CN117947265B - Production method of metallized pellets - Google Patents
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- CN117947265B CN117947265B CN202410353454.0A CN202410353454A CN117947265B CN 117947265 B CN117947265 B CN 117947265B CN 202410353454 A CN202410353454 A CN 202410353454A CN 117947265 B CN117947265 B CN 117947265B
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- metallized pellets
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- 239000008188 pellet Substances 0.000 title claims abstract description 92
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 29
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 79
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims abstract description 56
- 239000001257 hydrogen Substances 0.000 claims abstract description 38
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 38
- 229910052742 iron Inorganic materials 0.000 claims abstract description 38
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 28
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 28
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 25
- 239000000843 powder Substances 0.000 claims abstract description 22
- 239000011230 binding agent Substances 0.000 claims abstract description 17
- 238000002156 mixing Methods 0.000 claims abstract description 13
- 238000003825 pressing Methods 0.000 claims abstract description 13
- 238000002485 combustion reaction Methods 0.000 claims abstract description 8
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 13
- 239000000440 bentonite Substances 0.000 claims description 13
- 229910000278 bentonite Inorganic materials 0.000 claims description 13
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 13
- 239000005011 phenolic resin Substances 0.000 claims description 13
- 229920001568 phenolic resin Polymers 0.000 claims description 13
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 12
- 239000000920 calcium hydroxide Substances 0.000 claims description 12
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 12
- UPKIHOQVIBBESY-UHFFFAOYSA-N magnesium;carbanide Chemical compound [CH3-].[CH3-].[Mg+2] UPKIHOQVIBBESY-UHFFFAOYSA-N 0.000 claims description 12
- 239000012141 concentrate Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000001465 metallisation Methods 0.000 abstract description 18
- 229910000831 Steel Inorganic materials 0.000 abstract description 3
- 239000010959 steel Substances 0.000 abstract description 3
- 238000003723 Smelting Methods 0.000 abstract description 2
- 238000006722 reduction reaction Methods 0.000 description 13
- 230000000052 comparative effect Effects 0.000 description 12
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 238000004134 energy conservation Methods 0.000 description 4
- KMUONIBRACKNSN-UHFFFAOYSA-N potassium dichromate Chemical compound [K+].[K+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O KMUONIBRACKNSN-UHFFFAOYSA-N 0.000 description 4
- 239000003638 chemical reducing agent Substances 0.000 description 3
- 229910052595 hematite Inorganic materials 0.000 description 3
- 239000011019 hematite Substances 0.000 description 3
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical group [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 235000013980 iron oxide Nutrition 0.000 description 2
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 238000004448 titration Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- KALQHVHFDXUHMO-UHFFFAOYSA-M sodium fluoride hydrochloride Chemical compound [F-].[Na+].Cl KALQHVHFDXUHMO-UHFFFAOYSA-M 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- YONPGGFAJWQGJC-UHFFFAOYSA-K titanium(iii) chloride Chemical compound Cl[Ti](Cl)Cl YONPGGFAJWQGJC-UHFFFAOYSA-K 0.000 description 1
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
-
- 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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- 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 relates to the technical field of steel smelting, and provides a production method of metallized pellets, which comprises the following steps: s1, uniformly mixing iron fine powder, a binder and an auxiliary agent, and pressing to obtain pellets; the auxiliary agent comprises magnesium oxide and barium sulfate; s2, carrying out hydrogen combustion reduction treatment on the pellets to obtain metallized pellets. Through the technical scheme, the problem that the metallization rate of the metallized pellets in the prior art is not high is solved.
Description
Technical Field
The invention relates to the technical field of steel smelting, in particular to a production method of metallized pellets.
Background
The metallized pellets are pellets obtained by pre-reducing green pellets or pellets subjected to oxidative roasting in a reduction device by using a solid or gas reducing agent to remove the oxygen content of iron oxides in the iron ores, so that most of iron oxides are converted into metallic iron pellets. With the shortage of global ore resources and the increasing of the social demand for iron ore resources, the metallized pellets are used as a substitute, and the demand space is greatly expanded.
At present, the production of the metallized pellets is generally realized by a carbonaceous reducing agent, but the production is not beneficial to energy conservation and emission reduction. The clean energy source such as hydrogen is utilized for production, and the method has become an important way for energy conservation and emission reduction of steel. At present, the production of metallized pellets by hydrogen has the problem of low metallization rate. Therefore, in order to improve the metallization rate of the metallized pellets while realizing energy conservation and emission reduction, the development of a novel production method of the metallized pellets has important significance.
Disclosure of Invention
The invention provides a production method of metallized pellets, which solves the problem that the metallization rate of metallized pellets is not high in the related art.
