CN115786691A - Method for reducing sintering fuel consumption by utilizing carbon-containing dust removal ash and iron-containing dust mud - Google Patents

Method for reducing sintering fuel consumption by utilizing carbon-containing dust removal ash and iron-containing dust mud Download PDF

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CN115786691A
CN115786691A CN202211566735.1A CN202211566735A CN115786691A CN 115786691 A CN115786691 A CN 115786691A CN 202211566735 A CN202211566735 A CN 202211566735A CN 115786691 A CN115786691 A CN 115786691A
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iron
percent
sintering
iron ore
mass
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李玉柱
白晓光
赵长奕
张永
雷霆
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Baotou Iron and Steel Group Co Ltd
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Baotou Iron and Steel Group Co Ltd
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    • 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

Abstract

The invention discloses a method for reducing sintering fuel consumption by utilizing carbon-containing dedusting ash and iron-containing dust mud, which comprises the following raw materials in percentage by mass: 1 to 8 percent of carbon-containing dedusting ash, 25 to 45 percent of iron ore concentrate A, 8 to 25 percent of iron ore powder B of iron ore concentrate B, 0 to 18 percent of iron ore powder C, 15 to 40 percent of iron ore concentrate D, 4.0 to 8.0 percent of limestone, 2.0 to 7.0 percent of light-burned dolomite, 1.0 to 3.5 percent of quicklime, 2.0 to 7.0 percent of coke breeze and 8.0 to 13.0 percent of return fines; adding water into the raw materials, mixing the raw materials for the first time, adding 2-12% of iron-containing dust mud pellets, mixing for the second time, and granulating to obtain a sintering mixture; and sintering the sintering mixture to obtain the sinter. The pellets prepared by the invention can realize the recycling of carbon-containing dust and iron-containing dust and mud, and reduce the consumption of sintering solid fuel, thereby reducing the fuel cost and the carbon dioxide emission in the sintering process.

Description

Method for reducing sintering fuel consumption by using carbon-containing dust removal ash and iron-containing dust mud
Technical Field
The invention relates to a method for reducing sintering fuel consumption by utilizing carbon-containing dust and iron-containing dust.
Background
A large amount of dust and iron-containing dust can be generated in the iron-making and steel-making production processes in the iron and steel industry, the main recycling mode is to add in the sintering process, the carbon-containing dust contains iron and carbon, the carbon-containing dust can be directly added in the sintering ingredients, and the comprehensive utilization of the iron and steel process can be realized.
Disclosure of Invention
The invention aims to provide a method for reducing sintering fuel consumption by utilizing carbon-containing fly ash and iron-containing dust mud, wherein the carbon-containing fly ash is directly added in a sintering process, the iron-containing dust mud is prepared into small balls through cold solidification and then is added in a secondary sintering mixer, the prepared small balls can obviously improve the air permeability of a sintering material layer and can offset the situation that the air permeability of the sintering material layer is deteriorated due to the direct addition of the carbon-containing fly ash, so that the recycling of the carbon-containing fly ash and the iron-containing dust mud is realized under the condition of ensuring that the quality index of sintered ore meets the smelting requirement of a blast furnace, the consumption of sintering solid fuel is reduced, and further, the fuel cost and the carbon dioxide emission of the sintering process are reduced.
In order to solve the technical problem, the invention adopts the following technical scheme:
the invention discloses a method for reducing sintering fuel consumption by utilizing carbon-containing dedusting ash and iron-containing dust mud, which comprises the following raw materials in percentage by mass: 1 to 8 percent of carbon-containing dedusting ash, 25 to 45 percent of iron ore concentrate A, 8 to 25 percent of iron ore powder B of iron ore concentrate B, 0 to 18 percent of iron ore powder C, 15 to 40 percent of iron ore concentrate D, 4.0 to 8.0 percent of limestone, 2.0 to 7.0 percent of light-burned dolomite, 1.0 to 3.5 percent of quicklime, 2.0 to 7.0 percent of coke breeze and 8.0 to 13.0 percent of return fines; adding water into the raw materials, mixing the raw materials for the first time, adding 2-12% of iron-containing dust mud pellets, mixing for the second time, and granulating to obtain a sintering mixture; and sintering the sintering mixture to obtain the sinter.
