CN114317885B - Biomass electric furnace foaming agent and preparation method and application method thereof - Google Patents
Biomass electric furnace foaming agent and preparation method and application method thereof Download PDFInfo
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Abstract
The invention discloses a biomass electric furnace foaming agent, a preparation method and an application method thereof, and belongs to the technical field of metallurgy. The invention relates to a biomass electric furnace foaming agent which comprises the following components in percentage by weight: 1-30% of coke powder, 50-90% of biomass hydrothermal carbon powder, 5-10% of semi-coke powder and 4-10% of limestone powder. According to the preparation method of the biomass electric furnace foaming agent, the hydrothermal carbon powder, the coke powder, the blue carbon powder and the limestone powder are uniformly mixed according to the weight percentage, and then drying treatment is carried out, so as to obtain the electric furnace foaming agent. The foaming agent disclosed by the invention has a good foaming effect, can simultaneously ensure the foaming strength and the foaming time, solves the problems of nonuniform foaming of electric furnace slag and the like caused by the blowing of a conventional foaming agent, can utilize biomass energy while improving the utilization rate of an electric furnace, and effectively reduces the carbon emission in the steelmaking process of the electric furnace.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a biomass electric furnace foaming agent and a preparation method and an application method thereof.
Background
At present, in the smelting process of electric arc furnace steelmaking at home and abroad, foam slag making is a widely used technology. In the smelting process, when gas enters the molten slag and is dispersed into micro bubbles without polymerizing, the volume of the molten slag expands, a honeycomb-shaped air hole structure which is separated by partition membranes and densely arranged is formed and stays for a certain time, and the slag with the structure is called foam slag, namely, the thickness of the molten slag is increased on the premise of not increasing the slag quantity. The manufacturing of the foamed slag can realize the technical effects of improving the heat transfer condition of the electric arc, improving the heat efficiency, reducing the radiation heat erosion of the electric arc to the furnace wall and the furnace cover of the electric furnace, stabilizing the electric arc, reducing the noise and the arc light irradiation, improving the working environment in front of the furnace and the like. The foaming slag technology mainly comprises a blowing method and a direct adding method, and aims to create more air sources for pushing slag foaming and improve the foaming performance of the slag by adopting additional technical means.
The blowing method is mainly to blow iron scale, carbon powder, silicon powder, lime powder and the like while blowing oxygen. The iron scale can play a certain role in quickly dissolving lime by blowing, and the slag contains a certain amount of iron oxide, so that the fluidity of the slag can be improved to improve the foaming performance of the slag; carbon powder is injected to the slag layer to promote the carbon powder to react with the oxide so as to release gas required by slag foaming; the silicon powder can promote the pre-reduction of the chromium oxide in the slag, and avoid the over-adhesion of the slag caused by the over-high chromium oxide in the slag. Lime powder is an important cosolvent in the steel-making process, and is generally prepared by calcining limestone, and blowing the lime powder is favorable for slagging and promoting the removal of sulfur and phosphorus. The blowing method has the disadvantages that the blown materials are difficult to be uniformly dispersed in the slag layer, and meanwhile, the generated CO bubbles are excessively concentrated on the upper part of the slag layer, so that the slag can not be wholly pushed to foam.
The direct addition method is to add the foaming agent pellets or foaming balls into the smelting bath through a silo or a dedicated addition device. In the prior art, two or more raw materials, namely limestone, dolomite, coke and iron scale, are mainly used as main raw materials to be combined into a foaming agent briquette or foaming ball. The direct addition method has the defects that the limestone or dolomite has low thermal decomposition temperature, high foaming speed and can not be foamed continuously; after the foaming agent or the foaming ball is added into the molten pool, the foaming agent or the foaming ball stays on the surface of the steel slag, and the generated gas escapes from the surface of the steel slag, so that the foaming effect is poor; meanwhile, the preparation process of the foaming agent block or foaming ball is relatively complex.
