CN111850198A - Iron-containing upgraded coal for blast furnace injection by taking fly ash as partial raw material and preparation method thereof - Google Patents
Iron-containing upgraded coal for blast furnace injection by taking fly ash as partial raw material and preparation method thereof Download PDFInfo
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- 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
- C21B5/003—Injection of pulverulent coal
- C21B5/004—Injection of slurries
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Abstract
The invention relates to iron-containing upgraded coal for blast furnace injection, which takes fly ash as a part of raw materials, and comprises the following components in percentage by weight: 65 to 90 percent of inferior coal powder; 5% -10% of dust; iron-containing concentrate powder 5-30%. And putting the inferior coal powder, the fly ash and the iron-containing concentrate powder into a heating furnace for roasting to obtain the iron-containing upgraded coal for blast furnace injection. The invention adopts low-cost low-grade coal powder stored in nature, dust produced by steel plants and iron-containing concentrate powder together, and carries out the external partial pre-reduction of iron-containing substances in the materials through a certain processing and manufacturing process, and adopts the existing blast furnace coal powder injection process to inject the iron-containing substances into the blast furnace for the daily production of the blast furnace.
Description
Technical Field
The invention relates to the technical field of iron making, in particular to iron-containing upgraded coal for blast furnace injection, which takes fly ash as a part of raw materials.
Background
For today's iron making processes, the economics of blast furnace smelting are still the highest, and the most widespread pig iron production forms exist. The blast furnace smelting economy is embodied by adopting other carbonaceous materials to replace part of coke for smelting in the furnace except for being used as a monomer container with the highest heat energy utilization efficiency, and the technology of coal dust injection is developed on the basis of the idea. Due to the limitation of resource quantity and manufacturing process, the coke price has a larger difference, so that after a large amount of pulverized coal is injected, the effect of obviously reducing the pig iron processing cost can be achieved, and the pulverized coal injection technology is adopted by blast furnaces with different effective furnace capacities in most enterprises today. After the pulverized coal is injected into the blast furnace, most of the pulverized coal is combusted in the tuyere raceway, and less of the pulverized coal enters the middle upper part of the blast furnace along with airflow and plays roles of a heating agent, a reducing agent and a carburizing agent in the blast furnace, so that the normal production of the blast furnace is maintained. For the coal powder injection process, for most enterprises, the coal powder injected into the furnace is mainly formed by mixing bituminous coal and anthracite, and for some enterprises, the cost, social resources and other factors are considered, and partial CDQ powder, semi coke and the like can be added into the coal powder, so that the cost of the mixed coal powder is reduced. Meanwhile, blast furnaces are the most popular iron-making production process, and the goals of blast furnaces are high efficiency and low consumption, and besides, high yield of pig iron. The most main product is pig iron, and the coal powder sprayed into the furnace has the great function of reacting with oxygen and the like to generate reducing gas of carbon monoxide, and iron oxide in the ore is reduced under certain temperature and atmosphere, so that qualified molten iron is obtained, and smelting production of the ore is completed. However, a problem arises here, due to the nature of the reduction process. If the partial reaction process in the furnace, such as partial reduction reaction, can be moved to other processes for carrying out, the advantage of doing so is that the operation efficiency of the furnace can be greatly improved, the fuel consumption is reduced, and therefore the stability, high yield and low consumption advocated by enterprises and society are realized.
Meanwhile, in the production process of metallurgical enterprises, especially in the current with strict environmental requirements, a large number of dust removal devices are installed at different parts of the process, and due to the process production characteristics, especially pre-iron processes such as sintering systems, pelletizing systems, coking systems, blast furnace systems and the like inevitably generate a large number of dust removal products, and the dust removal products are used as secondary products in the production process of steel plants, have a large number of varieties and complex components, have great difficulty in stacking and process treatment, and are also a serious burden for different enterprises. For the dust removal products, most steel plants do not have a good treatment method at present, and most enterprises adopt the dust removal products as iron-containing and carbon-containing materials which are mixed with other raw materials and then are fed back to sintering and pelletizing processes for agglomeration again. However, such a method realizes the reutilization of secondary products in steel plants, but the problems existing in the method are not negligible, namely the utilization efficiency of the products in the process is low, the excessive distribution also affects the quality of fired sintered ores and pellets, and the products are influenced by the production characteristics of the process, the alkali metals, zinc and other substances in the dust removal ash are continuously circulated in the process, the adverse effects are caused on the coke quality and the pipeline running state, brick linings in the furnace are corroded, the expansion and damage of lining bodies are caused, the long-life running of the blast furnace is seriously affected, and the problems are gradually increased along with the increasing of dust removal products in recent years.
