CN112011684A - Preparation method of iron-containing dust and mud pellets - Google Patents
Preparation method of iron-containing dust and mud pellets Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
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Abstract
The invention relates to the technical field of metallurgy, and discloses a preparation method of pellets containing iron dust and mud. The preparation method of the iron-containing dust mud pellets can realize the recovery of the ferrite, effectively control the S possibly entering the molten iron, retain the S in the slag, remove the S in the slag falling process of the molten iron and ensure the quality of the molten iron.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a preparation method of iron-containing dust and mud pellets.
Background
The iron-containing dust and mud are typical solid wastes of iron and steel metallurgy enterprises, and the resource utilization of the iron and mud is always a hot problem of the solid waste resource utilization of the iron and steel enterprises. Typical utilization ways include methods of back sintering utilization, torpedo tank car utilization, converter utilization, factory utilization, centralized treatment of rotary hearth furnaces and rotary kilns and the like. The method for utilizing the iron-containing dust mud is a method for utilizing the iron-containing dust mud which is researched and applied more.
The iron-containing dust and mud is a material with complex components, relates to a plurality of processes such as sintering, iron making, steel rolling and the like in the steel manufacturing process, comprises dozens of dust and mud varieties and hundreds of different dust or mud discharge ports, and contains 20-70% of unequal iron elements, so the iron-containing dust and mud is generally called as the iron-containing dust and mud. The existing method can utilize the iron oxide component in the iron-containing dust mud, and utilize the high temperature of the molten iron and the carbon added to reduce the iron oxide into iron, thereby realizing the purpose of resource recovery.
The Chinese patent application (published: 09/01/2010 and publication number: CN101818264B) discloses a method for treating zinc-containing and iron-containing dust mud, which comprises the steps of adding a certain amount of carbon into the iron-containing dust mud, putting natural particles or cold-bonded pellets into an empty molten iron tank, adding molten iron, and reducing the iron-carbon pellets by using the temperature of the molten iron to realize the recovery of metallic iron.
The Chinese invention patent application (published: 2011, 27.04.2011 and publication number: CN102031361B) discloses a method for comprehensive treatment and utilization of iron and steel dust and mud, which comprises the steps of calculating according to ingredients of various dust and mud to be treated, uniformly mixing by using mixing equipment, pressing into dust and mud briquettes with the thickness of 5-15 mm, drying the dried dust and mud briquettes at the temperature below 300 ℃, putting into a molten iron tank for preheating, and then adding molten iron for full reduction.
The Chinese invention patent application (published: 09.01.2018 and publication number: CN107557575A) discloses a process for treating metallurgical dust and mud waste, wherein 75-90 parts by weight of metallurgical dust and mud waste is added into a binder, the mixture is made into a briquette by a press machine, and the briquette is directly added into KR for stirring by a hopper, so that the recovery of metallic iron is realized.
In recent years, with the continuous upgrading of the strength of steel materials, the production requirement of clean steel is higher and higher, and the existing method for utilizing iron-containing dust mud pellets to return molten iron realizes the recovery of ferrite, but simultaneously brings a large amount of impurity elements into the molten iron, influences the quality of the molten iron and improves the smelting cost of steel-making process variety steel. In particular, S element in the dust and mud is easy to enter molten iron from slag to cause 'reversion', and has great influence on smelting low-sulfur steel products such as automobile plates and the like.
Disclosure of Invention
The invention aims to provide a method for preparing iron-containing dust and mud pellets, which can realize the recovery of ferrite, effectively control S element possibly entering molten iron, retain the S element in slag and remove the S element in the process of falling the slag in the molten iron, and ensure the quality of the molten iron.
In order to achieve the purpose, the preparation method of the iron-containing dust and mud pellets comprises the following steps:
A) detecting the components of the raw material containing iron dust mud if TFe is not less than 55.0% and SiO2At ≦ 4.5%, proceed to the next step; if TFe<55% or SiO2>4.5 percent of the mixture is added with the high-iron dust mud raw material, so that the TFe of the obtained mixture is not less than 55.0 percent and the SiO is not less than2≦4.5％；
B) Checking the content of the C element in the mixture obtained in the step A), and entering the next step if the TFe is that C is less than or equal to 4.7; if the TFe: C is more than 4.7, the carbon raw material is added, so that the TFe: C of the obtained mixture is less than or equal to 4.7;
C) checking the mixture obtained in step B) for CaO, MgO, SiO2、Al2O3、K2O、Na2O、MnO、P2O5、CaF2If the lambda is not less than 0.83, entering the next step; if Λ<0.83, adding quicklime powder to ensure that the obtained mixture Lambda is not less than 0.83;
D) uniformly mixing the mixture obtained in the step C), adding water to adjust the water content of the mixture to 8-12%, adding a binder accounting for 0.5-2% of the mass of the materials, and uniformly mixing;
E) feeding the material prepared in the step D) into a double-roller ball press to be pressed into pellets;
F) and E) drying the pellets prepared in the step E) at the temperature of 80-105 ℃ until the water content is less than 1.0%, thus preparing finished iron-containing dust mud pellets, and returning the finished iron-containing dust mud pellets to a torpedo ladle or a foundry ladle for use.
Preferably, in the step a), the iron-containing dust and mud raw material is a raw material obtained by grinding and drying one or more mixtures of dust and mud obtained by a dry or wet dust removal system in an iron-making or steel-making process, and the iron-containing dust and mud raw material comprises the following chemical components: TFe is more than or equal to 30.0 percent and less than or equal to 65.0 percent, CaO is less than or equal to 20.0 percent, MgO is less than or equal to 8.0 percent, and SiO2≤15.0％，Al2O3≤8.0％，MnO≤1.0％，K2O≤2.0％，Na2O≤2.0％，1.0％≤S≤3.0％，P2O5≤0.5％，CaF2Not more than 0.5 percent, not more than 5.0 percent of Zn, not more than 30.0 percent of C, not more than 1.0 percent of water, and the balance of O, H, N elements combined with elements such as Fe, Zn, S, C and the like and inevitable small amount of other impurity elements, wherein the iron-containing dust and mud raw material has the granularity characteristics that: the residue of 100-mesh sieve is less than or equal to 10.0 percent, and the residue of 20-mesh sieve is less than or equal to 1.0 percent.