Further, the iron-containing dust and mud pellets are prepared by adding a cement binder into iron-containing dust and mud in a special proportioning bin, wherein the proportioning proportion is 4%, then adding water to pelletize pellets on a pelletizing disc with the diameter of 6m, controlling the moisture content of the pellets to be 12%, enabling the particle size of the pellets to be 3-12mm and accounting for more than 85%, transporting the pellets to a curing field through a belt, curing for 9 days, and finally enabling the compressive strength of the iron-containing dust and mud pellets to reach more than 50N/piece.
Further, the iron ore powder A, the iron ore powder B, the iron ore powder C and the iron ore concentrate D are iron materials, the iron ore powder A accounts for 30-40% of the iron materials by mass, the iron ore powder B accounts for 10-20% of the iron materials by mass, the iron ore powder C accounts for 5-16% of the iron materials by mass, and the iron ore concentrate D accounts for 20-38% of the iron materials by mass.
Further, the carbon-containing fly ash comprises the following components in percentage by mass: 30.0 to 40.0 percent of TFe, 12.5 to 18.0 percent of FeO, 2.5 to 4.5 percent of CaO, and S iO 2 5.5～8.5％、MgO 0.35～1.25％、C23.0～30.0％、F 0.05～0.25％、P 0.05～0.12％、S 0.35～0.80％。
Further, the iron-containing dust and mud comprises the following components in percentage by mass: TFe 50.0-55.0%, feO 14.0-18.0%, caO 7.5-10.5%, siO 2 2.5～4.0％、MgO 1.6～2.1％、F 0.20～0.40％、P 0.05～0.10％、S 0.25～0.55％。
Further, the iron ore powder A comprises the following components in percentage by mass: 60.20 to 65.50 percent of TFe, 25.0 to 29.5 percent of FeO, 2.0 to 2.8 percent of CaO, and SiO 2 0.8～1.6％、MgO 0.65～1.25％、F 0.08～0.15％、P 0～0.10％、S 0.50～1.00％。
Further, the iron ore powder B comprises the following components in percentage by mass: 55.3 to 63.5 percent of TFe, 0.1 to 1.0 percent of FeO, 0.1 to 0.7 percent of CaO, and SiO 2 4.8～6.5％、MgO 0.4～0.9％、F 0.02～0.15％、P 0.02～0.10％、S 0.03～0.09％。
Further, the iron ore powder C comprises the following components in percentage by mass: 58.3 to 64.5 percent of TFe, 10.0 to 15.0 percent of FeO, 0.5 to 1.2 percent of CaO, and SiO 2 8.5～12.0％、MgO 0.5～1.2％、F 0.03～0.15％、P 0.03～0.10％、S 0.02～0.15％。。
Further, the iron ore concentrate D comprises the following components in percentage by mass: TFe 63.5-68.5%, feO 25.0-30.5%, caO 0.8-1.4%, siO 2 2.5～4.0％、MgO 0.7～1.3％、F 0.3～0.6％、P 0.03～0.09％、S 0.4～0.8％。
Furthermore, the alkalinity of the sintered ore is 1.95-2.05, and the mass percentage content of MgO in the sintered ore is 1.9% -2.3%; the granulation time is 2-5 min; the mass percentage of the water in the mixture is 7-9%; the ignition time of the sintering is 1-3 min, and the ignition negative pressure is 3000-6000 Pa; the sintering process is accompanied with air draft treatment, and the negative pressure of the air draft is 9000-12000 Pa.
