CN113416806A - Fusing agent for improving melting property of coal ash for blast furnace blowing and using method thereof - Google Patents
Fusing agent for improving melting property of coal ash for blast furnace blowing and using method thereof Download PDFInfo
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Abstract
The invention relates to a fusing agent for improving the melting property of coal ash for blast furnace blowing, which is prepared by respectively grinding and mixing steel slag powder, fly ash, quicklime and calcium-containing stones as raw materials; the raw material granularity and the mixing mass ratio are as follows: 20-70% of steel slag powder and the granularity of less than or equal to 8 mm; 10-40% of dust removal ash and less than or equal to 5mm in particle size; 5-20% of quicklime and the granularity is less than or equal to 5 mm; 10 to 40 percent of calcium-containing stones and the granularity of less than or equal to 6 mm. The invention utilizes the secondary product of the iron and steel plant to carry out the flux processing and manufacturing for improving the melting property of the coal for blowing at low cost, can obviously improve the melting property of the coal for blowing in the blast furnace, can realize the mass mixing of low-cost coal powder after the technical scheme is adopted and the flux is added, widens the range of the coal for blowing, thereby reducing the cost of mixing the coal powder and improving the economical efficiency of iron-making production.
Description
Technical Field
The invention relates to the technical field of iron making, in particular to a fusing agent for improving the melting performance of coal ash for blast furnace blowing and a using method thereof.
Background
As the most main production equipment for manufacturing the molten iron, the blast furnace has the advantages of high heat utilization efficiency, simple and convenient operation and maintenance and the like in the production process, so that the blast furnace has the advantages in various iron-making processes, and most of the molten iron used for processing steel products at present comes from the blast furnace iron-making process. Among them, the blast furnace iron-making process has the most outstanding advantages that the smelting process has the highest economical efficiency, and the lowest cost of pig iron processing and manufacturing can be realized, so that the purpose of maximizing the enterprise benefit can be achieved. The blast furnace ironmaking process is mainly economical in that the fuel consumption amount of the blast furnace ironmaking process is the minimum in the smelting process, namely, the consumed coal powder or coke is the minimum in the production process compared with other different smelting processes. In the daily operation process of the blast furnace, due to the fact that coke and coal powder have large price difference, coal powder resources are rich, available resources are more and are widely distributed, the coal powder injection process is rapidly developed in recent years due to the advantages, and the prominent expression is that the injected coal amount is continuously increased. Furthermore, with the continuous progress and development of society, a plurality of new technologies can be applied and implemented, such as an automatic control technology, dense phase transportation, medium speed milling powder preparation, mixed coal powder injection and the like in the coal powder injection process, and the new processes and new equipment are put into use, so that the status of the coal powder injection process in the production of the blast furnace is strengthened.
Meanwhile, with the continuous improvement of the blast furnace smelting strengthening level and the continuous progress of the auxiliary technology, the control indexes such as the air temperature, the oxygen-rich level, the air pressure and the like are further improved. Compared with the prior medium and small blast furnaces, the smelting environment in the furnace is worse than the prior furnace, such as the internal temperature level and the like. It should be noted here that most of the high-volatile bituminous coals for blast furnace injection have a significant characteristic, namely, due to the influences of factors such as geological conditions and years of coal formation, ash content of the bituminous coals contains higher acidic substances, the ash melting performance is lower due to the existence of excessive acidic substances, and after coal dust is injected into the blast furnace through a coal gun, the bituminous coals with higher volatile contents are rapidly combusted under the action of higher air temperature, so that the bituminous coals with higher volatile contents can be cooled at air ports and the like to generate slagging and coking phenomena, the service lives of the air ports and the like and the uniformity of air intake of the blast furnace can be influenced, and the production of the blast furnace can be adversely affected. Therefore, from the perspective of reasonable production in blast furnace ironmaking, it is desirable that the pulverized coal