CN113104939A - Method for preparing micro-electrolysis active coke filler by using metallurgical dust and mud - Google Patents
Method for preparing micro-electrolysis active coke filler by using metallurgical dust and mud Download PDFInfo
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Abstract
The invention provides a method for preparing a micro-electrolysis active coke filler by utilizing metallurgical dust and mud. Through the mode, the micro-electrolysis active coke filler prepared by the invention has an iron-carbon integrated structure, a large number of micro-galvanic cells are generated in the treatment process, the electrolysis reaction rate is high, and zinc contained in the raw materials is reduced and gasified at high temperature in the preparation process, so that the generation of filler pores is facilitated, the micro-electrolysis filler has high porosity and specific surface area, and the problems of easy hardening, passivation, blockage and low treatment efficiency of the traditional iron-carbon filler are solved. In addition, the invention widens the resource recycling approach of metallurgical dust mud and iron ore powder, avoids the use of raw materials such as lignite semicoke, coking coal and the like, has simpler preparation process and lower cost, achieves the effect of treating wastes with processes of wastes against one another, and has good development and application prospects.
Description
Technical Field
The invention relates to the technical field of metallurgy and chemical industry, in particular to a method for preparing a micro-electrolysis active coke filler by using metallurgical dust and mud.
Background
The metallurgical dust and mud is used as solid waste produced in the processing and production process of the steel industry, and is rich in a large amount of metal elements with recycling value. Because the metallurgical dust and mud have extremely fine granularity and contain harmful elements, if the metallurgical dust and mud are stacked and not treated, dust is easy to fly to pollute the atmosphere, and a large amount of land resources are occupied and soil is polluted. At present, the main modes for treating metallurgical dust and mud are a solidification treatment method, resource utilization, a sea filling method and the like. Among them, the solidification treatment method and the sea reclamation method do not substantially solve the environmental problems caused by metallurgical dust and sludge, and cannot adapt to the treatment trend of the metallurgical dust and sludge at present. Under the industrial environment that environment-friendly and resource recycling is vigorously advocated in China, the resource recycling of the metallurgical dust and mud becomes a research hotspot, and how to prepare a high-added-value product by using the metallurgical dust and mud is an important research direction in the future.
The micro-electrolysis technology is a sewage treatment technology for decomposing pollutants in wastewater by utilizing the principle of metal electrochemical corrosion, has the advantages of simple process, wide application range, good treatment effect and the like, and is a sewage treatment technology with wide application prospect and research value. The core of the micro-electrolysis technology is iron-carbon filler, and the performance of the iron-carbon filler directly influences the treatment effect of the wastewater. The main components of the metallurgical dust and mud are Fe and C, which are ideal raw materials for preparing the iron-carbon filler. Furthermore, other valuable elements in the metallurgical dust, such as zinc, can have an effect on the improvement of the performance of the micro-electrolysis filler. If the metallurgical dust and sludge discharged by iron and steel enterprises in the processing and production process can be applied to the preparation of the iron-carbon filler, the environmental pollution pressure caused by the metallurgical dust and sludge can be reduced, the cost for treating sewage can be greatly reduced, the purpose of treating wastes with processes of wastes against one another is achieved, and the utilization way of the metallurgical dust and sludge resource is widened.
The patent with publication number CN103274503A provides an iron-carbon micro-electrolysis filler and a preparation method thereof, the iron-carbon micro-electrolysis filler is prepared by mixing lignite semicoke, coking coal, metallurgical iron-containing dust and a binder, forming into spherical particles and activating through micropores, and the problems of easy hardening and easy iron-carbon separation of the traditional micro-electrolysis filler are solved. However, the method needs a large amount of lignite semicoke as a raw material, the lignite semicoke needs to be prepared by the steps of crushing, drying, acid leaching, drying, dry distillation and the like, and the mixed raw material needs to be mechanically formed under a larger pressure, so that the preparation process of the iron-carbon micro-electrolysis filler is complex, the energy consumption and the cost are higher, and the application of the iron-carbon micro-electrolysis filler is limited.
In view of the above, there is a need to design an improved method for preparing micro-electrolysis active coke filler by using metallurgical dust and mud to solve the above problems.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a method for preparing micro-electrolysis active coke filler by using metallurgical dust and mud. The method comprises the steps of mixing metallurgical dust and mud, iron ore powder and a binder in proportion, drying, roasting at high temperature, effectively utilizing the metallurgical dust and mud, preparing the micro-electrolysis active coke filler with high porosity and good adsorption performance by a simple process and low cost, and realizing high-efficiency treatment of wastewater.
