CN113416808B - Method for controlling zinc load of blast furnace - Google Patents
Method for controlling zinc load of blast furnace Download PDFInfo
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- CN113416808B CN113416808B CN202110611090.8A CN202110611090A CN113416808B CN 113416808 B CN113416808 B CN 113416808B CN 202110611090 A CN202110611090 A CN 202110611090A CN 113416808 B CN113416808 B CN 113416808B
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- 239000011701 zinc Substances 0.000 title claims abstract description 249
- 229910052725 zinc Inorganic materials 0.000 title claims abstract description 121
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 title claims abstract description 119
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000008188 pellet Substances 0.000 claims abstract description 55
- 239000000446 fuel Substances 0.000 claims abstract description 31
- 239000000463 material Substances 0.000 claims abstract description 17
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 86
- 229910052742 iron Inorganic materials 0.000 claims description 17
- 238000004519 manufacturing process Methods 0.000 abstract description 11
- 239000002910 solid waste Substances 0.000 abstract description 3
- 238000005245 sintering Methods 0.000 description 12
- 239000000571 coke Substances 0.000 description 7
- 238000003723 Smelting Methods 0.000 description 4
- 206010028980 Neoplasm Diseases 0.000 description 3
- 229910000805 Pig iron Inorganic materials 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 229910000859 α-Fe Inorganic materials 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 239000002956 ash Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000005453 pelletization Methods 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/001—Injecting additional fuel or reducing agents
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/008—Composition or distribution of the charge
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/02—Reliability analysis or reliability optimisation; Failure analysis, e.g. worst case scenario performance, failure mode and effects analysis [FMEA]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Computer Hardware Design (AREA)
- Evolutionary Computation (AREA)
- Geometry (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a method for controlling the zinc load of a blast furnace, which comprises the following steps: (1) determining the furnace inlet electrode of the blast furnace according to the level of the raw fuelLimited zinc load Zn(∝)(ii) a (2) Determining the charge material structure of the blast furnace and calculating the zinc load Zn in natural lump ore in the charge material structure(w)(ii) a (3) Calculating the blast furnace zinc load Zn brought by the fuel according to the theoretical comprehensive fuel ratio(R)(ii) a (4) Calculating the total Zn of the zinc load allowed to be carried into the sinter and the pellet by the blast furnace charge structure(Z)(ii) a (5) Determination of the maximum value of the zinc load Zn in sinter(S)Or maximum value Zn of zinc load in pellet ore(Q)(ii) a Determining the zinc load range of another material according to the furnace burden structure; (6) determining the zinc content of the sinter and the pellet under different proportions and grades according to requirements; (7) and under the condition of ensuring that the load of the zinc charged into the furnace is in a reasonable range, the production is carried out according to the requirements. The method effectively ensures the long-period stable smooth operation of the blast furnace and the reduction of the iron-making cost; not only ensures that the load of zinc entering the furnace does not exceed the standard, but also ensures the effective utilization of the zinc-containing solid waste.
Description
Technical Field
The invention relates to the technical field of smelting, in particular to a method for controlling the zinc load of a blast furnace.
Background
The zinc load of the blast furnace is the mass of zinc brought into the blast furnace by ton of iron in raw fuel. The harmful element zinc related in the blast furnace ironmaking process flow has negative effects on the normal operation of the blast furnace ironmaking process, the service life of equipment and the like, and the method is specifically shown in the following steps: the zinc charged into the furnace can improve the reactivity of the coke, reduce the thermal strength of the coke and directly influence the thermal performance of the coke; meanwhile, zinc can also influence the softening performance of furnace burden, promote the adhesion of furnace walls and influence the smooth operation of the blast furnace; furthermore, zinc can also damage the blast furnace lining, affecting the life of the blast furnace. The phenomena of abnormal stability of a blast furnace thermal system, abnormal stability of blast furnace gas flow, high blast furnace consumption, easy blockage of a gas sampling hole, easy blockage of a valve rod of a gas cut-off valve, high blast furnace nodule frequency and the like caused by overhigh zinc content in the fuel fed into the blast furnace are avoided. The above hazards directly affect the life, steady and high yield of the blast furnace, and iron-making workers are always controlling the charge of zinc based on the impact of zinc on blast furnace production.