The main components of the fly ash are carbon and iron, if the fly ash can be mixed with cheap coal powder and iron concentrate powder, the three can be combined, and part of the reaction is transferred to a secondary carbon-containing product for blast furnace smelting production through processing and manufacturing outside the furnace. Meanwhile, the process characteristic of coal dust injection also provides an operable technical means for the implementation of the technology. The characteristic that the blast furnace is a closed container can also be utilized, the secondary products are fully utilized, and the effects of killing two birds with one stone and achieving twice with half the effort are achieved.
Disclosure of Invention
The invention aims to solve the technical problem of providing the iron-containing upgraded coal for blast furnace injection, which takes the fly ash as part of raw materials, so that the fuel consumption of the blast furnace is reduced, the yield of the blast furnace is improved, the iron-making production cost is greatly reduced, and the green manufacturing of the blast furnace process is realized.
In order to achieve the purpose, the invention adopts the following technical scheme:
an iron-containing upgraded coal for blast furnace injection, which takes fly ash as a part of raw materials, comprises the following components in percentage by weight: 65 to 90 percent of inferior coal powder; 5% -10% of dust; iron-containing concentrate powder 5-30%.
The inferior coal powder is one or more of peat, lignite and bituminous coal.
The dedusting ash is one or more of blast furnace dry dedusting ash, blast furnace gravity dedusting ash, pellet dedusting ash, blast furnace coke groove dedusting ash, coking dedusting ash and pellet dedusting ash.
The TFe content of the iron-containing concentrate powder is more than or equal to 50 percent.
A method for preparing iron-containing upgraded coal for blast furnace injection by using fly ash as a part of raw materials comprises the steps of putting inferior coal powder, fly ash and iron-containing concentrate powder into a heating furnace for roasting, wherein the roasting temperature is 500-1100 ℃, and the roasting time is 2-10 hours.
The heating furnace is a retort furnace.
Compared with the prior art, the invention has the beneficial effects that:
the invention adopts low-cost low-grade coal powder stored in nature, dust produced by steel plants and iron-containing concentrate powder together, and carries out the external partial pre-reduction of iron-containing substances in the materials through a certain processing and manufacturing process, and adopts the existing blast furnace coal powder injection process to inject the iron-containing substances into the blast furnace for the daily production of the blast furnace.
Detailed Description
The invention is further illustrated by the following examples:
the following examples describe the invention in detail. These examples are merely illustrative of the best embodiments of the present invention and do not limit the scope of the invention.
Example 1 iron-containing upgraded coal blending scheme is shown in table 1.
Table 1:
| name of raw materials | Performance of | Mass proportion of% |
| Peat | Ash content, 25% | 20 |
| Brown coal | Ash content, 18% | 25 |
| Bituminous coal | Ash content, 10% | 25 |
| Blast furnace dry dedusting ash | 3 | |
| Blast furnace gravity dust-removing ash | 1 | |
| Pellet dedusting ash | 1 | |
| Vanadium-titanium concentrate powder | TFe content, 50%, Ti content, 7% | 25 |
The inferior cheap coal powder, the fly ash produced by an iron and steel plant and the vanadium-titanium-iron ore concentrate are mixed according to the proportion and then are put into a heating furnace, the roasting temperature is controlled at 650 ℃, and after 3 hours of roasting, the iron-containing upgraded coal for protecting the blast furnace can be prepared.
Example 1 the effect of blast furnace application is shown in table 2.
