CN113943859A - Method for preparing sintered ore by utilizing high-density hematite powder - Google Patents
Method for preparing sintered ore by utilizing high-density hematite powder Download PDFInfo
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- CN113943859A CN113943859A CN202111132870.0A CN202111132870A CN113943859A CN 113943859 A CN113943859 A CN 113943859A CN 202111132870 A CN202111132870 A CN 202111132870A CN 113943859 A CN113943859 A CN 113943859A
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Abstract
The invention discloses a method for preparing sintered ore by utilizing high-density hematite powder, which comprises the following raw material ingredients in percentage by mass: 18 to 37 percent of high-density hematite powder, 40 to 50 percent of iron ore concentrate A, 10 to 18 percent of iron ore powder B, 10 to 15 percent of iron ore powder C, 5 to 7 percent of iron ore powder D, 3.5 to 8.5 percent of limestone, 0 to 4 percent of light-burned dolomite, 1.5 to 2.5 percent of serpentine, 3.0 to 4.5 percent of quicklime and 4.5 to 6.0 percent of coke powder; adding water into the raw materials, mixing and granulating to obtain a mixture; and distributing the mixture, igniting and sintering to obtain the sinter. According to the invention, the high-density hematite powder is mixed with other iron materials according to a certain proportion by using a ore blending technology, so that the quality index of the sinter can be effectively improved under the condition that the quality index of the sinter meets the blast furnace smelting requirement, and meanwhile, the sintering batching cost can be effectively reduced.
Description
Technical Field
The invention relates to the field of metallurgical sinter production, in particular to a method for preparing sinter by utilizing high-density hematite powder.
Background
Sinter is the most important iron-containing charge of blast furnaces. At present, the structure of the iron charge fed into the blast furnace is generally high-alkalinity sinter ore matched with acid pellet ore. In recent years, most iron and steel enterprises use a large amount of economic furnace burden to reduce the iron-making cost under the influence of the price fluctuation of steel materials, so that the sintering process and the sinter mineral quality index are difficult to control. For some enterprises, the iron ore resources are magnetic iron concentrates, so that the particle size composition is relatively fine. The permeability of the sinter bed is seriously deteriorated during the sintering process. In order to improve the air permeability of the sinter bed, a certain proportion of fine ore can be added into the iron material. The fine ore provided by the patent is characterized by compact structure, high bulk density, good granularity composition, high self-strength of iron ore, low content of harmful elements, lower content of crystal water and higher assimilation temperature. The high-density hematite can be used as a main frame ore of the sintering ore blending, but the ore has higher price and the cost for producing the sintering ore by using the ore is higher. The invention provides a scheme for producing sinter with high cost performance by using high-density hematite through ore blending.
Disclosure of Invention
The invention aims to provide a method for preparing sintered ore by using high-density hematite powder, which comprises the steps of mixing the high-density hematite powder with other iron materials according to a certain proportion by using a ore blending technology, and ensuring that the quality index of the sintered ore can be effectively improved and the cost of sintering ingredients can be effectively reduced under the condition that the index of the quality of the sintered ore meets the requirement of blast furnace smelting by adopting some technical means.
In order to solve the technical problems, the invention adopts the following technical scheme:
a method for preparing sinter from high-density hematite powder comprises the following raw materials in percentage by mass: 18 to 37 percent of high-density hematite powder, 40 to 50 percent of iron ore concentrate A, 10 to 18 percent of iron ore powder B, 10 to 15 percent of iron ore powder C, 5 to 7 percent of iron ore powder D, 3.5 to 8.5 percent of limestone, 0 to 4 percent of light-burned dolomite, 1.5 to 2.5 percent of serpentine, 3.0 to 4.5 percent of quicklime and 4.5 to 6.0 percent of coke powder; adding water into the raw materials, mixing and granulating to obtain a mixture; and distributing the mixture, igniting and sintering to obtain the sinter.
Further, the high dense hematite powder: TFe: 64.9-65.20%, and the main components comprise the following components in percentage by mass: FeO: 0.1-0.5%, CaO: 0.03% -0.25%, SiO 2: 4.3% -4.6%, MgO: 0.04-0.06%, Ig: 0.7 to 0.8 percent.
Further, the iron ore concentrate A: TFe: 64.5-66.5 percent, and the main components comprise the following components in percentage by mass: FeO: 27.5% -31.0%, CaO: 0.75% -2.35%, SiO 2: 1.05-3.5%, MgO: 0.65% -1.05%, Na 2O: 0.05% -0.15%, F: 0.08-0.3%, S: 0.65% -0.95%, K2O: 0.05% -0.15%, Ig: 1.0-2.0 percent and the passing rate of a 200-mesh screen is 90-95 percent.
Further, the iron ore powder B: TFe: 59.5-62.5%, the main components by weight percentage are as follows: FeO: 0.40-0.85%, CaO: 0.10% -0.80%, SiO 2: 4.0% -5.5%, MgO: 0.05% -0.08%, P: 0-0.15%, S: 0.025% -0.120%, Ig: 4.5 to 6.0 percent.