Preferably, in the step a), the alkalinity of the chemical composition of the iron-containing dust sludge is characterized by R ═ CaO% + MgO%/(SiO θ ═ o%2％+Al2O3Not less than 0.88% by weight, and CaO%>MgO％，SiO2％>Al2O3％。
Preferably, in the step a), the high iron dust and mud raw material is obtained by drying one or more of iron dust and iron mud collected in a steel rolling process, and has the following chemical components: TFe is more than or equal to 68.0 percent and less than or equal to 73.0 percent, CaO is less than or equal to 2.0 percent, MgO is less than or equal to 1.0 percent, and SiO2≤1.5％，Al2O3≤1.0％，MnO≤0.5％，K2O≤1.0％，Na2O≤1.0％，S≤0.2％，P2O5≤0.2％，CaF2Not more than 0.2 percent, not more than 0.2 percent of Zn, not more than 0.5 percent of C, not more than 1.0 percent of water, and the balance of O, H, N elements combined with elements such as Fe, Zn, S, C and the like and inevitable small amount of other impurity elements, wherein the high-iron dust and mud raw material has the granularity characteristics that: the residue of 100-mesh sieve is less than or equal to 10.0 percent, and the residue of 20-mesh sieve is less than or equal to 1.0 percent.
Preferably, in the step B),the carbon raw material is obtained by grinding and drying coke powder and dry quenching dust removal powder, and is characterized by comprising the following components: more than or equal to 93.0 percent of C, less than or equal to 0.5 percent of TFe, less than or equal to 2.0 percent of CaO, less than or equal to 0.5 percent of MgO, and less than or equal to SiO2≤2.0％，Al2O3≤1.0％，MnO≤0.2％，K2O≤0.5％，Na2O≤0.5％，S≤0.2％，P2O5≤0.2％，CaF2Not more than 0.2 percent, not more than 0.2 percent of Zn, not more than 1.0 percent of water, and the balance of O, H, N elements combined with elements such as Fe, Zn, S, C and the like and inevitable small amount of other impurity elements, wherein the granularity of the carbon raw material is characterized in that: the residue of 200 mesh sieve is less than or equal to 20.0 percent, and the residue of 100 mesh sieve is less than or equal to 5.0 percent.
Preferably, in the step C), the quicklime powder is a raw material obtained by calcining, grinding and drying limestone, and the chemical components of the quicklime powder are that CaO is more than or equal to 90 percent, TFe is less than or equal to 1.0 percent, MgO is less than or equal to 5.0 percent, and SiO2≤2.0％，Al2O3≤1.0％，MnO≤0.5％，K2O≤1.0％，Na2O≤1.0％，S≤0.2％，P2O5≤0.2％，CaF2Not more than 0.2 percent, not more than 0.2 percent of Zn, not more than 0.5 percent of C, not more than 1.0 percent of water, and the balance of O, H, N elements combined with elements such as Fe, Zn, S, C and the like and inevitable small amount of other impurity elements, wherein the particle size of the quicklime powder is characterized in that: the residue of 200 mesh sieve is less than or equal to 20.0 percent, and the residue of 100 mesh sieve is less than or equal to 5.0 percent.
Preferably, in the step C), the optical basicity Λ of the theoretical slag may be defined according to the metallurgical thermodynamics thereof, and calculated according to the components of the theoretical slag and the optical basicity of each substance, and the expression is
Wherein, χBIs the total mole fraction of oxygen atoms in each component and is defined as chiB＝n(O)χ′B/∑n(O)χ′B，ΛBThe optical alkalinity of each component and the theoretical slag optical alkalinity lambda are the sum of the product of the mole fraction of each component and the optical alkalinity of each component.
Preferably, in the step D), the binder is one of medium temperature asphalt, carboxymethyl cellulose and polyvinyl alcohol, and in the step E), the pellet is a flat ball with a diameter of 5-8 cm.
Preferably, in the step B), the carbon raw material is added to obtain a mixture with TFe and C of 4.0-4.7.
Preferably, in the step C), the mixture obtained after adding quicklime is 0.83 ≦ Λ ≦ 0.87.
The principle of the invention is as follows:
iron-carbon pellets are added into molten iron, and iron oxide in the iron-carbon pellets is reduced into iron by using the heat of the molten iron, so that the iron-increasing of the molten iron is generally applied to various domestic steel mills. In the past, converter smelting is negative energy smelting, heat energy is rich, the requirement on the iron grade of iron-containing dust and mud pellets is low, and in recent years, large amount of heat is consumed for melting scrap steel along with the general prevalence of large scrap steel ratio smelting in China. For the iron-containing dust and mud pellets, if the iron grade is too low and the slag amount is large, the problem that a large amount of heat is taken away by the molten slag is caused, and the heat energy recovery technology of the molten slag is not mature and wastes. Therefore, the iron-containing dust and mud pellets need to have higher iron grade when being reused in a hot-metal ladle or a torpedo ladle, and waste of heat is avoided. The iron-containing dust and mud pellet TFe is preferably higher than 45% by combining the resource characteristics of a steel mill, and the higher the TFe is, the more heat is saved.
Generally, blast furnace smelting has requirements on slag fluidity, and the total alkalinity R of furnace burden is between 0.9 and 1.3 during blast furnace batching, so that the alkalinity of iron-containing dust and mud such as dust generated in a blast furnace area is between 0.9 and 1.3 generally. In order to meet the requirements of smelting such as desulfurization and forest removal in the steelmaking process, the alkalinity of slag in the steelmaking process is generally over 1.6, and the alkalinity of dust mud in the steelmaking process is also over 1.6. Meanwhile, the chemical composition of the iron-containing dust and mud in the iron-making and steel-making areas generally meets the CaO%>MgO％，SiO2％>Al2O3% of the characteristics.
Considering the requirement of the optical alkalinity of the iron-containing dust and mud pellets, in order to avoid the condition that the TFe of the iron-containing dust and mud pellets is too low due to the addition of too much quicklime powder, the TFe% and SiO need to be considered simultaneously in the step A)2% of the content; the high-iron raw material B is utilized to improve the TFe content and effectively reduce SiO2The content of the lime powder is reduced as much as possible.