Table 2:
the existing blast furnace coal powder injection process is adopted, and the coal powder is injected into the blast furnace to carry out the daily production of the blast furnace, wherein the effective furnace volume is 450m3After the blast furnace is applied, the fuel consumption is reduced by 5kg/t, the daily pig iron yield is increased by 56 tons, the service life of the blast furnace is prolonged by 1 year, the fuel consumption of the blast furnace is reduced, the yield of the blast furnace is improved, simultaneously, the vanadium and titanium components are reasonably utilized to achieve a certain furnace protection effect of the blast furnace, the iron-making production cost can be greatly reduced, and the green manufacturing of the blast furnace process is realized.
Example 2 the formulation is shown in table 3.
Table 3:
| name of raw materials | Performance of | Mass proportion of% |
| Peat | Ash content, 25% | 15 |
| Brown coal | Ash content, 18% | 15 |
| Bituminous coal | Ash content, 10% | 40 |
| Coking fly ash | 3 | |
| Sintering dust removal ash | 3 | |
| Dust removal ash of blast furnace ore tank | 4 | |
| Vanadium-titanium-iron concentrate powder | TFe content, 55%, Ti content, 10% | 20 |
The inferior cheap coal powder, the dust removal ash produced by an iron and steel plant and the vanadium-titanium-iron ore concentrate are mixed according to the proportion and then are put into a heating furnace, the roasting temperature is controlled at 700 ℃, and after 4 hours of roasting, the iron-containing upgraded coal for protecting the blast furnace can be prepared.
Example 2 the effect of blast furnace application is shown in table 4.
Table 4:
the coal powder is sprayed into the blast furnace by adopting the existing blast furnace coal powder spraying process to carry out the daily production of the blast furnace, and the effective furnace volume is 1280m3After the blast furnace is applied, the fuel consumption is reduced by 3kg/t, the daily pig iron yield is increased by 80 tons, the service life of the blast furnace is prolonged by 1 year, the fuel consumption of the blast furnace is reduced, the yield of the blast furnace is improved, simultaneously, the vanadium and titanium components are reasonably utilized to achieve a certain blast furnace protection effect, the iron-making production cost can be greatly reduced, and the green manufacturing of a blast furnace process is realized.
Example 3 the formulation is shown in table 5.
Table 5:
| name of raw materials | Performance of | Mass proportion of% |
| Peat | Ash content, 25% | 30 |
| Brown coal | Ash content, 18% | 15 |
| Bituminous coal | Ash content, 10% | 40 |
| Dust removal ash of blast furnace coke groove | 3 | |
| Coking fly ash | 1 | |
| Pellet dedusting ash | 1 | |
| Vanadium-titanium-iron concentrate powder | TFe content, 60%, Ti content, 10% | 10 |
The inferior cheap coal powder, the dust removal ash produced by an iron and steel plant and the vanadium-titanium-iron ore concentrate are mixed according to the proportion and then are put into a heating furnace, the roasting temperature is controlled at 800 ℃, and after roasting for 5 hours, the iron-containing upgraded coal for protecting the blast furnace can be prepared.
Example 3 the effect of blast furnace application is shown in table 6.
Table 6:
the coal powder is sprayed into the blast furnace by adopting the existing blast furnace coal powder spraying process to carry out the daily production of the blast furnace, and the effective furnace volume is 2580m3After the blast furnace is applied, the fuel consumption is reduced by 4kg/t, the daily pig iron yield is increased by 100 tons, the service life of the blast furnace is prolonged by 2 years, and after the technology is implemented, the fuel consumption of the blast furnace can be reduced, the yield of the blast furnace is improved, simultaneously the vanadium and titanium components are reasonably utilized to achieve a certain blast furnace protection effect, the iron-making production cost can be greatly reduced, and the green manufacturing of the blast furnace process is realized.
Example 4 the formulation is shown in table 7.
Table 7:
| name of raw materials | Performance of | Mass proportion of% |
| Peat | Ash content, 25% | 45 |
| Brown coal | Ash content, 18% | 10 |
| Bituminous coal | Ash content, 10% | 24 |
| Blast furnace dry dedusting ash | 2 | |
| Blast furnace gravity ash | 2 | |
| Dust removal ash of blast furnace ore tank | 2 | |
| Vanadium-titanium iron-containing concentrate powder | TFe content, 60%, Ti content, 10% | 15 |
The inferior cheap coal powder, the dust removal ash produced by an iron and steel plant and the vanadium-titanium-iron ore concentrate are mixed according to the proportion and then are put into a heating furnace, the roasting temperature is controlled at 900 ℃, and after roasting for 4 hours, the iron-containing upgraded coal for protecting the blast furnace can be prepared.