In addition, the prior art has common problems that the foaming at the upper part of the molten pool is not uniform and the foaming effect at the bottom is poor. In order to achieve a long-lasting foaming of the electric furnace slag, foaming agents have been developed to promote the foaming of the electric furnace slag. In the smelting process of an electric arc furnace in a short-flow steelmaking process, the main components of a traditional foaming agent are mainly coke powder and coal powder, the carbon emission carried by the foaming agent accounts for a larger proportion of the carbon emission in the process, low-carbon metallurgy becomes an important trend for the development of metallurgical industry under the current backgrounds of energy conservation and emission reduction and a 'double-carbon' policy era, the reduction of the carbon emission of the electric furnace foaming agent becomes a major challenge facing the metallurgical industry, the reduction of the carbon emission of the electric furnace foaming agent is imperative, and the research of the electric furnace foaming agent capable of optimizing the foaming behavior of electric furnace slag while reducing the carbon emission in electric furnace smelting has important significance.
For example, the application with the Chinese patent application number of 201811633226.X discloses a foaming agent for an electric furnace and a manufacturing method, the foaming agent of the application comprises waste tire rubber powder, blue carbon powder and raw dolomite powder, the foaming method is that slag forming materials added in electric furnace smelting are melted and then are injected into the electric furnace foaming agent, then the power transmission power is improved by 30-40%, and the problem that chromium is easily oxidized into chromium oxide in stainless steel production to cause lower content of iron oxide in slag is solved; however, the method has the defects that dolomite is low in thermal decomposition temperature and high in foaming speed, cannot foam for a long time, a foaming agent stays on the surface of steel slag after being injected into a molten pool, generated gas escapes from the surface of the steel slag, the foaming effect is poor, and the effect of reducing the foaming strength to increase the foaming time cannot be realized. For another example, the limestone and dolomite in the application with the Chinese patent application number of 200610028552.9 have the component proportions of 20-60% and 20-50% respectively; the limestone and dolomite in the application of 92107084.5 have the proportion of 40-70% and 5-20% respectively, and the above problems also exist in the two.
Disclosure of Invention
1. Problems to be solved
The patent aims to solve the problems that the existing foaming agent is easy to accumulate on the upper part of molten steel and is difficult to push the whole foaming, so that the foaming is not uniform and thorough, and the foaming is difficult to be lastingly foamed. The foaming agent disclosed by the invention has a good foaming effect, can simultaneously ensure the foaming strength and the foaming time, improves the utilization rate of an electric furnace, and can effectively solve the problem that a large amount of carbon dioxide is discharged due to the use of the traditional foaming agent.
2. Technical scheme
In order to solve the problems, the technical scheme adopted by the invention is as follows:
the invention relates to a biomass electric furnace foaming agent which comprises the following components in percentage by weight: 1-30% of coke powder, 50-90% of biomass hydrothermal carbon powder, 5-10% of semi-coke powder and 4-10% of limestone powder.
Furthermore, the particle sizes of the coke powder, the biomass hydrothermal carbon powder, the blue carbon powder and the limestone powder are all 200-18 meshes.
According to the preparation method of the biomass electric furnace foaming agent, the hydrothermal carbon powder, the coke powder, the blue carbon powder and the limestone powder are uniformly mixed according to the weight percentage, and then drying treatment is carried out, so as to obtain the electric furnace foaming agent.
Furthermore, the preparation process of the hydrothermal carbon powder comprises the following steps: mixing sawdust and water, placing the mixture into a reaction kettle for reaction, heating to 240-265 ℃ at a reaction temperature rise rate of 3.5-4.5 ℃/min, and keeping the temperature for 1-1.5 h; and cooling to room temperature after the reaction is finished, and performing suction filtration, drying, crushing and screening treatment on the reaction residue to obtain the hydrothermal carbon powder.
Further, before the reaction, introducing inert gas into the kettle body through the gas inlet, discharging the inert gas from the gas outlet, repeating the reaction for 3 to 5 times, and each time for 1 to 2min to discharge air; and after the heat preservation reaction is finished, carrying out water bath cooling on the reaction kettle, opening a gas outlet of the reaction kettle after the temperature is reduced, and taking out a reaction product after all gas is discharged.
Further, the hydrothermal carbon powder, the coke powder, the blue carbon powder and the limestone powder are put into a powder mixer to be stirred and mixed, and the rotating speed of the powder mixer is 150 r/min-350 r/min; the mixing time is 3min to 10min, and the mixing is repeated for 3 to 5 times.