Compared with the prior art, the invention has the following beneficial technical effects:
the sintering process can effectively reduce the solid fuel consumption in the sintering process due to the addition of the carbon-containing dedusting ash, and simultaneously can offset the problem of poor yield and quality of sintering ores due to the poor air permeability of the carbon-containing dedusting ash.
The invention uses the carbon-containing dust removal ash and the iron-containing dust mud pellets to be simultaneously mixed with the sintering mixture, mutually utilizes the respective advantages, and can effectively reduce the consumption of sintering solid fuel under the condition of ensuring that the output and quality indexes of the sintering ore meet the requirement of blast furnace smelting, thereby reducing the fuel cost and the emission of carbon dioxide in the sintering process.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The method for reducing the consumption of sintering fuel by utilizing the carbon-containing dedusting ash and the iron-containing dust mud has the following specific flow:
step S1: the raw materials are mixed according to the following mass percentage:
1 to 8 percent of carbon-containing dedusting ash, 25 to 45 percent of iron ore concentrate A, 8 to 25 percent of iron ore powder B of iron ore concentrate B, 0 to 18 percent of iron ore powder C, 15 to 40 percent of iron ore concentrate D, 4.0 to 8.0 percent of limestone, 2.0 to 7.0 percent of light-burned dolomite, 1.0 to 3.5 percent of quicklime, 2.0 to 7.0 percent of coke breeze and 8.0 to 13.0 percent of blast furnace return mine;
the iron ore powder A, the iron ore powder B, the iron ore powder C and the iron ore concentrate D are iron materials, the iron ore powder A accounts for 30-40% of the iron materials by mass, the iron ore powder B accounts for 10-20% of the iron materials by mass, the iron ore powder C accounts for 5-16% of the iron materials by mass, and the iron ore concentrate D accounts for 20-38% of the iron materials by mass.
The carbon-containing dedusting ash comprises the following components in percentage by mass: 30.0 to 40.0 percent of TFe, 12.5 to 18.0 percent of FeO, 2.5 to 4.5 percent of CaO, and S iO 2 5.5～8.5％、MgO 0.35～1.25％、C23.0～30.0％、F0.05～0.25％、P 0.05～0.12％、S 0.35～0.80％。
The iron ore powder A comprises the following components in percentage by mass: 60.20 to 65.50 percent of TFe, 25.0 to 29.5 percent of FeO, 2.0 to 2.8 percent of CaO, and SiO 2 0.8～1.6％、MgO 0.65～1.25％、F 0.08～0.15％、P 0～0.10％、S 0.50～1.00％。
The iron ore powder B comprises the following components in percentage by mass: 55.3 to 63.5 percent of TFe, 0.1 to 1.0 percent of FeO, 0.1 to 0.7 percent of CaO, and S iO 2 4.8～6.5％、MgO 0.4～0.9％、F 0.02～0.15％、P 0.02～0.10％、S 0.03～0.09％。
The iron ore powder C comprises the following components in percentage by mass: 58.3 to 64.5 percent of TFe, 10.0 to 15.0 percent of FeO, 0.5 to 1.2 percent of CaO, and SiO 2 8.5～12.0％、MgO 0.5～1.2％、F 0.03～0.15％、P0.03～0.10％、S 0.02～0.15％。
The iron ore concentrate D comprises the following components in percentage by mass: TFe 63.5-68.5%, feO 25.0-30.5%, caO 0.8-1.4%, siO 2 2.5～4.0％、MgO 0.7～1.3％、F 0.3～0.6％、P 0.03～0.09％、S 0.4～0.8％。
Step S2: adding a cement binder into the iron-containing dust mud in a special proportioning bin, wherein the proportion of the cement binder is 4%, then adding water to pelletize the iron-containing dust mud on a pelletizing disc with the diameter of 6m, controlling the moisture content of the pellets to be 12%, controlling the particle size of the pellets to be 3-12mm to account for more than 85%, transporting the pellets to a curing field through a belt, and curing for 9 days to finally obtain the iron-containing dust mud pellets with the compressive strength of more than 50N/pellet.
