CN111100983A - Low-carbon, environment-friendly and efficient sintering method for fractional addition of sintering fuel - Google Patents
Low-carbon, environment-friendly and efficient sintering method for fractional addition of sintering fuel Download PDFInfo
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- CN111100983A CN111100983A CN202010028719.1A CN202010028719A CN111100983A CN 111100983 A CN111100983 A CN 111100983A CN 202010028719 A CN202010028719 A CN 202010028719A CN 111100983 A CN111100983 A CN 111100983A
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- fuel
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
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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
- C21B5/008—Composition or distribution of the charge
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/26—Cooling of roasted, sintered, or agglomerated ores
Abstract
The invention discloses a low-carbon, environment-friendly and high-efficiency sintering method for adding sintered fuel in different grades, which comprises the steps of uniformly mixing ingredients, granulating, distributing, sintering, crushing, cooling and screening granules, and is characterized in that the fuel is divided into two parts, namely a fuel with a grade of >3mm and a fuel with a grade of <3mm before entering a bunker before uniformly mixing the ingredients, the fuel with the grade of <3mm is filled into the bunker in a sintered ingredient chamber, is uniformly mixed with other sintered materials and is moistened by adding water to obtain a material M1, and the fuel with the grade of >3mm is directly fed into a granulator in an external mixing mode to be mixed with the material M1 for granulating to obtain a mixture. The invention overcomes the problems of serious crushing and low utilization rate of fine grain fuel in the open-circuit crushing processing technique of the sintered anthracite, improves the utilization and production efficiency of the fuel, reduces the unit consumption of solid fuel and reduces the discharge amount of harmful gas.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a low-carbon, environment-friendly and high-efficiency sintering method for fractional addition of sintering fuel.
Background
In the iron and steel united enterprises, the sintering process is a raw material which is obtained by roasting iron-containing fine ores and concentrates at high temperature to obtain the material with physical and chemical properties suitable for blast furnace smelting, and is an indispensable process for long-flow iron and steel smelting at present. The crushing processing of the sintering fuel is an open-circuit flow, the grain size composition of the sintering fuel cannot be effectively controlled, the fuel is over-crushed, and the yield, the strength and the grain size composition of the sintering ore are adversely affected, so that the fuel consumption is higher, and the environmental protection pressure is increased.
The 200910136016.4 patent "a method for dispensing iron ore sintering fuel" discloses a method for dispensing iron ore sintering fuel, which comprises the following steps: mixing the material to be sintered and the fuel added for the first time in a primary mixer; mixing the materials after the primary mixing and the fuel added for the second time in a secondary mixer; adding the secondarily mixed materials into a sintering machine for sintering; wherein the fuel is a mixture of primary coke powder and secondary coke powder, or a mixture matching mode of primary anthracite and secondary coke powder, wherein the material to be sintered is as follows: by weight percentage, 40% -60% of vanadium-titanium magnetite concentrate, 1% -15% of imported fine ore, 1% -20% of common high-grade fine ore, 1% -10% of common medium-grade fine ore, 1% -15% of limestone and 1% -8% of quick lime, wherein the vanadium-titanium magnetite concentrate comprises the following components: 52% -55% of TFe, 23% -4% of SiO, 1.5% -2.0% of CaO, 2.0% -2.5% of MgO, 33.0% -4.5% of Al2O, V2O50.5% -0.6%, 213% -15% of TiO and 0.4% -0.6% of S, wherein Fe existing in the form of FeO is included in the TFe, and 29% -32% of FeO is included in the vanadium-titanium magnetite concentrate. The patent is to separate the fuel to be dosed into two portions, separately without treating the fuel particle size, with the second dose of fuel being between the primary and secondary mixers and immediately before the secondary mixer. The patent does not address fuel particle size and therefore it may occur that large particles of fuel become the core of the fine particle fuel, that over-segregation of fuel between different pellets occurs, and that the probability of large particles needing more oxygen to be consumed during combustion being present in an "isolated" state is reduced.
In summary, in order to solve the problems in the prior art, it is necessary to develop a low-carbon, environment-friendly and high-efficiency sintering method for fractional addition of sintering fuel.
Disclosure of Invention
The invention aims to provide a low-carbon, environment-friendly and high-efficiency sintering method for fractional addition of sintering fuel, which mainly solves the problems of serious crushing and low utilization rate of fine grain fuel in an open-circuit crushing processing technology of sintering anthracite.
