CN115096071A - Method for reducing consumption of electric arc furnace steelmaking lime by recycling tailings - Google Patents
Method for reducing consumption of electric arc furnace steelmaking lime by recycling tailings Download PDFInfo
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- CN115096071A CN115096071A CN202210521578.6A CN202210521578A CN115096071A CN 115096071 A CN115096071 A CN 115096071A CN 202210521578 A CN202210521578 A CN 202210521578A CN 115096071 A CN115096071 A CN 115096071A
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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
- F27B3/28—Arrangement of controlling, monitoring, alarm or the like devices
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Abstract
The invention provides a method for reducing the consumption of lime for steelmaking of an electric arc furnace by recycling tailings, belonging to the technical field of recycling of metallurgical solid wastes. In the method, the electric arc furnace is a horizontal continuous feeding type electric arc furnace, except the first furnace, the remaining slag is left before the smelting of other furnaces, and the mass of the remaining slag is 8-10% of the steel tapping amount; aiming at different batches of waste steel without adding tailing, controlling the alkalinity of final slag to be 2.0-2.2, determining the addition of lime and dolomite, recording the addition of the waste steel, and calculating the SiO in the slag 2 Increment; the tailings are 1:1 in equal mass to replace lime for slagging, and on the premise of ensuring that the alkalinity of the final slag of the tailing-adding furnace is more than or equal to 1.8, according to the components of the tailings and the SiO in the slag corresponding to the adding amount of the waste steel of the furnace 2 Increment, slag quality and components before smelting, and determining the maximum lime addition amount reduced in a single time. The method canThe power consumption can be reduced, the tailings can be rapidly slagged after being returned for use, and 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 lime in electric arc furnace steelmaking by recycling tailings.
Background
The production of the electric arc furnace tailings is high, but the utilization rate is low, and a large load is caused to the environment. The tailings of the electric arc furnace still have certain alkalinity after being treated by the working procedures of crushing, magnetic separation, iron screening and the like, and the overall view shows that the CaO content of the tailings is between 35 and 40 percent and the SiO content is between 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 condition of returning to use for replacing lime slagging is provided, the tailings can be recycled to reduce the lime consumption, and the high-oxidizability tailings can be added into the next furnace for smelting to rapidly melt the slag, thereby being beneficial to reducing the oxygen consumption and partial power consumption and improving the metal yield.
Because the raw materials used for electric arc furnace steelmaking are scrap steel, the silicon content and the silicon-containing impurity amount (such as soil and the like) of different material types in the scrap steel are unknown, so the recycling amount of the tailings of the electric arc furnace does not form effective theoretical guidance, after the tailings are recycled for a plurality of times, the reduction range of the alkalinity of the slag is large, the corrosion of the viscosity to a furnace lining is aggravated, the slag with the low alkalinity is not beneficial to the generation and the stability of the foamed slag, the electric arc thermal efficiency is reduced, the energy consumption loss is increased, and the steelmaking cost is increased. The tailings are used for replacing partial lime for slagging, so that the lime consumption is reduced, the tailings are good foam slag, the foam slag can be quickly melted into slag when the foam slag is 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 certain oxidizability, and the metal yield is improved. The invention is to add SiO in the secondary slag without adding the tailings 2 Calculation of the increment, i.e. SiO introduced or produced by scrap 2 On the premise of ensuring that the alkalinity of the tailing-added furnace secondary final slag is more than or equal to 1.8, the tailing replaces lime with equal mass in a 1:1 mode for slagging, the maximum recycling amount of the furnace tailing is determined, namely the amount of the added lime is maximally reduced in a single time, and the tailing is maximally addedLime is replaced, and the cost of ton steel is reduced.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for reducing the consumption of lime in electric arc furnace steelmaking by recycling tailings, which can greatly reduce the consumption of lime so as to reduce the smelting cost.
The method adopts a horizontal continuous charging type electric arc furnace, and except for a first furnace, slag is left before smelting in other furnaces; aiming at different batches of waste steel without adding tailing, controlling the alkalinity of final slag to be 2.0-2.2, determining the addition of lime and dolomite, recording the addition of the waste steel, and calculating SiO (silicon dioxide) of the slag 2 Increment (i.e. SiO brought in or produced by scrap steel) 2 Amount); in the tailing adding process, the tailing replaces lime for slagging in a mass ratio of 1:1, and the maximum recycling amount of the tailing of the process is determined on the premise that the alkalinity of the final slag of the process is more than or equal to 1.8, namely the maximum lime addition amount is reduced in a single process, so that the lime consumption is reduced.