The iron-containing dust mud comprises the following components in percentage by mass: TFe 50.0-55.0%, feO 14.0-18.0%, caO 7.5-10.5%, siO 2 2.5～4.0％、MgO 1.6～2.1％、F 0.20～0.40％、P0.05～0.10％、S 0.25～0.55％。
And step S3: the raw materials are mixed by adding water, and then the mixture is mixed for the first time, and then the iron-containing dust mud pellets are added, and the mixture is subjected to secondary mixing and granulation to obtain a sintering mixture.
Specifically, the raw materials in the step S1 are added with water for primary mixing, and after uniform mixing, 2-12% of the iron-containing dust mud pellets obtained in the step S2 are added to obtain a mixture, and granulation is carried out for 2-5 min. The granulation process may be carried out in a granulator. Of course, the present application is not limited thereto, and may be implemented in other suitable devices.
And step S4: and sintering the sintering mixture to obtain the sinter.
Wherein the mass percentage of the water in the mixture is 7-9%. The ignition time of sintering is 1-3 min, and the ignition negative pressure is 8000-12000 Pa. The sintering process is accompanied with air draft treatment, and the negative pressure of the air draft is 9000-15000 Pa.
The sintering process may be performed on a sintering machine, although the present application is not limited thereto, and other suitable apparatuses may be used. The sintering process can be specifically carried out in the following manner:
the mixture is made to pass through a material distributor and to form a certain thickness on a sintering pallet, the mixture is ignited by a sintering machine head igniter, the ignition fuel is coke oven gas, the ignition time is 1-3 min, meanwhile, the bottom of the sintering machine starts to exhaust air, a certain negative pressure is formed below a grate, the ignition negative pressure is 8000-12000 Pa, the ignited air is pumped away from the top down through the sintering material layer, the sintering smoke is exhausted into the atmosphere after being subjected to a desulfurization process, the sintering exhaust negative pressure is 9000-15000 Pa, and the burning zone on the surface of the ignited material layer after ignition gradually moves towards the lower material layer along with the completion of the combustion of the upper fuel. And when the combustion zone reaches the grate, the sintering process is ended to obtain the sinter.
The alkalinity of the sintered ore is 1.95-2.05, and the mass percentage of MgO in the sintered ore is 1.9% -2.3%.
The process of the present invention is further illustrated by the following specific examples.
Specific components of each raw material used in the following examples are shown in table 1.
Chemical composition of raw Material used in Table 1 (wt%)
Figure SMS_1
Example 1
The raw materials and the mixture ratio shown in the table 2 are mixed. Uniformly mixing the raw materials in a primary mixing material, adding the iron-containing dust mud pellets, and granulating in a secondary mixing machine, wherein the granulation time is 3min, and the mass percentage of the water in the mixing material is controlled to be 7.5%. The granulated mixture passes through a material distributor and is uniformly distributed on a sintering machine trolley, the thickness of a material layer is 700mm, the mixture is ignited by an igniter of a sintering machine head, the ignition fuel is coke oven gas, the ignition time is 1.5 min, meanwhile, air draft is started at the bottom of the sintering machine, certain negative pressure is formed below a grate, the ignition negative pressure is 11000Pa, air after ignition is pumped away from the top down through the sintering material layer, sintering flue gas is exhausted into the atmosphere after a desulfurization process, the sintering air draft negative pressure is 13000Pa, and a combustion zone on the surface of the material layer after ignition gradually moves towards the lower material layer along with the combustion completion of the upper fuel. And when the combustion zone reaches the grate, the sintering process is ended to obtain the sinter.
The chemical composition and process index of the sintered ore are shown in table 3.