The thermal reduction of the carbon-containing and iron-containing pellets has been studied in a large quantity, and the proportion of the mole number of C to the mole number of O is required to be more than 1: 1. Fe is used as Fe in the iron-containing dust and mud pellets0，Fe2+，Fe3+There are many forms, and generally, metallic iron MFe, although present, is present in low amounts, with iron oxide being the predominant form of ferrite. Because the C in the molten iron is in a saturated state and the molten iron is more and less, the C is excessive on the whole after the iron-containing dust and mud pellets are mixed with the molten iron, but because the dynamic conditions in the molten iron tank are poor, in order to ensure the reaction effect, a certain C content is preferably kept in the iron-containing dust and mud pellets, which is beneficial to the contact of C and iron oxide to promote the reaction, the experience shows that if the Fe in the iron-containing dust and mud pellets is totally FeO, the molar ratio of C to O is kept to be more than 1:1, namely the molar ratio of Fe to O is kept to be more than 1:1, and the mass ratio is converted, namely TFe: C is about 4.7. In practice, because iron-containing dust and mud generated in iron making processes such as blast furnace gas ash, gas mud and the like contain a large amount of C, the condition that the TFe (carbon loss) is less than or equal to 4.7 can be met, and because the C in the molten iron is saturated, redundant C is neutral and is not dissolved in ionic molten slag, and is dispersed in the slag and discharged along with the slag removing process before the pretreatment of the molten iron. When TFe to C appears in the pellet burden>4.7, a small amount of C can be supplemented by materials such as coke powder, dry quenching dust removal powder and the like. Certainly, the carbon is not suitable to be supplemented too much, so that the waste and the cost increase are avoided.
In addition, the theoretical analysis for avoiding the S element in the iron-containing dust and mud pellets from entering the molten iron is as follows:
the S element conversion process between the molten iron and the slag can be expressed by an ion reaction mechanism:
[S]+(O2-)＝(S2-)+[O]
the distribution coefficient of S is defined as the ratio of the S content in the slag to the S content in the molten iron by mass fraction, and can be expressed as:
concepts such as sulfur capacity, oxygen potential, optical alkalinity and the like are introduced, and the concepts can be obtained according to related theories of ferrous metallurgy principles:
the following relations are collated:
the formula (1) is a distribution coefficient expression of S, and shows that the distribution relation of the S element among slag metals is related to the optical alkalinity and temperature of slag and the activity coefficient of sulfur in molten iron.
The optical basicity Λ in formula (1) can be calculated according to its definition, according to the optical basicity of each substance and the composition of slag.
(in the formula, x%BIs the total mole fraction of oxygen atoms in each component, ΛBThe optical alkalinity of each component and the theoretical slag optical alkalinity lambda are the sum of the product of the oxygen atom mole fraction in each component and the optical alkalinity of each substance component. )
TABLE 1 optical basicity Λ of various substancesB
The activity coefficient term lgfs of sulfur in molten iron in the formula (1) can be calculated according to the interaction coefficient of substances in the molten metal and the data of main components of the molten iron, and the numerical value at different temperatures is calculated according to a quasi-normal solution model and combined with 1837K literature data.
TABLE 2 interaction coefficients at different temperatures
TABLE 3 typical content of major elements in molten iron (%)
| Element(s) | C | Si | Mn | P |
| Composition (I) | 4 | 0.35 | 0.33 | 0.1 |
Lgf can be calculated for the activity coefficient term lgfs of sulfur at 1773K in combination with tables 2 and 3S＝0.498。
When a general blast furnace is tapped and loaded into a hot metal ladle or a torpedo ladle, the initial temperature of molten iron is about 1500 ℃ (1773K), the temperature drop is about 50-200 ℃ before steel making, according to the formula (1), the distribution coefficient of sulfur is inversely proportional to the temperature, and the temperature drop is favorable for S element to migrate into slag. Therefore 1773K can be considered as an extreme case to eliminate the effect of temperature.
The iron-containing dust and mud pellets are generally added into an empty tank in advance when the empty tank of a hot metal tank or a fish tank returns, the iron-containing dust and mud pellets are added into an iron receiving port, when molten iron is added, the temperature and the element C are sufficient, iron oxide quickly reacts into iron, the boiling point of element Zn is lower, the iron oxide quickly evaporates and enters into the dust removal ash at an iron outlet along with dust, and the element C is insoluble in slag, so that after the iron-containing dust and mud pellets are completely melted by heating, conceivably, theoretical slag formed on the surface of the molten iron mainly comprises CaO, MgO and SiO2、Al2O3、K2O、Na2O、MnO、P2O5、CaF2And the like.
The typical value of lgfs at 1773K and 1773K is taken to 1, Ls is taken to 10, and Λ is 0.83, that is, when the optical basicity of theoretical slag is greater than 0.83, under the thermal equilibrium state, the element S in slag is higher than the element S in molten iron by one order of magnitude. The content of S in the molten iron is between 0.7 and 1.5 percent, the S content is equivalent to the content of S in the iron-containing dust and mud pellets, when the lambda is larger than or equal to 0.83, the sulfur in the molten iron tends to transfer into slag, and the molten slag has certain molten iron desulphurization capability, so that S impurities in the iron-containing dust and mud pellets cannot be brought into the molten iron when the iron-containing dust and mud pellets are reused in a molten iron tank or a torpedo tank.
Compared with the prior art, the invention has the following advantages:
1. the iron-containing dust and mud pellets prepared by the method have high iron content and less slag amount, are beneficial to effectively utilizing the heat of molten iron and avoid generating excessive molten slag to lose unnecessary heat;
2. compared with the prior art, the method has less attention to impurity elements when similar iron-containing dust and mud pellets are prepared in the past, and the method realizes effective control of the S element entering the molten iron through the analysis and practice of the metallurgical thermodynamic principle, thereby meeting the new requirements of the current clean steel production;
3. by scientific and reasonable metallurgical thermodynamic calculation, excessive addition of slagging materials such as quicklime and the like is avoided, and the slag quantity and heat loss are effectively controlled;
4. the organic binder is used for combining pressure forming, the pellet has high cold strength, is not easy to break in the transportation process, is not easy to generate dust when being added into a hot metal ladle or a fish tank, and is safe and environment-friendly;
5. the pellet can also be used for desulfurization or converter, and is a multipurpose iron-containing dust and mud product.
Drawings
Fig. 1 is a flow chart of the method for preparing iron-containing sludge pellets according to the present invention.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments.