Disclosure of Invention
The invention aims to provide a method for controlling the zinc load of a blast furnace with good effect.
In order to solve the technical problem, the method provided by the invention comprises the following steps: (1) determining the furnace-entering limit zinc load Zn of the blast furnace according to the level of the raw fuel(∝)；
(2) Determining charge material structure of blast furnaceAnd calculating the Zn load in the natural lump ore(w)；
(3) Calculating the blast furnace zinc load Zn brought by the fuel according to the theoretical comprehensive fuel ratio(R)；
(4) The total Zn of the zinc load allowed to be carried in by the sinter and the pellet is calculated by the blast furnace charge structure(Z)；
(5) Determination of the maximum value of the zinc load Zn in sinter(S)Or maximum value Zn of zinc load in pellet ore(Q)(ii) a Determining the zinc load range of another material according to the furnace burden structure;
(6) determining the zinc content of the sinter and the pellet under different proportions and grades according to requirements;
(7) under the condition of ensuring the load of the zinc charged in the furnace to be in a reasonable range, the production is carried out.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: after the furnace entering structure is determined, the reasonable range of the zinc and zinc contents in the sinter and the pellet can be determined in advance, sintering and pellet production are guided, and the furnace entering zinc load is ensured to be in the proper range; after the content of the zinc in the raw fuel entering the furnace is determined, the structure of the raw fuel entering the furnace can be adjusted, so that the load of the zinc entering the furnace is ensured to be in a proper range; the function of guiding production is achieved by adjusting the zinc load of the raw fuel entering the furnace or the structural mode of furnace charge before the production of the blast furnace. The invention can effectively control the zinc content of the fuel entering the furnace, thereby ensuring the smooth operation of the blast furnace and avoiding the damage of the inner lining of the blast furnace, thereby effectively prolonging the service life of the blast furnace, ensuring the stable production in the smelting process, effectively improving the smelting capacity and reducing the production cost; the method not only ensures that the load of the zinc entering the furnace does not exceed the standard, but also ensures the effective utilization of the zinc-containing solid waste.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments.
The method for controlling the zinc load of the blast furnace comprises the following process steps: (1) determining the furnace-entering limit zinc load Zn of the blast furnace according to the level of the raw fuel(∝)。
(2) Determining the charge material structure of the blast furnace, wherein the charge material structure comprises natural iron-rich lump ore, sintered ore and pelletsOre, using coke and injection fuel as fuel; calculating the Zn load of the natural lump ore by using the following formula (I)(w)；
Zn(w)＝ω1(Zn)*106/(ω1(Fe)*0.99/0.945) (Ⅰ)；
In the formula:
ω1(Zn): the mass percentage of Zn in the natural lump ore is percent;
ω1(Fe): iron grade,%, of natural lump ore;
Zn(w): zinc-loaded Zn in natural lump ore(w)，g/t。
106: converting ton into gram;
0.99: the yield of the ferrite in blast furnace ironmaking is high;
0.945: the iron content in pig iron in blast furnace iron making.
(3) Calculating the blast furnace zinc load Zn brought by the fuel according to the theoretical comprehensive coke ratio(R)(ii) a The following formula (II) is used to calculate the zinc load Zn of the blast furnace introduced by the fuel(R)；
Zn(R)＝k*1000*A*ω2(Zn) (Ⅱ)；
In the formula:
k: the comprehensive coke ratio, namely the total amount of fuel consumed by smelting one ton of pig iron is converted into the sum of dry coke amount, kg/t;
a: ash content,%, in the fuel;
ω2(Zn): mass percent of Zn in the ash of the fuel,%;
Zn(R): blast furnace zinc load, g/t, carried over by the fuel.