Wherein the mass of the remained slag is 8-10% of the steel tapping amount.
Slag SiO 2 The incremental calculation is as follows:
wherein: m Slag remaining The mass of the slag left before smelting is kg;
％CaO residue 1 The CaO content of the slag remained in the furnace without adding the tailings is percent;
％SiO 2 remaining of slag 1 SiO without adding tailings and remaining slag in the furnace 2 Content,%;
M lime (lime) 、M Dolomite The addition amount of the secondary lime and the dolomite is kg without adding the tailings;
％CaO lime 、％CaO Dolomite The CaO content of lime and dolomite is percent;
％CaO slag The CaO content of the secondary final slag without adding the tailings is percent;
％SiO 2 slag SiO without adding tailing slag and secondary and final slag 2 Content,%;
％SiO 2 lime 、％SiO 2 Dolomite SiO in lime and dolomite 2 Content,%;
SiO 2 increase Furnace secondary slag SiO without tailing 2 Increment, kg.
Before slagging, the tailings are crushed (generally to 30-50mm) and subjected to magnetic separation treatment to obtain tailings with CaO content of 35-40% and SiO content 2 The content is 18 to 20 percent, the content of FeO is 17 to 25 percent, and the content of MgO is 7 to 10 percent.
In the tailing adding furnace, according to the components of the tailing and the slag SiO corresponding to the adding amount of the waste steel of the tailing adding furnace 2 Increment, slag quality and components before smelting, and slag charge addition and components, and calculating the maximum lime addition reduction in a single time when the final slag alkalinity of the furnace is more than or equal to 1.8. Wherein, the scrap steel used in the tailing adding and tailing not adding furnace times is required to be the same batch so as to ensure the SiO of the slag involved in the calculation 2 The increments are the same.
The calculation process of the single maximum reduction lime addition is as follows:
wherein: m Lime 、M Dolomite The addition amount of the secondary lime and the dolomite is kg without adding the tailings;
％CaO lime 、％CaO Dolomite The CaO content of lime and dolomite is percent;
％SiO 2 lime 、％SiO 2 Dolomite SiO in lime and dolomite 2 Content,%;
M tailings -tailing addition, kg; namely the reduced lime addition;
％CaO tailings -the content of CaO in the tailings,%;
％SiO 2 tailings SiO in tailings 2 Content,%;
M slag remaining -mass of retained slag, kg;
％CaO residue 2 The CaO content of the slag left before the tailing slag is added for secondary smelting is percent;
％SiO 2 leaving slag 2 Slag SiO left before secondary smelting of tailing slag adding furnace 2 Content,%;
SiO 2 increase SiO in the secondary slag without adding tailings 2 Increment, kg;
eta is the ratio of the addition of the tailings to the addition of the secondary scrap without the tailings.
Before the tailings are added, the tailings are weighed, fully preheated through a horizontal preheating channel, dried and then added into a furnace.
In the method, the quality of the remaining slag is not too large or too small, and the excessive quality of the remaining slag can cause the excessive quantity of the slag in the next smelting process, the heat loss is increased and the corrosion of the furnace lining is aggravated; the remained slag has too low mass, which is not beneficial to the submerged arc smelting of the foam slag produced in the next adjacent furnace, and the heat efficiency of the electric arc is reduced.
The tailings have certain alkalinity, the alkalinity of the tailings is 1.8-2.2, and the tailings can be returned to be used for replacing partial lime for slagging.
When the tailings replace lime for slagging, the distribution of the scrap steel is uniform, and SiO brought or generated in each t of the scrap steel can be considered 2 The amounts are substantially the same.
1:1 of tailings replaces equal-mass lime for slagging, and the purpose is to calculate the maximum return amount of the tailings without increasing or reducing the slag amount, so that 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 not beneficial to submerged arc smelting, so that the thermal efficiency of the electric arc is reduced.
In the method, the steel charge without adding the tailings and the iron charge in the furnace with the tailings are the same batch of scrap steel, and can be continuous adjacent furnaces or discontinuous furnaces.
The technical scheme of the invention has the following beneficial effects:
(1) the invention provides a recycling method of metallurgical solid waste, which reduces environmental protection pressure, is beneficial to the green low-carbonization development 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 slagging lime, and reduces the production cost of ton steel.