Example one (as shown in fig. 1):
A) the raw material components of the iron-containing dust and mud used for detection are as follows: TFe 31.7%, CaO 12.8%, MgO 5.1%, sio213.7%, al2o36.4%, MnO 0.6%, K2O 0.9%, Na2O 0.7%, S1.8%, P2O50.2%, caf 20.4, Zn 1.8%, C13.2%, moisture 0.5%, iron-containing dust raw material with particle size characteristics: 10.0 percent of sieve residue of 100 meshes, 0.8 percent of sieve residue of 20 meshes, 55.0 percent of TFe and 4.5 percent of SiO2, and high-iron dust and mud raw materials need to be added;
the high-iron dust and mud comprises the following raw materials: TFe 69.7%, CaO 1.5%, MgO 0.6%, SiO2 1.2％，Al2O30.4％，MnO 0.2％，K2O 0.3％，Na2O 0.4％，S 0.5％，P2O0.1％，CaF20.1 percent, 0.0 percent of Zn, 0.2 percent of C, 0.5 percent of water, and the granularity characteristics of the high-iron dust and mud raw materials are as follows: the residue of a 100-mesh sieve is 9.0 percent, and the residue of a 20-mesh sieve is 0.8 percent;
mixing an iron-containing dust mud raw material and a high-iron dust mud raw material according to a ratio of 1:3, wherein the obtained mixture comprises the following chemical components: TFe 60.2%, CaO 4.3%, MgO 1.7%, SiO2 4.3％，Al2O3 1.9％，MnO 0.3％，K2O 0.4％，Na2O 0.5％，S 0.5％，P2O5 0.1％，CaF20.2, 0.4% Zn, 3.4% C, 0.5% water, 55.0% TFe and SiO2At ≦ 4.5%, proceed to the next step;
B) checking the mixture TFe obtained in the step A), wherein C is 17.7 and is more than 4.7, and carbon raw materials are required to be added;
the carbon raw material comprises the following components: 94.7% of C, 0.2% of TFe, 1.3% of CaO, 0.3% of MgO, and SiO2 1.0％，Al2O30.6％，MnO 0.1％，K2O 0.2％，Na2O 0.1％，S 0.1％，P2O5 0.1％，CaF20.0 percent, 0.0 percent of Zn, 0.4 percent of water, and the granularity characteristics of the carbon raw material are as follows: the sieve residue of the 200-mesh sieve is 20.0 percent, and the sieve residue of the 100-mesh sieve is 4 percent;
adding a carbon raw material C with the mass ratio of 10.5% into the mixture obtained in the step A), wherein the chemical components of the mixture are as follows: TFe 55.0%, CaO 4.0%, MgO 1.6%, SiO2 4.0％，Al2O3 1.8％，MnO 0.3％，K2O 0.4％，Na2O 0.5％，S 0.5％，P2O5 0.1％，CaF20.2%, Zn 0.4%, C12.1%, water 0.5%, TFe, C4.5 ≦ 4.7, and proceeding to the next step;
C) checking the optical basicity Lambda of the theoretical slag of the mixture obtained in the step B);
TABLE 3 calculation of the optical basicity of the slag
χB＝n(O)χ′B/∑n(O)χ′BWherein n (O) represents the number of oxygen atoms in the chemical formula of each substance.
Wherein ∑ n (O) χ'B
＝1×0.33+1×0.19+2×0.34+3×0.08+1×0.02+1×0.04+1×0.02+5×0.00+1×0.01＝1.53
Λ is less than 0.83, and quicklime powder is required to be added;
the quicklime powder comprises the following components: CaO 92.8%, TFe 0.7%, MgO 3.1%, SiO2 1.2％，Al2O3 0.4％，MnO 0.0％，K2O 0.2％，Na2O 0.3％，S 0.0％，P2O5 0.0％，CaF20.0 percent, 0.0 percent of Zn, 0.0 percent of C, 0.9 percent of water, and the particle size characteristics of quicklime powder are as follows: the residue of the 200-mesh sieve is 19.0 percent, and the residue of the 100-mesh sieve is 4.3 percent;
adding 20.0 percent of quicklime powder by mass into the mixture obtained in the step B), wherein the chemical components of the mixture are as follows: 46.0 percent of TFe, 18.8 percent of CaO, 1.8 percent of MgO and SiO2 3.5％，Al2O3 1.6％，MnO 0.2％，K2O 0.4％，Na2O 0.5％，S 0.4％，P2O5 0.1％，CaF20.2, 0.3 percent of Zn, 10.1 percent of C and 0.6 percent of water, checking the optical basicity of the theoretical slag of the mixture:
TABLE 4 calculation of optical basicity of slag
χB＝n(O)χ′B/∑n(O)χ′B
Wherein ∑ n (O) χ'B
＝1×0.71+1×0.09+2×0.12+3×0.03+1×0.01+1×0.02+1×0.00+5×0.00+1×0.00＝1.16
Lambda is not less than 0.83, and the next step is carried out;
D) uniformly mixing the mixture obtained in the step C), adding water to adjust the water content of the mixture to 9%, adding a medium-temperature asphalt binder accounting for 1.5% of the above materials, and uniformly mixing;
E) feeding the material prepared in the step D) into a double-roller ball press machine to be pressed into flat balls with the diameter of 5-8 cm;
F) and E) drying the pellets prepared in the step E) at the temperature of 80-105 ℃ until the water content is 0.5%, thus preparing finished iron-containing dust mud pellets which can be returned to a torpedo ladle or a ladle for use.
