CN114959168B - Process for smelting low micro-carbon manganese-silicon alloy by closed electric furnace - Google Patents
Process for smelting low micro-carbon manganese-silicon alloy by closed electric furnace Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000003723 Smelting Methods 0.000 title claims abstract description 29
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 24
- 230000008569 process Effects 0.000 title claims abstract description 21
- 229910000676 Si alloy Inorganic materials 0.000 title claims abstract description 19
- PYLLWONICXJARP-UHFFFAOYSA-N manganese silicon Chemical compound [Si].[Mn] PYLLWONICXJARP-UHFFFAOYSA-N 0.000 title abstract description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000002893 slag Substances 0.000 claims abstract description 20
- 239000000571 coke Substances 0.000 claims abstract description 12
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 10
- 239000002994 raw material Substances 0.000 claims abstract description 9
- XTZVWOPRWVJODK-UHFFFAOYSA-N [Si].[Mn].[C] Chemical compound [Si].[Mn].[C] XTZVWOPRWVJODK-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910045601 alloy Inorganic materials 0.000 claims description 40
- 239000000956 alloy Substances 0.000 claims description 40
- 239000011572 manganese Substances 0.000 claims description 37
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 23
- 229910052748 manganese Inorganic materials 0.000 claims description 23
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 17
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 8
- 238000007667 floating Methods 0.000 claims description 6
- 206010039897 Sedation Diseases 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 230000036280 sedation Effects 0.000 claims description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 3
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 2
- MQMHJMFHCMWGNS-UHFFFAOYSA-N phosphanylidynemanganese Chemical compound [Mn]#P MQMHJMFHCMWGNS-UHFFFAOYSA-N 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 abstract description 6
- 238000011161 development Methods 0.000 abstract description 5
- 238000010079 rubber tapping Methods 0.000 abstract description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 3
- 229910000640 Fe alloy Inorganic materials 0.000 abstract description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 abstract description 3
- 239000001569 carbon dioxide Substances 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 230000007774 longterm Effects 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 3
- 238000012797 qualification Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 238000011112 process operation Methods 0.000 abstract description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 5
- 229910052710 silicon Inorganic materials 0.000 description 5
- 239000010703 silicon Substances 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 4
- 229910018643 Mn—Si Inorganic materials 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- VLTRZXGMWDSKGL-UHFFFAOYSA-N perchloric acid Chemical compound OCl(=O)(=O)=O VLTRZXGMWDSKGL-UHFFFAOYSA-N 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 238000004448 titration Methods 0.000 description 2
- 229910001021 Ferroalloy Inorganic materials 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
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- 230000006378 damage Effects 0.000 description 1
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- 239000000428 dust Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
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- 230000003647 oxidation Effects 0.000 description 1
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- AMWVZPDSWLOFKA-UHFFFAOYSA-N phosphanylidynemolybdenum Chemical compound [Mo]#P AMWVZPDSWLOFKA-UHFFFAOYSA-N 0.000 description 1
- 238000005375 photometry Methods 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/52—Manufacture of steel in electric furnaces
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C35/00—Master alloys for iron or steel
-
- 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)
- Materials Engineering (AREA)
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- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
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- Manufacture And Refinement Of Metals (AREA)
- Silicon Compounds (AREA)
Abstract
The invention discloses a process for smelting low-micro carbon manganese-silicon alloy by a closed electric furnace, which comprises S1, smelting by the closed electric furnace and tapping operation. The invention realizes the effect of no need of adjusting the working condition in the furnace in the middle of the smelting process by reasonable raw material collocation, adjustment of relevant parameters calculated by coke silica, mastering of the dosage, slag alkalinity, furnace front process operation and other aspects of control, has no phenomena of material collapse, slag turning and fire ignition, has stable production, ensures the stability, long-term property, economy and qualification rate of the process for producing the low micro-carbon manganese-silicon alloy by the closed electric furnace, and makes beneficial attempts for the development of the whole industry. The invention adopts the closed electric furnace to produce the low micro-carbon manganese silicon alloy, and carbon monoxide gas and carbon dioxide gas generated in the smelting process are collected, treated and utilized, thereby meeting the requirements of national environmental protection policy and the requirements of green high quality development of iron alloy industry policy.
Description
Technical field:
the invention relates to a low micro-carbon manganese-silicon alloy process, in particular to a process for smelting low micro-carbon manganese-silicon alloy by a closed electric furnace.
