CN112430755A - Process for smelting common silicon-manganese alloy and rapidly converting high-silicon-manganese alloy in submerged arc furnace - Google Patents
Process for smelting common silicon-manganese alloy and rapidly converting high-silicon-manganese alloy in submerged arc furnace Download PDFInfo
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Abstract
The invention discloses a process for smelting common silicon-manganese alloy and rapidly converting high-silicon-manganese alloy in a submerged arc furnace, belongs to the technical field of ferroalloy production, and particularly relates to a converting process among different varieties of silicon-manganese alloy, which aims to solve the problems of long transition period and more transition products in the process of converting common silicon-manganese alloy into high-silicon-manganese alloy and comprises the following steps: (1) preparing materials; (2) preparing before conversion; (3) adjusting the coke type; (4) 1 day before the conversion, ensuring that the high-silicon silicomanganese material can enter the submerged arc furnace at the same time; (5) the alkalinity of the slag in the transition period of the conversion is 1.1 times of that in the conventional smelting process; (6) tapping time is not less than 40 min; (7) and dephosphorizing outside the submerged arc furnace, and adding lime powder or fluorite powder when the liquid level of slag iron in the ladle reaches 1/3 until the P component in the high silicon-manganese alloy reaches the standard. The transition period of the conversion is shortened to be within one day, the alloy quality exchange rate is improved by more than 20%, the recovery rate is improved by about 2%, the transition products are few, and the various consumptions are greatly reduced.
Description
Technical Field
The invention discloses a process for smelting a common silicon-manganese alloy and rapidly converting a high-silicon-manganese alloy in a submerged arc furnace, belongs to the technical field of iron alloy production, and particularly relates to a process for converting different silicon-manganese alloys.
Background
The silicon-manganese alloy is an alloy consisting of manganese, silicon, iron, a small amount of carbon and other elements, and is an iron alloy with wide application and high yield. The manganese-silicon alloy is a compound deoxidizer commonly used for steel making, and is also a reducing agent for producing medium-low carbon ferromanganese and producing metal manganese by an electro-silicothermic method.
High silicon manganese, also called low silicon manganese. As distinguished by name from ordinary silicomanganese, first in the elemental composition: high silicon manganese generally contains high silicon (Si > 22%), and has low content of impurities such as Fe, C, P and the like (C < 0.5%, P < 0.15%).
The production process of the common silicon-manganese alloy comprises the following steps: manganese ore, silica, carbonaceous reducing agent (coke) and the like are weighed and proportioned in a batching station according to the process requirement, are uniformly mixed and then are added into an electric furnace through a feeding system, a distributing system and a discharging pipe to supply power for smelting. The electric furnace is used for continuous reduction smelting, and tapping is carried out intermittently at fixed time. And (3) casting a cast iron from the discharged molten iron, finishing, crushing and processing, then bulk loading or packaging the product for delivery, and performing water quenching treatment on a large amount of furnace slag.
The reducing electric furnace is the main smelting equipment of ferroalloy, and the main raw materials are ore and carbonaceous reducing agent. The ore containing silicon and manganese and the carbonaceous raw material are subjected to reduction reaction in an electric furnace under the action of arc discharge, and the energy required by heating and smelting the materials and the reaction is electric energy. After the raw materials are put into the furnace, the reduction reaction is carried out at the high temperature of more than 2000 ℃ in the electric furnace to obtain the product.
The main processes for smelting the common silicon-manganese alloy and the high-silicon-manganese alloy are approximately the same, and in the normal smelting process, the conventional conversion process is long in transition period, low in alloy quality exchange rate and poor in index. Meanwhile, in the smelting process, along with the rise of the furnace temperature, the reduction rate of silicon is improved, the alkalinity of furnace slag becomes an ascending trend, the temperature of a furnace body and the temperature of a furnace bottom are greatly increased, the erosion corrosion of a furnace eye is intensified, accidents such as the blockage of the furnace eye, the iron leakage during the furnace body burning and the like often occur, the safety production of the submerged arc furnace is seriously restricted, and meanwhile, the yield index and the quality are affected.
