CN115096071B - Method for reducing consumption of steel-making lime of electric arc furnace by recycling tailings - Google Patents
Method for reducing consumption of steel-making lime of electric arc furnace by recycling tailings Download PDFInfo
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- CN115096071B CN115096071B CN202210521578.6A CN202210521578A CN115096071B CN 115096071 B CN115096071 B CN 115096071B CN 202210521578 A CN202210521578 A CN 202210521578A CN 115096071 B CN115096071 B CN 115096071B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
- F27B3/08—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces heated electrically, with or without any other source of heat
- F27B3/085—Arc furnaces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
- F27B3/10—Details, accessories, or equipment peculiar to hearth-type furnaces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
- F27B3/10—Details, accessories, or equipment peculiar to hearth-type furnaces
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Abstract
The invention provides a method for reducing the consumption of steel-making lime of an electric arc furnace by recycling tailings, belonging to the technical field of recycling metallurgical solid wastes. In the method, the electric arc furnace is a horizontal continuous charging electric arc furnace, and slag is left before smelting in other furnace times except the first furnace, wherein the mass of the slag left is 8% -10% of the tapping amount; the final slag alkalinity is controlled to be between 2.0 and 2.2 for different batches of scrap steel without adding tail slag, the addition amount of lime and dolomite is determined, the addition amount of scrap steel is recorded, and SiO in slag is calculated 2 An increment; the tailings replace lime to form slag with the equal mass of 1:1, and on the premise of ensuring that the final slag alkalinity of the furnace secondary of adding the tailings is more than or equal to 1.8, siO in the slag corresponding to the components of the tailings and the addition amount of the scrap steel of the furnace secondary is ensured 2 And (5) increasing, and determining the mass and the components of the slag left before smelting, wherein the addition amount of lime is reduced maximally at a time. The method can reduce the electricity consumption, and the tailings can be quickly formed into slag after being returned to use, so that the lime consumption is reduced.
Description
Technical Field
The invention relates to the technical field of metallurgical solid waste recycling, in particular to a method for reducing the consumption of steel-making lime of an electric arc furnace by recycling tailings.
Background
The electric arc furnace has high tailings yield but low utilization rate, and causes great load on the environment. The tailings of the electric arc furnace still have certain alkalinity after being treated by procedures such as crushing, magnetic separation and iron screening, and the like, and the CaO content of the tailings is between 35 and 40 percent in general, and SiO is contained 2 The content is 18-20%, the alkalinity is 1.8-2.2, the FeO content is 17-25%, the MgO content is 7-10%, the conditions of replacing lime slag formation can be returned for use, the tailings can be recycled to reduce the lime consumption, and the addition of high-oxidability tailings into the next furnace smelting can quickly dissolve the slag, thereby being beneficial to reducing oxygen consumption and partial electricity consumption and improving the improvementMetal yield.
Because the raw materials used in electric arc furnace steelmaking are scrap steel, the silicon content and the silicon-containing impurity content (such as soil and the like) of different material types in the scrap steel are unknown, no effective theoretical guidance is formed on the recycling amount of the tail slag of the electric arc furnace, the alkalinity of the slag is greatly reduced after the tail slag is recycled for a few times, the corrosion of a furnace lining is aggravated by the viscosity reduction, and the slag with lower alkalinity is unfavorable for the generation and stabilization of foam slag, so that the electric arc thermal efficiency is reduced, the energy loss is increased, and the steelmaking cost is increased. The tailings are used for replacing part of lime for slagging, so that the lime consumption is reduced, the tailings are produced foam slag, the foam slag can be quickly melted into slag after being added into a furnace, the energy consumption is reduced, the tailings contain a certain amount of FeO, the oxygen consumption can be properly reduced due to a certain oxidability, and the metal yield is improved. The invention adds no SiO in the slag of the tailing-free furnace secondary slag 2 Calculation of increment, i.e. SiO introduced or generated by the strip 2 On the premise of ensuring that the final slag alkalinity of the tailing adding furnace is more than or equal to 1.8, the tailings replace the equivalent mass lime for slagging in a 1:1 mode, the maximum recycling amount of the furnace tailings is determined, namely the amount of lime addition is reduced at a maximum time, and the tailings replace lime to the maximum extent, so that the cost per ton of steel is reduced.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for reducing the consumption of the lime for electric arc furnace steelmaking by recycling tailings, which can greatly reduce the consumption of the lime, thereby reducing the smelting cost.