(4) Calculating the total Zn of the zinc load allowed to be carried into the sinter and the pellet by the blast furnace charge structure(Z)(ii) a The total amount of Zn allowed to carry over the zinc charge was calculated using the following formula (III)(Z)；
Zn(Z)＝Zn(∝)-Zn(w)*X-Zn(R) (Ⅲ)；
In the formula:
Zn(∝): zinc load in natural lump ore, g/t;
Zn(w): zinc-loaded Zn in natural lump ore(w)，g/t；
X: mass ratio of natural lump ore in a furnace burden structure is percent;
Zn(R): blast furnace zinc load carried in by fuel, g/t;
Zn(Z): the sinter and pellet were allowed to carry the total zinc load in g/t.
(5) Determination of the maximum value of the zinc load Zn in sinter(S)Or maximum value Zn of zinc load in pellet ore(Q)(ii) a Determining the zinc load range of another material according to the furnace burden structure; calculating the zinc load range of another material by adopting the following formula (IV);
Zn(S)*α+(1-X-α)*Zn(Q)≤Zn(Z) (Ⅳ)；
in the formula:
Zn(S): the maximum zinc load in the sinter, g/t;
Zn(Q): maximum zinc load in the pellet, g/t;
Zn(Z): the total zinc load, g/t, is allowed to be carried in by the sintered ore and the pellet ore;
α: the mass percentage of the sinter in the furnace burden structure is percent;
x: the mass ratio of the natural lump ore in the furnace charge structure is percent.
(6) Determining the zinc content of the sinter and the pellet under different proportions and grades according to requirements; determining the relation between the zinc content of the sinter and the pellet and the grade of the pellet under different proportions and grades by adopting the following formulas (V) and (VI);
ω3(Zn)*106/(ω3(Fe)*0.99/0.945)≤Zn(Q) (Ⅴ)；
ω4(Zn)*106/(ω4(Fe)*0.99/0.945)≤Zn(S) (Ⅵ)；
in the formula:
ω3(Zn): the mass percentage of Zn in the pellet ore is percent;
ω3(Fe): iron grade,%, of the pellets;
ω4(Zn): the mass percentage of Zn in the sinter is percent;
ω4(Fe): iron grade,%, of the sinter;
Zn(Q): maximum zinc load in the pellet, g/t;
Zn(S): the maximum zinc load in the sinter, g/t;
0.99: the yield of the ferrite in blast furnace ironmaking is high;
0.945: the content of the ferrite in the blast furnace iron-making pig iron.
(7) Under the condition of ensuring the load of the zinc charged into the furnace to be in a reasonable range, the production is carried out according to the requirements: firstly, determining the proper charging grade T of the blast furnace according to the profitability of the company products(Fe)Determining the blast furnace burden structure and determining the grade omega 3 of the pellet according to the supply condition of the company materials(Fe)Or agglomerate grade omega 4(Fe)(ii) a And determining the grade of the sinter ore or the pellet ore according to the following formula (VII):
T(Fe)＝ω1(Fe)*X+ω3(Fe)*β+ω4(Fe)*α (Ⅶ)；
in the formula:
T(Fe): iron grade,%, of the burden structure;
ω1(Fe): grade,%, of natural lump ore;
ω3(Fe): iron grade,%, of the pellets;
ω4(Fe): iron grade,%, of sinter;
α: the mass percentage of the sinter in the furnace burden structure is percent;
beta: the mass percentage of the pellet ore in the furnace burden structure is percent;
x: the mass ratio of the natural lump ore in the furnace charge structure is percent.
Finally, the proportion of the sintered ore and the pellet is controlled by adjusting the sintering alkalinity central line; from pellet grade omega 3(Fe)Determining the zinc content omega 3 in the pellet according to the formulas (IV), (V) and (VI)(Zn)The control range of (1); from sinter grade omega 4(Fe)Determining the zinc content omega 4 in the pellet according to the formulas (IV), (V) and (VI)(Zn)The control range of (1).