Example 4 the effect of blast furnace application is shown in table 8.
Table 8:
the coal powder is sprayed into the blast furnace by adopting the existing blast furnace coal powder spraying process to carry out the daily production of the blast furnace, and the effective furnace volume is 3200m3After the blast furnace is applied, the fuel consumption is reduced by 5kg/t, the daily output of pig iron is increased by 120 tons, the service life of the blast furnace is prolonged by 2 years, the fuel consumption of the blast furnace can be reduced, the output of the blast furnace is improved, simultaneously, the vanadium and titanium components are reasonably utilized to achieve a certain blast furnace protection effect, and the smelting can be greatly reducedThe production cost of iron and the realization of the green manufacturing of the blast furnace process.
Example 5 is shown in Table 9.
Table 9:
| name of raw materials | Performance of | Mass proportion of% |
| Peat | Ash content, 25% | 15 |
| Brown coal | Ash content, 18% | 30 |
| Bituminous coal | Ash content, 10% | 35 |
| Dust removal ash of blast furnace ore tank | 1 | |
| Dust removal ash of blast furnace coke groove | 3 | |
| Coking fly ash | 1 | |
| Vanadium-titanium-iron concentrate powder | TFe content, 65%, Ti content, 15% | 15 |
The inferior cheap coal powder, the dust removal ash produced by an iron and steel plant and the vanadium-titanium-iron ore concentrate are mixed according to the proportion and then are put into a heating furnace, the roasting temperature is controlled at 900 ℃, and after roasting for 4 hours, the iron-containing upgraded coal for protecting the blast furnace can be prepared.
The effect of blast furnace application in example 5 is shown in Table 10.
Table 10:
the existing blast furnace coal powder injection process is adopted, and the coal powder is injected into the blast furnace to carry out the daily production of the blast furnace, and the effective furnace volume 4038m is3After the blast furnace is applied, the fuel consumption is reduced by 6kg/t, the daily pig iron yield is increased by 100 tons, the service life of the blast furnace is prolonged by 3 years, and after the technology is implemented, the fuel consumption of the blast furnace can be reduced, the yield of the blast furnace is improved, simultaneously the vanadium and titanium components are reasonably utilized to achieve a certain blast furnace protection effect, the iron-making production cost can be greatly reduced, and the green manufacturing of the blast furnace process is realized.
Example 6 the formulation is shown in table 11.
Table 11:
| name of raw materials | Performance of | Mass proportion of% |
| Peat | Ash content, 25% | 20 |
| Brown coal | Ash content, 18% | 25 |
| Bituminous coal | Ash content, 10% | 25 |
| Blast furnace dry dedusting ash | 2 | |
| Blast furnace gravity dust-removing ash | 2 | |
| Pellet dedusting ash | 1 | |
| Vanadium-titanium concentrate powder | TFe content, 50%, Ti content, 7% | 25 |
The inferior cheap coal powder, the fly ash produced by an iron and steel plant and the vanadium-titanium-iron ore concentrate are mixed according to the proportion and then are put into a heating furnace, the roasting temperature is controlled at 650 ℃, and after 3 hours of roasting, the iron-containing upgraded coal for protecting the blast furnace can be prepared.
Example 6 the effect of blast furnace application is shown in table 12.
Table 12:
the coal powder is sprayed into the blast furnace by the existing blast furnace coal powder spraying process to carry out the daily production of the blast furnace, and the effective furnace volume is 450m3After the blast furnace is applied, the fuel consumption is reduced by 5kg/t, the daily pig iron yield is increased by 56 tons, the service life of the blast furnace is prolonged by 1 year, and after the technology is implemented, the fuel consumption of the blast furnace can be reduced, the yield of the blast furnace is improved, simultaneously the vanadium and titanium components are reasonably utilized to achieve a certain blast furnace protection effect, the iron-making production cost can be greatly reduced, and the green manufacturing of the blast furnace process is realized.
The formulation scheme of example 7 is shown in Table 13.