The method adopts a horizontal continuous charging type electric arc furnace, and slag is left before smelting in other furnace times except the first furnace; aiming at different batches of scrap steel, controlling the final slag alkalinity to be 2.0-2.2 without adding tail slag, determining the addition amount of lime and dolomite, recording the addition amount of scrap steel, and calculating slag SiO 2 Incremental (i.e. incorporation or production of scrap tape into SiO) 2 An amount of; and (3) in the tailing adding furnace, the tailings are subjected to slag making by replacing lime with the mass of 1:1, and the maximum recycling amount of the tailings in the furnace is determined on the premise that the final slag alkalinity of the furnace is more than or equal to 1.8, namely the lime adding amount is reduced at a maximum time, so that the lime consumption is reduced.
Wherein the mass of the remained slag is 8-10% of the tapping amount.
Slag SiO 2 The incremental calculation process is as follows:
wherein: m is M Residue remaining -slag mass left before smelting, kg;
％CaO slag retention 1 -CaO content of slag left in the furnace without adding tail slag,%;
％SiO 2 leave residue 1 -no tailing is added and slag is left in the heat treatment SiO 2 Content,%;
M lime 、M Dolomite (Dolomite) -adding lime and dolomite without adding tail slag for furnace times, and kg;
％CaO lime 、％CaO Dolomite (Dolomite) -CaO content in lime, dolomite,%;
％CaO slag of -CaO content of final slag of the furnace without adding tail slag,%;
％SiO 2 slag -final slag SiO of furnace without adding tail slag 2 Content,%;
％SiO 2 lime 、％SiO 2 dolomite SiO in lime and dolomite 2 Content,%;
SiO 2 increase -no tailing of furnace slag SiO 2 Increment, kg.
Before slagging, the tailings are crushed (generally to 30-50 mm) and magnetically separated, and the CaO content in the obtained tailings is 35-40%, siO 2 18-20 percent of FeO 17-25 percent and MgO 7-10 percent.
In the tailing adding process, according to the components of the tailings and the slag SiO corresponding to the addition amount of scrap steel in the tailing adding process 2 The increment, the quality and the components of the slag left before smelting, and the addition amount and the components of slag charge ensure that the addition amount of lime is calculated to be reduced at maximum once when the final slag alkalinity of the furnace is more than or equal to 1.8. Wherein, scrap steel used in the tailing adding furnace and the tailing not adding furnace are required to be in the same batch so as to ensure the slag SiO involved in calculation 2 The increments are the same.
The calculation process of the single maximum lime addition reduction is as follows:
wherein: m is M Lime 、M Dolomite (Dolomite) -adding lime and dolomite without adding tail slag for furnace times, and kg;
％CaO lime 、％CaO Dolomite (Dolomite) -CaO content in lime, dolomite,%;
％SiO 2 lime 、％SiO 2 dolomite SiO in lime and dolomite 2 Content,%;
M tailings -the addition of tailings, kg; namely, the lime addition amount is reduced;
％CaO tailings -CaO content in the tailings,%;
％SiO 2 tailings SiO in tailings 2 Content,%;
M residue remaining -mass of residue left, kg;
％CaO slag 2 -CaO content of slag left before smelting by adding tail slag for the heat treatment,%;
％SiO 2 leave residue 2 Slag SiO remained before smelting in tailing adding furnace 2 Content,%;
SiO 2 increase SiO in furnace slag of furnace secondary without adding tail slag 2 Increment, kg;
η is the ratio of the addition of scrap to scrap of the furnace with no addition of tailings.
Before the tailings are added, the tailings are weighed, fully preheated and dried through a horizontal preheating channel and then added into a furnace.
In the method, the quality of the slag is not suitable to be too large or too small, and the excessive quality of the slag can cause excessive slag smelting quantity of the next adjacent furnace, heat loss is increased, and lining erosion is aggravated; the quality of the remained slag is too small, which is not beneficial to submerged arc smelting of foam slag produced in the next adjacent furnace, and the thermal efficiency of the electric arc is reduced.