injected into the furnace by the blast furnace has high ash fusion characteristics, so as to avoid phenomena such as slagging and the like which are unfavorable for production. In order to solve the problems of unfavorable production phenomena in the modern blast furnace coal powder injection process, the following technical measures are mainly adopted, firstly, from the perspective of injected coal powder, under the conditions that the cost of injected coal powder is acceptable and resource conditions are met, some coal powder with high ash fusion performance such as anthracite is injected as far as possible, so that the ash fusion performance of mixed coal powder is improved, and the production phenomena are prevented from being influenced by tuyere slag bonding. The method is characterized in that a plurality of flux substances are added into mixed coal dust to improve the ash content of the mixed coal dust, so that the ash fusion performance is improved, the production problems of slag bonding, coking and the like are avoided, the acid-base ratio of the ash content of the coal dust is adjusted by adding high-melting-point oxides such as aluminum oxide, calcium oxide and the like in the flux, and the purpose of improving the ash fusion performance is further achieved. Moreover, other methods such as adjusting the structure and material of the coal lance and the tuyere are adopted to reduce the occurrence of the problems of slagging and the like, but the implementation of the technology also finds some problems, such as the fact that the structure of some blast furnaces is not allowed or the design of the equipment is not reasonable, the effect after installation is limited, and the slagging phenomenon at the tuyere and the like in the coal powder injection process cannot be fundamentally solved. In the technical method, in the long-term research process of the fusion performance of the coal ash of different raw coals and mixed coal dusts, the fusion performance of the mixed coal ash is considered to be the most practicable and the most economical and best scheme through the addition of the fusing agent and further artificial adjustment. On the basis, the actual conditions of a steel plant are fully combined, the high-melting substances are excavated and combined, and after long-time research and practice, the necessary flux product is manufactured, the melting performance of the blast furnace coal dust can be improved, and the process effect of the blast furnace coal dust injection process is optimized.
In daily iron-making production, coal powder injection is taken as a core process for reducing cost, the importance of the coal powder injection is self-evident, and the occurrence of unfavorable production phenomena such as slag bonding, coking and the like is required to be avoided in order to realize the normal production of the process for injecting the coal powder into the blast furnace, so that the coal powder meeting the melting property of the ash for the blast furnace is required to be injected, and the stable production of iron-making is realized. Aiming at a flux and a method for adjusting the melting point of coal ash, a scheme for optimizing the proportion of different coal types is developed to improve the ash melting property of mixed coal dust so as to avoid the influence of tuyere slagging and the like on production phenomena (see Chinese patent 'a coal blending method for injecting high-calcium low-ash-melting-point bituminous coal in a blast furnace and a blended coal thereof' patent application No. CN 110592299A; 'a preparation method for injecting coal in a blast furnace' patent application No. CN 104471078A; 'a blast furnace injected coal and a manufacturing method thereof' patent application No. CN 104487598A; 'a preparation method for injecting coal in a blast furnace, coal sprayed in a blast furnace and a utilization method thereof' CN106029911A and the like). However, the magnetic technique has the precedent disadvantages that the blending amount is limited, the implementation is difficult, and the method for increasing or decreasing the melting point of coal ash is realized by adding flux with different components (see Chinese patent 'flux for decreasing the melting point of coal ash and improving the viscosity-temperature characteristic and application thereof' patent application No. CN106520254A, 'flux for decreasing the melting point temperature of ash of gasified coal ash and application thereof' patent application No. CN104479794B, 'flux for decreasing the melting point of coal ash' patent application No. CN111534355A, 'method for increasing the melting temperature of coal ash by using aluminum oxide as an additive' patent application No. CN101921644B, 'composite blocking flux for increasing the melting temperature of low-ash-melting-point coal ash' patent application No. CN108018109A, 'high-efficiency composite flux for decreasing the melting point of coal ash and application No. CN 106520206B' and the like), the technical invention changes the ash fusion characteristic of coal ash by adjusting the raw coal ash components, improves or reduces the ash fusion point, can