Table 13:
| name of raw materials | Performance of | Mass proportion of% |
| Peat | Ash content, 25% | 15 |
| Brown coal | Ash content, 18% | 15 |
| Bituminous coal | Ash content, 10% | 45 |
| Coking fly ash | 2 | |
| Sintering dust removal ash | 1 | |
| Dust removal ash of blast furnace ore tank | 2 | |
| Vanadium-titanium-iron concentrate powder | TFe content, 55%, Ti content, 10% | 20 |
The inferior cheap coal powder, the dust removal ash produced by an iron and steel plant and the vanadium-titanium-iron ore concentrate are mixed according to the proportion and then are put into a heating furnace, the roasting temperature is controlled at 700 ℃, and after 4 hours of roasting, the iron-containing upgraded coal for protecting the blast furnace can be prepared.
Example 7 the effect of blast furnace application is shown in table 14.
TABLE 14
The coal powder is sprayed into the blast furnace by adopting the existing blast furnace coal powder spraying process to carry out the daily production of the blast furnace, and the effective furnace volume is 1280m3After the blast furnace is used, the fuel consumption is reduced by 3kg/t, the daily pig iron yield is increased by 80 tons, the service life of the blast furnace is prolonged by 1 year, after the technology is implemented, the fuel consumption of the blast furnace can be reduced, the yield of the blast furnace is improved, simultaneously, the vanadium and titanium components are reasonably utilized to achieve a certain furnace protection effect of the blast furnace, the iron-making production cost can be greatly reduced, and the green manufacturing of the blast furnace process is realized.
The formulation of example 8 is shown in Table 15.
Table 15:
| name of raw materials | Performance of | Mass proportion of% |
| Peat | Ash content, 25% | 30 |
| Brown coal | Ash content, 18% | 15 |
| Bituminous coal | Ash content, 10% | 40 |
| Dust removal ash of blast furnace coke groove | 3 | |
| Coking fly ash | 1 | |
| Pellet dedusting ash | 1 | |
| Vanadium-titanium-iron concentrate powder | TFe content, 60%, Ti content, 10% | 10 |
The inferior cheap coal powder, the dust removal ash produced by an iron and steel plant and the vanadium-titanium-iron ore concentrate are mixed according to the proportion and then are put into a heating furnace, the roasting temperature is controlled at 800 ℃, and after roasting for 5 hours, the iron-containing upgraded coal for protecting the blast furnace can be prepared.
Example 8 blast furnace application effects are shown in Table 16
Table 16:
the coal powder is sprayed into the blast furnace by adopting the existing blast furnace coal powder spraying process to carry out the daily production of the blast furnace, and the effective furnace volume is 2580m3After the blast furnace is applied, the fuel consumption is reduced by 4kg/t, the daily pig iron yield is increased by 100 tons, the service life of the blast furnace is prolonged by 2 years, and after the technology is implemented, the fuel consumption of the blast furnace can be reduced, the yield of the blast furnace is improved, simultaneously the vanadium and titanium components are reasonably utilized to achieve a certain blast furnace protection effect, the iron-making production cost can be greatly reduced, and the green manufacturing of the blast furnace process is realized.
The formulation of example 9 is shown in Table 17.
Table 17:
the inferior cheap coal powder, the dust removal ash produced by an iron and steel plant and the vanadium-titanium-iron ore concentrate are mixed according to the proportion and then are put into a heating furnace, the roasting temperature is controlled at 900 ℃, and after roasting for 4 hours, the iron-containing upgraded coal for protecting the blast furnace can be prepared.
Example 9 the effect of blast furnace application is shown in table 18.
Table 18:
the coal powder is sprayed into the blast furnace by adopting the existing blast furnace coal powder spraying process to carry out the daily production of the blast furnace, and the effective furnace volume is 3200m3After the blast furnace is applied, the fuel consumption is reduced by 5kg/t, the daily pig iron yield is increased by 120 tons, the service life of the blast furnace is prolonged by 2 years, and after the technology is implemented, the fuel consumption of the blast furnace can be reduced, the yield of the blast furnace is improved, simultaneously the vanadium and titanium components are reasonably utilized to achieve a certain blast furnace protection effect, the iron-making production cost can be greatly reduced, and the green manufacturing of the blast furnace process is realized.