The tailings have a certain alkalinity, the alkalinity of the tailings is between 1.8 and 2.2, and the conditions of being capable of being returned to replace part of lime for slagging are provided.
When the tailings replace lime for slagging, the waste steel is uniformly distributed, and the SiO carried in or produced by each t of waste steel can be considered 2 The amounts are substantially the same.
The tailings replace the equivalent mass lime for slagging in a ratio of 1:1, so that the maximum recycling amount of the tailings is calculated on the premise of not increasing or reducing the slag amount, the slag amount is increased, the heat loss is increased, and the corrosion of a furnace lining is aggravated; the reduction of the slag quantity is disadvantageous for submerged arc smelting, resulting in a reduction of the arc thermal efficiency.
In the method, the furnace charge without adding the tailings and the furnace charge with adding the tailings are the same batch of scrap steel, and can be continuous adjacent furnace charges or discontinuous furnace charges.
The technical scheme of the invention has the following beneficial effects:
(1) The invention provides a recycling method of metallurgical solid wastes, which reduces environmental protection pressure, is beneficial to the development of green low carbonization of enterprises, uses electric furnace tailings to replace part of lime in electric furnace steelmaking, realizes recycling of the electric furnace tailings, reduces the use amount of slag lime, and reduces the production cost of ton steel.
(2) The electric furnace tailings contain part (FeO), and the use of the tailings to replace part of lime for slagging is beneficial to recycling the FeO in the tailings, so that the metal yield is improved, and the production benefit is improved.
Drawings
FIG. 1 is a process flow diagram of a method for reducing lime consumption in electric arc furnace steelmaking by tailings reuse in accordance with the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages to be solved more apparent, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.
The invention provides a method for reducing the consumption of steelmaking lime of an electric arc furnace by recycling tailings.
As shown in figure 1, the method adopts a horizontal continuous charging type electric arc furnace, and slag is left before smelting of other furnace times except the first furnace time; the final slag is carried out for different batches of scrap steel without adding tail slagThe alkalinity is controlled between 2.0 and 2.2, the addition of lime and dolomite is determined, the addition of scrap steel is recorded, and the SiO of slag is calculated 2 An increment; and (3) in the tailing adding furnace, replacing lime with tailings with the mass of 1:1, and determining the maximum recycling amount of the tailings in the furnace on the premise of ensuring that the final slag alkalinity of the furnace is more than or equal to 1.8, namely, reducing the lime adding amount at a maximum time, so as to reduce lime consumption.
The electric furnace tailings are originally produced foam slag, the melting point is low, the power consumption can be correspondingly reduced, the slag can be quickly formed after the electric furnace tailings are returned to be used, and the lime consumption is reduced.
The following describes specific embodiments.
Example 1
No tailing heat is added: the mass of the slag is 8t, the adding amount of the waste steel is 86.8t, the CaO content of the slag is 37.5 percent before smelting, and the SiO is formed 2 17.7 percent of the final slag, 38.5 percent of CaO and SiO 2 The content is 18.1%, the alkalinity is 2.12, the tapping amount is 85.5t, and the adding amount of slag lime and dolomite is 32kg/t and 10kg/t respectively;
adding tailings for a heat treatment: the slag remaining amount is 7.5t, the addition amount of the smelting scrap steel is 87t, the CaO content of the tailings is 39.8 percent, and the SiO is the mixture of the slag and the CaO 2 The content of CaO in the slag left before smelting is 19.1 percent, the content of CaO in the slag left before smelting is 40.1 percent, and SiO is the same as the content of the raw materials 2 The content is 19.2%;
the treatment is carried out according to the following method:
(1) Recording that the addition amount of scrap steel of no-tailing-addition furnace number is 86800kg, slag charge is 2736kg lime and 855kg dolomite, the CaO content of slag left before smelting is 37.5%, and SiO 2 17.7 percent of the final slag, 38.5 percent of CaO and SiO 2 The content was 18.1%.