In order to achieve the aim, the invention provides a method for preparing micro-electrolysis active coke filler by using metallurgical dust and mud, which comprises the following steps:
s1, mixing the metallurgical dust and mud, the iron ore powder and the binder according to a preset proportion, and performing homogenization treatment to obtain a mixed sample;
s2, drying the mixed sample obtained in the step S1 to obtain a micro-electrolysis active coke filler precursor;
and S3, high-temperature roasting is carried out on the micro-electrolysis active coke filler precursor obtained in the step S2, and the micro-electrolysis active coke filler is obtained.
In a further improvement of the invention, in step S1, the mass ratio of the metallurgical dust mud to the iron ore powder is 1 (0.1-10), and the mass of the binder accounts for 1-30% of the total mass of the mixed sample.
In a further improvement of the invention, in step S1, the mass ratio of the metallurgical dust mud to the iron ore powder is 1 (1-10), and the mass of the binder accounts for 20-30% of the total mass of the mixed sample.
As a further improvement of the invention, in step S1, the mass fraction of total iron in the metallurgical dust mud is not less than 20%, the mass fraction of zinc is not less than 10%, and the iron ore powder is powder which is sieved by a 50-mesh sieve.
As a further improvement of the invention, in step S3, the high-temperature roasting is carried out under the protection of nitrogen, and the flow rate of the nitrogen is 1-10L/min.
As a further improvement of the invention, in step S3, the roasting temperature of the high-temperature roasting is 500-1300 ℃, the heating rate is 1-50 ℃/min, and the heat preservation time is 0-120 min.
As a further improvement of the invention, in step S3, the high-temperature roasting temperature is 1050-1150 ℃, the heating rate is 10 ℃/min, and the heat preservation time is 10-50 min.
As a further improvement of the present invention, in step S1, the metallurgical dust includes, but is not limited to, one or a mixture of several of blast furnace dust, gas mud, steel making dust, rolled iron sheet and sintering machine head ash tail; the iron ore powder is Exisi iron ore powder; the binder is modified coal pitch.
As a further improvement of the invention, the specific surface area of the micro-electrolysis active coke filler obtained in the step S3 is 8.4-10.5 m2The porosity is 59-65%.
As a further improvement of the present invention, in step S2, the shape of the micro-electrolysis active coke filler precursor obtained is a cylinder.
The invention has the beneficial effects that:
(1) the invention takes metallurgical dust and mud, iron ore powder and a binder as raw materials, and prepares the micro-electrolysis active coke filler by mixing, drying and high-temperature roasting the raw materials. Based on the method provided by the invention, not only is the resource recycling way of the metallurgical dust and mud widened, the pollution to the environment caused by improper treatment of the metallurgical dust and mud is avoided, but also the use of raw materials such as lignite semicoke, coking coal and the like is avoided, the preparation process is simpler, the cost is lower, and the method has higher practical application value.
(2) According to the invention, the blast furnace dust, the Esche iron ore powder and the modified coal pitch are preferably selected as raw materials, so that the blast furnace dust can be used as an iron source and a carbon source of the filler, and the generation of pores of the filler can be promoted by using a large amount of zinc contained in the blast furnace dust in a gasification mode in the high-temperature roasting process, the porosity and the specific surface area of the micro-electrolysis filler are effectively improved, and meanwhile, the high-efficiency utilization of the metallurgical dust and mud which are high in zinc content and difficult to utilize is realized. Meanwhile, the Exie iron ore powder is used as low-grade refractory iron ore with low price and high storage capacity, and is mixed with blast furnace dust, so that the utilization rate of resources can be further improved, the Exie iron ore powder can be used as an iron source, the problem of insufficient iron content in the blast furnace dust is effectively solved, and the production cost is greatly reduced. In addition, the modified coal pitch is preferably used as the binder, so that the excellent caking property of the modified coal pitch can be utilized to effectively improve the caking effect between the metallurgical dust and iron ore powder, the prepared precursor can have higher mechanical strength under the condition of no need of mechanical forming, the process is effectively simplified, and the cost is reduced; and the modified coal pitch can also be used as a carbon source of the iron-carbon filler, so that impurities contained in the micro-electrolysis iron-carbon filler are effectively reduced, the service life of the filler is prolonged, and the performance of treating wastewater is improved. Based on the synergistic effect among the blast furnace dust removal ash, the Esci iron ore powder and the modified coal pitch, the invention can effectively improve the performance of the micro-electrolysis active coke filler by a simple process while reducing the cost, and realizes the high-efficiency utilization of resources. On the basis, the invention can ensure the full reaction with the least raw material dosage while ensuring the bonding strength by further controlling the dosage of the metallurgical dust mud, the iron ore powder and the bonding agent, further improve the quality of the micro-electrolysis active coke filler and reduce the preparation cost thereof.