effectively reduce the coal ash fusion point and improve the viscosity-temperature characteristic of coal, further realizes industrial application, and achieves a certain effect. The method adopts optimized design and other modes to realize the improvement of process equipment so as to avoid the occurrence of unfavorable production phenomena (see Chinese patent 'optimization method of high-calcium bituminous coal for blast furnace injection based on ash fusion characteristics' patent application No. CN 110205420A; 'anti-slagging and anti-coking system and method of a boiler mixed with low ash fusion point coal' patent application No. CN 110041980A; 'method for reducing blast furnace tuyere and lance slagging' patent application No. CN111876534A and the like). the measures are adopted to reduce coking and slagging phenomena in the process of coal powder injection through the optimized design of coal guns, tuyeres and the like, and have certain feasibility but generally have limited effect in practical application. In addition, the method is a literature document which can be consulted at home and abroad (see journal ' Chinese Motor engineering journal ' prediction on influence of blending biology on coal ash melting point and mixed ash flow temperature ' 2012, 32, 11, 41-43; ' Zhejiang university journal ' application of generalized regression neural network in coal ash melting point prediction ' 2004, 38, 11, 1480; ' clean coal technology ' correlation analysis of coal ash components and ash melting property ' 2018, 24, 2, 74-76; ' research on influence of coal blending on melting property of high-melting coal ash ' 2016, 44, 12, 1430 and 1435 and the like), most of the documents record that ash components are closely related to melting property of coal ash, silica-alumina ratio and alkali metal content in coal ash influence melting temperature of coal ash, and obtain a very complex material, in the coal gasification process, many kinds of minerals determine the ash melting temperature together, but no clear suggestion or explanation can be given as to how to carry out the flux production at low cost.
Disclosure of Invention
The invention aims to solve the technical problem of providing a fusing agent for improving the melting property of coal ash for blast furnace injection, which can obviously improve the melting property of coal for blast furnace injection, realize the mass mixing of low-cost coal powder and widen the range of coal for injection, thereby reducing the cost of mixing the coal powder.
In order to achieve the purpose, the invention adopts the following technical scheme:
a flux for improving the melting property of coal ash for blast furnace blowing is prepared by taking steel slag powder, fly ash, quicklime and calcium-containing stones as raw materials, grinding respectively and mixing; the raw material granularity and the mixing mass ratio are as follows: 20-70% of steel slag powder and the granularity of less than or equal to 8 mm; 10-40% of dust removal ash and less than or equal to 5mm in particle size; 5-20% of quicklime and the granularity is less than or equal to 5 mm; 10 to 40 percent of calcium-containing stones and the granularity of less than or equal to 6 mm.
The steel slag powder is composed of one or more of converter steel slag powder, electric furnace steel slag powder and refining furnace steel slag powder.
The steel slag powder has a granularity less than or equal to 5mm and accounts for not less than 70% of the whole mass of the steel slag powder.
The fly ash is derived from a sintering workshop and has binary alkalinity not lower than 1.8.
The content of calcium oxide in the quicklime is not lower than 60 percent;
the calcium-containing stones are formed by one or more materials of limestone, calcite, dolomite and marble; wherein the content of calcium oxide in limestone is not less than 40%, the content of calcium oxide in calcite is not less than 40%, the content of calcium oxide in dolomite is not less than 30%, and the content of calcium oxide in marble is not less than 20%.
The mass proportion of the part with the granularity less than or equal to 5mm in the calcium-containing stones is not less than 50 percent.
The mixing time is 30-60 min.
A method for using fusing agent for improving the melting property of coal ash for blast furnace injection comprises the steps of continuously feeding the fusing agent to the upper part of coal powder of a coal transporting main belt in a coal injection process, milling the coal powder through a medium-speed mill, uniformly mixing the coal powder and the coal powder, fluidizing the mixture through an injection tank and conveying the mixture through a pipeline, and injecting the coal powder into a blast furnace tuyere convolution area through a coal gun; the proportion of the flux in the mixed pulverized coal is determined by adopting the following mathematical relationship:
the symbols in the formula:
p is the mass proportion of the flux in the mixed coal powder;
l is the ash content binary acid-base ratio in the mixed coal powder for injection,%;
k1as a function of the number of the coefficients,the value range is 0.030-0.034.