Furthermore, the components are uniformly mixed and then are dried at the temperature of 100-110 ℃.
The application method of the biomass electric furnace foaming agent comprises the steps of mixing the biomass electric furnace foaming agent with electric furnace slag, then carrying out sample pressing treatment, and then placing the mixture in a heating furnace for heating.
Furthermore, the foaming agent accounts for 4.5-6% of the balance weight of the electric furnace slag, the sample pressing pressure is 12-18 MPa, and the duration is 2-4 min.
3. Advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
(1) The biomass electric furnace foaming agent comprises coke powder, biomass hydrothermal carbon powder, semi-coke powder and limestone powder, and can effectively improve the foaming effect of electric furnace slag through compounding of the components, particularly through compounding of the coke powder and the biomass hydrothermal carbon powder, so that the electric furnace slag can be foamed more uniformly and thoroughly, and the foaming strength and the foaming time can meet the use requirements.
(2) According to the biomass electric furnace foaming agent, the ratio of the coke to the hydrothermal carbon is regulated, the artificial control of the foaming strength and the foaming time can be realized to a certain extent, the comprehensive performance is strong, the controllability is high, and the weight ratio of the foaming agent can be regulated as required. Meanwhile, the biomass energy can be effectively utilized while the utilization rate of the electric furnace is improved, and based on the characteristics of wide biomass energy source, low price, clean energy, self-circulation and the like, the aims of increasing enterprise benefits, reducing emission of carbon, neutralizing carbon and green production are favorably fulfilled, and the method has obvious environmental protection and economic benefits.
(3) According to the application method of the biomass electric furnace foaming agent, the biomass electric furnace foaming agent and the electric furnace slag are mixed and then subjected to sample pressing treatment, and then the mixture is placed in the heating furnace for heating, so that the uniformity and the full performance of foaming can be effectively ensured, the heat efficiency of the electric furnace is improved, and the reduction of carbon emission is facilitated.
Drawings
FIG. 1 is a schematic flow diagram of a blowing agent production process of the present invention;
FIGS. 2 to 6 are graphs showing the foaming effects of the foaming agents obtained in examples 1 to 5 applied to an electric furnace, respectively;
FIG. 7 is a graph showing the comparison between the foaming effect of the foaming agent obtained in example 1 and that of the foaming agent in comparative example 1 applied to an electric furnace.
Detailed Description
The present invention is further illustrated by the following specific examples.
Example 1
The biomass electric furnace foaming agent comprises the following components in percentage by weight: 30% of coke powder, 50% of biomass hydrothermal carbon powder, 10% of semi-coke powder and 10% of limestone powder, wherein the particle sizes of the coke powder, the biomass hydrothermal carbon powder, the semi-coke powder and the limestone powder are all 200-18 meshes (0.075 mm-1 mm).
The coke can provide partial heat energy, increase the gas release speed and improve the peak value of the foaming strength of the electric furnace slag, but a violent reaction can occur after the reaction process reaches a certain critical value, the gas release speed is too high, and the foaming time is short; the addition of the hydrothermal carbon can make the reaction stably proceed, stabilize the gas generation rate, reduce the foaming strength of the electric furnace slag, prolong the foaming duration of the electric furnace slag to a certain extent and make the electric furnace slag foamed more uniformly; the semi-coke has the characteristics of high fixed carbon content, low ash content, large specific resistance and the like, is a novel clean energy source, is used for supplementing and replacing the semi-coke, and can improve the economic benefit and realize green production. Limestone (calcium carbonate) can adjust the viscosity to a certain degree, the calcium carbonate can be used as a nucleating agent, the calcium carbonate can adsorb foaming gas to form bubble nuclei, and the number of the bubbles is controlled to make the bubbles finer; meanwhile, the calcium carbonate has higher rigidity and can slow down the deformation and the moving capability of the melt, thereby inhibiting the too fast expansion of the cells, controlling the cell size to be thinner and playing a role in promoting stability.