In order to achieve the purpose, the invention adopts the following technical scheme:
a low-carbon, environment-friendly and high-efficiency sintering method for fractional addition of sintering fuel comprises the steps of uniformly mixing ingredients, granulating, distributing, sintering, crushing, cooling and screening, wherein the fuel is screened before uniformly mixing the ingredients, the fuel screening is to divide the fuel into a first fuel with a size of more than 3mm and a second fuel with a size of less than 3mm before entering a fuel bunker, the second fuel is filled into an original fuel bunker in a sintering ingredient chamber, the second fuel is uniformly mixed with materials such as iron ore, a fusing agent, return ores and the like, the materials are moistened by adding water to obtain a material M1, the first fuel is directly fed into a granulator through an external preparation mode to be mixed with the material M1 for granulating to obtain a mixture, and the water content of M1 is controlled to be 6-9%.
Preferably, the moisture content of the mixture is controlled to 6.5-10% during the granulation process.
Preferably, the first fuel and the second fuel are both anthracite.
Preferably, the sintering material comprises 1-84% of magnetite concentrate, 16-66% of imported fine ore, 1-30% of common low-grade fine ore and 8.1-20% of quicklime by weight percentage.
Preferably, the fuel is sieved and classified by a bar screen with a gap of 3 mm.
Preferably, the external blending means that the first fuel is conveyed to a newly added external blending fuel bin at the mixer through a newly added first external blending rubber belt conveyor, the first fuel is put on an external blending-2 rubber belt machine through a weighing device of a combination of a disc feeder and an electronic belt scale, then the first fuel is directly conveyed into the granulator through a second external blending rubber belt machine and is close to the granulator head, and the moisture of the mixture is controlled to be 7-9%.
Preferably, in the cloth sintering step, the negative pressure generated by the main sintering exhaust fan is-12.0 to-20.0 kpa.
Preferably, the ignition temperature in the cloth sintering step is in the range of 950-.
Preferably, in the crushing and cooling step, the sintered cake is crushed by a single-roller crusher and then is distributed on a circular cooler to be cooled by air blowing with air at 0-40 ℃, and the temperature of the cooled sintered ore is less than 200 ℃.
Preferably, the cooled sinter is sized and classified by a screening device, wherein
The part more than or equal to 5mm is qualified sinter ore for blast furnace smelting, and the part less than 5mm is internal return ore and returns to the batching chamber to participate in batching again.
The principle of the invention is as follows: the invention separates the thick part fuel and the thin part fuel, thereby changing the behavior of the fuel in the process of granulating the mixture, namely avoiding that the large-particle fuel becomes the core of the fine-particle fuel, generating the over segregation of the fuel among different pellets, increasing the probability that the large particles which need to consume more oxygen exist in an 'isolated' state in the combustion process, improving the contact condition with the air, improving the combustion speed, further improving the vertical sintering speed and the sintering production efficiency. Secondly, the coarse fuel and the fine fuel are separated, so that the fine fuel can be uniformly dispersed into the sintering material, the probability of serving as a mixed granulation core is increased, small mixture balls with proper particle size and formed by wrapping the mineral powder around the fine fuel are formed, the condition and the speed of air diffusion from outside to inside are improved and increased, the thermal state air permeability in the sintering process is improved, and the sintering productivity is improved; while reducing<The probability that the 1mm part is pumped away by high-speed air improves the fuel utilization rate, reduces the fuel consumption and reduces CO2、SO2And NOxThe amount of discharge of (c).
Compared with the prior art, the invention has the following beneficial effects:
1. the invention has simple sintering process, less change to the traditional sintering process and strong practicability;
2. the sintering process of the invention does not increase other costs;
3. under the same condition, compared with the traditional sintering method, the sintering method adopting fuel grading and adding has the advantages that the sintering capacity is improved by 36.89 percent, the unit consumption of the solid fuel of the sintering ore is reduced by 2.91kg/t, the unit price of the anthracite is 900 yuan/t, the unit consumption of each ton of the sintering ore is reduced by 2.62 yuan, the sintering ore is produced by 900 million tons every year, and the production cost is reduced by 2358.00 million yuan; in addition, the sintering method of the invention reduces CO2、SO2And NOxThe discharge amount of the air conditioner has social benefits of improving the air quality;
4. the invention can also improve the sintering technical index of the hard-to-burn ore species, and enlarge the range of ore usage, thereby reducing the production cost.
Drawings
FIG. 1 is a flow chart of fractional sintering of a sintering fuel according to the present invention.
Detailed Description
The present invention is further illustrated by the following examples, which are not intended to be limiting in any way, and any modifications or alterations based on the teachings of the present invention are intended to fall within the scope of the present invention.