(2) Calculation of SiO in slag 2 Increment:
wherein:
M lime =2736 kg, lime addition;
M dolomite (Dolomite) =855 kg, adding dolomiteAn amount of;
M residue remaining 8000kg, which is the mass of slag left before smelting;
％CaO lime =90% and is the CaO content in lime;
％CaO dolomite (Dolomite) =30% and is CaO content in dolomite;
％CaO slag of =38.5% and is the final slag CaO content;
％SiO 2 slag =18.1% as final slag SiO 2 The content is as follows;
％CaO slag retention 1 =37.5%, caO content was left for the untangling heat;
％SiO 2 leave residue 1 17.7%, for slag SiO remaining in the non-tailing heat 2 The content is as follows;
％SiO 2 lime =5% of SiO in lime 2 The content is as follows;
％SiO 2 dolomite =4% of SiO in dolomite 2 The content is as follows;
substituting the data into the formula (1), and solving to obtain: siO (SiO) 2 increase 1101kg of SiO in slag at 86.8t of scrap 2 And (5) increasing.
(3) The CaO content of the tailings is 39.8%, siO 2 The content was 19.1%.
(4) The CaO content of the slag-remaining component before smelting the tailing adding heat is 40.1 percent, and the SiO content is equal to that of the slag-remaining component 2 The content is 19.2%, the adding amount of the scrap steel is 87000kg, and the maximum recycling amount of the furnace slag is determined on the premise of ensuring that the alkalinity of the furnace slag is more than or equal to 1.8, namely the adding amount of lime is reduced at a single maximum.
(5) Calculating the maximum recycling amount of the secondary tailings:
wherein:
M lime 2736kg, the lime addition without tailings;
M dolomite (Dolomite) =855 kg, dolomite addition;
％CaO lime =90% and is the CaO content in lime;
％CaO dolomite (Dolomite) =30% and is CaO content in dolomite;
％SiO 2 lime =5% of SiO in lime 2 The content is as follows;
％SiO 2 dolomite =4% of SiO in dolomite 2 The content is as follows;
％CaO tailings =39.8% and is the CaO content of the tailings;
％SiO 2 tailings =19.1% as SiO in tailings 2 The content is as follows;
M residue remaining =7500 kg, the mass of residue remaining;
％CaO slag 2 =40.1% and is the CaO content of the left slag before smelting the tailing adding heat;
％SiO 2 leave residue 2 =19.2% of SiO left before smelting in tailing furnace 2 The content is as follows;
siO 2 increase 1101kg of SiO in slag at 86.8t of scrap 2 An increment;
η=87000/86800, ratio of added tailings to non-added tailings heat scrap addition.
Substituting the above data into formula (2) to obtain M Tailings The maximum recycling amount of tailings is 1111kg which is less than or equal to 1111kg, namely 1111kg of lime addition amount is reduced once.
The single tailings recycling amount in the field experiment is 1100kg, the lime adding amount is 1700kg, and the final slag alkalinity is 1.82, which basically accords with the calculation result, so that the method can be considered to have a certain guiding effect.
Example 2
No tailing heat is added: the mass of the slag is 7.8t, the addition amount of the waste steel is 85.5t, the CaO content of the slag is 39.6 percent before smelting, and the SiO is the mixture 2 18.6 percent of the final slag, 39 percent of CaO and SiO 2 The content is 18.7%, the alkalinity is 2.08, the tapping amount is 84.4t, and the adding amount of slag lime and dolomite is 34kg/t and 10kg/t respectively;
adding tailings for a heat treatment: the mass of the remained slag is 7.1t, the adding amount of the smelting scrap steel is 83.7t, and the CaO content of the tailings is that38.9% of SiO 2 The content of CaO in the slag left before smelting is 19.3 percent, the content of CaO in the slag left before smelting is 38.7 percent, and SiO is the same as the content of the CaO in the slag left before smelting 2 The content is 18.8%;
according to the addition amount of scrap steel of the non-tailing heat, the slag remaining component before smelting and the final slag component, calculating to obtain slag SiO 2 The increment is 1212kg;
according to the components of tailings, the addition amount of scrap steel of a tailing adding furnace and the components of slag remaining before smelting, the maximum recycling amount of the tailings of the furnace is 945kg, namely 945kg of lime addition amount is reduced once on the premise of ensuring that the slag alkalinity of the furnace is more than or equal to 1.8.
The recycling amount of single tailings in the field experiment is 900kg, the adding amount of lime is 2000kg, and the final slag alkalinity is 1.85, which basically accords with the calculation result, so that the method can be considered to have a certain guiding effect.