The technical scheme of the invention is as follows:
The invention provides a production method of metallized pellets, which comprises the following steps:
S1, uniformly mixing iron fine powder, a binder and an auxiliary agent, and pressing to obtain pellets;
The auxiliary agent comprises magnesium oxide and barium sulfate;
s2, carrying out hydrogen combustion reduction treatment on the pellets to obtain metallized pellets.
As a further technical scheme, the mass ratio of the magnesium oxide to the barium sulfate is 9-49:1.
When the mass ratio of the magnesium oxide to the barium sulfate is 9-49:1, the method is favorable for further improving the metallization rate of the metallized pellets.
As a further technical scheme, the mass ratio of the magnesium oxide to the barium sulfate is 9-19:1.
When the mass ratio of the magnesium oxide to the barium sulfate is 9-19:1, the metallization rate of the metallized pellets can be further improved.
As a further technical scheme, the auxiliary agent also comprises magnesium carbide.
In the auxiliary agent, the addition of the magnesium carbide can promote the forward movement of the reduction reaction when the iron-containing oxide in the iron concentrate is converted into metallic iron, thereby further improving the metallization rate of the metallized pellets.
As a further technical scheme, the mass ratio of the sum of the mass of the magnesium oxide and the mass of the barium sulfate to the mass of the magnesium carbide is 3:1-17:3.
When the mass ratio of the sum of the mass of the magnesium oxide and the mass of the barium sulfate to the mass of the magnesium carbide is 3:1-17:3, the method is favorable for further improving the metallization rate of the metallized pellets.
As a further technical scheme, the mass ratio of the iron concentrate to the binder to the auxiliary agent is 80-90:1:9.
As a further technical scheme, the iron content of the iron concentrate powder is more than or equal to 65wt%;
The water content of the iron concentrate powder is 2-5 wt%.
As a further technical scheme, the iron concentrate powder is hematite concentrate powder or magnetite concentrate powder, preferably hematite concentrate powder.
As a further technical scheme, the binder consists of bentonite, liquid phenolic resin and calcium hydroxide in a mass ratio of 5-7:2:1.
As a further technical scheme, in the step S2, the temperature is 600-900 ℃ and the time is 20-30 min during the hydrogen combustion reduction treatment.
As a further technical scheme, in the step S2, the hydrogen gas is introduced into the furnace at a concentration of 15-20L/min during the hydrogen gas combustion reduction treatment.
The invention also provides a metallized pellet produced by the production method.
The working principle and the beneficial effects of the invention are as follows:
According to the invention, by adding magnesium oxide and barium sulfate, the reduction degree of the pellets in the hydrogen combustion reduction treatment can be improved, and the conversion of iron-containing oxides in the iron concentrate to metal iron is promoted, so that the metallization rate of the metallized pellets is improved. In addition, compared with a carbonaceous reducing agent, the invention adopts hydrogen combustion reduction, thereby improving the metallization rate of the metal pellets and simultaneously achieving the effects of energy conservation and emission reduction.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the following examples and comparative examples, the fine iron powder was hematite powder having an iron content of 65% by weight and a water content of 3% by weight, unless otherwise specified; the particle size of the bentonite is 45 mu m; the liquid phenolic resin was type XT-101.
Example 1
A method for producing metallized pellets, comprising the steps of:
S1, uniformly mixing iron fine powder, a binder (composed of bentonite, liquid phenolic resin and calcium hydroxide with a mass ratio of 5:2:1) and an auxiliary agent (composed of magnesium oxide and barium sulfate with a mass ratio of 5:1) in a high-efficiency powerful stirrer according to a mass ratio of 80:1:9, and pressing by a high-pressure ball press to obtain pellets;
s2, feeding the pellets into a full-hydrogen shaft furnace, introducing hydrogen (the hydrogen inlet amount is 15L/min), and burning and reducing for 30min at 600 ℃ to obtain the metallized pellets.
Example 2
A method for producing metallized pellets, comprising the steps of:
S1, uniformly mixing iron fine powder, a binder (composed of bentonite, liquid phenolic resin and calcium hydroxide with the mass ratio of 7:2:1) and an auxiliary agent (composed of magnesium oxide and barium sulfate with the mass ratio of 5:1) in a high-efficiency powerful stirrer according to the mass ratio of 90:1:9, and pressing by a high-pressure ball press to obtain pellets;
s2, feeding the pellets into a full-hydrogen shaft furnace, introducing hydrogen (the hydrogen inlet amount is 20L/min), and burning and reducing for 20min at 900 ℃ to obtain the metallized pellets.