Example 2
The raw materials and the mixture ratio shown in the table 2 are mixed. Uniformly mixing the raw materials in the primary mixing material, adding the iron-containing dust mud pellets, and granulating in a secondary mixer for 4 min, wherein the mass percentage of the water in the mixing material is controlled to be 7.8%. The granulated mixture passes through a material distributor and is uniformly distributed on a sintering machine trolley, the thickness of a material layer is 700mm, the mixture is ignited by an igniter of a sintering machine head, the ignition fuel is coke oven gas, the ignition time is 2.0 min, meanwhile, air draft is started at the bottom of the sintering machine, certain negative pressure is formed below a grate, the ignition negative pressure is 11000Pa, air after ignition is pumped away from the top down through the sintering material layer, sintering flue gas is exhausted into the atmosphere after a desulfurization process, the sintering air draft negative pressure is 13000Pa, and a combustion zone on the surface of the material layer after ignition gradually moves towards the lower material layer along with the completion of combustion of upper fuel. And when the combustion zone reaches the grate, the sintering process is ended to obtain the sinter.
The chemical composition and process index of the sintered ore are shown in table 3.
TABLE 2 raw material ratio (wt%)
Figure SMS_2
TABLE 3 chemical composition and Process index of sintered ore of examples
Figure SMS_3
As can be seen from table 3, when the carbonaceous fly ash in an amount of 1.08% and 2.20% and the iron-containing sludge pellets in an amount of 2.89% and 5.88% were added to each of examples 1 and 2, respectively, the sintered ore chemical composition and the drum strength were not significantly changed, the utilization factor was slightly increased, and the sintered solid fuel consumption was significantly reduced, as compared to the reference point where the carbonaceous fly ash and the iron-containing sludge pellets were not added.
In summary, the invention provides a method for reducing sintering fuel consumption by utilizing carbon-containing dedusting ash and iron-containing dust mud, and the method is used for producing sintered ore by blending solid wastes such as carbon-containing dedusting ash and iron-containing dust mud pellets into sintering mixture, so that the quality of the sintered ore is improvedEffectively reduces the cost of sintering fuel and CO in the sintering process on the premise of meeting the smelting requirement of the blast furnace 2 And (5) discharging.
The above-described embodiments are only intended to illustrate the preferred embodiments of the present invention, and not to limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims (10)

1. A method for reducing the consumption of sintering fuel by utilizing carbon-containing dust removal ash and iron-containing dust sludge is characterized by comprising the following steps: the raw materials are mixed according to the following mass percentage: 1 to 8 percent of carbon-containing dedusting ash, 25 to 45 percent of iron ore concentrate A, 8 to 25 percent of iron ore powder B of iron ore concentrate B, 0 to 18 percent of iron ore powder C, 15 to 40 percent of iron ore concentrate D, 4.0 to 8.0 percent of limestone, 2.0 to 7.0 percent of light-burned dolomite, 1.0 to 3.5 percent of quicklime, 2.0 to 7.0 percent of coke breeze and 8.0 to 13.0 percent of return fines; adding water into the raw materials, mixing the raw materials for the first time, adding 2-12% of iron-containing dust mud pellets, mixing for the second time, and granulating to obtain a sintering mixture; and sintering the sintering mixture to obtain the sinter.
2. The method of reducing sintering fuel consumption utilizing carbonaceous dust and iron-containing sludge as claimed in claim 1 wherein: the iron-containing dust and mud pellets are prepared by adding a cement binder into iron-containing dust and mud in a special proportioning bin, wherein the proportion of proportioning is 4%, then adding water to pelletize pellets on a pelletizing disc with the diameter of 6m, the water content of the pellets is controlled to be 12%, the particle size of the pellets is 3-12mm and accounts for more than 85%, the pellets are transported to a curing field through a belt, the curing time is 9 days, and finally the compressive strength of the iron-containing dust and mud pellets reaches more than 50N/piece.
