw material are shown in Table 2.
Example 5
(1) Dividing the return fine raw materials into three parts, respectively grinding the three parts to ensure that the average grain size of the first part of the return fine is 200-500 mu m, the average grain size of the second part of the return fine is 60-100mm, and the average grain size of the third part of the return fine is 2-4mm, and then mixing the two parts;
mixing and stirring 58g of the mixed return ores, 4g of metallurgical lime and 30g of iron scale for 1 hour to obtain a mixture;
(2) adding 10g of bentonite, 4g of fly ash and 3g of water into the mixture, and continuously stirring for 1h under a closed condition;
(3) and (3) pressing the product obtained in the step (2) into balls, and then stacking and airing the balls for 3 days to prepare the spherical return mine type blast furnace raw material.
The amounts of the respective raw materials used in the above process are also shown in Table 1, and the results of the compressive strength and blast temperature test of the return type blast furnace raw material are shown in Table 2.
Example 6
The procedure of example 1 was followed and corresponding tests were carried out, except that the return ores consisted of only one portion and had an average particle size of 60 to 100 mm.
Example 7
The procedure of example 1 was followed and corresponding tests were carried out, except that the return ores consisted of only one portion and had an average particle size of 2-4 mm.
Comparative example 1
The procedure of example 1 was followed and the corresponding tests carried out, except that no metallurgical lime was added.
Comparative example 2
The procedure of example 1 was followed and the corresponding tests were carried out, except that no scale was added.
Comparative example 3
The procedure of example 1 was followed and the corresponding tests were carried out, except that no fly ash was added.
Comparative example 4
The procedure is as in example 1, and the corresponding tests are carried out, except that the raw materials are mixed together and stirred for 1h, and then stirring is continued for 1h in open conditions (i.e. not closed).
TABLE 1
Note: the amount of the water is the mass percentage of the water relative to the total amount of the return ores, the metallurgical lime and the iron scales.
TABLE 2
As can be seen from the results of tables 1 and 2, the examples of the present invention have significantly better effects.
The comparative examples are not prior art, but are provided only for the purpose of demonstrating the effects of the present invention, and are not intended to limit the present invention.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (10)
1. The return-ore blast furnace raw material is characterized by comprising the following components in parts by weight: 50-60 parts of return ores, 1-6 parts of metallurgical lime, 20-35 parts of iron scales, 9-13 parts of bentonite and 2-4 parts of fly ash.
2. The return-ore type blast furnace raw material according to claim 1, wherein the return-ore is divided into three parts, the first part has an average particle size of 200-500 μm, the second part has an average particle size of 60-100mm, and the third part has an average particle size of 2-4 mm.
3. The return type blast furnace raw material according to claim 1 or 2, wherein the return ore comprises 6 to 9wt% of FeO.
4. The return-ore type blast furnace raw material according to claim 1 or 2, wherein the metallurgical lime includes CaO and SiO2The content of CaO is more than or equal to 80wt%, and SiO is2The content of (B) is less than or equal to 2 wt%.
5. The return-ore type blast furnace raw material according to claim 4, wherein the metallurgical lime includes CaO and SiO2The content of CaO is 80-85wt%, and SiO2The content of (B) is 1-2 wt%.
6. The return type blast furnace raw material according to claim 1 or 2, wherein the iron scale is iron scrap generated from a steel mill and/or a steel mill.
7. The return-ore type blast furnace raw material according to claim 6, wherein the content of iron element in the iron scale is not less than 30 wt%.
8. The return-ore type blast furnace raw material according to claim 1 or 2, wherein the fly ash is a metallurgical-industry-produced fly ash.
9. The method for producing a return type blast furnace raw material according to any one of claims 1 to 8, characterized by comprising the steps of:
(1) mixing and stirring the return ores, the metallurgical lime and the iron scale for 0.5-2 hours to obtain a mixture;
(2) adding bentonite, fly ash and water into the mixture, and continuously stirring for 0.5-2h under a closed condition;
(3) and (3) pressing the product obtained in the step (2) into balls, and then piling and airing for 2-4 days.
10. The preparation method according to claim 9, wherein the water is used in an amount of 1-3wt% with respect to the total amount of the mixture.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011214998.7A CN112430694A (en) | 2020-11-04 | 2020-11-04 | Return-ore type blast furnace raw material and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113186391A (en) * | 2021-04-01 | 2021-07-30 | 首钢京唐钢铁联合有限责任公司 | Pellet and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007302956A (en) * | 2006-05-12 | 2007-11-22 | Jfe Steel Kk | Nonfired agglomerated ore for iron manufacture |
| CN110724774A (en) * | 2019-09-26 | 2020-01-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for smelting vanadium-titanium magnetite concentrate in blast furnace |
-
2020
- 2020-11-04 CN CN202011214998.7A patent/CN112430694A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007302956A (en) * | 2006-05-12 | 2007-11-22 | Jfe Steel Kk | Nonfired agglomerated ore for iron manufacture |
| CN110724774A (en) * | 2019-09-26 | 2020-01-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for smelting vanadium-titanium magnetite concentrate in blast furnace |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113186391A (en) * | 2021-04-01 | 2021-07-30 | 首钢京唐钢铁联合有限责任公司 | Pellet and preparation method thereof |
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