The background technology is as follows:
the mass percentage of silicon in the common manganese silicon alloy produced by the closed electric furnace is 17% -21%, the mass percentage of silicon in the low micro-carbon manganese silicon alloy is increased to 25% -30%, the silicon needs to be reduced to the brand requirement by adding excessive carbon, the total mass percentage of carbon in the added raw materials needs to reach 28% -32%, the excessive carbon can cause the coke content in the furnace burden to be higher, the conductivity of coke is improved in a high-temperature state, and therefore the electrode is required to be lifted up to ensure the electrode to transmit electricity, thereby greatly increasing the temperature of the furnace surface, reducing the temperature of the furnace bottom, continuously increasing the slag surface of the furnace bottom, influencing normal smelting, unstable product quality, increasing the cost and being difficult for high-temperature operation of the worker furnace surface.
And for various reasons, the smelting of the low-micro carbon manganese-silicon alloy in the industry currently adopts semi-closed electric furnace tissue production. Because:
(1) the semi-closed electric furnace can intuitively observe the running condition in the furnace at the first time, so that the targeted treatment and adjustment are correctly carried out according to the condition in the furnace.
(2) According to the conditions in the furnace, additional raw materials such as silica, coke, slag former and the like can be conveniently and directly added into the high-temperature reaction zone in the furnace manually, so that the furnace condition is rapidly treated, and the stable operation of the electric furnace and the stability of components are ensured.
(3) The surface of the furnace is provided with workers to perform pushing operation, so that the surface raw materials can be pushed to a high-temperature smelting area in the furnace in time, the smelting temperature is ensured, and the high thermal efficiency of the electric furnace and the stability of alloy components are ensured.
However, due to the production mode of the semi-closed electric furnace equipment, the following defects are unavoidable:
(1) the open or semi-closed electric furnace is liable to generate serious carbon dioxide emission in the smelting process, and the process is obviously not suitable for the requirements of environmental protection policies.
(2) The enlargement and sealing of the electric furnace are the necessary trend of the development of the ferroalloy industry, and all varieties are also developed towards the sealing of the electric furnace.
(3) The semi-closed electric furnace is adopted for production, workers are required to perform pushing operation on the furnace surface, the site is high in temperature, dust and noise are large, and the labor environment is bad.
(4) The electric furnace has the risk of flaming and material collapse, and personal injury accidents are easy to occur.
In the past, related enterprises have tried to produce low-micro carbon manganese silicon alloy by adopting a closed electric furnace, but the furnace condition is difficult to control because of the requirements of higher reaction temperature, silica coke adding amount and lower impurity elements, meanwhile, the closed electric furnace cannot observe the condition in the furnace in time like a semi-closed electric furnace, so that the conditions of large furnace condition change, low finished product qualification rate, frequent blockage of a flue and the like occur, long-term stable production cannot be ensured, and industrial production is not realized.
The invention comprises the following steps:
in order to solve the technical problems, the invention aims to provide a process for smelting low-micro carbon manganese-silicon alloy by a closed electric furnace, which adopts specific technical conditions and operation steps to realize stable and smooth production of the closed electric furnace and ensure that the furnace condition and the product percent of pass meet the requirements.
The invention is implemented by the following technical scheme:
the process for smelting the low-micro carbon manganese-silicon alloy by using the closed electric furnace comprises the following steps of:
s1, smelting in a closed electric furnace: smelting furnace burden in a continuous charging mode in a closed electric furnace, wherein the furnace burden comprises the following components:
25 to 30% by weight of a first high manganese ore containing 43 to 45% by weight of Mn, 7 to 10% by weight of Si, 4% by weight of Fe, 0.06% by weight of P, 0.04% by weight of S, 1 to 3% by weight of Ca and 6% by weight of Al;
30 to 35% by weight of a second high manganese ore containing 33 to 35% by weight of Mn, 4 to 6% by weight of Si, less than or equal to 6% by weight of Fe, less than or equal to 0.02% by weight of P, less than or equal to 0.04% by weight of S, 15 to 18% by weight of Ca and less than or equal to 1% by weight of Al;
25 to 30% by weight of a third high manganese ore containing 38 to 40% by weight of Mn, 20 to 22% by weight of Si, +.3% by weight of Fe, +.0.02% by weight of P, +.0.07% by weight of S, 4 to 6% by weight of Ca and+.8% by weight of Al;
5 to 10% by weight of a fourth high manganese ore containing 15 to 20% by weight of Mn, 25 to 28% by weight of Si, 1% by weight of Fe, 0.02% by weight of P, 0.02% by weight of S, 30 to 35% by weight of Ca and 2% by weight of Al;
in the above high manganese ore, the Mn content is calculated as Mn and the Si content is calculated as SiO 2 Content of Ca calculated as CaO and content of Al calculated as Al 2 O 3 Counting;
the balance being coke and silica;
s2, discharging: taking out one furnace every 3-4 hours, and after the closed electric furnace is taken out for one time, carrying out a first step of slag skimming operation on the alloy in the ladle, and completely skimming the slag on the alloy liquid surface; then, beginning the sedation process, and standing the molten iron in the ladle for 10-15 minutes; carrying out slag skimming operation again, and skimming out a high carbon layer floating on the alloy liquid surface; starting alloy pouring, and pushing out the high-carbon layer floating on the surface of the alloy again by using a pushing rake after the ingot mould is filled with the alloy; and then cooling and solidifying the alloy.