The invention relates to a low-carbon, environment-friendly and high-efficiency sintering method for fractional addition of sintering fuel, which specifically comprises the following steps as shown in figure 1:
(1) screening: the fuel is supplied to a sintering proportioning chamber after a sintering fuel crushing procedure and is loaded into a fuel bunker
A sieving device with the aperture of 3 x 3mm is added before, and the fuel is graded, namely the fuel is divided into two parts of a first fuel with the diameter of >3mm and a second fuel with the diameter of <3 mm.
(2) Preparing materials: the second fuel is charged into the original fuel bunker in the sintering batching chamber, and mixed with the iron ore, the fusing agent,
Blending materials such as return ores and the like; the sintering material comprises 44% of magnetite concentrate, 36% of imported fine ore, 7% of common low-grade fine ore and 13% of quicklime by weight percentage.
(3) Blending operation: the first fuel matched in the sintering material mixing chamber is fed together with other materials required for sintering
And (3) in a blending machine, blending and adding water for wetting to obtain a material M1, wherein the moisture content of the material M1 is controlled to be 8.5%.
(4) External preparation: transporting the first fuel to the mixer through the newly added first externally-matched rubber belt conveyor
In the added external fuel blending bin, a weighing device combined by a disc feeder and an electronic belt scale is put down onto a second external adhesive tape machine, and then the second external adhesive tape machine is directly conveyed into a granulator.
(5) Granulating operation: the second fuel is added into the granulator and mixed with the material I after the blending operation
And performing mixture granulation operation in a granulator, and controlling the water content of the mixture to be 7.8%.
(6) And (3) ignition of the cloth: spreading the mixture on a sintering machine trolley by taking an ignition medium as 30-100 percent of blast furnace coal
The gas plus 0-70% coke oven gas is ignited on the surface of the mixture by flame after the combustion of the double-row igniter, and the ignition temperature is 1050 ℃.
(7) Air draft sintering: air is discharged from the sintering main exhaust fan under the action of negative pressure (-12.0) - (-20.0) kpa
And (3) pumping the mixture on the trolley into the surface, and performing high-voltage electrostatic dust removal and desulfurization and denitrification treatment on the mixture after passing through the whole material layer to discharge the mixture as standard waste gas.
(8) Crushing and cooling: crushing the sintered cake by a single-roller crusher, and then distributing the crushed cake on an annular cooler
And (3) carrying out blast cooling by using air at 25 ℃, wherein the temperature of the cooled sinter is less than 200 ℃.
(9) And (4) finishing and screening: the cooled sinter is subjected to size stabilization and screening classification by a screening device, wherein
The part more than or equal to 5mm is qualified sinter ore for blast furnace smelting, and the part less than 5mm is internal return ore and returns to the batching chamber to participate in batching again.
Example 1
The raw material ratios are carried out according to the ratios in table 1, and the sintering method for carrying out graded addition on the fuel provided by the invention is compared with the sintering effect of the traditional method under the same sintering condition, as shown in tables 2 and 3:
1. the formula of the sintering raw materials is shown in table 1:
table 1 sintering raw material ratio (%)
2. The sintered ore particle size composition is shown in table 2:
TABLE 2 sintered ore granulometric composition
As can be seen from Table 2, compared with the conventional sintering, the "fuel classification and addition" provided by the invention has the advantages that the change of the sintering return ore rate and the uniformity coefficient is not large, but the average particle size is reduced, mainly because the vertical sintering speed is increased by 31.18%, and the sintered ore is crushed under the condition of rapid cooling.
3. The sintering index is shown in table 3:
TABLE 3 sintering index
As can be seen from Table 3, compared with the conventional sintering method, the fuel grading and fractional addition sintering method of the invention has the advantages that the sintering time is shortened by 23.77% and the utilization coefficient is greatly improved by 36.89% on the premise that the comprehensive yield is slightly improved; the drum index is slightly reduced by 6.01 percent, which is related to the quenching of the sintering ore, measures such as material pressing, sinter bed increasing and the like can be taken in the sintering process, the quenching phenomenon is properly lightened to improve the strength of the sintering ore, the unit consumption of fuel is reduced by 2.91kg/t, and the unit price of anthracite coal is 900 yuan/t, and the unit price of each ton of sintering ore can be reduced by 2.62 yuan; 900 million tons of sintered ore are produced every year, and the production cost can be reduced by 2358.00 ten thousand yuan.