Disclosure of Invention
The invention aims to: provides a process for smelting high-silicon silicomanganese alloy by a submerged arc furnace, which aims to solve the problems of long transition period and more transition products in the process of smelting high-silicon silicomanganese alloy by using common silicomanganese.
The technical scheme adopted by the invention is as follows:
the process for smelting the common silicon-manganese alloy and rapidly converting the high-silicon-manganese alloy in the submerged arc furnace comprises the following steps of:
(1) preparing materials;
(2) preparation before conversion: adjusting the furnace condition of the submerged arc furnace 3 days before the conversion, inserting an electrode deeply, limiting the electrode at the middle and lower limit positions, increasing the carbon distribution amount, and increasing the furnace temperature of the submerged arc furnace, wherein the silicon content in the common silicon-manganese alloy is increased from 17.5% to more than 18.5%;
(3) adjusting the coke type: adding 48-52% of low-phosphorus coke into the ore-smelting furnace for circulation 1-2 days before the conversion according to the weight ratio, and reducing the weight ratio of the phosphorus content of the ordinary silicon alloy by 38-42% before the conversion;
(4) 1 day before conversion, reducing the storage amount of a manganese ore raw material bin to be within 40 percent, controlling the storage amount of a coke bin to be within 50 percent, ensuring that high-silicon-manganese materials can enter the submerged arc furnace simultaneously, reducing the smelting charge level of the submerged arc furnace 1.5-2.5 hours before the high-silicon-manganese materials are fed, reducing the smelting charge level to be 200-300mm below the furnace shell of the submerged arc furnace, and completely emptying the ordinary silicon materials in the furnace top furnace bin of the submerged arc furnace; (5) the alkalinity of the slag in the transition period of the conversion is 1.1 times of that in the conventional smelting process;
(6) opening a furnace eye to cast iron when the power consumption reaches 70% -75% of that of a single furnace, wherein the tapping time is not less than 40 min; the fine adjustment can be carried out according to the size of the submerged arc furnace, so that the slag iron is discharged in place to avoid slag boiling;
(7) and (3) dephosphorizing outside the submerged arc furnace, and manually adding lime powder or fluorite powder when the liquid level of slag iron in a ladle reaches 1/3 in the process of tapping iron by the submerged arc furnace until the P component in the high silicon-manganese alloy reaches the standard.
In the technical scheme of the application: the furnace condition before the conversion is adjusted, so that the silicon component of the common silicon-manganese alloy can be effectively improved, and conditions are created for converting high-silicon-manganese alloy; low-phosphorus coke is added in advance 1-2 days before the conversion, the phosphorus concentration in the furnace is diluted, the phosphorus content in the furnace burden is reduced to the maximum extent, and a foundation is laid for the phosphorus component of the alloy to reach the standard quickly; before the high-silicon-manganese-silicon material ratio is put into the furnace, the furnace top bin is emptied, and the charge level in the furnace is properly reduced, so that the high-silicon-manganese-silicon furnace charge directly enters the furnace for smelting, the conversion flow is shortened, and the charge entering into the smelting link is accelerated; the increase of the alkalinity of the slag in the transition period can relieve the tapping difficulty in the front of the furnace in the process of recarburizing and silicon extracting, shorten the tapping time, stabilize the production organization and reduce the labor intensity; the activity of a molten pool in the furnace can be improved by increasing the frequency of changing the furnace eye, and good thermodynamic and kinetic conditions are created for alloy reduction; the follow-up of the measure of protecting the iron from the furnace improves the guarantee for the temperature rise of the high silicon smelting, and ensures the safety of the furnace body during the smelting period; the transition period of the conversion is shortened to be within one day, the alloy quality exchange rate is improved by more than 20%, the recovery rate is improved by about 2%, the transition products are few, and the various consumptions are greatly reduced.
Preferably, in the step (1), the ingredients comprise 35-45 parts of low-phosphorus low-iron manganese ore, 45-50 parts of low-phosphorus high-alkalinity medium manganese ore, 10-15 parts of self-produced slag and 40-45 parts of coke ingredients, namely, 55-60 parts of low-phosphorus coke with the granularity of 20-40mm and 40-45 parts of chemical coke with the granularity of 10-30 mm.