The embodiment is as follows: the present method is used by a steel mill to control the zinc load of blast furnace fuel as follows.
(1) Determining the furnace-entering zinc load index to be controlled in Zn(∝)＝300g/t。
(2) The charging material structure is 10 wt% of south African ore, the ratio of A to sintered ore is more than or equal to 65 wt% and less than or equal to 68 wt%, and the ratio of B to pellet ore is more than or equal to 25 wt% and more than or equal to 22 wt%.
The load of the zinc charged into the furnace in the south Africa ore is calculated by the formula (I): zn(w)＝ω1(Zn)*106/(ω1(Fe)0.99/0.945) of which ω 1(Zn)＝0.002％、ω1(Fe)64.1%, substituting the above equation yields Zn(w)＝29.78g/t。
(3) The integrated fuel ratio k of the steel mill is 500kg/t, and is calculated by the formula (II): zn(R)＝k*1000*A*ω2(Zn)Wherein A is 12.5%, omega 2(Zn)0.071%, substituting the above formula to obtain Zn(R)＝39.94g/t。
(4) Total Zn load of blast furnace to allow sinter and pellet to carry in(Z)Calculated from formula (III): zn(Z)＝300-Zn(w)*10％-Zn(R)Carry Zn into(w)、Zn(R)Calculating to obtain Zn(Z)＝230.28g/t。
(5) Determination of Zn load in pellets(Q)Less than or equal to 470g/t, the zinc load Zn of the sinter(S)Zn-loaded in pellet ore(Q)The structure is shown in formula (IV): zn(S)*α+(0.9-α)*Zn(Q)Less than or equal to 230.28g/t, simplified Zn extraction(S)470-192.72/alpha, wherein alpha is more than or equal to 65 percent, thereby determining the specific sinter ratio alpha and the zinc load Zn in the sinter(S)Table 1 below simply lists several common relationships:
table 1: ratio alpha of sinter to Zn load in sinter(S)In relation to (2)
| α | 65％ | 68％ | 70％ | 72％ | 75％ |
| Zn(S)|(≤) | 174g/t | 187g/t | 195g/t | 202g/t | 213g/t |
(6) Determining that the zinc load in the pellet is not more than 470g/t through the step (5), and determining the zinc content omega 3 in the pellet through the formula (V)(Zn)With pellet grade omega 3(Fe)The relationship between: omega 3(Zn)*106/(ω3(Fe)*0.99/0.945)≤470g/t，ω3(Zn)/ω3(Fe)≤492*10-6Table 2 below lists specific numerical relationships.
Table 2: the zinc content in the pellet is omega 3(Zn)With pellet grade omega 3(Fe)The relationship between
| ω3(Fe)(％) | 62 | 63 | 64 |
| ω3(Zn)|≤(％) | 0.0305 | 0.0310 | 0.0315 |
The zinc content omega 4 in the sinter can be known from the formula (VI)(Zn)And grade omega 4 of sinter(Fe)The relationship between: omega 4(Zn)*106/(ω4(Fe)0.99/0.945), the maximum allowable zinc load content in sintering at the corresponding sintering ratio can be known in the step (5), so that the relationship between the zinc content and the grade in the sintered ore at the corresponding ratio can be determined, as shown in the following tables 3 to 7.
Table 3: the relation between the zinc content and grade in the sinter when the sintering proportion is 65%
Table 4: the relation between the zinc content and grade in the sinter when the sintering proportion is 68 percent
Table 5: relation between zinc content and grade in sinter ore when sintering proportion is 70%
Table 6: the relation between the zinc content and grade in the sinter when the sintering proportion is 72%
Table 7: the relation between the zinc content and grade in the sinter when the sintering proportion is 75%
(7) Guiding production: determining the proper charging grade T of the blast furnace according to the profitability of the company products(Fe)57.5 percent, the structure of the blast furnace burden is determined by the supply condition of the company materials to be 10 percent of south African ore, the proportion of alpha to alpha is more than or equal to 65 percent and less than or equal to 68 percent of sinter ore, and the proportion of beta to pellet ore is more than or equal to 25 percent and more than or equal to 22 percent; determining pellet grade omega 3(Fe)62-63 percent of the grade of the sinter ore, and determining the grade omega 4 of the sinter ore according to a formula (VII)(Fe)：T(Fe)＝ω1(Fe)*10％+ω3(Fe)*β+ω4(Fe)α, to obtain ω 4(Fe)54 to 55.5 percent. Finally, the proportion of the sintered ore and the pellet is controlled by adjusting the sintering alkalinity central line.