Further, the iron ore powder C: TFe: 57.50-59.50%, the main components by weight percentage are: FeO: 0-0.1%, CaO: 0-0.1%, SiO 2: 4.5% -5.5%, MgO: 0.05% -0.08%, P: 0-0.10%, S: 0.020% -0.030%, Ig: 6.5 to 7.8 percent.
Further, iron ore powder D: TFe: 56-57.5 percent, and the main components comprise the following components in percentage by mass: FeO: 0.4-0.8%, CaO: 0.0% -0.1%, SiO 2: 6.0% -7.5%, MgO: 0.05% -0.08%, P: 0-0.05%, S: 0.025% -0.120%, Ig: 7.5 to 8.5 percent.
Furthermore, the alkalinity of the sintered ore is 1.95-2.05, and the mass percentage of MgO in the sintered ore is 1.90% -2.10%.
Further, the mass percentage of the water in the mixture is 7.0-9.0%.
Further, granulating the mixture, wherein the time of the granulating process is controlled to be 4-6 min;
distributing the granulated mixture;
igniting the mixture arranged on the sintering device, wherein the ignition time is controlled to be 1-3 min, and the ignition negative pressure is 4000-6000 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 beneficial technical effects that:
according to the invention, the high-density hematite powder is mixed with other iron materials according to a certain proportion by optimizing the ore blending technology, so that the high-density hematite powder can be effectively utilized to produce sinter under the condition of ensuring that the quality index of the sinter meets the blast furnace smelting requirement, the quality index of the sinter is obviously improved, and meanwhile, the sintering solid fuel consumption can be effectively reduced and the sintering ore blending cost can be reduced by adding the high-density hematite powder.
The use of high-density hematite for ore blending to produce sinter can reduce the cost of the sinter raw materials. The ore type is 15 yuan/ton lower than the standard ore type, and the cost of sintering raw materials can be reduced by 4500 ten thousand yuan/year.
The use of the high-density hematite for ore blending to produce sinter can improve the drum strength of the sinter by 2 percent, improve the utilization coefficient of a blast furnace and reduce the fuel ratio of the blast furnace. Has considerable economic and social benefits.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
Fig. 1 is a process flow diagram of the method of the present invention for preparing sintered ore using highly dense hematite powder.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The following description of the embodiments of the present invention is made with reference to the accompanying drawings 1:
in this example, the iron ore concentrate is randomly taken from 5 raw materials for trial production, and the 5 raw materials are:
high dense hematite powder: TFe: 64.9-65.20%, and the main components comprise the following components in percentage by mass: FeO: 0.1-0.5%, CaO: 0.03% -0.25%, SiO 2: 4.3% -4.6%, MgO: 0.04-0.06%, Ig: 0.7 to 0.8 percent.
Iron ore concentrate A: TFe: 64.5-66.5 percent, and the main components comprise the following components in percentage by mass: FeO: 27.5% -31.0%, CaO: 0.75% -2.35%, SiO 2: 1.05-3.5%, MgO: 0.65% -1.05%, Na 2O: 0.05% -0.15%, F: 0.08-0.3%, S: 0.65% -0.95%, K2O: 0.05% -0.15%, Ig: 1.0-2.0 percent and the passing rate of a 200-mesh screen is 90-95 percent.
Iron ore powder B: TFe: 59.5-62.5%, the main components by weight percentage are as follows: FeO: 0.40-0.85%, CaO: 0.10% -0.80%, SiO 2: 4.0% -5.5%, MgO: 0.05% -0.08%, P: 0-0.15%, S: 0.025% -0.120%, Ig: 4.5 to 6.0 percent.
Iron ore powder C: TFe: 57.50-59.50%, the main components by weight percentage are: FeO: 0-0.1%, CaO: 0-0.1%, SiO 2: 4.5% -5.5%, MgO: 0.05% -0.08%, P: 0-0.10%, S: 0.020% -0.030%, Ig: 6.5 to 7.8 percent.
Iron ore powder D: TFe: 56-57.5 percent, and the main components comprise the following components in percentage by mass: FeO: 0.4-0.8%, CaO: 0.0% -0.1%, SiO 2: 6.0% -7.5%, MgO: 0.05% -0.08%, P: 0-0.05%, S: 0.025% -0.120%, Ig: 7.5 to 8.5 percent.
The raw materials and the mixture ratio shown in the table 1 and the table 2 are mixed. Adding water into the raw materials in a primary mixer, and uniformly mixing, wherein the water content is controlled to be 7.0%; then granulating in a secondary mixer for 3 min; the granulated mixture is uniformly distributed to a sintering device through a distributing device, the thickness of a material layer is 700mm, ignition is carried out through a sintering igniter, ignition fuel is natural gas, the ignition time is 2.0min, air exhaust is started at the bottom of the sintering device, certain negative pressure is formed under a grate, the ignition negative pressure is 5000Pa, air after ignition is pumped away from the sintering material layer from top to bottom, the sintering air exhaust negative pressure is 10000Pa, 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 fuel on the upper part. And when the combustion zone reaches the grate, the sintering process is ended to obtain the sinter.