More preferably, in the step (1), the burdening comprises 40 parts by weight of low-phosphorus low-iron manganese ore, 43 parts by weight of low-phosphorus high-alkalinity medium manganese ore, 12 parts by weight of self-produced slag, and 42 parts by weight of coke, namely 58 parts by weight of low-phosphorus coke with the granularity of 30mm and 42 parts by weight of chemical coke with the granularity of 20 mm.
Preferably, the low-phosphorus coke has a phosphorus content of 0.01% or less.
Preferably, the ingredients also comprise 10 to 15 parts of coke and 8 to 12 parts of silica according to the parts by weight.
More preferably, the ingredients are the first 100- > 150 batches of materials.
Preferably, the temperature of the submerged arc furnace in the step (2) is increased from 1520 ℃ to 1550 ℃ to 1570 ℃ or above.
Preferably, the alkalinity is 0.6-0.7 in the conventional smelting.
Preferably, in the step (7), the additional amount of the lime powder or the fluorite powder is 80-100kg per submerged arc furnace.
Preferably, the carbon blending amount in the step (2) is increased by 1.8-2.2% according to the weight ratio of the ingredients.
Preferably, the furnace eye is changed in step (6) on a duty basis, and the furnace eye is changed on a shift-by-shift basis or on a furnace-by-furnace basis.
According to the technical scheme, the phosphorus content of the high-silicon-manganese alloy is measured and calculated according to 70% -80% of the quality control standard, the phosphorus content is measured and calculated during first batching, the phosphorus content of the alloy is favorably and rapidly reduced, and normal batching is gradually recovered after the phosphorus content reaches the standard.
After 150 batches, coke and silica were not added;
the by-product of smelting the self-produced slag silicon-manganese alloy is also called silicon-manganese dry slag.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. in the invention, in the normal production process, the time of about 3 days is required for the ordinary silicomanganese to convert high-silicon silicomanganese, the transition period is long, more unqualified products are produced, the overall benefit is influenced, the purpose of reaching the standard within 1 day can be realized after the conversion process is optimized, the alloy quality exchange rate is improved by more than 20 percent, and the problem of more transition products caused by the long transition period of the conversion is effectively solved;
2. after the process is implemented, the rapid conversion between two silicon-manganese alloy brands is realized, the transition period is shortened, the various consumptions are greatly reduced, the recovery rate is improved by 2 percent on the original basis, and the coke consumption is reduced by 50 kg/t;
3. the furnace eye carbon discharge is serious in the ordinary silicomanganese conversion high silicon silicomanganese recarburization silicon extraction process, the problems of difficult furnace eye opening, unsmooth iron tapping, long iron tapping time and the like exist, the fluidity of the iron slag is improved by adjusting the slag shape before the conversion, the conversion transition period is well passed, the iron tapping in front of the furnace is smooth, and the labor intensity of workers is greatly reduced;
4. the furnace temperature is increased before the conversion, the content of alloy silicon is increased to more than 18.5 percent, and good furnace condition conditions are created for the rapid conversion;
5. in the ordinary silicon production 1-2 days before the conversion, high-price low-phosphorus coke is added and enters the furnace for circulation to dilute the whole phosphorus content in the furnace, so that conditions are created for quickly reaching the standard of the phosphorus component of the alloy after the conversion, although the cost of common silicon and manganese is increased due to the addition of the high-price low-phosphorus coke, the cost loss caused by the long transition period compared with the conversion is negligible;
6. in the process of converting common silicomanganese into high silicomanganese, the overall temperature of the furnace body tends to rise greatly along with the rise of the furnace temperature, so that the safety production of high silicomanganese smelting is restricted;
7. due to the change of slag types and the temperature in the furnace in the high-silicon silicomanganese smelting process, the original common silicon stemming cannot meet the requirement of high-silicon smelting hole blocking, the situations of hole blocking or hole running and the like exist in the hole blocking process, and the problem of hole running due to the fact that the furnace hole is not blocked can be effectively solved by researching and attacking the proportion of the high-silicon silicomanganese smelting stemming;