(3) According to the invention, the prepared micro-electrolysis active coke filler precursor is roasted at high temperature, so that the prepared micro-electrolysis active coke filler has an iron-carbon integrated structure, a large number of micro-galvanic cells are generated in the treatment process, the electrolysis reaction rate is high, and the wastewater treatment efficiency is higher than that of the traditional non-fired iron-carbon filler; on the basis, the roasting temperature and the heat preservation time in the high-temperature roasting process are regulated, so that the micro-electrolysis active coke filler can be promoted to be formed, a large amount of zinc element contained in the raw material is gasified at high temperature, and the generation of air holes in the filler is promoted, so that the prepared micro-electrolysis active coke filler has large porosity and specific surface area, can effectively adsorb large particles in wastewater, and solves the problems that the traditional iron-carbon filler is easy to harden, passivate and block, and the treatment efficiency is low.
Drawings
FIG. 1 is a pictorial representation of a microelectrolytic active coke filler made in accordance with example 1 of the present invention.
FIG. 2 is a graph showing the change of the removal rate of the micro-electrolysis active coke filler prepared in different proportions when used for treating methyl orange wastewater.
FIG. 3 is a graph showing the change of the removal rate of the micro-electrolysis active coke filler prepared under different heat preservation times when treating methyl orange wastewater.
FIG. 4 is a graph showing the change of the removal rate of the micro-electrolysis active coke filler prepared at different roasting temperatures when treating methyl orange wastewater.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps closely related to the aspects of the present invention are shown in the drawings, and other details not closely related to the present invention are omitted.
In addition, it is also to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention provides a method for preparing micro-electrolysis active coke filler by using metallurgical dust and mud, which comprises the following steps:
s1, mixing the metallurgical dust and mud, the iron ore powder and the binder according to a preset proportion, and performing homogenization treatment to obtain a mixed sample;
s2, drying the mixed sample obtained in the step S1 to obtain a micro-electrolysis active coke filler precursor;
and S3, high-temperature roasting is carried out on the micro-electrolysis active coke filler precursor obtained in the step S2, and the micro-electrolysis active coke filler is obtained.
In step S1, the mass ratio of the metallurgical dust mud to the iron ore powder is 1 (0.1-10), and the mass of the binder accounts for 1-30% of the total mass of the mixed sample; preferably, the mass ratio of the metallurgical dust mud to the iron ore powder is 1 (1-10), and the mass of the binder accounts for 20-30% of the total mass of the mixed sample. The mass fraction of total iron in the metallurgical dust and mud is more than or equal to 20%, the mass fraction of zinc is more than or equal to 10%, and the iron ore powder is powder which is sieved by a 50-mesh sieve. The metallurgical dust and mud comprises but is not limited to one or a mixture of several of blast furnace dust removal ash, gas mud, steel making dust and mud, steel sheet rolled and sintering machine head ash machine tail ash; the iron ore powder is Exisi iron ore powder; the binder is modified coal pitch.
In step S2, the shape of the obtained micro-electrolysis active coke filler precursor is a cylinder.
In step S3, the high-temperature roasting is carried out under the protection of nitrogen, and the flow rate of the introduced nitrogen is 1-10L/min; preferably, the nitrogen is introduced at a flow rate of 1L/min. The roasting temperature of the high-temperature roasting is 500-1300 ℃, the heating rate is 1-50 ℃/min, and the heat preservation time is 0-120 min; preferably, the roasting temperature of the high-temperature roasting is 1050-1150 ℃, the heating rate is 10 ℃/min, and the heat preservation time is 10-50 min; the specific surface area of the obtained micro-electrolysis active coke filler is 8.4-10.5 m2The porosity is 59-65%.
Example 1
The embodiment provides a method for preparing a micro-electrolysis active coke filler by using metallurgical dust and sludge, which comprises the following steps:
s1, mixing the metallurgical dust and mud, the iron ore powder and the binder according to the mass ratio of 3.9:4.1:2, continuously stirring, and carrying out homogenization treatment to obtain a mixed sample;
s2, drying the mixed sample obtained in the step S1 to obtain a micro-electrolysis active coke filler precursor;
s3, placing the micro-electrolysis active coke filler precursor obtained in the step S2 in a muffle furnace, introducing nitrogen according to the flow of 1L/min, heating to 1100 ℃ at the heating rate of 10 ℃/min under the protection of nitrogen, roasting at high temperature, and preserving heat for 30min to obtain the micro-electrolysis active coke filler.