(2) The electric furnace tailings contain part (FeO), and the tailings are used for replacing part of lime for slagging, so that the recovery of FeO in the tailings is facilitated, the metal yield is improved, and the production benefit is improved.
Drawings
FIG. 1 is a process flow diagram of the method for reducing the consumption of lime for electric arc furnace steelmaking by tailings recycling of the invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
The invention provides a method for reducing the consumption of lime for steelmaking 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 remained before smelting in other furnaces except a first furnace; aiming at different batches of waste steel without adding tailing, controlling the alkalinity of final slag to be 2.0-2.2, determining the addition of lime and dolomite, recording the addition of the waste steel, and calculating SiO (silicon dioxide) of the slag 2 Increment; in the tailing adding heat, the tailing replaces lime for slagging in a mass ratio of 1:1, and the maximum recycling amount of the tailing of the heat is determined on the premise that the alkalinity of the final slag of the heat is more than or equal to 1.8, namely the maximum lime addition amount is reduced in a single time, so that the lime consumption is reduced.
The electric furnace tailings are originally manufactured foam slag, the power consumption can be correspondingly reduced due to low melting point, the slag can be rapidly formed after the electric furnace tailings are returned for use, and the lime consumption is reduced.
The following description is given with reference to specific examples.
Example 1
No tailing addition heat: the mass of the remained slag is 8t, the adding amount of the smelting steel scrap is 86.8t, the content of CaO in the remained slag before smelting is 37.5 percent, and the content of SiO is 2 The content is 17.7 percent, the end-point slag CaO content is 38.5 percent, and SiO 2 The content is 18.1 percent, the alkalinity is 2.12, the tapping amount is 85.5t, and the adding amounts of slag charge lime and dolomite are respectively 32kg/t and 10 kg/t;
adding a tailing furnace time: the residue amount is 7.5t, and the scrap steel is smeltedThe addition amount is 87t, the CaO content of the tailings is 39.8 percent, and SiO is 2 The content is 19.1 percent, the content of CaO in the slag left before smelting is 40.1 percent, and SiO is 2 The content is 19.2%;
the treatment is carried out according to the following method:
(1) recording the addition of secondary scrap steel of a furnace without adding tailings as 86800kg, slag as 2736kg of lime and 855kg of dolomite, the CaO content of the slag left before smelting as 37.5 percent, and SiO 2 The content is 17.7 percent, the end-point slag CaO content is 38.5 percent, and SiO 2 The content was 18.1%.
(2) Calculation of SiO in slag 2 Increment:
wherein:
M lime 2736kg, which is the addition amount of lime;
M dolomite 855kg of dolomite;
M slag remaining 8000kg, which is the mass of the slag left before smelting;
％CaO lime 90 percent, which is the CaO content in the lime;
％CaO dolomite 30 percent of CaO in the dolomite;
％CaO slag 38.5 percent, which is the CaO content of the final slag;
％SiO 2 slag 18.1% of SiO in the final slag 2 The content;
％CaO residue 1 The CaO content of the slag remained in the furnace without the tailing is 37.5 percent;
％SiO 2 remaining slag 1 17.7 percent of SiO which is the residue of the furnace without the tailing 2 Content (c);
％SiO 2 lime 5% of SiO in lime 2 The content;
％SiO 2 Dolomite 4% of SiO in dolomite 2 The content;
substituting the above data into formula (1) to obtain: SiO 2 2 increase 1101kg, and the adding amount of scrap steel is 86.8tSiO in slag 2 And (4) increasing.
(3) CaO content in tailings of 39.8 percent and SiO content in tailings 2 The content was 19.1%.
(4) The content of CaO in the slag remained before the tailing addition and the secondary smelting is 40.1 percent, and the content of SiO in the slag remained before the tailing addition and the secondary smelting is 40.1 percent 2 The content is 19.2 percent, the adding amount of scrap steel is 87000kg, and the maximum return amount of the furnace tailings, namely the maximum lime adding amount is reduced in one time on the premise that the alkalinity of the furnace tailings is more than or equal to 1.8.