8. the common silicomanganese smelting is carried out for 3 days and 1 furnace eye replacement, after high silicon silicomanganese is converted, because a furnace bottom carbon layer is thickened, the furnace eye region is carbon-deposited due to long time of furnace eye replacement, a molten pool in the furnace is inactive, the alloy quality fluctuates, the activity of the molten pool is increased after the process of furnace eye replacement is adjusted, the reduction of alloy silicon is promoted, and the alloy quality is stabilized.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following embodiments further describe the present invention in detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
The process for smelting the common silicon-manganese alloy and rapidly converting the high-silicon-manganese alloy in the submerged arc furnace comprises the following steps of:
(1) preparing materials; the ingredients comprise a manganese ore ingredient and a coke ingredient, wherein the manganese ore ingredient comprises 35 parts of low-phosphorus low-iron manganese ore, 45 parts of low-phosphorus high-alkalinity medium manganese ore, 10 parts of self-produced slag and a coke ingredient, wherein the low-phosphorus coke with the granularity of 20mm and the chemical coke with the granularity of 10mm are calculated according to parts by weight, the ingredients also comprise 10 parts of coke and 8 parts of silica, the ingredients are the first 100 batches of materials, and after 100 batches of materials, the coke and the silica are not added;
(2) adjusting the furnace condition of the submerged arc furnace 3 days before conversion, inserting an electrode deeply, limiting the electrode at a middle-lower limit position, increasing the carbon distribution amount, and increasing the furnace temperature of the submerged arc furnace, wherein the silicon content in the common silicon-manganese alloy is increased from 17.5% to more than 18.5%, and the step (2) of increasing the furnace temperature of the submerged arc furnace is that the temperature of molten iron in the submerged arc furnace is increased from 1520 ℃ to 1550 ℃ to more than 1570 ℃, and the carbon distribution amount is increased by 1.8% according to the weight ratio of the ingredients;
(3) adding 48 percent of low-phosphorus coke into the ore-smelting furnace for circulation 1 to 2 days before the conversion according to the weight ratio, and reducing the weight ratio of the phosphorus content of the ordinary silicon alloy by 42 percent before the conversion;
(4) 1 day before the conversion, reducing the storage amount of a manganese ore raw material bin to be within 40 percent, controlling the storage amount of a coke bin to be within 50 percent, ensuring that high-silicon manganese materials can enter the submerged arc furnace simultaneously, reducing the smelting charge level of the submerged arc furnace 1.5-2.5 hours before the high-silicon manganese materials are fed, reducing the smelting charge level to be 200mm below the furnace shell of the submerged arc furnace, and completely emptying the silicon materials in the furnace top furnace bin of the submerged arc furnace;
(5) the alkalinity of the slag in the transition period of the conversion is 1.1 times of that in the conventional smelting, and the alkalinity in the conventional smelting is 0.6-0.7;
(6) opening a furnace eye to discharge iron when the power consumption reaches 70% of that of a single furnace, wherein the tapping time is not less than 40min, changing the furnace eye on duty, and changing the furnace eye one by one on a duty or one furnace by one eye;
(7) and (3) dephosphorizing outside the submerged arc furnace, and in the process of tapping iron by the submerged arc furnace, when the liquid level of slag iron in a ladle reaches 1/3, manually adding lime powder or fluorite powder until the P component in the high silicon-manganese alloy reaches the standard, and stopping adding, wherein the adding amount of the lime powder or the fluorite powder is 80kg per submerged arc furnace.
In the embodiment, the transition period of the conversion is shortened to one day from three days before, the quality qualification rate of the alloy in front of the furnace is improved to more than 95% from 75%, the depth of the furnace eye is improved to more than 800mm from 500mm, the deep plugging and the compaction of the furnace eye are realized, and the hole-running fault is reduced to zero from 2 times; the average daily output is improved to 95t from about 90t, the smelting power consumption is reduced to 5600kwh/t from 5900kwh/t, and the improvement of the alloy quality and the economic and technical indexes is realized on the basis of rapid conversion.