Example two:
A) the raw material components of the iron-containing dust and mud used for detection are as follows: 40.5% of TFe, 5.2% of CaO, 2.3% of MgO, 25.1% of SiO25, 31.2% of Al2O31, 0.3% of MnO, 0.4% of K2O 0.4, 0.3% of Na2O 0.3, 1.3% of S, P2O50.1%, CaF20.2, 2.1% of Zn, 25.7% of C, 0.4% of moisture, and the iron-containing dust mud raw material has the particle size characteristics that: 9.0 percent of residue of 100-mesh sieve, 1.0 percent of residue of 20-mesh sieve and TFe<55.0% and SiO2>4.5 percent of high-iron dust and mud raw materials are required to be added;
the high-iron dust and mud comprises the following raw materials: 70.5 percent of TFe, 1.6 percent of CaO, 0.5 percent of MgO and SiO2 0.8％，Al2O30.5％，MnO 0.2％，K2O 0.3％，Na2O 0.3％，S 0.1％，P2O5 0.0％，CaF20.0 percent, 0.0 percent of Zn, 0.2 percent of C, 0.7 percent of water, and the granularity characteristics of the high-iron dust and mud raw materials are as follows: the residue of a 100-mesh sieve is 8.0 percent, and the residue of a 20-mesh sieve is 1.0 percent;
uniformly mixing an iron-containing dust mud raw material and a high-iron dust mud raw material according to a ratio of 1:1, wherein the obtained mixture comprises the following chemical components: TFe 55.5%, CaO 3.4%, MgO 1.4%, SiO2 3.0％，Al2O3 0.8％，MnO 0.2％，K2O 0.4％，Na2O 0.3％，S 0.7％，P2O5 0.0％，CaF20.1%, Zn 1.0%, C13.0%, water 0.6%, TFe ≧ 55.0% and SiO2<4.5%, entering the next step;
B) checking the mixture obtained in step a) for TFe, C4.3 <4.7, going to the next step;
C) checking the optical basicity Lambda of the theoretical slag of the mixture obtained in the step B);
TABLE 5 calculation of optical basicity of slag
χB＝n(O)χ′B/∑n(O)χ′B
Wherein ∑ n (O) χ'B
＝1×0.37+1×0.21+2×0.30+3×0.05+1×0.02+1×0.03+1×0.02+5×0.00+1×0.00＝1.40
Λ is less than 0.83, and quicklime powder is required to be added;
the quicklime powder comprises the following components: CaO 92.6%, TFe 0.3%, MgO 2.2%, SiO2 1.8％，Al2O3 0.6％，MnO 0.2％，K2O 0.3％，Na2O 0.5％，S 0.1％，P2O5 0.1％，CaF20.1%, Zn 0.1%, C0.2%, water 0.7%, the particle size characteristics of quicklime powder are: the sieve residue of the 200-mesh sieve is 17.0 percent, and the sieve residue of the 100-mesh sieve is 4.5 percent;
adding quicklime powder with the mass ratio of 15.0% into the mixture obtained in the step B), wherein the chemical components of the mixture are as follows: TFe 48.2%, CaO 15.0%, MgO 1.5%, SiO2 2.8％，Al2O3 0.8％，MnO 0.2％，K2O 0.4％，Na2O 0.3％，S 0.6％，P2O5 0.0％，CaF20.1, 0.9% of Zn, 11.3% of C and 0.6% of water, and checking the optical basicity of the theoretical slag of the mixture:
TABLE 6 calculation of optical basicity of slag
χB＝n(O)χ′B/∑n(O)χ′B
Wherein ∑ n (O) χ'B
＝1×0.72+1×0.10+2×0.12+3×0.02+1×0.02+1×0.01+1×0.01+5×0.00+1×0.00＝1.16
Lambda is not less than 0.83, and the next step is carried out;
D) uniformly mixing the mixture obtained in the step C), adding water to adjust the water content of the mixture to 10%, adding 1.2% of carboxymethyl cellulose of the above materials, and uniformly mixing;
E) feeding the material prepared in the step D) into a double-roller ball press machine to be pressed into flat balls with the diameter of 5-8 cm;
F) and E) drying the pellets prepared in the step E) at the temperature of 80-105 ℃ until the water content is 0.8%, thus preparing finished iron-containing dust mud pellets which can be returned to a torpedo ladle or a ladle for use.
Example three:
A) the raw material components of the iron-containing dust and mud used for detection are as follows: 47.9% of TFe, 10.8% of CaO, 3.9% of MgO, 27.4% of SiO27, 34.1% of Al2O34, 0.8% of MnO, 0.5% of K2O 0.5, 0.8% of Na2O 0.8, 1.7% of S, P2O50.4%, CaF20.2, 2.3% of Zn, 2.2% of C, 0.4% of moisture, and the iron-containing dust and mud raw material has the particle size characteristics that: 8.0 percent of residue of 100-mesh sieve, 0.9 percent of residue of 20-mesh sieve and TFe<55.0% and SiO2>4.5 percent of high-iron dust and mud raw materials are required to be added;
the high-iron dust and mud comprises the following raw materials: TFe 71.3%, CaO 1.2%, MgO 0.4%, SiO2 0.7％，Al2O30.3％，MnO 0.3％，K2O 0.2％，Na2O 0.2％，S 0.1％，P2O5 0.0％，CaF20.0 percent, 0.0 percent of Zn, 0.0 percent of C, 0.6 percent of water, and the granularity characteristics of the high-iron dust and mud raw materials are as follows: the residue of a 100-mesh sieve is 10.0 percent, and the residue of a 20-mesh sieve is 0.7 percent;
uniformly mixing an iron-containing dust mud raw material and a high-iron dust mud raw material according to a ratio of 1:1, wherein the obtained mixture comprises the following chemical components: TFe 59.6%，CaO 6.0％，MgO 2.2％，SiO2 4.0％，Al2O3 2.2％，MnO 0.6％，K2O 0.4％，Na2O 0.5％，S 0.9％，P2O5 0.2％，CaF20.1 percent of Zn, 1.2 percent of C, 1.1 percent of water, 0.5 percent of TFe ≧ 55.0 percent and SiO2<4.5%, entering the next step;
B) checking the mixture TFe obtained in the step A), wherein C is 54.2 and 4.7, and carbon raw materials are required to be added;
the carbon raw material C comprises the following components: 95.3 percent of C, 0.2 percent of TFe, 1.2 percent of CaO, 0.4 percent of MgO, and SiO2 1.1％，Al2O3 0.4％，MnO 0.2％，K2O 0.2％，Na2O 0.2％，S 0.1％，P2O5 0.0％，CaF20.0 percent, 0.0 percent of Zn, 0.6 percent of water, and the granularity characteristics of the carbon raw materials are as follows: the sieve residue of the 200-mesh sieve is 18.0 percent, and the sieve residue of the 100-mesh sieve is 5.0 percent;
adding a carbon raw material with the mass ratio of 12.5% into the mixture obtained in the step A), wherein the chemical components of the mixture are as follows: TFe 53.0%, CaO 5.5%, MgO 2.0%, SiO2 3.7％，Al2O3 2.0％，MnO 0.6％，K2O 0.4％，Na2O 0.5％，S 0.8％，P2O5 0.2％，CaF20.1%, Zn 1.1%, C11.6%, water 0.5%, TFe, C4.6 ≦ 4.7, and proceeding to the next step;