Wherein, the metallurgical dust and mud used in the embodiment is blast furnace dust, and the total iron content of the metallurgical dust and mud is 23.27 wt%, the zinc content of the metallurgical dust and mud is 10.52 wt%, and the carbon content of the metallurgical dust and mud is 45.7 wt%; the iron ore powder is the Exie iron ore powder which has the total iron content of 55.15 percent and is sieved by a 50-mesh sieve; the binder is modified coal pitch.
The physical diagram of the micro-electrolysis active coke filler prepared in the embodiment is shown in figure 1. As can be seen from figure 1, the micro-electrolysis active coke filler prepared by the embodiment has a cylindrical structure, is loose and porous in surface, has high porosity and specific surface area, can effectively adsorb large particles in wastewater, and avoids the problems of easy hardening, passivation, blockage and low treatment efficiency of the traditional iron-carbon filler.
Examples 2 to 3
Embodiments 2 to 3 respectively provide a method for preparing a micro-electrolysis active coke filler by using metallurgical dust and sludge, and compared with embodiment 1, the method is different in that the mass ratio of the metallurgical dust and sludge, iron ore powder and a binder is adjusted.
In examples 2 and 3, the mass ratio of blast furnace dust, the Esche iron ore powder and the modified coal pitch is 2.84:5.16:2 and 2.27:5.73:2, respectively, and the rest steps and process parameters are consistent with those of example 1 and are not repeated.
Tests show that the specific surface areas of the micro-electrolysis active coke fillers prepared in the examples 1 to 3 are 8.7m2/g、9.2m2G and 10.5m2The porosity is 59 percent, 62 percent and 65 percent respectively, which shows that the micro-electrolysis active coke filler prepared by the method provided by the invention has higher specific surface area and porosity.
In order to compare the wastewater removal effects of the micro-electrolysis active coke fillers prepared in different proportions, taking methyl orange wastewater as an example, the micro-electrolysis active coke fillers prepared in examples 1 to 3 are respectively ground and sieved, and powdery fillers with the particle size of less than 0.1mm are used in a methyl orange simulation wastewater treatment experiment, so that a graph showing the removal rate change of the micro-electrolysis active coke fillers prepared in examples 1 to 3 when the micro-electrolysis active coke fillers are used for treating the methyl orange wastewater is shown in fig. 2.
As can be seen from FIG. 2, the change of the mixture ratio among the metallurgical dust and mud, the iron ore powder and the coal tar pitch has a great influence on the performance of the prepared micro-electrolysis active coke filler. Meanwhile, in a certain range, the prepared micro-electrolysis active coke filler shows higher methyl orange removal rate along with the increase of the content of the iron ore powder in the mixed sample. When the using amount of the filler is 5g and the treatment time is 1h, the removal rates of the micro-electrolysis active coke filler prepared in the examples 1-3 on methyl orange are 68.6%, 77.2% and 99.8%, respectively, and the excellent wastewater treatment effect is shown.
Examples 4 to 5
Embodiments 4 to 5 respectively provide a method for preparing a micro-electrolysis active coke filler by using metallurgical dust and sludge, and compared with embodiment 1, the method is different in that the heat preservation time of the high-temperature roasting process in step S3 is changed.
The heat preservation time of the embodiment 4 and the embodiment 5 is 40min and 50min respectively, and the rest steps and process parameters are consistent with those of the embodiment 1, and are not described again.
Tests prove that the micro-electrolysis active coke fillers prepared in the embodiments 4-5 have higher specific surface area and porosity. Wherein the specific surface areas of the micro-electrolysis active coke fillers prepared in the embodiments 4 to 5 are respectively 8.9m2G and 9.1m2In terms of a/g, the porosity was 60% and 61%, respectively.
In order to compare the wastewater removal effects of the micro-electrolysis active coke fillers prepared under different heat preservation times, the removal rates of the micro-electrolysis active coke fillers prepared in the embodiments 1 and 4-5 in the methyl orange wastewater treatment process were tested according to the above method, and the change chart of the removal rates is shown in fig. 3.