Further, in S1 closed electric furnace smelting, the manganese-iron ratio of the raw materials fed into the furnace is controlled to be 10-13, and the phosphorus-manganese ratio is controlled to be less than 0.00095.
Further, in S1 closed electric furnace smelting, the ternary alkalinity of slag is controlled to be between 0.6 and 0.7.
Further, in S1 closed electric furnace smelting, the power density of the unit polar center circle is controlled to be 2000-2200 KVA/m 2 The method comprises the steps of carrying out a first treatment on the surface of the The electrode inserting depth is 1700-2100 mm; the secondary current is 10-11.5 WA, and the natural power factor cos phi is 0.55-0.7.
Further, in S1 closed electric furnace smelting, the hearth diameter of the closed electric furnace is 9000-10000mm; the depth of the hearth is 3200-3400mm; the diameter of the electrode is 1400-1550mm; the diameter of the polar circle is 4200-4500mm.
The invention has the advantages that:
1. the invention realizes the effect of no need of adjusting the working condition in the furnace in the middle of the smelting process by reasonable raw material collocation, adjustment of relevant parameters calculated by coke silica, mastering of the dosage, slag alkalinity, furnace front process operation and other aspects of control, has no phenomena of material collapse, slag turning and fire ignition, has stable production, ensures the stability, long-term property, economy and qualification rate of the process for producing the low micro-carbon manganese-silicon alloy by the closed electric furnace, and makes beneficial attempts for the development of the whole industry.
2. According to the invention, the low micro-carbon manganese silicon alloy is produced by adopting the closed electric furnace, and carbon monoxide gas and carbon dioxide gas generated in the smelting process are collected, treated and utilized, so that the problems of severe working environment, environment protection, substandard standard and the like caused by the disordered emission of the flue gas produced by adopting the open or semi-closed electric furnace in the prior art are avoided, and the requirements of national environmental protection policies and the green high-quality development requirements of the iron alloy industry policies are met.
The specific embodiment is as follows:
the following description of the embodiments of the present invention will be made clearly and completely, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled 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.
The following examples were carried out in a certain iron alloy factory in the city of inner mongolia, all parameters of the closed electric furnace being: the diameter of the hearth is 10000mm; the depth of the hearth is 3300mm; the diameter of the electrode is 1500mm; the polar circle diameter is 4300mm.
The high manganese ores used in the examples were four high manganese ores in the plant, and the compositions of the four high manganese ores are shown in Table 1. Both examples are intended to produce low micro carbon manganese silicon alloys with the designation FeMn60Si 28.