C) checking the optical basicity Lambda of the theoretical slag of the mixture obtained in the step B);
TABLE 7 calculation of optical basicity of slag
χB＝n(O)χ′B/∑n(O)χ′B
Wherein ∑ n (O) χ'B
＝1×0.39+1×0.20+2×0.24+3×0.08+1×0.02+1×0.03+1×0.04+5×0.00+1×0.00＝1.40
Λ is less than 0.83, and quicklime powder is required to be added;
the quicklime powder comprises the following components: 91.3% CaO, 0.3% TFe, 4.1% MgO, SiO2 1.3％，Al2O3 0.5％，MnO 0.3％，K2O 0.4％，Na2O 0.5％，S 0.1％，P2O5 0.0％，CaF20.0 percent, 0.0 percent of Zn, 0.3 percent of C, 0.8 percent of water, and the particle size characteristics of quicklime powder are as follows: the sieve residue of the 200-mesh sieve is 19.0 percent, and the sieve residue of the 100-mesh sieve is 5.0 percent;
adding quicklime powder with the mass ratio of 17.0% into the mixture obtained in the step B), wherein the chemical components of the mixture are as follows: TFe 45.3%, CaO 18.0%, MgO 2.3%, SiO2 3.4％，Al2O3 1.8％，MnO 0.6％，K2O 0.4％，Na2O 0.5％，S 0.7％，P2O5 0.2％，CaF20.1, 0.9% of Zn, 10.0% of C and 0.5% of water, and checking the optical basicity of the theoretical slag of the mixture:
TABLE 8 calculation of optical basicity of slag
χB＝n(O)χ′B/∑n(O)χ′B
Wherein ∑ n (O) χ'B
＝1×0.68+1×0.12+2×0.12+3×0.04+1×0.01+1×0.02+1×0.02+5×0.00+1×0.00＝1.21
Lambda is not less than 0.83, and the next step is carried out;
D) uniformly mixing the mixture obtained in the step C), adding water to adjust the water content of the mixture to 11%, adding polyvinyl alcohol accounting for 1.8% of the materials, and uniformly mixing;
E) feeding the material prepared in the step D) into a double-roller ball press machine to be pressed into flat balls with the diameter of 5-8 cm;
F) and E) drying the pellets prepared in the step E) at the temperature of 80-105 ℃ until the water content is 0.6%, thus preparing finished iron-containing dust mud pellets which can be returned to a torpedo ladle or a ladle for use.
Example four:
A) the raw material components of the iron-containing dust and mud used for detection are as follows: 60.6% of TFe, 3.2% of CaO, 1.9% of MgO, 22.7% of SiO22, 31.3% of Al2O31, 0.4% of MnO, 0.3% of K2O 0.3, 0.3% of Na2O 0.3, 1.0% of S, P2O50.2%, CaF20.2, 1.4% of Zn, 3.6% of C, 0.5% of moisture, and the iron-containing dust mud raw material has the particle size characteristics that: 8.0 percent of residue after 100-mesh sieve, less than or equal to 0.7 percent of residue after 20-mesh sieve, not less than 55.0 percent of TFe and SiO2<4.5%, entering the next step;
B) checking TFe of iron-containing dust mud raw material in the step A), wherein C is 17.1 and is more than 4.7, and carbon raw material is required to be added;
the carbon raw material comprises the following components: 94.2% of C, 0.3% of TFe, 1.4% of CaO, 0.7% of MgO, and SiO2 1.0％，Al2O30.5％，MnO 0.1％，K2O 0.3％，Na2O 0.4％，S 0.1％，P2O5 0.1％，CaF20.0 percent, 0.0 percent of Zn, 0.8 percent of water, and the granularity characteristics of the carbon raw material are as follows: the sieve residue of the 200-mesh sieve is 17.0 percent, and the sieve residue of the 100-mesh sieve is 4.5 percent;
adding a carbon raw material with the mass ratio of 10.0% into the iron-containing dust mud raw material in the step A), wherein the obtained mixture comprises the following chemical components: TFe 55.1%, CaO 3.0%, MgO 1.8%, SiO2 2.5％，Al2O3 1.2％，MnO 0.4％，K2O 0.3％，Na2O 0.3％，S 0.9％，P2O5 0.2％，CaF20.2%, Zn 1.3%, C11.8%, water 0.5%, TFe, C4.7 ≦ 4.7, and proceeding to the next step;
C) checking the optical basicity Lambda of the theoretical slag of the mixture obtained in the step B);
TABLE 9 calculation of optical basicity of slag
χB＝n(O)χ′B/∑n(O)χ′B
Wherein ∑ n (O) χ'B
＝1×0.32+1×0.27+2×0.24+3×0.07+1×0.02+1×0.03+1×0.04+5×0.00+1×0.01＝1.38
Λ is less than 0.83, and quicklime powder is required to be added;
the quicklime powder comprises the following components: CaO 95.2%, TFe 0.7%, MgO 1.2%, SiO2 0.6％，Al2O3 0.3％，MnO 0.2％，K2O 0.3％，Na2O 0.3％，S 0.1％，P2O5 0.0％，CaF20.0 percent, 0.0 percent of Zn, 0.1 percent of C, 0.7 percent of water, and the particle size characteristics of quicklime powder are as follows: the sieve residue of the 200-mesh sieve is 20.0 percent, and the sieve residue of the 100-mesh sieve is 4.0 percent;
adding quicklime powder with the mass ratio of 17.0% into the mixture obtained in the step B), wherein the chemical components of the mixture are as follows: 47.2 percent of TFe, 16.4 percent of CaO, 1.7 percent of MgO, and SiO2 2.2％，Al2O3 1.1％，MnO 0.4％，K2O 0.3％，Na2O 0.3％，S 0.8％，P2O5 0.2％，CaF20.2, 1.1% of Zn, 10.1% of C and 0.5% of water, and checking the optical basicity of the theoretical slag of the mixture:
TABLE 10 calculation of optical basicity of slag
χB＝n(O)χ′B/∑n(O)χ′B
Wherein ∑ n (O) χ'B
＝1×0.74+1×0.10+2×0.09+3×0.03+1×0.00+1×0.01+1×0.01+5×0.00+1×0.00＝1.16
Lambda is not less than 0.83, and the next step is carried out;
D) uniformly mixing the mixture obtained in the step C), adding water to adjust the water content of the mixture to 8%, adding polyvinyl alcohol accounting for 1.5% of the above materials, and uniformly mixing;
E) feeding the material prepared in the step D) into a double-roller ball press machine to be pressed into flat balls with the diameter of 5-8 cm;
F) and E) drying the pellets prepared in the step E) at the temperature of 80-105 ℃ until the water content is 0.8%, thus preparing finished iron-containing dust mud pellets which can be returned to a torpedo ladle or a ladle for use.