As can be seen from FIG. 3, when the roasting temperature is constant, the change of the holding time has a great influence on the performance of the prepared micro-electrolysis active coke filler. Within a certain range, the prolonged heat preservation time can lead to the reduction of the methyl orange removal rate of the prepared micro-electrolysis active coke filler. When the using amount of the filler is 5g and the treatment time is 1h, the removal rates of the micro-electrolysis active coke filler prepared in the embodiments 4-5 to methyl orange are 74.4% and 71.8% respectively, and the micro-electrolysis active coke filler has a good wastewater treatment effect.
Examples 6 to 7
Embodiments 6 to 7 respectively provide a method for preparing a micro-electrolysis active coke filler from metallurgical dust and sludge, and compared with embodiment 1, the difference is that the roasting temperature in the high-temperature roasting process in step S3 is adjusted.
The corresponding calcination temperatures of example 6 and example 7 are 1050 ℃ and 1150 ℃, respectively, and the rest steps and process parameters are consistent with those of example 1, and are not repeated herein.
Tests prove that the specific surface areas of the micro-electrolysis active coke fillers prepared in examples 6 to 7 are 8.4m2G and 9.4m2In terms of a/g, the porosity was 60% and 61%, respectively.
In order to compare the wastewater removal effects of the micro-electrolysis active coke fillers prepared at different roasting temperatures, the removal rates of the micro-electrolysis active coke fillers prepared in examples 1 and 6 to 7 in the methyl orange wastewater treatment process were tested according to the above method, and the change graph of the removal rates is shown in fig. 4.
As can be seen from FIG. 4, when the holding time is fixed, the change of the roasting temperature has a great influence on the performance of the prepared micro-electrolysis active coke filler. Within a certain range, the methyl orange removal rate of the prepared micro-electrolysis active coke filler is increased and then decreased along with the increase of the roasting temperature. When the using amount of the filler is 5g and the treatment time is 1h, the removal rates of the micro-electrolysis active coke filler prepared in the embodiments 6 to 7 on methyl orange are 66.1% and 80.0% respectively, and the micro-electrolysis active coke filler shows a good wastewater treatment effect.
Comparative examples 1 to 3
Comparative examples 1-3 respectively provide a method for preparing a micro-electrolysis active coke filler by using metallurgical dust and sludge, compared with example 1, the difference is that the ratio of the metallurgical dust and sludge, iron ore powder and a binder and the roasting temperature and heat preservation time in the high-temperature roasting process are changed, and the rest steps are consistent with example 1 and are not repeated herein.
The preparation parameters corresponding to each proportion and the removal rate of the prepared micro-electrolysis active coke filler on methyl orange are shown in table 1, wherein the experimental parameters of the simulated wastewater treatment of the methyl orange in each proportion are consistent with those of example 1.
TABLE 1 preparation parameters for comparative examples 1 to 3
As can be seen from table 1, although increasing the content of the iron ore powder within a certain range can improve the removal rate of methyl orange, the excessive iron ore powder will result in the decrease of the removal rate of methyl orange and increase the preparation cost. Meanwhile, too high roasting temperature or heat preservation time is not beneficial to improving the performance of the micro-electrolysis coke filler, and the removal rate of methyl orange is reduced while the cost is increased. Therefore, the invention can prepare the micro-electrolysis active coke filler with high porosity and good adsorption performance by simple process and lower cost through regulating and controlling the mass ratio of the metallurgical dust and mud, the iron ore powder and the binder, the roasting temperature and the heat preservation time, thereby realizing the high-efficiency treatment of the wastewater.
In conclusion, the invention provides a method for preparing a micro-electrolysis active coke filler by utilizing metallurgical dust and mud, which is characterized in that the micro-electrolysis active coke filler is prepared by uniformly mixing the metallurgical dust and mud, iron ore powder and a binder in proportion, drying and then roasting at high temperature. Through the mode, the micro-electrolysis active coke filler prepared by the invention has an iron-carbon integrated structure, a large number of micro-galvanic cells are generated in the treatment process, the electrolysis reaction rate is high, zinc contained in the raw materials is reduced and gasified at high temperature in the preparation process, the generation of filler pores is facilitated, the prepared micro-electrolysis filler has high porosity and specific surface area, large particles in wastewater can be effectively adsorbed, and the problems of easiness in hardening, passivation and blockage and low treatment efficiency of the traditional iron-carbon filler are solved. In addition, the invention widens the resource recycling approach of metallurgical dust mud and iron ore powder, avoids the use of raw materials such as lignite semicoke, coking coal and the like, has simpler preparation process and lower cost, achieves the effect of treating wastes with processes of wastes against one another, and has good development and application prospects.