TABLE 1 high manganese ore Cheng Fenbiao
| Mn(％) | SiO 2 (％) | Fe(％) | P(％) | S(％) | CaO(％) | Al 2 O 3 (％) | |
| First high manganese ore | 43.5 | 8.9 | 1.2％ | 0.015 | 0.03 | 17.2 | 5.2 |
| Second high manganese ore | 34.3 | 5.3 | 1.5 | 0.013 | 0.02 | 16.2 | 0.9 |
| Third highest manganese ore | 38.2 | 21.8 | 2.6 | 0.015 | 0.05 | 5.3 | 6.8 |
| Fourth high manganese ore | 18.7 | 26.6 | 0.9 | 0.016 | 0.01 | 33.6 | 1.4 |
Example 1:
smelting furnace burden in a closed electric furnace in a continuous feeding mode, wherein the furnace burden is regulated according to the brand of FeMn60Si28, and the raw materials comprise high manganese ore, coke and silica,
the ratio of the four manganese ores to the coke to the silica is 25:25:35:7:4:4, and the unit polar circle power density is controlled to be 2100KVA/m 2 The method comprises the steps of carrying out a first treatment on the surface of the The electrode inserting depth is 2000mm; the secondary current is about 11 ten thousand, and the natural power factor cos phi is 0.6;
tapping in 3.5 hours, poking open and closing a furnace hole at the bottom of the electric furnace, enabling alloy to flow into a ladle from an opening at the bottom of the furnace, performing a first step of slag skimming operation on the alloy in the ladle after tapping, and completely skimming slag on the alloy liquid surface; then, beginning the sedation process, and standing the molten iron in the ladle for 15 minutes; carrying out slag skimming operation again, and skimming out a high carbon layer with the thickness of about 1mm, wherein the alloy liquid surface floats upwards; starting alloy pouring, and pushing out the high carbon layer with the thickness of about 1mm floating on the surface of the alloy again by using a pushing rake after the ingot mould is filled with the alloy; and then cooling and solidifying the alloy, and crushing to obtain an alloy block product.
Example 2:
smelting furnace burden in a closed electric furnace in a continuous feeding mode, wherein the furnace burden is regulated according to the brand of FeMn60Si28, and the raw materials comprise high manganese ore, coke and silica,
the ratio of the four manganese ores to the coke to the silica is 30:30:30:5:2:3, and the unit polar circle power density is controlled to be 2100KVA/m 2 The method comprises the steps of carrying out a first treatment on the surface of the The electrode inserting depth is 2000mm; the secondary current is about 11 ten thousand, and the natural power factor cos phi is 0.6;
tapping the alloy from the furnace for 4 hours, poking open and closing a furnace hole at the bottom of the electric furnace, allowing the alloy to flow into a ladle from an opening at the bottom of the furnace, performing a first step of slag skimming operation on the alloy in the ladle after tapping, and completely skimming slag on the alloy liquid surface; then, beginning the sedation process, and standing the molten iron in the ladle for 15 minutes; carrying out slag skimming operation again, and skimming out a high carbon layer with the thickness of about 1mm, wherein the alloy liquid surface floats upwards; starting alloy pouring, and pushing out the high carbon layer with the thickness of about 1mm floating on the surface of the alloy again by using a pushing rake after the ingot mould is filled with the alloy; and then cooling and solidifying the alloy, and crushing to obtain an alloy block product.
The alloy blocks produced in examples 1 and 2 were sampled and analyzed as follows:
selecting 5-7 block samples with the maximum granularity less than or equal to 100mm from the alloy block products obtained by crushing in a manual random picking mode, crushing the block samples with the granularity less than or equal to 10mm by adopting a jaw crusher, dividing the crushed samples by using a quartering method, selecting about 8kg of divided samples, crushing the divided samples with the granularity less than or equal to 2.8mm by adopting the jaw crusher again, continuously dividing the divided samples by using the quartering method, selecting about 2kg of divided samples, grinding the divided samples with a roller crusher to the granularity less than or equal to 1.0mm, dividing the divided samples by using the quartering method, selecting about 400 g of samples, grinding the samples in a grinding machine until the granularity less than or equal to 0.125mm, subpackaging the samples, weighing about 50 g, and conveying the samples to an assay for analysis.
Five elements of manganese, silicon, phosphorus, carbon and sulfur were analyzed by a national standard method of low-micro-carbon manganese-silicon alloy (manganese: perchloric acid oxidation titration method, silicon: potassium fluosilicate titration method, phosphorus: phosphorus-molybdenum blue photometry method, C, S: infrared absorption method), and the analysis results are shown in table 2:
table 2 alloy block sample analysis table
| Mn(％) | Si(％) | C(％) | P(％) | S(％) | |
| Example 1 | 61.98 | 28.66 | 0.069 | 0.066 | 0.010 |
| Example 2 | 61.31 | 29.07 | 0.082 | 0.076 | 0.012 |
From the analysis of Table 2, the alloy products produced by using examples 1 and 2 are low micro carbon Mn-Si alloy, which meets the requirements of high Si-Mn-Si alloy grade FeMn60Si 28.