Comparative example:
the pellets of the example and the pellets of the comparative example, which are prepared by using the conventional iron-containing dust and mud pellets without strict composition control as the comparative example (the content of TFe and C are equivalent to those of the example), are added to molten iron for comparison with the above examples, and are compared with the resulfurization of molten iron, and the compositions of the pellets of the example and the pellets of the comparative example are shown in Table 11:
TABLE 11. examples and comparative examples contain iron dust mud pellet composition
| TFe | Cao | MgO | SiO2 | Al2O3 | MnO | K2O | Na2O | S | P2O5 | CaF2 | Zn | C | Moisture content | |
| Example 1 | 45.4 | 18.8 | 1.8 | 3.5 | 1.6 | 0.2 | 0.4 | 0.5 | 0.4 | 0.1 | 0.2 | 0.3 | 10.1 | 0.6 |
| Example 2 | 48.2 | 15.0 | 1.5 | 2.8 | 0.2 | 0.2 | 0.4 | 0.3 | 0.6 | 0.0 | 0.1 | 0.9 | 11.3 | 0.6 |
| Example 3 | 45.3 | 18.0 | 2.3 | 3.4 | 1.8 | 0.6 | 0.4 | 0.5 | 0.7 | 0.2 | 0.1 | 0.9 | 10.0 | 0.5 |
| Example 4 | 47.2 | 16.4 | 1.7 | 2.2 | 1.1 | 0.4 | 0.3 | 0.3 | 0.8 | 0.2 | 0.2 | 1.1 | 10.1 | 0.5 |
| Comparative example 1 | 49.7 | 5.7 | 2.9 | 4.4 | 2.6 | 0.5 | 0.6 | 0.5 | 0.7 | 0.2 | 0.4 | 2.2 | 11.8 | 0.5 |
Before the hot-metal ladle enters a blast furnace taphole, a certain amount of iron-containing dust and mud pellets are put into the hot-metal ladle in advance, and the amount of the put-in is 5 tons of iron-containing dust and mud pellets per 100 tons of hot-metal. Detecting the S content and the temperature of the molten iron after iron adding, and detecting the temperature and the S content of the molten iron again before the molten iron is transported to desulfurization pretreatment, wherein the test results are shown in the table 12:
TABLE 12 influence of iron-containing dust and sludge pellets on the reversion and temperature drop of molten iron in examples and comparative examples
As can be seen from table 12, the pellets in the examples have less influence on temperature drop compared with the pellets in the comparative examples, but for the impurity S element, the pellets in the examples can ensure that the molten iron is not resulfurized, and even play a little role in desulfurization, while the pellets in the comparative examples contain iron dust mud, and a large amount of S element is transferred to the molten iron, so that the molten iron is resulfurized, and the subsequent desulfurization cost and the desulfurization process time are increased. Meanwhile, the more iron-containing dust and mud pellets are added, the more obvious the control effect of the embodiment and the comparative example on the element S is. The iron-containing dust and mud pellets in the use embodiment can further improve the doping amount and utilize the temperature of molten iron. In the comparative example, the addition amount of S is increased, so that the addition amount is required to be controlled during use, and the addition amount is not suitable to be large. Therefore, the application effect of the embodiment is obviously better than that of the comparative example.
The iron-containing dust and mud pellets prepared by the method have high iron content and less slag amount, are beneficial to effectively utilizing the heat of molten iron and avoid generating excessive molten slag to lose unnecessary heat; compared with the prior art, the method has less attention to impurity elements when similar iron-containing dust and mud pellets are prepared in the past, and the method realizes effective control of the S element entering the molten iron through the analysis and practice of the metallurgical thermodynamic principle, thereby meeting the new requirements of the current clean steel production; in addition, through scientific and reasonable metallurgical thermodynamic calculation, excessive addition of slagging materials such as quicklime and the like is avoided, and the slag quantity and heat loss are effectively controlled; the pellet is formed by combining organic binder and pressure, has high cold strength, is not easy to break in the transportation process, is not easy to generate dust when being added into a hot metal ladle or a fish tank, and is safe and environment-friendly; the pellet can also be used for desulfurization or converter, and is a multipurpose iron-containing dust and mud product.
Claims (10)
1. The preparation method of the iron-containing dust and mud pellets is characterized by comprising the following steps: the method comprises the following steps:
A) detecting the components of the raw material containing iron dust mud if TFe is not less than 55.0% and SiO2At ≦ 4.5%, proceed to the next step; if TFe<55％Or SiO2>4.5 percent of the mixture is added with the high-iron dust mud raw material, so that the TFe of the obtained mixture is not less than 55.0 percent and the SiO is not less than2≦4.5％；
B) Checking the content of the C element in the mixture obtained in the step A), and entering the next step if the TFe is that C is less than or equal to 4.7; if the TFe: C is more than 4.7, the carbon raw material is added, so that the TFe: C of the obtained mixture is less than or equal to 4.7;
C) checking the mixture obtained in step B) for CaO, MgO, SiO2、Al2O3、K2O、Na2O、MnO、P2O5、CaF2If the lambda is not less than 0.83, entering the next step; if Λ<0.83, adding quicklime powder to ensure that the obtained mixture Lambda is not less than 0.83;
D) uniformly mixing the mixture obtained in the step C), adding water to adjust the water content of the mixture to 8-12%, adding a binder accounting for 0.5-2% of the mass of the materials, and uniformly mixing;
E) feeding the material prepared in the step D) into a double-roller ball press to be pressed into pellets;
F) and E) drying the pellets prepared in the step E) at the temperature of 80-105 ℃ until the water content is less than 1.0%, thus preparing finished iron-containing dust mud pellets, and returning the finished iron-containing dust mud pellets to a torpedo ladle or a foundry ladle for use.