The control range of the ash content of the mixed coal powder is 7 to 18 percent.
The binary acid-base ratio of ash in the mixed coal dust is the numerical value of dividing the mass percentage of silicon dioxide in the ash of the coal dust by the mass percentage of calcium oxide.
The granularity of the powder prepared by the medium-speed mill is less than 200 meshes.
Compared with the prior art, the invention has the beneficial effects that:
the invention depends on the resource conditions of enterprises, and utilizes the secondary products of iron and steel plants to process and manufacture the flux which improves the melting property of the coal for injection at low cost, thereby realizing the significant improvement of the melting property of the coal for injection in 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 (mixing coal powder for injection in certain iron and steel works as an example)
A flux for improving the melting property of coal ash for blast furnace injection, the proportioning scheme is shown in Table 1.
Table 1: flux proportioning scheme
| Kind of material | Proportioning according to% | Particle size |
| Converter steel slag powder | 55 | ≤5mm |
| Dust removal ash | 5 | ≤3mm |
| Quick lime | 30 | ≤3mm |
| Limestone | 10 | ≤5mm |
The converter steel slag powder, the fly ash, the quicklime and the limestone are used as flux raw materials for improving the melting property of the coal ash for blowing the converter, the raw materials are respectively put into a grinding machine for grinding, the raw materials are put into a mixing machine according to the proportion, and the mixture is mixed for 30min to prepare the flux.
A method for using fusing agent for improving the melting property of coal ash for blast furnace blowing,
the proportion of the flux in the mixed pulverized coal is determined by adopting the following mathematical relationship:
the blending ratio of the flux in the mixed pulverized coal is shown in table 2.
Table 2: the proportion of the flux in the mixed pulverized coal is%
| Item | Numerical value |
| The bituminous coal is proportioned according to the proportion | 65.00 |
| Acid-base ratio of dust-removing ash mixed coal powder | 2.31 |
| The proportion of the flux in the mixed coal powder,& | 2.62 |
the flux is continuously added to the upper part of coal powder of a coal transporting main belt in a coal injection process according to the proportion of 2.62 percent, the coal powder is milled by a medium-speed mill, the granularity is less than 200 meshes, the coal powder and the powder are uniformly mixed, and then the mixture is fluidized by an injection tank and conveyed by a pipeline, and the coal powder is injected into a rotary area of a blast furnace tuyere by a coal gun.
The specific use effect of the mixed coal powder mixed with the flux is shown in Table 3.
Table 3: effect of flux application
| Item | Proportion of bituminous coal% | Melting Property of Mixed fly Ash, DEG C | Cost of mixed coal powder, yuan/ton |
| Before use | 35 | 1187 | 840 |
| After use | 60 | 1322 | 810 |
| Effect | +25 | +135 | -30 |
By utilizing the secondary products of the iron and steel plant, the flux processing and manufacturing for improving the melting property of the coal for injection can be carried out at low cost, the melting property of the coal for injection of the blast furnace can be obviously improved, after the technical scheme is adopted, the flux can be added, the proportion of bituminous coal can be improved by 25 percent, the melting property of mixed coal dust is improved by 135 ℃, the cost of the mixed coal dust for blast furnace injection is reduced by 30 yuan/ton, and the effect of improving the economy of iron making can be realized.
Example 2 (mixing coal powder for injection in certain iron and steel works as an example)
A flux for improving the melting property of the coal ash for blast furnace blowing has a flux ratio shown in Table 4.
Table 4: flux proportioning scheme
| Kind of material | Proportioning according to% | Particle size |
| Electric furnace steel slag powder | 60 | ≤5mm |
| Dust removal ash | 10 | ≤3mm |
| Quick lime | 20 | ≤3mm |
| Calcite | 10 | ≤5mm |
The electric furnace steel slag powder, the fly ash, the quicklime and the calcite are used as flux raw materials for improving the melting property of the coal ash for blast furnace blowing, the flux raw materials are put into a grinding machine for grinding, the different raw materials are put into a mixing machine according to the proportion, and the mixture is mixed for 40 minutes to prepare the flux.