Example 2: the sintering test comparison of the Kulan powder single ore species is carried out by the fuel grading and adding method and the traditional method
The raw material ratios are carried out according to the ratios in table 4, and the sintering effect of the sintering method provided by the invention on the fuel is divided and added in a grading way and the sintering effect of the traditional method under the same sintering condition, for example, as shown in tables 5 and 6:
1. the formula of the sintering raw materials is shown in table 4:
TABLE 4 sintering raw material ratio (%)
2. The sinter grain size composition is shown in table 5:
TABLE 5 sinter grain size composition
As can be seen from table 5, the kuran powder monoore species adopt the traditional sintering method, and cannot obtain relevant experimental data because the sintering experimental process cannot be completely carried out; when the 'fuel grading and adding' sintering method is adopted, the grain size composition of the sintered ore is in a normal state.
3. The sintering index is shown in table 6:
TABLE 6 sintering index
As can be seen from table 6, the kuran powder single ore species adopt the traditional sintering method, the sintering time is prolonged, the sintering experiment process cannot be completely carried out, the vertical sintering speed and the end point temperature are too low, and other indexes cannot be obtained; when the fuel grading and adding sintering method provided by the invention is adopted, the sintering ore process is in a normal state, and the drum index and the end point temperature are in good levels, which shows that the method can also obviously improve the technical indexes of the difficult-to-sinter ore species, can expand the ore use range, and further reduce the production cost.
Claims (9)
1. A low-carbon, environment-friendly and high-efficiency sintering method for fractional addition of sintering fuel comprises the steps of uniformly mixing ingredients, granulating, distributing and sintering, crushing and cooling, and screening granules, and is characterized in that the fuel is screened before uniformly mixing the ingredients, and the fuel is divided into a first fuel with a grain size of more than 3mm and a second fuel with a grain size of less than 3mm before entering a fuel bunker;
loading the second fuel into an original fuel bunker in a sintering and proportioning chamber, uniformly mixing the second fuel with the sintering material in a uniformly mixing machine, and adding water for wetting to obtain a material M1;
directly feeding the first fuel into a granulator by an external preparation method to perform a mixture granulation operation with the material M1 to obtain a mixture.
2. The low-carbon, environment-friendly and efficient sintering method for fractional addition of sintering fuel as claimed in claim 1, wherein the fuel is sieved and graded through a bar screen with a gap of 3mm, and the moisture of the material M1 is controlled to be 6-9%.
3. The low-carbon, environment-friendly and high-efficiency sintering method for fractional addition of sintering fuel as claimed in claim 1, wherein in the granulating operation step, the moisture content of the mixture is controlled to be 6.5-10%.
4. The low-carbon, environment-friendly and high-efficiency sintering method by fractional addition of sintering fuel according to claim 1, wherein the first fuel and the second fuel are anthracite.
5. The low-carbon, environment-friendly and efficient sintering method for fractional addition of sintering fuel according to claim 1, characterized in that the external preparation is that the first fuel is transported to an external preparation fuel bin newly added at a mixer through a first external preparation belt conveyor newly added, is put down onto a second external preparation belt conveyor through a weighing device combining a disc feeder and an electronic belt scale, and is then directly fed into the granulator through the second external preparation belt conveyor.
6. The low-carbon, environment-friendly and high-efficiency sintering method for fractional addition of sintering fuel as claimed in claim 1, wherein the sintering material comprises 1-84% of magnetite concentrate, 16-66% of imported fine ore, 1-30% of common low-grade fine ore and 8.1-20% of quicklime by weight percentage.
7. The low-carbon, environment-friendly and efficient sintering method for fractional addition of sintering fuel as claimed in claim 1, wherein in the cloth sintering step, the negative pressure generated by the main sintering exhaust fan is-12.0 to-20.0 kpa, and the ignition temperature is 950-1250 ℃.
8. The low-carbon, environment-friendly and high-efficiency sintering method by adding fractional fractions of sintering fuels is characterized in that in the crushing and cooling step, air blowing cooling is carried out by using air at 0-40 ℃, and the temperature of the cooled sinter is less than 200 ℃.
9. The low-carbon, environment-friendly and efficient sintering method for fractional addition of sintering fuel according to claim 1, characterized in that after whole-grain screening, sinter of not less than 5mm is qualified sinter for blast furnace smelting, and sinter of <5mm is internal return ore and returns to a batching room to participate in batching again.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112378250A (en) * | 2020-11-12 | 2021-02-19 | 吴石金 | Three-dimensional material guide assembly adopting granular heating |
| CN114558779A (en) * | 2022-03-03 | 2022-05-31 | 广东韶钢松山股份有限公司 | Whole grain screening plant and whole grain screening system |
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| CN111100983B (en) | 2022-03-18 |
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