(5) Calculating the maximum recycling amount of the tailings:
wherein:
M lime (lime) 2736kg, which is the addition amount of lime without tailings;
M dolomite 855kg of dolomite;
％CaO lime 90 percent, which is the CaO content in the lime;
％CaO dolomite 30 percent of CaO in the dolomite;
％SiO 2 lime 5% of SiO in lime 2 Content (c);
％SiO 2 Dolomite 4% of SiO in dolomite 2 Content (c);
％CaO tailings 39.8 percent, which is the content of CaO in the tailings;
％SiO 2 tailings 19.1 percent of SiO in the tailings 2 Content (c);
M slag remaining 7500kg, which is the mass of the residue;
％CaO residue 2 40.1 percent of the total amount of CaO, which is the content of the residual slag before the secondary smelting of the tailing slag adding furnace;
％SiO 2 remaining slag 2 19.2 percent of SiO slag left before the secondary smelting of the tailing adding furnace 2 Content (c);
siO 2 increase 1101kg of SiO in slag when the adding amount of scrap steel is 86.8t 2 Incrementing;
and eta is 87000/86800, and the adding amount ratio of the added tailings to the secondary steel scrap without the added tailings.
Substituting the above data into formula (2), and obtaining M Tailings Less than 1111kg, namely 1111kg of the maximum recycling amount of the tailings, namely 1111kg of the lime added in a single time.
The recycling amount of the single tailings in the field experiment is 1100kg, the adding amount of the lime is 1700kg, the alkalinity of the final slag is 1.82, and the calculation result is basically consistent with that of the final slag, so that the method can be considered to have a certain guiding function.
Example 2
No tailing addition heat: the mass of the remained slag is 7.8t, the adding amount of the smelting scrap steel is 85.5t, the CaO content of the remained slag before smelting is 39.6 percent, and the SiO content is 2 The content of the slag is 18.6 percent, the content of the terminal slag CaO is 39 percent, and the content of the SiO is 2 The content is 18.7 percent, the alkalinity is 2.08, the steel tapping amount is 84.4t, and the adding amounts of slag charge lime and dolomite are respectively 34kg/t and 10 kg/t;
adding tailings for a heat time: the mass of the remained slag is 7.1t, the adding amount of the smelting scrap steel is 83.7t, the CaO content of the tailings is 38.9 percent, and the SiO content is 2 The content is 19.3 percent, the content of CaO in the slag left before smelting is 38.7 percent, and SiO is 2 The content is 18.8%;
calculating to obtain the SiO of the furnace slag according to the adding amount of the waste steel without the tailing added, the slag remained component before smelting and the final slag component 2 The increment is 1212 kg;
according to the components of the tailings, the addition amount of the scrap steel of the tailing furnace and the slag components left before smelting, the maximum recycling amount of the tailings of the furnace is determined to be 945kg 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 the lime is reduced for one time by 945 kg.
The single tailing recycling amount of a field experiment is 900kg, the lime addition amount 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 function.
Example 3
No tailing addition heat: the mass of the remained slag is 7.6t, the adding amount of the smelting scrap steel is 85.7t, the CaO content of the remained slag before smelting is 38.6 percent, and the SiO content is 2 The content of CaO in the end point slag is 18.1 percent, the content of CaO in the end point slag is 38.8 percent, and the content of SiO in the end point slag is 18.1 percent 2 18 percent of content, 2.15 of alkalinity, 84.6t of steel output and slag chargeThe adding amount of lime and dolomite is respectively 37kg/t and 10 kg/t;
adding tailings for a heat time: 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 content is 2 The content is 18.8 percent, the slag left before smelting comprises 37.9 percent of CaO and SiO 2 The content is 18 percent;
calculating to obtain the SiO of the furnace slag according to the adding amount of the waste steel without the tailing added, the slag remained component before smelting and the final slag component 2 The increment is 1219 kg;
according to the components of the tailings, the addition amount of the scrap steel of the tailing heat and the slag components left before smelting, the maximum recycling amount of the tailing of the heat is 1175kg under the premise that the alkalinity of the slag of the heat is more than or equal to 1.8, namely the addition amount of the lime is reduced 1175kg once.
The recycling amount of the single tailings in the field experiment is 1100kg, the adding amount of the lime is 2100kg, and the alkalinity of the final slag is 1.84, which basically accords with the calculation result, so that the method can be considered to have a certain guiding function.