Example 2
The process for smelting the common silicon-manganese alloy and rapidly converting the high-silicon-manganese alloy in the submerged arc furnace comprises the following steps of:
(1) preparing materials; the ingredients comprise a manganese ore ingredient and a coke ingredient, wherein the manganese ore ingredient comprises 40 parts of low-phosphorus low-iron manganese ore, 43 parts of low-phosphorus high-alkalinity medium manganese ore, 12 parts of self-produced slag and 42 parts of coke, wherein the low-phosphorus coke with the granularity of 30mm and the chemical coke with the granularity of 20mm are counted by weight parts, the ingredients also comprise 12 parts of coke and 10 parts of silica, the ingredients are the first 120 batches of materials, and coke and silica are not added after 120 batches of materials;
(2) adjusting the furnace condition of the submerged arc furnace 3 days before conversion, inserting an electrode deeply, limiting the electrode at a middle and lower limit position, increasing the carbon distribution amount, and increasing the furnace temperature of the submerged arc furnace, wherein the silicon content in the common silicon-manganese alloy is increased from 17.5% to more than 18.5%, and the step (2) of increasing the furnace temperature of the submerged arc furnace is that the temperature of molten iron in the submerged arc furnace is increased from 1520 ℃ to 1550 ℃ to more than 1570 ℃, and the carbon distribution amount is increased by 2.0% according to the weight ratio of the ingredients;
(3) 1-2 days before the conversion, 50% of low-phosphorus coke is added according to the weight ratio and enters the submerged arc furnace for circulation, and the weight ratio of the phosphorus content of the ordinary silicon alloy before the conversion is reduced by 40%;
(4) 1 day before the conversion, reducing the storage amount of a manganese ore raw material bin to be within 40 percent, controlling the storage amount of a coke bin to be within 50 percent, ensuring that high-silicon manganese materials can enter the submerged arc furnace simultaneously, reducing the smelting charge level of the submerged arc furnace 1.5-2.5 hours before the high-silicon manganese materials are fed, reducing the smelting charge level to be 250mm below the furnace shell of the submerged arc furnace, and completely emptying the silicon materials in the furnace top furnace bin of the submerged arc furnace;
(5) the alkalinity of the slag in the transition period of the conversion is 1.1 times of that in the conventional smelting, and the alkalinity in the conventional smelting is 0.6-0.7;
(6) opening a furnace eye to discharge iron when the power consumption reaches 72% of that of a single furnace, wherein the tapping time is not less than 40min, changing the furnace eye on duty, and changing the furnace eye one by one on a duty or one furnace by one eye;
(7) and (3) dephosphorizing outside the submerged arc furnace, and in the process of tapping iron by the submerged arc furnace, when the liquid level of slag iron in a ladle reaches 1/3, manually adding lime powder or fluorite powder until the P component in the high silicon-manganese alloy reaches the standard, and stopping adding, wherein the adding amount of the lime powder or the fluorite powder is 90kg per submerged arc furnace.
In the embodiment, the transition period of the conversion is shortened to one day from three days before, the quality qualification rate of the alloy in front of the furnace is improved to more than 92% from 75%, the depth of the furnace eye is improved to more than 850mm from 500mm, the deep plugging and the compaction of the furnace eye are realized, and the hole-running fault is reduced to zero from 2 times; the average daily output is increased to 97t from about 90t, the smelting power consumption is reduced to 5700kwh/t from 5900kwh/t, and the improvement of the alloy quality and the economic and technical indexes is realized on the basis of rapid conversion.