Example 3
A method for producing metallized pellets, comprising the steps of:
S1, uniformly mixing iron fine powder, a binder (composed of bentonite, liquid phenolic resin and calcium hydroxide with the mass ratio of 7:2:1) and an auxiliary agent (composed of magnesium oxide and barium sulfate with the mass ratio of 59:1) in a high-efficiency powerful stirrer according to the mass ratio of 90:1:9, and pressing by a high-pressure ball press to obtain pellets;
s2, feeding the pellets into a full-hydrogen shaft furnace, introducing hydrogen (the hydrogen inlet amount is 20L/min), and burning and reducing for 20min at 900 ℃ to obtain the metallized pellets.
Example 4
A method for producing metallized pellets, comprising the steps of:
S1, uniformly mixing iron fine powder, a binder (composed of bentonite, liquid phenolic resin and calcium hydroxide with the mass ratio of 7:2:1) and an auxiliary agent (composed of magnesium oxide and barium sulfate with the mass ratio of 9:1) in a high-efficiency powerful stirrer according to the mass ratio of 90:1:9, and pressing by a high-pressure ball press to obtain pellets;
s2, feeding the pellets into a full-hydrogen shaft furnace, introducing hydrogen (the hydrogen inlet amount is 20L/min), and burning and reducing for 20min at 900 ℃ to obtain the metallized pellets.
Example 5
A method for producing metallized pellets, comprising the steps of:
s1, uniformly mixing iron fine powder, a binder (composed of bentonite, liquid phenolic resin and calcium hydroxide with the mass ratio of 7:2:1) and an auxiliary agent (composed of magnesium oxide and barium sulfate with the mass ratio of 49:1) in a high-efficiency powerful stirrer according to the mass ratio of 90:1:9, and pressing by a high-pressure ball press to obtain pellets;
s2, feeding the pellets into a full-hydrogen shaft furnace, introducing hydrogen (the hydrogen inlet amount is 20L/min), and burning and reducing for 20min at 900 ℃ to obtain the metallized pellets.
Example 6
A method for producing metallized pellets, comprising the steps of:
S1, uniformly mixing iron fine powder, a binder (composed of bentonite, liquid phenolic resin and calcium hydroxide with the mass ratio of 7:2:1) and an auxiliary agent (composed of magnesium oxide and barium sulfate with the mass ratio of 19:1) in a high-efficiency powerful stirrer according to the mass ratio of 90:1:9, and pressing by a high-pressure ball press to obtain pellets;
s2, feeding the pellets into a full-hydrogen shaft furnace, introducing hydrogen (the hydrogen inlet amount is 20L/min), and burning and reducing for 20min at 900 ℃ to obtain the metallized pellets.
Example 7
A method for producing metallized pellets, comprising the steps of:
S1, uniformly mixing iron fine powder, a binder (composed of bentonite, liquid phenolic resin and calcium hydroxide with the mass ratio of 7:2:1) and an auxiliary agent (composed of magnesium oxide, barium sulfate and magnesium carbide with the mass ratio of 12.35:0.65:7) in a high-efficiency powerful mixer according to the mass ratio of 90:1:9, and pressing by a high-pressure ball press to obtain pellets;
s2, feeding the pellets into a full-hydrogen shaft furnace, introducing hydrogen (the hydrogen inlet amount is 20L/min), and burning and reducing for 20min at 900 ℃ to obtain the metallized pellets.
Example 8
A method for producing metallized pellets, comprising the steps of:
S1, uniformly mixing iron fine powder, a binder (composed of bentonite, liquid phenolic resin and calcium hydroxide with the mass ratio of 7:2:1) and an auxiliary agent (composed of magnesium oxide, barium sulfate and magnesium carbide with the mass ratio of 18.05:0.95:1) in a high-efficiency powerful mixer according to the mass ratio of 90:1:9, and pressing by a high-pressure ball press to obtain pellets;
s2, feeding the pellets into a full-hydrogen shaft furnace, introducing hydrogen (the hydrogen inlet amount is 20L/min), and burning and reducing for 20min at 900 ℃ to obtain the metallized pellets.
Example 9
A method for producing metallized pellets, comprising the steps of:
S1, uniformly mixing iron fine powder, a binder (composed of bentonite, liquid phenolic resin and calcium hydroxide with the mass ratio of 7:2:1) and an auxiliary agent (composed of magnesium oxide, barium sulfate and magnesium carbide with the mass ratio of 14.25:0.75:5) in a high-efficiency powerful mixer according to the mass ratio of 90:1:9, and pressing by a high-pressure ball press to obtain pellets;
s2, feeding the pellets into a full-hydrogen shaft furnace, introducing hydrogen (the hydrogen inlet amount is 20L/min), and burning and reducing for 20min at 900 ℃ to obtain the metallized pellets.