3. The method of reducing sintering fuel consumption utilizing carbonaceous dust and iron-containing sludge as claimed in claim 1 wherein: the iron ore powder A, the iron ore powder B, the iron ore powder C and the iron ore concentrate D are iron materials, the iron ore powder A accounts for 30-40% of the iron materials by mass, the iron ore powder B accounts for 10-20% of the iron materials by mass, the iron ore powder C accounts for 5-16% of the iron materials by mass, and the iron ore concentrate D accounts for 20-38% of the iron materials by mass.
4. The method of reducing sintering fuel consumption utilizing carbonaceous dust and iron-containing sludge as claimed in claim 1 wherein: the carbon-containing dedusting ash comprises the following components in percentage by mass: 30.0 to 40.0 percent of TFeS, 12.5 to 18.0 percent of FeO, 2.5 to 4.5 percent of CaO2, and SiO 2 5.5～8.5％、MgO0.35～1.25％、C23.0～30.0％、F0.05～0.25％、P0.05～0.12％、S0.35～0.80％。
5. The method of reducing sintering fuel consumption utilizing carbonaceous dust and iron-containing sludge as claimed in claim 1 wherein: the iron-containing dust mud comprises the following components in percentage by mass: TFe50.0-55.0%, feO 14.0-18.0%, caO7.5-10.5%, siO 2 2.5～4.0％、MgO1.6～2.1％、F0.20～0.40％、P0.05～0.10％、S0.25～0.55％。
6. The method of reducing sintering fuel consumption utilizing carbonaceous dust and iron-containing sludge according to claim 1 wherein: the iron ore powder A comprises the following components in percentage by mass: TFe60.20-65.50%, feO 25.0-29.5%, caO2.0-2.8%, siO 2 0.8～1.6％、MgO0.65～1.25％、F0.08～0.15％、P0～0.10％、S0.50～1.00％。
7. The method of reducing sintering fuel consumption utilizing carbonaceous dust and iron-containing sludge according to claim 1 wherein: the iron ore powder B comprises the following components in percentage by mass: TFe55.3-63.5%, feO 0.1-1.0%, caO0.1-0.7%, siO 2 4.8～6.5％、MgO0.4～0.9％、F0.02～0.15％、P0.02～0.10％、S0.03～0.09％。
8. The method of claim 1 using carbon-containing organic compoundsThe method for reducing the consumption of sintering fuel by using dust and iron-containing dust is characterized in that: the iron ore powder C comprises the following components in percentage by mass: TFe58.3-64.5%, feO 10.0-15.0%, caO0.5-1.2%, siO 2 8.5～12.0％、MgO0.5～1.2％、F0.03～0.15％、P0.03～0.10％、S0.02～0.15％。
9. The method of reducing sintering fuel consumption utilizing carbonaceous dust and iron-containing sludge as claimed in claim 1 wherein: the iron ore concentrate D comprises the following components in percentage by mass: TFe63.5-68.5%, feO 25.0-30.5%, caO0.8-1.4%, siO 2 2.5～4.0％、MgO0.7～1.3％、F0.3～0.6％、P0.03～0.09％、S0.4～0.8％。
10. The method of reducing sintering fuel consumption utilizing carbonaceous dust and iron-containing sludge as claimed in claim 1 wherein: the alkalinity of the sintered ore is 1.95 to 2.05, and the mass percentage of MgO in the sintered ore is 1.9 to 2.3 percent; the granulation time is 2-5 min; the mass percentage of the water in the mixture is 7-9%; the ignition time of the sintering is 1-3 min, and the ignition negative pressure is 3000-6000 Pa; the sintering process is accompanied with air draft treatment, and the negative pressure of the air draft is 9000-12000 Pa.
CN202211566735.1A 2022-12-07 2022-12-07 Method for reducing sintering fuel consumption by utilizing carbon-containing dust removal ash and iron-containing dust mud Pending CN115786691A (en)

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