Example 3
The process for smelting the common silicon-manganese alloy and rapidly converting the high-silicon-manganese alloy in the submerged arc furnace comprises the following steps of:
(1) preparing materials; the ingredients comprise manganese ore ingredients and coke ingredients, wherein the manganese ore ingredients comprise 45 parts of low-phosphorus low-iron manganese ore, 50 parts of low-phosphorus high-alkalinity medium manganese ore, 15 parts of self-produced slag, the coke ingredients comprise 55 parts of low-phosphorus coke with the granularity of 40mm and 40 parts of chemical coke with the granularity of 30mm in parts by weight, the ingredients also comprise 15 parts of coke and 12 parts of silica in parts by weight, the ingredients are the first 150 batches of materials, and after 150 batches of materials, coke and silica are not added;
(2) adjusting the furnace condition of the submerged arc furnace 3 days before conversion, inserting an electrode deeply, limiting the electrode at a middle and lower limit position, increasing the carbon distribution amount, and increasing the furnace temperature of the submerged arc furnace, wherein the silicon content in the common silicon-manganese alloy is increased from 17.5% to more than 18.5%, and the step (2) of increasing the furnace temperature of the submerged arc furnace is that the temperature of molten iron in the submerged arc furnace is increased from 1520 ℃ to 1550 ℃ to more than 1570 ℃, and the carbon distribution amount is increased by 2.2% according to the weight ratio of the ingredients;
(3) adding 52 percent of low-phosphorus coke into the ore-smelting furnace for circulation 1 to 2 days before the conversion according to the weight ratio, and reducing the weight ratio of the phosphorus content of the ordinary silicon alloy by 38 percent before the conversion;
(4) 1 day before the conversion, reducing the storage amount of a manganese ore raw material bin to be within 40 percent, controlling the storage amount of a coke bin to be within 50 percent, ensuring that high-silicon manganese materials can enter the submerged arc furnace simultaneously, reducing the smelting charge level of the submerged arc furnace 1.5-2.5 hours before the high-silicon manganese materials are fed, reducing the smelting charge level to be 300mm below the furnace shell of the submerged arc furnace, and completely emptying the silicon materials in the furnace top furnace bin of the submerged arc furnace;
(5) the alkalinity of the slag in the transition period of the conversion is 1.1 times of that in the conventional smelting, and the alkalinity in the conventional smelting is 0.6-0.7;
(6) opening a furnace eye to discharge iron when the power consumption reaches 75% of that of a single furnace, wherein the tapping time is not less than 40min, changing the furnace eye on duty, and changing the furnace eye one by one on a duty or one furnace by one eye;
(7) and (3) dephosphorizing outside the submerged arc furnace, and in the process of tapping iron by the submerged arc furnace, when the liquid level of slag iron in a ladle reaches 1/3, manually adding lime powder or fluorite powder until the P component in the high silicon-manganese alloy reaches the standard, and stopping adding, wherein the adding amount of the lime powder or the fluorite powder is 100kg per submerged arc furnace.
In the embodiment, the transition period of the conversion is shortened from three days to one and a half days, the quality qualification rate of the alloy in front of the furnace is improved from 75 percent to more than 90 percent, the depth of the furnace eye is improved from 400-500mm to more than 1000mm, the deep plugging and compaction of the furnace eye are realized, and the hole-leakage fault is reduced from 2 times to zero fault; the average daily output is improved to 100t from about 90t, the smelting power consumption is reduced to 5650kwh/t from 5900kwh/t, and the improvement of the alloy quality and the economic and technical indexes is realized on the basis of rapid conversion.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The process for smelting the common silicon-manganese alloy and rapidly converting the high-silicon-manganese alloy in the submerged arc furnace is characterized by comprising the following steps of:
(1) preparing materials;
(2) adjusting the furnace condition of the submerged arc furnace 3 days before the conversion, inserting an electrode deeply, limiting the electrode at the middle and lower limit positions, increasing the carbon distribution amount, and increasing the furnace temperature of the submerged arc furnace, wherein the silicon content in the common silicon-manganese alloy is increased from 17.5% to more than 18.5%;
(3) adding 48-52% of low-phosphorus coke into the ore-smelting furnace for circulation 1-2 days before the conversion according to the weight ratio, and reducing the weight ratio of the phosphorus content of the ordinary silicon alloy by 38-42% before the conversion;
(4) 1 day before conversion, reducing the storage amount of a manganese ore raw material bin to be within 40 percent, controlling the storage amount of a coke bin to be within 50 percent, ensuring that high-silicon-manganese materials can enter the submerged arc furnace simultaneously, reducing the smelting charge level of the submerged arc furnace 1.5-2.5 hours before the high-silicon-manganese materials are fed, reducing the smelting charge level to be 200-300mm below the furnace shell of the submerged arc furnace, and completely emptying the ordinary silicon materials in the furnace top furnace bin of the submerged arc furnace;
(5) the alkalinity of the slag in the transition period of the conversion is 1.1 times of that in the conventional smelting process;
(6) opening a furnace eye to cast iron when the power consumption reaches 70% -75% of that of a single furnace, wherein the tapping time is not less than 40 min;
(7) and (3) dephosphorizing outside the submerged arc furnace, and manually adding lime powder or fluorite powder when the liquid level of slag iron in a ladle reaches 1/3 in the process of tapping iron by the submerged arc furnace until the P component in the high silicon-manganese alloy reaches the standard.