A method for using fusing agent for improving the melting property of coal ash for blast furnace blowing,
the proportion of the flux in the mixed pulverized coal is determined by adopting the following mathematical relationship:
the blending ratio of the flux in the mixed pulverized coal is shown in Table 5.
Table 5: the proportion of the flux in the mixed pulverized coal is%
| Item | Numerical value |
| The bituminous coal is proportioned according to the proportion | 70.00 |
| Acid-base ratio of dust-removing ash mixed coal powder | 2.03 |
| The ratio of the flux is added% | 2.86 |
The flux is continuously added to the upper part of coal powder of a coal transporting main belt in a coal injection process according to the proportion of 2.86 percent, the coal powder is milled by a medium-speed mill, the granularity is less than 200 meshes, the coal powder and the powder are uniformly mixed, and then the mixture is fluidized by an injection tank and conveyed by a pipeline, and the coal powder is injected into a rotary area of a blast furnace tuyere by a coal gun.
The specific use effect of the mixed coal powder mixed with the flux is shown in Table 6.
Table 6: effect of flux application
| Item | Proportion of bituminous coal% | Melting Property of Mixed fly Ash, DEG C | Cost of mixed coal powder, yuan/ton |
| Before use | 40 | 1180 | 835 |
| After use | 70 | 1334 | 800 |
| Effect | +30 | +154 | -35 |
By utilizing the secondary products of the iron and steel plant, the flux processing and manufacturing for improving the melting property of the coal for injection can be carried out at low cost, the melting property of the coal for injection of the blast furnace can be obviously improved, after the technical scheme is adopted, the flux can be added, the proportion of bituminous coal can be improved by 30 percent, the melting property of mixed coal dust is improved by 154 ℃, the cost of the mixed coal dust for blast furnace injection is reduced by 35 yuan/ton, and the effect of improving the economical efficiency of iron making can be realized.
Example 3 (mixing coal powder for injection in certain iron and steel works as an example)
A flux for improving the melting property of the coal ash for blast furnace injection, the flux proportioning scheme is shown in Table 7.
Table 7: flux proportioning scheme
| Kind of material | Proportioning according to% | Particle size |
| Refined steel slag powder | 40 | ≤5mm |
| Dust removal ash | 15 | ≤3mm |
| Quick lime | 5 | ≤3mm |
| Dolomite | 40 | ≤5mm |
The refined steel slag powder, the fly ash, the quicklime and the calcite are used as flux raw materials for improving the melting property of the coal ash for blast furnace blowing, the flux raw materials are put into a grinding machine for grinding, the different raw materials are put into a mixing machine according to the proportion, and the mixture is mixed for 45min to prepare the flux.
A method for using fusing agent for improving the melting property of coal ash for blast furnace blowing,
the proportion of the flux in the mixed pulverized coal is determined by adopting the following mathematical relationship:
the blending ratio of the flux in the mixed pulverized coal is shown in Table 8.
Table 8: the proportion of the flux in the mixed pulverized coal is%
| Item | Numerical value |
| The bituminous coal is proportioned according to the proportion | 60 |
| Acid-base ratio of dust-removing ash mixed coal powder | 3.18 |
| The ratio of the flux is added% | 2.32 |
The flux is continuously added to the upper part of coal powder of a coal transporting main belt in a coal injection process according to the proportion of 2.32 percent, the coal powder is milled by a medium-speed mill, the granularity is less than 200 meshes, the coal powder and the powder are uniformly mixed, and then the mixture is fluidized by an injection tank and conveyed by a pipeline, and the coal powder is injected into a rotary area of a blast furnace tuyere by a coal gun.
The specific use effect of the mixed pulverized coal mixed with the flux is shown in Table 9.