In the embodiment, through the compounding of the components, under the combined action of the components, the foaming time and the foaming strength can be simultaneously adjusted, and the proportion content of the hydrothermal carbon is properly increased, so that the proportion content of the coke is reduced, the foaming duration can be prolonged as much as possible under a certain foaming strength, and the foaming is more thorough; the foaming agent has strong comprehensive capacity and wide adjustable proportioning range, reduces the traditional preparation steps and can control the gas forming rate to a certain extent; meanwhile, the addition of the semi-coke and the calcium carbonate reduces the production cost, ensures the viscosity and can be used as an auxiliary gas source after the reaction.
In addition, the biomass energy is used as energy with zero emission of carbon dioxide, and the application of the biomass energy in ferrous metallurgy instead of fossil energy becomes an important means for reducing emission of carbon dioxide in ferrous metallurgy. However, biomass cannot be directly used as a raw material for production of iron and steel enterprises due to high volatile components, low fixed carbon and low heat value; before the biomass is utilized, the biomass is usually pretreated in a carbonization mode, the traditional carbonization mode is pyrolysis carbonization, but the biochar generated in the carbonization mode contains a large amount of alkali metals such as potassium, sodium and the like, and the quality of molten steel of an electric furnace can be influenced. The embodiment adopts the hydrothermal carbon to replace coal powder and coke powder, thereby effectively reducing the carbon dioxide emission in the steelmaking process of the electric arc furnace and being beneficial to responding green production.
As shown in fig. 1, in the method for manufacturing the biomass electric furnace foaming agent of the embodiment, hydrothermal carbon powder, coke powder, blue carbon powder and limestone powder are placed in a mixing machine according to the weight percentage, stirred and mixed uniformly, the rotating speed of the mixing machine is 300r/min, the mixing time is 8min, and the mixing is repeated for 3 times; then drying at 102 ℃ to obtain the electric furnace foaming agent. Wherein, the coke powder, the blue carbon powder and the limestone powder are crushed by a crusher, then are put into a crusher for crushing, and are circularly crushed until the granularity reaches 200-18 meshes.
The preparation process of the hydrothermal carbon powder comprises the following steps: putting the wood chips into a vacuum drying oven for drying for 12 hours to complete the removal of water, weighing a certain amount of wood chips, putting the wood chips into a reaction cup, adding water into the cup according to the proportion of 1; after the assembly is finished, introducing inert gas (nitrogen) into the kettle body from the gas inlet, discharging from the gas outlet, repeating for 3 times, and discharging for 1min each time to remove air; an electromagnetic stirrer is arranged at the bottom of the reaction kettle, and the stirring speed is 350r/min; the experimental heating rate is 3.5 ℃/min, and the temperature is kept at 240 ℃ for 1h. After the heat preservation is finished, carrying out water bath cooling on the reaction kettle to rapidly cool the reaction kettle to room temperature, slowly opening the gas outlet at the moment, opening the reaction kettle to discharge all gas, taking out the cup body, carrying out suction filtration and drying on residues in the cup body, wherein the yield is 35.60%, then crushing the reaction kettle, and screening out hydrothermal carbon with the granularity of 200-18 meshes (0.075 mm-1 mm).
The biomass electric furnace foaming agent of the embodiment is mixed with electric furnace slag, then sample pressing treatment is carried out, and then the mixture is placed in a heating furnace for electric furnace foaming application, wherein the foaming agent accounts for 5% of the balance weight of the electric furnace slag, the sample pressing pressure is 15MPa, and the duration is 3min. The composition of the electric furnace slag is shown in the following table 1.
TABLE 1 electric furnace slag compositions and composition proportions
Comparative example 1
The blowing agent composition of this comparative example was: 80% of coke powder, 10% of semi-coke powder and 10% of limestone powder, wherein the particle sizes of the coke powder, the semi-coke powder and the limestone powder are all 200-18 meshes (0.075 mm-1 mm).
As can be seen from FIG. 7, when part of hydrothermal carbon is added to replace the coke powder, the strength peak value of the foaming agent is reduced, but the foaming duration is effectively prolonged, i.e. the foaming peak strength and the foaming duration can be ensured simultaneously by compounding the hydrothermal carbon and the coke powder.