Example 10
A method for producing metallized pellets, comprising the steps of:
S1, uniformly mixing iron fine powder, a binder (composed of bentonite, liquid phenolic resin and calcium hydroxide with the mass ratio of 7:2:1) and an auxiliary agent (composed of magnesium oxide, barium sulfate and magnesium carbide with the mass ratio of 16.15:0.85:3) in a high-efficiency powerful mixer according to the mass ratio of 90:1:9, and pressing by a high-pressure ball press to obtain pellets;
s2, feeding the pellets into a full-hydrogen shaft furnace, introducing hydrogen (the hydrogen inlet amount is 20L/min), and burning and reducing for 20min at 900 ℃ to obtain the metallized pellets.
Comparative example 1
The comparative example differs from example 1 only in that in step S1 of the comparative example, the auxiliary agent is magnesium oxide.
Comparative example 2
The comparative example differs from example 1 only in that in step S1 of the comparative example, the auxiliary agent is barium sulfate.
Comparative example 3
The present comparative example differs from example 1 only in that no auxiliary agent was added in step S1 of the present comparative example.
The metallized pellets produced in examples 1 to 10 and comparative examples 1 to 3 were subjected to the following performance tests:
① Metallization ratio: measuring and calculating the total iron content by adopting a hydrochloric acid-sodium fluoride decomposition method according to GB/T6730.65-2009 method for determining the total iron content of iron ore by using a titanium trichloride reduction potassium dichromate titration method (conventional method), measuring and calculating the metal iron content according to GB/T38812.2-2020 method for determining the metal iron content of direct reduced iron by using a ferric trichloride decomposition potassium dichromate titration method, and calculating the metallization rate according to metallization rate (%) = metal iron content/total iron content multiplied by 100;
② Compressive strength: the compressive strength of the metallized pellets was tested using a microcomputer controlled electrohydraulic servo universal tester (model HUT 605D), which is an indication of the number recorded by the universal tester when pressed until the metallized pellets broke.
The detection results are shown in the following table 1.
TABLE 1 metallized pellet Performance test results
Comparison of example 1 and comparative examples 1-3 shows that the metallization rate of the metallized pellets can be significantly improved by adding magnesium oxide and barium sulfate. Comparison of examples 2-3 and examples 4-6 shows that when the mass ratio of magnesium oxide to barium sulfate is 9-49:1, the metallized pellet metallization rate is further improved. Comparison of the embodiment 5 with the embodiment 4 and the embodiment 6 shows that when the mass ratio of the magnesium oxide to the barium sulfate is 9-19:1, the metallization rate of the metallized pellets can be further improved. Comparison of example 6 and examples 7-10 shows that the addition of magnesium carbide in the auxiliary agent can further improve the metallization rate of the metallized pellets. Comparison of examples 9-10 and examples 7-8 shows that when the mass sum of magnesium oxide and barium sulfate and the mass ratio of magnesium carbide is 3:1-17:3, the metallized pellet metallization rate is further improved.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (8)
1. The production method of the metallized pellet is characterized by comprising the following steps of:
S1, uniformly mixing iron fine powder, a binder and an auxiliary agent, and pressing to obtain pellets;
The auxiliary agent comprises magnesium oxide and barium sulfate;
s2, carrying out hydrogen combustion reduction treatment on the pellets to obtain metallized pellets;
the mass ratio of the magnesium oxide to the barium sulfate is 9-49:1;
The mass ratio of the iron fine powder to the binder to the auxiliary agent is 80-90:1:9.
2. The production method of the metallized pellets according to claim 1, wherein the mass ratio of the magnesium oxide to the barium sulfate is 9-19:1.
3. The method of producing metallized pellets according to claim 1, wherein the auxiliary agent further comprises magnesium carbide.
4. The production method of the metallized pellets according to claim 3, wherein the mass ratio of the sum of the mass of the magnesium oxide and the mass of the barium sulfate to the mass of the magnesium carbide is 3:1-17:3.
5. The method for producing metallized pellets according to claim 1, wherein the iron content of the fine iron powder is not less than 65wt%;
The water content of the iron concentrate powder is 2-5 wt%.
6. The production method of the metallized pellets according to claim 1, wherein the binder comprises bentonite, liquid phenolic resin and calcium hydroxide in a mass ratio of 5-7:2:1.
7. The method for producing metallized pellets according to claim 1, wherein in the step S2, the hydrogen gas is introduced in an amount of 15 to 20l/min during the hydrogen gas combustion reduction treatment.
8. A metallized pellet produced by the production method of any one of claims 1 to 7.
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