Example 3
No tailing heat is added: the mass of the slag is 7.6t, the addition amount of the waste steel is 85.7t, the CaO content of the slag is 38.6 percent before smelting, and the SiO is formed 2 18.1 percent of the final slag, 38.8 percent of CaO and SiO 2 The content is 18%, the alkalinity is 2.15, the tapping amount is 84.6t, and the adding amount of slag lime and dolomite is 37kg/t and 10kg/t respectively;
adding tailings for a heat treatment: the mass of the remained slag is 6.9t, the adding amount of the smelting scrap steel is 86t, the CaO content of the tailings is 37.8 percent, and the SiO is the mixture of the slag and the CaO 2 The content is 18.8%, the CaO content of the slag remained before smelting is 37.9%, and the SiO content is 18.8% 2 The content is 18%;
according to the addition amount of scrap steel of the non-tailing heat, the slag remaining component before smelting and the final slag component, calculating to obtain slag SiO 2 The increment is 1219kg;
according to the components of tailings, the addition amount of scrap steel of a tailing adding furnace and the components of slag remaining before smelting, the maximum recycling amount of the tailings of the furnace is 1175kg on the premise that the slag alkalinity of the furnace is more than or equal to 1.8, namely the addition amount of lime is 1175kg reduced once.
The single tailings recycling amount in the field experiment is 1100kg, the lime adding amount is 2100kg, and the final slag alkalinity is 1.84, which basically accords with the calculation result, so that the method can be considered to have a certain guiding effect.
Example 4
No tailing heat is added: the mass of the slag is 7.3t, the addition amount of the waste steel is 86.6t, the CaO content of the slag is 38.5 percent before smelting, and the SiO is produced 2 17.6 percent of the content, 38.6 percent of CaO as an endpoint slag component and SiO 2 The content is 17.9%, the alkalinity is 2.16, the tapping amount is 85.4t, and the adding amount of slag lime and dolomite is 34kg/t and 10kg/t respectively;
adding tailings for a heat treatment: the mass of the remained slag is 7.8t, the adding amount of the smelting scrap steel is 85.7t, the CaO content of the tailings is 36.6 percent, and the SiO is the mixture of the slag and the CaO 2 The content of CaO is 18.6%, the content of CaO left in slag before smelting is 36.9%, siO 2 The content is 18%;
according to the addition amount of scrap steel of the non-tailing heat, the slag remaining component before smelting and the final slag component, calculating to obtain slag SiO 2 The increment is 1169kg;
according to the components of tailings, the addition amount of scrap steel of a tailing adding furnace and the components of slag remaining before smelting, the maximum recycling amount of the tailings of the furnace is 1046kg on the premise that the slag alkalinity of the furnace is more than or equal to 1.8, namely 1046kg of lime addition amount is reduced once.
The single tailings recycling amount in the field experiment is 1000kg, the lime adding amount is 1900kg, and the final slag alkalinity is 1.86, which basically accords with the calculation result, so that the method can be considered to have a certain guiding effect.
Example 5
No tailing heat is added: the mass of the slag is 8.1t, the adding amount of the waste steel for smelting is 90.2t, the CaO content of the slag is 38.1 percent before smelting, and the SiO is produced 2 18.9 percent of the final slag, 39 percent of CaO and SiO 2 The content is 18.9%, the alkalinity is 2.06, the tapping amount is 84.7t, and the adding amount of slag lime and dolomite is 30kg/t and 10kg/t respectively;
adding tailings for a heat treatment: the mass of the remained slag is 7.4t, the adding amount of the smelting scrap steel is 87t, the CaO content of the tailings is 37.9 percent, and the SiO is the mixture of the slag and the CaO 2 The content of CaO in the slag left before smelting is 19.4 percent, the content of CaO in the slag left before smelting is 38.6 percent, and SiO is the mixture 2 The content is 18.6%;
according to the addition amount of scrap steel of the non-tailing heat, the slag remaining component before smelting and the final slag component, calculating to obtain slag SiO 2 The increment is 1035kg;
according to the components of tailings, the addition amount of scrap steel of a tailing adding furnace and the components of slag remaining before smelting, the maximum recycling amount of the tailings of the furnace is determined to be 1068kg on the premise that the alkalinity of the slag of the furnace is more than or equal to 1.8, namely the addition amount of lime is reduced by 1068kg in a single time.