It should be noted that, when the microelectrolytic active coke filler is prepared by using the metallurgical dust and mud, the mass ratio of the metallurgical dust and mud to the iron ore powder can be adjusted between 1 (0.1-10), and is preferably 1 (1-10); the mass fraction of the binder in the total amount of the mixed sample can be adjusted between 1% and 30%, and is preferably 20% to 30%. In the high-temperature roasting process, the introduction flow of nitrogen can be adjusted between 1L/min and 10L/min; the roasting temperature can be 500-1300 ℃, and is preferably 1050-1150 ℃; the heating rate can be 1-50 ℃/min, and preferably 10 ℃/min; the heat preservation time can be 0-120 min, and preferably 10-50 min. Meanwhile, the metallurgical dust and mud in the invention can be one or a mixture of several of blast furnace dust removal ash, gas mud, steel making dust and mud, steel sheet rolled and sintering machine head ash and tail ash, and all belong to the protection scope of the invention.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the present invention.
Claims (10)
1. A method for preparing micro-electrolysis active coke filler by using metallurgical dust and mud is characterized by comprising the following steps:
s1, mixing the metallurgical dust and mud, the iron ore powder and the binder according to a preset proportion, and performing homogenization treatment to obtain a mixed sample;
s2, drying the mixed sample obtained in the step S1 to obtain a micro-electrolysis active coke filler precursor;
and S3, high-temperature roasting is carried out on the micro-electrolysis active coke filler precursor obtained in the step S2, and the micro-electrolysis active coke filler is obtained.
2. The method for preparing the micro-electrolysis active coke filler by using the metallurgical dust and mud as claimed in claim 1, is characterized in that: in step S1, the mass ratio of the metallurgical dust mud to the iron ore powder is 1 (0.1-10), and the mass of the binder accounts for 1-30% of the total mass of the mixed sample.
3. The method for preparing the micro-electrolysis active coke filler by using the metallurgical dust and mud as claimed in claim 2, is characterized in that: in step S1, the mass ratio of the metallurgical dust mud to the iron ore powder is 1 (1-10), and the mass of the binder accounts for 20-30% of the total mass of the mixed sample.
4. The method for preparing the micro-electrolysis active coke filler by using the metallurgical dust and mud as claimed in claim 1, is characterized in that: in step S1, the mass fraction of total iron in the metallurgical dust and mud is not less than 20%, the mass fraction of zinc is not less than 10%, and the iron ore powder is powder passing through a 50-mesh sieve.
5. The method for preparing the micro-electrolysis active coke filler by using the metallurgical dust and mud as claimed in claim 1, is characterized in that: in step S3, the high-temperature roasting is performed under the protection of nitrogen, and the flow rate of the nitrogen is 1-10L/min.
6. The method for preparing the micro-electrolysis active coke filler by using the metallurgical dust and mud as claimed in claim 1, is characterized in that: in step S3, the high-temperature roasting temperature is 500-1300 ℃, the heating rate is 1-50 ℃/min, and the heat preservation time is 0-120 min.
7. The method for preparing the micro-electrolysis active coke filler by using the metallurgical dust and mud as claimed in claim 6, is characterized in that: in step S3, the high-temperature roasting temperature is 1050-1150 ℃, the heating rate is 10 ℃/min, and the heat preservation time is 10-50 min.
8. The method for preparing the micro-electrolysis active coke filler by using the metallurgical dust and mud as claimed in claim 1, is characterized in that: in step S1, the metallurgical dust includes, but is not limited to, one or a mixture of several of blast furnace dust, gas mud, steel making dust, rolled iron sheet and sintering machine head ash tail; the iron ore powder is Exisi iron ore powder; the binder is modified coal pitch.
9. The method for preparing the micro-electrolysis active coke filler by using the metallurgical dust and mud as claimed in any one of claims 1 to 8, wherein the method comprises the following steps: the specific surface area of the micro-electrolysis active coke filler obtained in the step S3 is 8.4-10.5 m2The porosity is 59-65%.
10. The method for preparing the micro-electrolysis active coke filler by using the metallurgical dust and mud as claimed in any one of claims 1 to 9, which is characterized in that: in step S2, the shape of the obtained micro-electrolysis active coke filler precursor is a cylinder.
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| CN114150150A (en) * | 2021-11-23 | 2022-03-08 | 苏州大学 | Nano zero-valent iron based on blast furnace dust and preparation method thereof |
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