Example 2
The biomass electric furnace foaming agent comprises the following components in percentage by weight: 22% of coke powder, 60% of biomass hydrothermal carbon powder, 10% of blue carbon powder and 8% of limestone powder, wherein the particle sizes of the coke powder, the biomass hydrothermal carbon powder, the blue carbon powder and the limestone powder are all 200-18 meshes (0.075 mm-1 mm).
As shown in fig. 1, in the method for manufacturing the biomass electric furnace foaming agent of the embodiment, hydrothermal carbon powder, coke powder, blue carbon powder and limestone powder are placed in a mixing machine according to the weight percentage, stirred and mixed uniformly, the rotating speed of the mixing machine is 240r/min, the mixing time is 7min, and the mixing is repeated for 5 times; and then drying at 106 ℃ to obtain the electric furnace foaming agent. Wherein, the coke powder, the blue carbon powder and the limestone powder are crushed by a crusher, then are put into a crusher for crushing, and are circularly crushed until the granularity reaches 200-18 meshes.
The preparation process of the hydrothermal carbon powder comprises the following steps: putting the sawdust into a vacuum drying oven for drying for 12h to complete moisture removal, weighing a certain amount of sawdust and putting the sawdust into a reaction cup, adding water into the cup according to the proportion of 1:8, wherein the volume of the mixture of the sawdust and the water is not more than half 1/2 of the volume of the reaction cup, putting a magnetic rotor into the reaction cup, and putting the magnetic rotor into a reaction kettle; after the assembly is finished, introducing inert gas (nitrogen) into the kettle body from the gas inlet, discharging from the gas outlet, repeating for 5 times, and discharging for 1min each time to remove air; an electromagnetic stirrer is arranged at the bottom of the reaction kettle, and the stirring speed is 350r/min; the experimental heating rate is 4.5 ℃/min, and the temperature is kept at 265 ℃ for 1.5h. After the heat preservation is finished, carrying out water bath cooling on the reaction kettle to rapidly cool the reaction kettle to room temperature, slowly opening the gas outlet at the moment, opening the reaction kettle to discharge all gas, taking out the cup body, carrying out suction filtration and drying on residues in the cup body, then crushing the residues, and screening out the hydrothermal carbon with the granularity of 200-18 meshes (0.075 mm-1 mm).
The biomass electric furnace foaming agent of the embodiment is mixed with electric furnace slag, then sample pressing treatment is carried out, and then the mixture is placed in a heating furnace for electric furnace foaming application, wherein the foaming agent accounts for 4.5% of the balance weight of the electric furnace slag, the sample pressing pressure is 12MPa, and the duration is 2min.
Example 3
The biomass electric furnace foaming agent comprises the following components in percentage by weight: 14% of coke powder, 70% of biomass hydrothermal carbon powder, 8% of semi-coke powder and 8% of limestone powder, wherein the particle sizes of the coke powder, the biomass hydrothermal carbon powder, the semi-coke powder and the limestone powder are all 200-18 meshes (0.075 mm-1 mm).
As shown in fig. 1, in the method for manufacturing the biomass electric furnace foaming agent of the embodiment, hydrothermal carbon powder, coke powder, blue carbon powder and limestone powder are placed in a mixing machine according to the weight percentage, stirred and mixed uniformly, the rotating speed of the mixing machine is 180r/min, the mixing time is 5min, and the mixing is repeated for 4 times; and then drying at 105 ℃ to obtain the electric furnace foaming agent. The hydrothermal carbon powder, the coke powder, the blue carbon powder and the limestone powder are crushed by a crusher, then are put into a crusher to be crushed, and are circularly crushed until the granularity reaches 200-18 meshes.
The biomass electric furnace foaming agent is mixed with electric furnace slag to be subjected to sample pressing treatment, and then the mixture is placed in a heating furnace to be subjected to electric furnace foaming application, wherein the foaming agent accounts for 5.5% of the balance weight of the electric furnace slag, the sample pressing pressure is 18MPa, and the duration is 4min.