The single tailings recycling amount in the field experiment is 1000kg, the lime adding amount is 1600kg, and the final slag alkalinity is 1.84, which basically accords with the calculation result, so that the method can be considered to have a certain guiding effect.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.
Claims (5)
1. A method for reducing the consumption of lime in electric arc furnace steelmaking by recycling tailings is characterized in that a horizontal continuous charging type electric arc furnace is adopted, and slag is reserved before smelting in other furnace times except the first furnace; aiming at different batches of scrap steel, controlling the final slag alkalinity to be 2.0-2.2 without adding tail slag, determining the addition amount of lime and dolomite, recording the addition amount of scrap steel, and calculating slag SiO 2 An increment; in the process of adding tailings, the tailings are subjected to slag making by replacing lime with the mass of 1:1, and the maximum recycling amount of the tailings in the process is determined on the premise that the final slag alkalinity of the process is more than or equal to 1.8, namely the lime addition amount is reduced at a maximum time, so that the lime consumption is reduced;
the mass of the left slag is 8% -10% of the tapping amount;
the tailing adding heat is carried out according to slag SiO corresponding to the addition amount of the waste steel of the tailing adding heat 2 Incremental quantity, slag quality and components before smelting, slag addition quantity and components, and calculating a single maximum lime addition quantity reduction when the final slag alkalinity of the furnace is more than or equal to 1.8;
the single maximum lime addition reduction calculation process is as follows:
wherein: n (N) Lime 、M Dolomite (Dolomite) -adding lime and dolomite without adding tail slag for furnace times, and kg;
％CaO lime 、％CaO Dolomite (Dolomite) -CaO content in lime, dolomite,%;
％SiO 2 lime 、％SiO 2 dolomite SiO in lime and dolomite 2 Content,%;
M tailings -the addition of tailings, kg;
％CaO tailings -CaO content in the tailings,%;
％SiO 2 tailings SiO in tailings 2 Content,%;
M residue remaining -mass of residue left, kg;
％CaO slag 2 -CaO content of slag left before smelting by adding tail slag for the heat treatment,%;
％SiO 2 tailings 2 Slag SiO remained before smelting in tailing adding furnace 2 Content,%;
SiO 2 increase SiO in furnace slag of furnace secondary without adding tail slag 2 Increment, kg;
η is the ratio of the addition of scrap steel of the furnace number of the tailing adding and the no-tailing adding;
calculated tailing addition M Tailings I.e. a reduced lime addition.
2. The method for reducing lime consumption in electric arc furnace steelmaking as claimed in claim 1, wherein said slag is SiO 2 The incremental calculation process is as follows:
wherein: m is M Tailings -slag mass left before smelting, kg;
％CaO slag retention 1 -CaO content of slag left in the furnace without adding tail slag,%;
％SiO 2 leave residue 1 -no tailing is added and slag is left in the heat treatment SiO 2 Content,%;
M lime 、M Dolomite (Dolomite) -adding lime and dolomite without adding tail slag for furnace times, and kg;
％CaO lime 、％CaO Dolomite (Dolomite) -CaO content in lime, dolomite,%;
％CaO slag of -CaO content of final slag of the furnace without adding tail slag,%;
％SiO 2 slag -final slag SiO of furnace without adding tail slag 2 Content,%;
％SiO 2 lime 、％SiO 2 dolomite SiO in lime and dolomite 2 Content,%;
SiO 2 increase -no tailing of furnace slag SiO 2 Increment, kg.
3. The method for reducing the consumption of the steel-making lime of the electric arc furnace by recycling the tailings according to claim 1, wherein the tailings are crushed and subjected to magnetic separation before slagging, and the CaO content of the obtained tailings is 35-40 percent, and SiO 2 18-20 percent of FeO 17-25 percent and MgO 7-10 percent.
4. The method for reducing lime consumption in electric arc furnace steelmaking according to claim 1, wherein said tailing heat and non-tailing heat are of the same batch of scrap steel to ensure the slag SiO involved in the calculation 2 The increments are the same.
5. A method of reducing lime consumption in electric arc furnace steelmaking as claimed in claim 3, wherein the tailings breaker particle size is in the range 30-50mm.
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