The formulation of example 10 is shown in Table 19.
Table 19:
| name of raw materials | Performance of | Mass proportion of% |
| Peat | Ash content, 25% | 15 |
| Brown coal | Ash content, 18% | 30 |
| Bituminous coal | Ash content, 10% | 35 |
| Dust removal ash of blast furnace ore tank | 2 | |
| Dust removal ash of blast furnace coke groove | 1 | |
| Coking fly ash | 3 | |
| Vanadium-titanium-iron concentrate powder | TFe content, 65%, Ti content, 15% | 14 |
The inferior cheap coal powder, the dust removal ash produced by an iron and steel plant and the vanadium-titanium-iron ore concentrate are mixed according to the proportion and then are put into a heating furnace, the roasting temperature is controlled at 900 ℃, and after roasting for 4 hours, the iron-containing upgraded coal for protecting the blast furnace can be prepared.
The effect of blast furnace application of example 10 is shown in Table 20.
Table 20:
the existing blast furnace coal powder injection process is adopted, and the coal powder is injected into the blast furnace to carry out the daily production of the blast furnace, and the effective furnace volume 4038m is3After the blast furnace is applied, the fuel consumption is reduced by 6kg/t, the daily pig iron yield is increased by 100 tons, the service life of the blast furnace is prolonged by 3 years, and after the technology is implemented, the fuel consumption of the blast furnace can be reduced, the yield of the blast furnace is improved, simultaneously the vanadium and titanium components are reasonably utilized to achieve a certain blast furnace protection effect, the iron-making production cost can be greatly reduced, and the green manufacturing of the blast furnace process is realized.
Claims (6)
1. The iron-containing upgraded coal for blast furnace injection, which takes the fly ash as part of the raw material, is characterized by comprising the following components in percentage by weight: 65 to 90 percent of inferior coal powder; 5% -10% of dust; iron-containing concentrate powder 5-30%.
2. The upgraded coal containing iron for blast furnace injection using the fly ash as a part of raw material according to claim 1, wherein the low-grade pulverized coal is one or more of peat, lignite and bituminous coal.
3. The iron-containing upgraded coal for blast furnace injection using fly ash as a part of raw material according to claim 1, wherein the fly ash is one or more of blast furnace dry fly ash, blast furnace gravity fly ash, pellet fly ash, blast furnace coke oven fly ash, coking fly ash, and pellet fly ash.
4. The upgraded coal containing iron for blast furnace injection using fly ash as a part of raw material according to claim 1, wherein the TFe content of the iron-containing concentrate powder is not less than 50%.
5. The method for preparing the upgraded coal containing iron for blast furnace injection according to claim 1, wherein the upgraded coal containing iron is prepared by feeding low-grade coal powder, fly ash and iron-containing concentrate powder into a heating furnace for roasting at 500-1100 ℃ for 2-10 hours.
6. The method for preparing upgraded coal containing iron for blast furnace injection according to claim 5, wherein the furnace is a retort furnace.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103468841A (en) * | 2013-09-06 | 2013-12-25 | 鞍钢股份有限公司 | Semi coke injected by blast furnace and preparation method thereof |
| CN108660270A (en) * | 2017-03-29 | 2018-10-16 | 鞍钢股份有限公司 | A kind of low-temperature concretion coke and its production method of the blast furnace blowing containing metallic iron |
| CN109294654A (en) * | 2018-10-26 | 2019-02-01 | 本钢板材股份有限公司 | A kind of blast furnace blowing fuel and preparation method |
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- 2020-07-08 CN CN202010649522.XA patent/CN111850198A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103468841A (en) * | 2013-09-06 | 2013-12-25 | 鞍钢股份有限公司 | Semi coke injected by blast furnace and preparation method thereof |
| CN108660270A (en) * | 2017-03-29 | 2018-10-16 | 鞍钢股份有限公司 | A kind of low-temperature concretion coke and its production method of the blast furnace blowing containing metallic iron |
| CN109294654A (en) * | 2018-10-26 | 2019-02-01 | 本钢板材股份有限公司 | A kind of blast furnace blowing fuel and preparation method |
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Application publication date: 20201030 |