Example (b):
the results of comparative analysis of the chemical composition of the sinter and the process index of the sinter under different limonite proportions in the sintered iron material are shown in table 3.
TABLE 1 chemical composition of raw fuel for sintering (wt%)
The chemical composition and process index of the sintered ore are shown in table 3.
TABLE 2 raw material ratio (wt%)
TABLE 3 chemical composition and Process index of sintered ore of examples
As can be seen from tables 2 and 3:
solid burnup aspect: compared with the reference example, the solid burnup tends to be reduced along with the increase of the proportion of the high-density hematite powder. In the aspect of drum strength: the drum strength is obviously increased along with the increase of the proportion of the high-density hematite powder. The example shows that the sintered ore produced by utilizing the high-density hematite has considerable economic benefit and social benefit.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (9)
1. A method for preparing sinter by using high-density hematite powder is characterized by comprising the following steps: the raw materials are mixed according to the following mass percentage: 18 to 37 percent of high-density hematite powder, 40 to 50 percent of iron ore concentrate A, 10 to 18 percent of iron ore powder B, 10 to 15 percent of iron ore powder C, 5 to 7 percent of iron ore powder D, 3.5 to 8.5 percent of limestone, 0 to 4 percent of light-burned dolomite, 1.5 to 2.5 percent of serpentine, 3.0 to 4.5 percent of quicklime and 4.5 to 6.0 percent of coke powder; adding water into the raw materials, mixing and granulating to obtain a mixture; and distributing the mixture, igniting and sintering to obtain the sinter.
2. The method of preparing sintered ore using highly dense hematite powder according to claim 1, wherein: the high dense hematite powder: TFe: 64.9-65.20%, and the main components comprise the following components in percentage by mass: FeO: 0.1-0.5%, CaO: 0.03% -0.25%, SiO 2: 4.3% -4.6%, MgO: 0.04-0.06%, Ig: 0.7 to 0.8 percent.
3. The method of preparing sintered ore using highly dense hematite powder according to claim 1, wherein: the iron ore concentrate A: TFe: 64.5-66.5 percent, and the main components comprise the following components in percentage by mass: FeO: 27.5% -31.0%, CaO: 0.75% -2.35%, SiO 2: 1.05-3.5%, MgO: 0.65% -1.05%, Na 2O: 0.05% -0.15%, F: 0.08-0.3%, S: 0.65% -0.95%, K2O: 0.05% -0.15%, Ig: 1.0-2.0 percent and the passing rate of a 200-mesh screen is 90-95 percent.
4. The method of preparing sintered ore using highly dense hematite powder according to claim 1, wherein: the iron ore powder B: TFe: 59.5-62.5%, the main components by weight percentage are as follows: FeO: 0.40-0.85%, CaO: 0.10% -0.80%, SiO 2: 4.0% -5.5%, MgO: 0.05% -0.08%, P: 0-0.15%, S: 0.025% -0.120%, Ig: 4.5 to 6.0 percent.
5. The method of preparing sintered ore using highly dense hematite powder according to claim 1, wherein: and the iron ore powder C: TFe: 57.50-59.50%, the main components by weight percentage are: FeO: 0-0.1%, CaO: 0-0.1%, SiO 2: 4.5% -5.5%, MgO: 0.05% -0.08%, P: 0-0.10%, S: 0.020% -0.030%, Ig: 6.5 to 7.8 percent.
6. The method of preparing sintered ore using highly dense hematite powder according to claim 1, wherein: iron ore powder D: TFe: 56-57.5 percent, and the main components comprise the following components in percentage by mass: FeO: 0.4-0.8%, CaO: 0.0% -0.1%, SiO 2: 6.0% -7.5%, MgO: 0.05% -0.08%, P: 0-0.05%, S: 0.025% -0.120%, Ig: 7.5 to 8.5 percent.
7. The method of preparing sintered ore using highly dense hematite powder according to claim 1, wherein: the alkalinity of the sintered ore is 1.95-2.05, and the mass percentage of MgO in the sintered ore is 1.90% -2.10%.
8. The method of preparing sintered ore using highly dense hematite powder according to claim 1, wherein: the mass percentage of the water in the mixture is 7.0-9.0%.
9. The method of preparing sintered ore using highly dense hematite powder according to claim 1, wherein:
granulating the mixture, wherein the time of the granulating process is controlled to be 4-6 min;
distributing the granulated mixture;
igniting the mixture arranged on the sintering device, wherein the ignition time is controlled to be 1-3 min, and the ignition negative pressure is 4000-6000 Pa;
the sintering process is accompanied with air draft treatment, and the negative pressure of the air draft is 9000-12000 Pa.
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| CN114622087A (en) * | 2022-02-07 | 2022-06-14 | 包头钢铁（集团）有限责任公司 | Method for preparing sintered ore by using iron ore concentrate with high alkali metal content |
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