Example 4
No tailing addition for the heat: the mass of the remained slag is 7.3t, the adding amount of the smelting waste steel is 86.6t, the CaO content of the remained slag before smelting is 38.5 percent, and SiO is added 2 The content is 17.6 percent, the end slag component CaO is 38.6 percent, and SiO is 2 The content is 17.9 percent, the alkalinity is 2.16, the steel tapping amount is 85.4t, and the adding amounts of slag charge lime and dolomite are respectively 34kg/t and 10 kg/t;
adding a tailing furnace time: 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 content is 2 The content is 18.6 percent, the content of CaO in the slag left before smelting is 36.9 percent, and SiO is 2 The content is 18 percent;
calculating to obtain the SiO of the furnace slag according to the adding amount of the waste steel without the tailing added, the slag remained component before smelting and the final slag component 2 The increment is 1169 kg;
according to the components of the tailings, the addition amount of the scrap steel of the tailing heat and the slag components left before smelting, on the premise of ensuring that the alkalinity of the slag of the heat is more than or equal to 1.8, the maximum recycling amount of the tailings of the heat is 1046kg, namely, the addition amount of lime is reduced by 1046kg once.
The single tailing recycling amount of a field experiment is 1000kg, the lime addition 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 function.
Example 5
No tailing addition heat: the mass of the remained slag is 8.1t, the adding amount of the smelting scrap steel is 90.2t, the CaO content of the remained slag before smelting is 38.1 percent, and the SiO content is 2 The content is 18.9 percent, the end-point slag CaO content is 39 percent, and SiO 2 The content is 18.9 percent, the alkalinity is 2.06, the steel tapping amount is 84.7t, and the adding amounts of slag charge lime and dolomite are respectively 30kg/t and 10 kg/t;
adding a tailing furnace time: 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 content is 2 The content is 19.4 percent, the content of CaO in the slag left before smelting is 38.6 percent, and SiO is 2 The content is 18.6%;
calculating to obtain the SiO of the furnace slag according to the adding amount of the waste steel without the tailing added, the slag remained component before smelting and the final slag component 2 The increment is 1035 kg;
according to the components of the tailings, the addition amount of the scrap steel of the tailing heat and the slag components left before smelting, the maximum recycling amount of the tailing of the heat is determined to be 1068kg on the premise of ensuring that the alkalinity of the slag of the heat is more than or equal to 1.8, namely, the addition amount of lime is reduced by 1068kg once.
The single tailing recycling amount of a field experiment is 1000kg, the lime addition 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 function.
While the foregoing is directed to the preferred embodiment of the present invention, it will be appreciated by those skilled in the art that various changes and modifications may be made therein without departing from the principles of the invention as set forth in the appended claims.
Claims (8)
1. A method for reducing the consumption of lime in the steel making of an electric arc furnace by recycling tailings is characterized in that a horizontal continuous charging type electric arc furnace is adopted, and the remaining slag is left before the smelting of other furnaces except a first furnace; aiming at different batches of steel scraps without adding tailing furnace times, controlling the alkalinity of final slag to be 2.0-2.2, and determiningAdding lime and dolomite, recording the adding amount of waste steel, and calculating SiO of slag 2 Incrementing; in the tailing adding heat, the tailing replaces lime for slagging by the mass of 1:1, and the maximum recycling amount of the tailing of the heat is determined on the premise that the alkalinity of the final slag of the heat is more than or equal to 1.8, namely the maximum lime addition amount is reduced in a single time, so that the lime consumption is reduced.
2. The method for reducing the consumption of lime for steelmaking of an electric arc furnace by recycling the tailings according to claim 1, wherein the mass of the retained slag is 8-10% of the steel tapping amount.
3. The method for reducing consumption of lime for steelmaking by an electric arc furnace by recycling the tailings as claimed in claim 1, wherein the SiO slag is 2 The incremental calculation is as follows:
wherein: m Slag remaining The mass of the slag left before smelting is kg;
％CaO residue 1 The CaO content of the slag remained in the furnace without adding the tailings is percent;
％SiO 2 remaining of slag 1 SiO without adding tailings and remaining slag in the furnace 2 Content,%;
M lime 、M Dolomite The addition amount of the secondary lime and the dolomite is kg without adding the tailings;
％CaO lime (lime) 、％CaO Dolomite The CaO content of lime and dolomite is percent;
％CaO slag The CaO content of the secondary final slag without adding the tailing is percent;
％SiO 2 slag SiO without adding tailing slag and secondary and final slag 2 Content,%;
％SiO 2 lime 、％SiO 2 Dolomite-lime, SiO in dolomite 2 Content,%;
SiO 2 increase SiO of furnace secondary slag without adding tailings 2 Increment, kg.