Example 4
The biomass electric furnace foaming agent comprises the following components in percentage by weight: 7% of coke powder, 80% of biomass hydrothermal carbon powder, 7% of semi-coke powder and 6% of limestone powder, wherein the particle sizes of the coke powder, the biomass hydrothermal carbon powder, the semi-coke powder and the limestone powder are all 200-18 meshes (0.075 mm-1 mm).
As shown in fig. 1, in the method for manufacturing the biomass electric furnace foaming agent of the embodiment, hydrothermal carbon powder, coke powder, blue carbon powder and limestone powder are placed in a mixing machine according to the weight percentage, stirred and mixed uniformly, the rotating speed of the mixing machine is 350r/min, the mixing time is 3min, and the mixing is repeated for 5 times; then drying at 110 ℃ to obtain the electric furnace foaming agent. Wherein, the hydrothermal carbon powder, the coke powder, the blue carbon powder and the limestone powder are crushed by a crusher, then are put into a crusher for crushing, and are circularly crushed until the granularity reaches 200-18 meshes.
The biomass electric furnace foaming agent is mixed with electric furnace slag to be subjected to sample pressing treatment, and then the mixture is placed in a heating furnace to be subjected to electric furnace foaming application, wherein the foaming agent accounts for 4.5% of the balance weight of the electric furnace slag, the sample pressing pressure is 12MPa, and the duration is 3min.
Example 5
The biomass electric furnace foaming agent comprises the following components in percentage by weight: 1% of coke powder, 90% of biomass hydrothermal carbon powder, 5% of semi-coke powder and 4% of limestone powder, wherein the particle sizes of the coke powder, the biomass hydrothermal carbon powder, the semi-coke powder and the limestone powder are all 200-18 meshes (0.075 mm-1 mm).
As shown in fig. 1, in the method for manufacturing the biomass electric furnace foaming agent of the embodiment, hydrothermal carbon powder, coke powder, blue carbon powder and limestone powder are placed in a mixing machine according to the weight percentage, and are uniformly stirred and mixed, wherein the rotating speed of the mixing machine is 150r/min, the mixing time is 10min, and the mixing is repeated for 3 times; and then drying the mixture at 100 ℃ to obtain the electric furnace foaming agent. Wherein, the coke powder, the blue carbon powder and the limestone powder are crushed by a crusher, then are put into a crusher for crushing, and are circularly crushed until the granularity reaches 200-18 meshes.
The preparation process of the hydrothermal carbon powder comprises the following steps: putting the sawdust into a vacuum drying oven for drying for 12h to complete moisture removal, weighing a certain amount of sawdust and putting the sawdust into a reaction cup, adding water into the cup according to the proportion of 1; after the assembly is finished, introducing inert gas (nitrogen) into the kettle body from the gas inlet, discharging from the gas outlet, repeating for 4 times, and discharging air for 1min each time; an electromagnetic stirrer is arranged at the bottom of the reaction kettle, and the stirring speed is 300r/min; the experimental heating rate is 3.8 ℃/min, and the temperature is kept at 240 ℃ for 1.5h. After heat preservation is finished, the reaction kettle is cooled in a water bath to be rapidly cooled to room temperature, the gas outlet is slowly opened at the moment, after all gas is discharged, the reaction kettle is opened to take out the cup body, residues in the cup body are subjected to suction filtration and drying, and then the residues are crushed, and hydrothermal carbon with the granularity of 200-18 meshes (0.075 mm-1 mm) is screened out.
The biomass electric furnace foaming agent of the embodiment is mixed with electric furnace slag, then sample pressing treatment is carried out, and then the mixture is placed in a heating furnace for electric furnace foaming application, wherein the foaming agent accounts for 6% of the balance weight of the electric furnace slag, the sample pressing pressure is 12MPa, and the duration is 3min.
The results of the application of the foaming agent obtained in examples 1 to 5 in electric furnace foaming are shown in fig. 2 to 6, and it can be seen from the figures that the effect of increasing the foaming time and reducing the peak strength to some extent can be brought about as the proportion of the hydrothermal carbon increases and the proportion of the coke decreases, so that the foaming agent can be adapted to various requirements by regulating the weight ratio of different components.