Table 9: effect of flux application
| Item | Proportion of bituminous coal% | Melting Property of Mixed fly Ash, DEG C | Cost of mixed coal powder, yuan/ton |
| Before use | 40 | 1213 | 835 |
| After use | 60 | 1347 | 805 |
| Effect | +20 | +134 | -30 |
By utilizing the secondary products of the iron and steel plant, the flux processing and manufacturing for improving the melting property of the coal for injection can be carried out at low cost, the melting property of the coal for injection of the blast furnace can be obviously improved, after the technical scheme is adopted, the flux can be added, the proportion of bituminous coal can be improved by 20 percent, the melting property of mixed coal ash can be improved by 134 ℃, the cost of the mixed coal powder for blast furnace injection is reduced by 30 yuan/ton, and the effect of improving the economical efficiency of iron making can be realized.
Example 4 (mixing coal powder for injection in certain iron and steel works as an example)
A flux for improving the melting property of the coal ash for blast furnace injection, the flux proportioning scheme is shown in Table 10.
Table 10: flux proportioning scheme
| Kind of material | Proportioning according to% | Particle size |
| Converter steel slag powder | 60 | ≤5mm |
| Dust removal ash | 5 | ≤3mm |
| Quick lime | 10 | ≤3mm |
| Marble | 25 | ≤5mm |
The converter steel slag powder, the fly ash, the quicklime and the marble are used as flux raw materials for improving the melting property of the coal ash for blowing of the converter, the raw materials are respectively put into a grinding machine for grinding, the raw materials are put into a mixer according to the proportion, and the mixture is mixed for 50min to prepare the flux.
A method for using fusing agent for improving the melting property of coal ash for blast furnace blowing,
the proportion of the flux in the mixed pulverized coal is determined by adopting the following mathematical relationship:
the blending ratio of the flux in the mixed pulverized coal is shown in Table 11.
Table 11: the proportion of the flux in the mixed pulverized coal is%
| Item | Numerical value |
| Proportion of bituminous coal | 55 |
| Acid-base ratio of dust-removing ash mixed coal powder | 4.01 |
| Ratio of flux | 2.16 |
The flux is continuously added to the upper part of coal powder of a coal transporting main belt in a coal injection process according to the proportion of 2.16 percent, the coal powder is milled by a medium-speed mill, the granularity is less than 200 meshes, the coal powder and the powder are uniformly mixed, and then the mixture is fluidized by an injection tank and conveyed by a pipeline, and the coal powder is injected into a rotary area of a blast furnace tuyere by a coal gun.
The specific use effect of the mixed pulverized coal mixed with the flux is shown in Table 12.
Table 12: effect of flux application
| Item | Proportion of bituminous coal% | Melting Property of Mixed fly Ash, DEG C | Cost of mixed coal powder, yuan/ton |
| Before use | 20 | 1239 | 855 |
| After use | 55 | 1340 | 815 |
| Effect | +35 | +101 | -40 |
By utilizing the secondary products of the iron and steel plant, the flux processing and manufacturing for improving the melting property of the coal for injection can be carried out at low cost, the melting property of the coal for injection of the blast furnace can be obviously improved, after the technical scheme is adopted, the flux can be added, the proportion of bituminous coal can be improved by 35 percent, the melting property of mixed coal ash can be improved by 101 ℃, the cost of the mixed coal powder for blast furnace injection is reduced by 40 yuan/ton, and the effect of improving the economical efficiency of iron making can be realized.
Example 5 (mixed coal powder for injection in certain iron and steel works, for example)
A flux for improving the melting property of coal ash for blast furnace injection, the flux proportioning scheme is shown in Table 13.
Table 13: flux proportioning scheme
| Kind of material | Proportioning according to% | Particle size |
| Converter steel slag powder and electric furnace steel slag powder | 50 | ≤5mm |
| Dust removal ash | 5 | ≤3mm |
| Quick lime | 15 | ≤3mm |
| Limestone and dolomite | 30 | ≤5mm |
The converter steel slag powder, the electric furnace steel slag powder, the fly ash, the quick lime, the limestone and the dolomite are used as flux raw materials for improving the melting property of the coal ash for blast furnace blowing, the flux raw materials are put into a grinding machine for grinding, the different raw materials are put into a mixing machine according to the proportion, and the mixture is mixed for 45 minutes to prepare the flux.