From pellet grade omega 3(Fe)62-63 percent of the zinc content omega 3 in the pellet(Zn)Should be controlled between 0.0305% to 0.031%.
The ratio of alpha to omega 4 is calculated from the sinter(Fe)And (4) determining the zinc content omega 4 in the sinter according to the calculation result in the step (6)(Zn)Can be controlled between 0.0094% and 0.0104%.
The method ensures that the load of the zinc entering the furnace does not exceed the standard and also ensures the effective utilization of the zinc-containing solid waste.
Case counting: before 1 month in 2021, a steel mill has no specific requirement on the load of zinc entering a furnace, various types of fly ash and steel-making sludge are not eaten in a planned way, and the generated fly ash and sludge are all added into sintering and pelletizing production, so that the stability and the service life of a blast furnace are greatly influenced. Taking a 1# blast furnace as an example, the 1# blast furnace is respectively shut down for spraying in 11 months in 2019 and 12 months in 2020, and company technical personnel determine that the life of the blast furnace is fatally influenced by harmful elements such as charging zinc load, alkali load and the like after the continuous shutdown accidents occur.
When the No. 1 blast furnace is shut down and repaired for two times, large-area accretions are formed on the furnace wall of the blast furnace, the accretion positions are mainly concentrated in high-temperature areas in the furnace body, the furnace accretions are all annular accretions, and the thickest part reaches more than 1 m. And after sampling and testing in 12 months in 2020, the zinc content in the furnace tumor reaches 49.6 percent, and the furnace tumor is judged to be the zinc material tumor.
After the repair in 11 months in 2019, the stability of the furnace condition of No. 1 is obviously improved, but the good scene time is not long, after 10 months in 2020, the stability of the blast furnace is poor, small sleeves are frequently burnt and leaked, even middle sleeve burning and leaking phenomena occur, the indexes of the blast furnace obviously slide down, the blast furnace frequently collapses and hangs at the later stage, the times of material collapse in one shift reach 3 times at most, the treatment of the furnace condition fails, and the blast furnace is forced to be stopped for the intermediate repair.
The company in 2021 requires to control the zinc load in the furnace to be 300g/t, and the zinc content in the sinter and the pellet is controlled according to the method in a plan, so that the blast furnace is stable and smooth at present, and each index reaches a new height. The following table 8 lists the 2020, 2021 year # blast furnace index from 2 months to 4 months, and the following table 9 lists the 2021 year # zinc load daily index from 2 months to 4 months.
Table 8: 2020. 1# blast furnace index from 2 months to 4 months in 2021
Table 9: daily indicator of zinc load from 2 months to 4 months in 2021
The comparison in Table 8 shows that the stability of the blast furnace is improved, and each index is well developed in 2021. As can be seen from Table 9, the zinc load in the furnace is controlled stably in 2021, but the zinc load index still exceeds the requirement of the specified upper limit value due to the comprehensive influence of sintering, pellet batching and company economic benefits, which is inevitable.