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 (2)
1. The process for smelting the low-micro carbon manganese-silicon alloy by the closed electric furnace is characterized by comprising the following steps of:
s1, smelting in a closed electric furnace: smelting furnace burden in a continuous feeding mode in a closed electric furnace, and controlling the ternary alkalinity of slag to be between 0.6 and 0.7, wherein the furnace burden comprises the following components:
25 to 30% by weight of a first high manganese ore containing 43 to 45% by weight of Mn, 7 to 10% by weight of Si, 4% by weight of Fe, 0.06% by weight of P, 0.04% by weight of S, 1 to 3% by weight of Ca and 6% by weight of Al;
30 to 35% by weight of a second high manganese ore containing 33 to 35% by weight of Mn, 4 to 6% by weight of Si, less than or equal to 6% by weight of Fe, less than or equal to 0.02% by weight of P, less than or equal to 0.04% by weight of S, 15 to 18% by weight of Ca and less than or equal to 1% by weight of Al;
25 to 30% by weight of a third high manganese ore containing 38 to 40% by weight of Mn, 20 to 22% by weight of Si, +.3% by weight of Fe, +.0.02% by weight of P, +.0.07% by weight of S, 4 to 6% by weight of Ca and+.8% by weight of Al;
5 to 10% by weight of a fourth high manganese ore containing 15 to 20% by weight of Mn, 25 to 28% by weight of Si, 1% by weight of Fe, 0.02% by weight of P, 0.02% by weight of S, 30 to 35% by weight of Ca and 2% by weight of Al;
in the above high manganese ore, the Mn content is calculated as Mn and the Si content is calculated as SiO 2 Content of Ca calculated as CaO and content of Al calculated as Al 2 O 3 Counting;
the balance being coke and silica;
the diameter of a hearth of the closed electric furnace is 9000-10000mm; the depth of the hearth is 3200-3400mm; the diameter of the electrode is 1400-1550mm; the diameter of the polar circle is 4200-4500mm; the power density of the polar center circle of the control unit is 2000-2200 KVA/m 2 The method comprises the steps of carrying out a first treatment on the surface of the The electrode inserting depth is 1700-2100 mm; secondary current is 10-11.5 WA, and natural power factor cos phi is 0.55-0.7;
s2, discharging: taking out one furnace every 3-4 hours, and after the closed electric furnace is taken out for one time, carrying out a first step of slag skimming operation on the alloy in the ladle, and completely skimming the slag on the alloy liquid surface; then, beginning the sedation process, and standing the molten iron in the ladle for 10-15 minutes; carrying out slag skimming operation again, and skimming out a high carbon layer floating on the alloy liquid surface; starting alloy pouring, and pushing out the high-carbon layer floating on the surface of the alloy again by using a pushing rake after the ingot mould is filled with the alloy; and then cooling and solidifying the alloy.
2. The process for smelting low-micro carbon manganese-silicon alloy by a closed electric furnace according to claim 1, wherein in S1 closed electric furnace smelting, the manganese-iron ratio of the raw materials fed into the furnace is controlled to be between 10 and 13, and the phosphorus-manganese ratio is controlled to be below 0.00095.
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| CN103526066A (en) * | 2013-11-01 | 2014-01-22 | 中钢集团吉林铁合金股份有限公司 | Continuous process for producing manganese-silicon alloy and slag rich in silicomanganese and producing micro-and low-carbon manganese-silicon alloy by utilization of slag rich in silicomanganese |
| CN106399782A (en) * | 2016-09-07 | 2017-02-15 | 朱晓明 | High-silicon silicon manganese alloy and production method thereof |
| CN113564359A (en) * | 2021-07-27 | 2021-10-29 | 中冶东方工程技术有限公司 | Manganese-silicon alloy smelting device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103526066A (en) * | 2013-11-01 | 2014-01-22 | 中钢集团吉林铁合金股份有限公司 | Continuous process for producing manganese-silicon alloy and slag rich in silicomanganese and producing micro-and low-carbon manganese-silicon alloy by utilization of slag rich in silicomanganese |
| CN106399782A (en) * | 2016-09-07 | 2017-02-15 | 朱晓明 | High-silicon silicon manganese alloy and production method thereof |
| CN113564359A (en) * | 2021-07-27 | 2021-10-29 | 中冶东方工程技术有限公司 | Manganese-silicon alloy smelting device and method |
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