4. The method for recycling the tailings to reduce the consumption of lime for steelmaking by the electric arc furnace as claimed in claim 1, wherein the tailings are crushed and magnetically separated before slagging, and the obtained tailings contain 35-40% of CaO and SiO 2 The content is 18-20%, the content of FeO is 17-25%, and the content of MgO is 7-10%.
5. The method for reducing consumption of lime for steelmaking by an electric arc furnace according to claim 1, wherein the tailing adding heat is performed according to slag SiO corresponding to the addition of the tailing and the scrap steel of the tailing adding heat 2 Increment, slag quality and components before smelting, and slag charge addition and components, and calculating the maximum lime addition reduction in a single time when the final slag alkalinity of the furnace is more than or equal to 1.8.
6. The method for reducing consumption of lime for steelmaking by an electric arc furnace according to claim 5, wherein the calculation of the single maximum reduction of lime addition is as follows:
wherein: m Lime 、M Dolomite The addition amount of the secondary lime and the dolomite is kg without adding the tailings;
％CaO lime 、％CaO Dolomite The CaO content of lime and dolomite is percent;
％SiO 2 lime 、％SiO 2 Dolomite SiO in lime and dolomite 2 Content,%;
M tailings -tailings addition, kg;
％CaO tailings -the content of CaO in the tailings,%;
％SiO 2 tailings SiO in tailings 2 Content,%;
M slag remaining -the mass of the residue, kg;
％CaO residue 2 The CaO content of the slag left before the tailing slag is added for secondary smelting is percent;
％SiO 2 remaining slag 2 Slag SiO left before secondary smelting of tailing slag adding furnace 2 Content,%;
SiO 2 increase SiO in the secondary slag without adding tailings 2 Increment, kg;
eta is the ratio of the addition of the tailings to the addition of the secondary scrap without the tailings;
the calculated tailing adding amount M Tailings I.e. the reduced lime addition.
7. The method for reducing consumption of lime for steelmaking by an electric arc furnace according to claim 5, wherein the same batch of scrap steel is used for the tailing-added and non-tailing-added furnace runs to ensure the SiO of the slag involved in the calculation 2 The increments are the same.
8. The method for reducing consumption of lime for electric arc furnace steelmaking according to claim 4, wherein the crushed grain size of the tailings is 30-50 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210521578.6A CN115096071B (en) | 2022-05-13 | 2022-05-13 | Method for reducing consumption of steel-making lime of electric arc furnace by recycling tailings |
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| CN101831525A (en) * | 2010-05-19 | 2010-09-15 | 首钢总公司 | Dephosphorization method for molten iron |
| CN103468862A (en) * | 2013-09-26 | 2013-12-25 | 西宁特殊钢股份有限公司 | Efficient full-iron steelmaking method allowing molten iron to be added into pig iron in electric-arc furnace |
| RU2543658C1 (en) * | 2013-12-04 | 2015-03-10 | Публичное акционерное общество "Северсталь" (ПАО "Северсталь") | Method of steel making in arc-type electric steel making furnace |
| CN107385151A (en) * | 2017-07-15 | 2017-11-24 | 山西建龙实业有限公司 | A kind of recovery process of converter slag |
| CN110373511A (en) * | 2019-07-17 | 2019-10-25 | 邯郸钢铁集团有限责任公司 | A kind of converter smelting process of low lime consumption |
| CN111349746A (en) * | 2018-12-24 | 2020-06-30 | 新疆八一钢铁股份有限公司 | Process for replacing converter lime by using steelmaking tailings |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101831525A (en) * | 2010-05-19 | 2010-09-15 | 首钢总公司 | Dephosphorization method for molten iron |
| CN103468862A (en) * | 2013-09-26 | 2013-12-25 | 西宁特殊钢股份有限公司 | Efficient full-iron steelmaking method allowing molten iron to be added into pig iron in electric-arc furnace |
| RU2543658C1 (en) * | 2013-12-04 | 2015-03-10 | Публичное акционерное общество "Северсталь" (ПАО "Северсталь") | Method of steel making in arc-type electric steel making furnace |
| CN107385151A (en) * | 2017-07-15 | 2017-11-24 | 山西建龙实业有限公司 | A kind of recovery process of converter slag |
| CN111349746A (en) * | 2018-12-24 | 2020-06-30 | 新疆八一钢铁股份有限公司 | Process for replacing converter lime by using steelmaking tailings |
| CN110373511A (en) * | 2019-07-17 | 2019-10-25 | 邯郸钢铁集团有限责任公司 | A kind of converter smelting process of low lime consumption |
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