Claims (1)
1. A method for controlling the zinc load of a blast furnace is characterized by comprising the following steps: (1) determining the furnace-entering limit zinc load Zn of the blast furnace according to the level of the raw fuel(∝)；
(2) Determining the charge material structure of the blast furnace and calculating the zinc load Zn in natural lump ore in the charge material structure(w)；
Zn(w)=ω1(Zn)*106/(ω1(Fe)*0.99/0.945) （Ⅰ）；
In the formula:
ω1(Zn): the mass percentage of Zn in the natural lump ore is percent;
ω1(Fe): iron grade,%, of natural lump ore;
Zn(w): zinc-loaded Zn in natural lump ore(w)，g/t；
(3) Calculating the blast furnace zinc load Zn brought by the fuel according to the theoretical comprehensive fuel ratio(R)；
Zn(R)=k*1000*A*ω2(Zn) （Ⅱ）；
In the formula:
k: the comprehensive fuel ratio is kg/t;
a: mass percent of ash in the fuel;
ω2(Zn): mass percent of Zn in the ash of the fuel,%;
Zn(R): blast furnace zinc load carried in by fuel, g/t;
(4) calculating the total Zn of the zinc load allowed to be carried into the sinter and the pellet by the blast furnace charge structure(Z)；
Zn(Z)=Zn(∝)-Zn(w)*X-Zn(R) （Ⅲ）；
In the formula:
Zn(∝): the charging limit zinc load is g/t;
Zn(w): zinc-loaded Zn in natural lump ore(w)，g/t；
X: the mass percentage of natural lump ore in the furnace burden structure is percent;
Zn(R): blast furnace zinc load carried in by fuel, g/t;
Zn(Z): the total zinc load, g/t, is allowed to be carried in by the sintered ore and the pellet ore;
(5) determination of the maximum value of the zinc load Zn in sinter(S)Or maximum value Zn of zinc load in pellet ore(Q)(ii) a Determining the zinc load range of another material according to the furnace burden structure;
Zn(S)*A+(1-X-α)*Zn(Q)≤Zn(Z) （Ⅳ）；
in the formula:
Zn(S): the maximum zinc load in the sinter, g/t;
Zn(Q): maximum zinc load in the pellet, g/t;
Zn(Z): the total zinc load, g/t, is allowed to be carried in by the sintered ore and the pellet ore;
α: the mass percentage of the sinter in the furnace burden structure is percent;
x: the mass percentage of natural lump ore in the furnace burden structure is percent;
(6) determining the zinc content of the sinter and the pellet under different proportions and grades according to requirements;
ω3(Zn)*106/(ω3(Fe)*0.99/0.945)≤Zn(Q) （Ⅴ）；
ω4(Zn)*106/(ω4(Fe)*0.99/0.945)≤Zn(S) （Ⅵ）；
in the formula:
ω3(Zn): the mass percentage of Zn in the pellet ore is percent;
ω3(Fe): iron grade,%, of the pellets;
ω4(Zn): the mass percentage of Zn in the sinter is percent;
ω4(Fe): iron grade,%, of sinter;
Zn(Q): the maximum zinc load in the pellet is g/t;
Zn(S): the maximum zinc load in the sinter, g/t;
(7) determining the grade of sinter ore or pellet ore by adopting the following formula (VII), and producing according to requirements under the condition of ensuring the load of zinc entering a furnace to be in a reasonable range;
T(Fe)=ω1(Fe)*X+ω3(Fe)*β+ω4(Fe)*α （Ⅶ）；
in the formula:
T(Fe): iron grade,%, of the burden structure;
ω1(Fe): iron grade,%, of natural lump ore;
ω3(Fe): iron grade,%, of the pellets;
ω4(Fe): iron grade,%, of the sinter;
α: the mass percentage of the sinter in the furnace burden structure is percent;
beta: the mass percentage of the pellet ore in the furnace burden structure is percent;
x: the mass ratio of the natural lump ore in the furnace charge structure is percent.
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Application publication date: 20210921 Assignee: Hebei Rongxin iron and Steel Co.,Ltd. Assignor: Hebei Xinda Iron and Steel Group Co.,Ltd. Contract record no.: X2024980010922 Denomination of invention: A method for controlling the zinc load of blast furnace Granted publication date: 20220705 License type: Common License Record date: 20240730 |