A method for using fusing agent for improving the melting property of coal ash for blast furnace blowing,
the proportion of the flux in the mixed pulverized coal is determined by adopting the following mathematical relationship:
the blending ratio of the flux in the mixed pulverized coal is shown in Table 14.
Table 14: the proportion of the flux in the mixed pulverized coal is%
| Item | Numerical value |
| Proportion of bituminous coal | 70 |
| Acid-base ratio of dust-removing ash mixed coal powder | 5.11 |
| Ratio of flux | 1.96 |
The flux is continuously added to the upper part of coal powder of a coal transporting main belt in a coal injection process according to the proportion of 1.96 percent, the coal powder is milled by a medium-speed mill, the granularity is less than 200 meshes, the coal powder and the powder are uniformly mixed, and then the mixture is fluidized by an injection tank and conveyed by a pipeline, and the coal powder is injected into a rotary area of a blast furnace tuyere by a coal gun.
The specific use effect of the mixed pulverized coal mixed with the flux is shown in Table 15.
Table 15: effect of flux application
| Item | Proportion of bituminous coal% | Melting Property of Mixed fly Ash, DEG C | Cost of mixed coal powder, yuan/ton |
| Before use | 30 | 1240 | 845 |
| After use | 70 | 1361 | 800 |
| Effect | +40 | +121 | -45 |
By utilizing the secondary products of the iron and steel plant, the flux processing and manufacturing for improving the melting property of the coal for injection can be carried out at low cost, the melting property of the coal for injection of the blast furnace can be obviously improved, after the technical scheme is adopted, the flux can be added, the proportion of bituminous coal can be improved by 40 percent, the melting property of mixed coal ash can be improved by 121 ℃, the cost of the mixed coal powder for blast furnace injection is reduced by 45 yuan/ton, and the effect of improving the economical efficiency of iron making can be realized.
Example 6 (mixing coal powder for injection in certain iron and steel works as an example)
A flux for improving the melting property of the coal ash for blast furnace injection, the flux proportioning scheme is shown in Table 16.
Table 16: flux proportioning scheme
| Kind of material | Proportioning according to% | Particle size |
| Converter steel slag powder and electric furnace steel slag powder | 40 | ≤5mm |
| Dust removal ash | 5 | ≤3mm |
| Quick lime | 25 | ≤3mm |
| Limestone and calcite | 30 | ≤5mm |
The converter steel slag powder, the electric furnace steel slag powder, the fly ash, the quicklime, the limestone and the calcite are used as flux raw materials for improving the melting property of the coal ash for blast furnace blowing, the raw materials are respectively put into a grinder to be ground, the raw materials are put into a mixer according to the proportion, and the mixture is mixed for 55min to prepare the flux.
A method for using fusing agent for improving the melting property of coal ash for blast furnace blowing,
the proportion of the flux in the mixed pulverized coal is determined by adopting the following mathematical relationship:
the blending ratio of the flux in the mixed pulverized coal is shown in Table 17.
TABLE 17 ratio of flux in mixed pulverized coal,%
| Item | Numerical value |
| The bituminous coal is proportioned according to the proportion | 65 |
| Acid-base ratio of dust-removing ash mixed coal powder | 1.17 |
| The ratio of the flux is added% | 3.36 |
The flux is continuously added to the upper part of coal powder of a coal transporting main belt in a coal injection process according to the proportion of 3.36 percent, the coal powder is milled by a medium-speed mill, the granularity is less than 200 meshes, the coal powder and the powder are uniformly mixed, and then the mixture is fluidized by an injection tank and conveyed by a pipeline, and the coal powder is injected into a rotary area of a blast furnace tuyere by a coal gun.
The specific use effect of the mixed pulverized coal mixed with the flux is shown in Table 18.