2. The process for smelting a common silicon-manganese alloy and rapidly converting a high-silicon-manganese alloy by using the submerged arc furnace as claimed in claim 1, wherein the ingredients in the step (1) comprise, by weight, 35-45 parts of low-phosphorus low-iron manganese ore, 45-50 parts of low-phosphorus high-alkalinity medium manganese ore, 10-15 parts of self-produced slag, 55-60 parts of low-phosphorus coke with the granularity of 20-40mm and 40-45 parts of chemical coke with the granularity of 10-30 mm.
3. The process for smelting a common silicon-manganese alloy and rapidly converting a high-silicon-manganese alloy by using the submerged arc furnace as claimed in claim 2, wherein in the step (1), the ingredients comprise 40 parts by weight of low-phosphorus low-iron manganese ore, 43 parts by weight of low-phosphorus high-alkalinity medium manganese ore, 12 parts by weight of self-produced slag, 58 parts by weight of coke with a particle size of 30mm and 42 parts by weight of chemical coke with a particle size of 20 mm.
4. The process for rapidly converting a common silicon-manganese alloy into a high silicon-manganese alloy by the submerged arc furnace as claimed in claim 2 or 3, wherein the ingredients further comprise 10-15 parts by weight of coke and 8-12 parts by weight of silica.
5. The process for smelting common Si-Mn alloy to rapidly convert high-Si-Mn alloy according to claim 4 in the submerged arc furnace, wherein the raw materials comprise the first 100-150 batches of materials.
6. The process for smelting a high-silicon silicomanganese alloy by using a submerged arc furnace as claimed in claim 1, wherein the temperature of the molten iron in the submerged arc furnace is increased from 1520 ℃ to 1550 ℃ to 1570 ℃ in the step (2).
7. The process for smelting high-silicon Si-Mn alloy by the submerged arc furnace as claimed in claim 1, wherein the basicity is 0.6-0.7 in the conventional smelting process.
8. The process for smelting high-silicon silicomanganese alloy by using the submerged arc furnace as claimed in claim 1, wherein in the step (7), the amount of lime powder or fluorite powder added is 80-100kg per submerged arc furnace.
9. The process for smelting high-silicon Si-Mn alloy by using the submerged arc furnace as claimed in claim 1, wherein the amount of carbon added in the step (2) is increased by 1.8-2.2% by weight of the ingredients.
10. The process for smelting high-Si-Mn alloy by the submerged arc furnace according to claim 1, wherein the furnace eye is changed in step (6) according to the change of one furnace for one shift or one furnace for one shift.
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| CN113528865A (en) * | 2021-06-11 | 2021-10-22 | 嘉峪关宏电铁合金有限责任公司 | Manganese-silicon alloy low-calcium slag type smelting process |
| CN113969351A (en) * | 2021-11-22 | 2022-01-25 | 东北大学 | Method for preparing silicon-manganese alloy by using cooperation of reduction and electrolysis through multi-loop direct current electrode arc heating |
| CN114908263A (en) * | 2022-06-11 | 2022-08-16 | 赤峰鑫旭铸造有限公司 | Preparation method of silicon-manganese alloy |
| CN115354153A (en) * | 2022-07-28 | 2022-11-18 | 嘉峪关宏电铁合金有限责任公司 | Method for quickly recovering furnace condition after stopping silicon-manganese ore heating furnace |
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| CN115354153A (en) * | 2022-07-28 | 2022-11-18 | 嘉峪关宏电铁合金有限责任公司 | Method for quickly recovering furnace condition after stopping silicon-manganese ore heating furnace |
| CN115354153B (en) * | 2022-07-28 | 2023-11-10 | 嘉峪关宏电铁合金有限责任公司 | Method for quickly recovering furnace conditions after furnace shutdown of silicomanganese submerged arc furnace |
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