In conclusion, the formula of the foaming agent can solve the problems that the foaming of the conventional foaming agent is incomplete and uneven due to a blowing method and the integral stable and durable foaming of slag is difficult to promote, and can also meet the requirements of electric furnace slag on foaming strength and foaming time.
Claims (7)
1. The preparation method of the biomass electric furnace foaming agent is characterized by comprising the following steps: uniformly mixing hydrothermal carbon powder, coke powder, blue carbon powder and limestone powder according to weight percentage, and then drying to obtain an electric furnace foaming agent; the mass percentages of the components are as follows: 1-30% of coke powder, 50-90% of biomass hydrothermal carbon powder, 5-10% of semi-coke powder and 4-10% of limestone powder, wherein the preparation process of the hydrothermal carbon powder comprises the following steps: mixing sawdust and water, placing the mixture in a reaction kettle for reaction, wherein the reaction temperature rise rate is 3.5-4.5 ℃/min, raising the temperature to 240-265 ℃, and keeping the temperature for 1-1.5 h; and cooling to room temperature after the reaction is finished, and performing suction filtration, drying, crushing and screening treatment on the reaction residue to obtain the hydrothermal carbon powder.
2. The method for preparing the biomass electric furnace foaming agent according to claim 1, is characterized in that: the particle sizes of the coke powder, the biomass hydrothermal carbon powder, the blue carbon powder and the limestone powder are all 200-18 meshes.
3. The method for preparing the biomass electric furnace foaming agent according to claim 1, is characterized in that: before the reaction, introducing inert gas into the kettle body through the gas inlet, discharging the inert gas from the gas outlet, repeating the reaction for 3 to 5 times, and discharging the inert gas for 1 to 2min each time to remove air; and after the heat preservation reaction is finished, carrying out water bath cooling on the reaction kettle, opening a gas outlet of the reaction kettle after the temperature is reduced, and taking out a reaction product after all gas is discharged.
4. The method for manufacturing the biomass electric furnace foaming agent according to any one of claims 1 to 3, characterized in that: placing the hydrothermal carbon powder, the coke powder, the blue carbon powder and the limestone powder into a powder mixer, stirring and mixing, wherein the rotation speed of the powder mixer is 150 r/min-350 r/min; the mixing time is 3min to 10min, and the mixing is repeated for 3 to 5 times.
5. The method for preparing the biomass electric furnace foaming agent according to claim 4, characterized in that: the components are evenly mixed and then are dried at the temperature of 100-110 ℃.
6. The application method of the biomass electric furnace foaming agent prepared by the method of any one of claims 1 to 5 is characterized in that: and mixing the biomass electric furnace foaming agent and the electric furnace slag, then carrying out sample pressing treatment, and then placing the mixture in a heating furnace for heating.
7. The application method of the biomass electric furnace foaming agent according to claim 6, is characterized in that: the foaming agent accounts for 4.5-6% of the balance weight of the electric furnace slag, the sample pressing pressure is 12-18 MPa, and the duration is 2-4 min.
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| CN111978970A (en) * | 2020-07-23 | 2020-11-24 | 北京科技大学 | Method for preparing coking raw material by biomass hydrothermal carbonization treatment and application of method in coking production |
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2022
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| US5395420A (en) * | 1993-11-30 | 1995-03-07 | Centro Sviluppo Materiali S.P.A. | Process for using foamed slag in stainless steel production |
| US6793708B1 (en) * | 2001-10-16 | 2004-09-21 | Jeremy A. T. Jones | Slag composition |
| CA2519728A1 (en) * | 2003-05-24 | 2004-12-02 | Sms Demag Aktiengesellschaft | Method for producing foamed slag on high-chromium melts in an electric furnace |
| CN103993131A (en) * | 2013-02-19 | 2014-08-20 | 宝山钢铁股份有限公司 | Method for making foamed slag during stainless steel electric furnace smelting |
| CN109504817A (en) * | 2018-12-29 | 2019-03-22 | 上海盛宝冶金科技有限公司 | A kind of electric furnace foaming agent and production method |
| CN111978970A (en) * | 2020-07-23 | 2020-11-24 | 北京科技大学 | Method for preparing coking raw material by biomass hydrothermal carbonization treatment and application of method in coking production |
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