TABLE 18 effect of flux
| Item | Proportion of bituminous coal% | Melting Property of Mixed fly Ash, DEG C | Cost of mixed coal powder, yuan/ton |
| Before use | 40 | 1168 | 835 |
| After use | 65 | 1335 | 800 |
| Effect | +25 | +167 | -35 |
By utilizing the secondary products of the iron and steel plant, the flux processing and manufacturing for improving the melting property of the coal for injection can be carried out at low cost, the melting property of the coal for injection of the blast furnace can be obviously improved, after the technical scheme is adopted, the flux can be added, the proportion of bituminous coal can be improved by 25 percent, the melting property of mixed coal ash can be improved by 167 ℃, the cost of the mixed coal powder for blast furnace injection is reduced by 35 yuan/ton, and the effect of improving the economical efficiency of iron making can be realized.
Claims (10)
1. A flux for improving the melting property of coal ash for blast furnace blowing is characterized in that the flux is prepared by respectively grinding and mixing steel slag powder, fly ash, quicklime and calcium-containing stones serving as raw materials; the raw material granularity and the mixing mass ratio are as follows: 20-70% of steel slag powder and the granularity of less than or equal to 8 mm; 10-40% of dust removal ash and less than or equal to 5mm in particle size; 5-20% of quicklime and the granularity is less than or equal to 5 mm; 10 to 40 percent of calcium-containing stones and the granularity of less than or equal to 6 mm.
2. The fusing agent for improving the melting property of the coal ash for blast furnace blowing according to claim 1, wherein the steel slag powder is one or more of converter steel slag powder, electric furnace steel slag powder and refining furnace steel slag powder.
3. The fusing agent for improving the melting property of the coal ash for blast furnace blowing according to claim 1, wherein the part of the steel slag powder with the granularity less than or equal to 5mm accounts for not less than 70 percent of the whole mass of the steel slag powder.
4. The fusing agent for improving the melting property of the coal ash for blast furnace injection according to claim 1, wherein the fly ash is derived from a sintering plant with a binary alkalinity of not less than 1.8.
5. The fusing agent for improving the melting property of the coal ash for blast furnace injection according to claim 1, wherein the content of calcium oxide in the quicklime is not less than 60%.
6. The fusing agent for improving the melting property of the coal ash for blast furnace blowing according to claim 1, wherein the calcium-containing stones are one or more of limestone, calcite, dolomite and marble; wherein the content of calcium oxide in limestone is not less than 40%, the content of calcium oxide in calcite is not less than 40%, the content of calcium oxide in dolomite is not less than 30%, and the content of calcium oxide in marble is not less than 20%.
7. The fusing agent for improving the melting property of the coal ash for blast furnace injection according to claim 1, wherein the calcium-containing stones with the granularity less than or equal to 5mm account for not less than 50 percent of the calcium-containing stones by mass.
8. The use method of the flux for improving the melting property of the coal ash for blast furnace injection according to claim 1, characterized in that the flux is continuously put on the upper part of the coal powder of the coal transporting main belt in the coal injection process, the coal powder is prepared by a medium-speed mill, the coal powder and the coal powder are mixed uniformly, and then the mixture is fluidized by an injection tank and conveyed by a pipeline, and the coal powder is injected into a rotary area of a blast furnace tuyere by a coal gun; the proportion of the flux in the mixed pulverized coal is determined by adopting the following mathematical relationship:
the symbols in the formula:
p is the mass proportion of the flux in the mixed coal powder;
l is the ash content binary acid-base ratio in the mixed coal powder for injection,%;
k1the value range is 0.030-0.034.
9. The use method of the fusing agent for improving the melting property of the coal ash for blast furnace injection according to claim 1, wherein the control range of the ash content of the mixed coal ash is 7-18%.
10. The use method of the fusing agent for improving the melting property of the coal ash for blast furnace blowing according to claim 1, wherein the binary acid-base ratio of the ash in the mixed coal ash is a numerical value of dividing the mass percentage of silica in the coal ash by the mass percentage of calcium oxide.
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