2. The method for preparing iron-containing sludge pellets according to claim 1, wherein the method comprises the following steps: in the step A), the iron-containing dust and mud raw material is obtained by grinding and drying one or more of dust and mud mixtures obtained by a dry method or a wet method dust removal system in an iron-making or steel-making process, and the iron-containing dust and mud raw material is characterized by comprising the following chemical components: TFe is more than or equal to 30.0 percent and less than or equal to 65.0 percent, CaO is less than or equal to 20.0 percent, MgO is less than or equal to 8.0 percent, and SiO2≤15.0％，Al2O3≤8.0％，MnO≤1.0％，K2O≤2.0％，Na2O≤2.0％，1.0％≤S≤3.0％，P2O5≤0.5％，CaF2Not more than 0.5 percent, not more than 5.0 percent of Zn, not more than 30.0 percent of C, not more than 1.0 percent of water, and the balance of O, H, N elements combined with elements such as Fe, Zn, S, C and the like and inevitable small amount of other impurity elements, wherein the particle size of the iron-containing dust and mud raw material is less than or equal to 0.5 percentIs characterized in that: the residue of 100-mesh sieve is less than or equal to 10.0 percent, and the residue of 20-mesh sieve is less than or equal to 1.0 percent.
3. The method for preparing iron-containing sludge pellets according to claim 1, wherein the method comprises the following steps: in the step A), the alkalinity of the chemical components of the iron-containing dust mud raw material is characterized by R ═ (Cao% + MgO%)/(SiO)2％+Al2O3Not less than 0.88% by weight, and CaO%>MgO％，SiO2％>Al2O3％。
4. The method for preparing iron-containing sludge pellets according to claim 1, wherein the method comprises the following steps: in the step A), the high-iron dust and mud raw material is obtained by drying one or more of iron dust and iron mud collected in a steel rolling procedure, and the chemical composition of the raw material is as follows: TFe is more than or equal to 68.0 percent and less than or equal to 73.0 percent, CaO is less than or equal to 2.0 percent, MgO is less than or equal to 1.0 percent, and SiO2≤1.5％，Al2O3≤1.0％，MnO≤0.5％，K2O≤1.0％，Na2O≤1.0％，S≤0.2％，P2O5≤0.2％，CaF2Not more than 0.2 percent, not more than 0.2 percent of Zn, not more than 0.5 percent of C, not more than 1.0 percent of water, and the balance of O, H, N elements combined with elements such as Fe, Zn, S, C and the like and inevitable small amount of other impurity elements, wherein the high-iron dust and mud raw material has the granularity characteristics that: the residue of 100-mesh sieve is less than or equal to 10.0 percent, and the residue of 20-mesh sieve is less than or equal to 1.0 percent.
5. The method for preparing iron-containing sludge pellets according to claim 1, wherein the method comprises the following steps: in the step B), the carbon raw material is obtained by grinding and drying coke powder and dry quenching dust removal powder, and the carbon raw material comprises the following components: more than or equal to 93.0 percent of C, less than or equal to 0.5 percent of TFe, less than or equal to 2.0 percent of CaO, less than or equal to 0.5 percent of MgO, and less than or equal to SiO2≤2.0％，Al2O3≤1.0％，MnO≤0.2％，K2O≤0.5％，Na2O≤0.5％，S≤0.2％，P2O5≤0.2％，CaF2Not more than 0.2 percent, not more than 0.2 percent of Zn, not more than 1.0 percent of water, and the balance of O, H, N element combined with Fe, Zn, S, C and other elements and inevitable small amount of other impurity elements, wherein the carbon raw material particlesThe degree is characterized in that: the residue of 200 mesh sieve is less than or equal to 20.0 percent, and the residue of 100 mesh sieve is less than or equal to 5.0 percent.
6. The method for preparing iron-containing sludge pellets according to claim 1, wherein the method comprises the following steps: in the step C), the quicklime powder is a raw material obtained by calcining, grinding and drying limestone, and the chemical components of the quicklime powder are that CaO is more than or equal to 90 percent, TFe is less than or equal to 1.0 percent, MgO is less than or equal to 5.0 percent, and SiO2≤2.0％，Al2O3≤1.0％，MnO≤0.5％，K2O≤1.0％，Na2O≤1.0％，S≤0.2％，P2O5≤0.2％，CaF2Not more than 0.2 percent, not more than 0.2 percent of Zn, not more than 0.5 percent of C, not more than 1.0 percent of water, and the balance of O, H, N elements combined with elements such as Fe, Zn, S, C and the like and inevitable small amount of other impurity elements, wherein the particle size of the quicklime powder is characterized in that: the residue of 200 mesh sieve is less than or equal to 20.0 percent, and the residue of 100 mesh sieve is less than or equal to 5.0 percent.
7. The method for preparing iron-containing sludge pellets according to claim 1, wherein the method comprises the following steps: in the step C), the optical alkalinity Lambda of the theoretical slag can be defined according to the metallurgy thermodynamics, and is calculated according to the components of the theoretical slag and the optical alkalinity of each substance, and the expression is
Wherein chi B is the total mole fraction of oxygen atoms in each component and is defined as chiB＝n(O)χ′B/∑n(O)χ′B，ΛBThe optical alkalinity of each component and the theoretical slag optical alkalinity lambda are the sum of the product of the mole fraction of each component and the optical alkalinity of each component.
8. The method for preparing iron-containing sludge pellets according to claim 1, wherein the method comprises the following steps: in the step D), the binder is one of medium-temperature asphalt, carboxymethyl cellulose and polyvinyl alcohol, and in the step E), the pellets are flat balls with the diameter of 5-8 cm.
9. The method for preparing iron-containing sludge pellets according to claim 1, wherein the method comprises the following steps: in the step B), the carbon raw material is added to obtain a mixture, wherein the TFe is more than or equal to 4.0 and less than or equal to 4.7.
10. The method for preparing iron-containing sludge pellets according to claim 1, wherein the method comprises the following steps: in the step C), 0.83 ≦ Λ ≦ 0.87 of the mixture obtained after the quicklime is added.
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| CN115125359A (en) * | 2021-03-29 | 2022-09-30 | 宝山钢铁股份有限公司 | Method and system for hot charging and hot returning of metallized pellets of rotary hearth furnace to converter for steelmaking |
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| CN114763581B (en) * | 2021-01-15 | 2023-12-12 | 宝山钢铁股份有限公司 | Solid waste pelletizing process and efficient sintering method thereof |
| CN115125359A (en) * | 2021-03-29 | 2022-09-30 | 宝山钢铁股份有限公司 | Method and system for hot charging and hot returning of metallized pellets of rotary hearth furnace to converter for steelmaking |
| CN115125359B (en) * | 2021-03-29 | 2024-01-09 | 宝山钢铁股份有限公司 | Method and system for steelmaking by hot charging and hot feeding of metallized pellets of rotary hearth furnace |
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