CN114414569B - Electric furnace slag foaming performance evaluation method - Google Patents
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- 238000005187 foaming Methods 0.000 title claims abstract description 179
- 239000002893 slag Substances 0.000 title claims abstract description 161
- 238000011156 evaluation Methods 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 claims abstract description 31
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 239000006260 foam Substances 0.000 claims abstract description 4
- 239000004088 foaming agent Substances 0.000 claims description 27
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 20
- 238000003825 pressing Methods 0.000 claims description 15
- 238000002474 experimental method Methods 0.000 claims description 13
- 238000002844 melting Methods 0.000 claims description 11
- 230000008018 melting Effects 0.000 claims description 11
- 229910052786 argon Inorganic materials 0.000 claims description 10
- 239000010431 corundum Substances 0.000 claims description 8
- 229910052593 corundum Inorganic materials 0.000 claims description 8
- 239000008188 pellet Substances 0.000 claims description 8
- 238000004364 calculation method Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 5
- 239000003153 chemical reaction reagent Substances 0.000 claims description 4
- 238000003860 storage Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 239000010453 quartz Substances 0.000 claims description 2
- 230000000630 rising effect Effects 0.000 claims description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 description 10
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 238000011160 research Methods 0.000 description 4
- 238000003723 Smelting Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000010309 melting process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 229910052582 BN Inorganic materials 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000011158 quantitative evaluation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/38—Diluting, dispersing or mixing samples
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Abstract
The invention discloses an electric furnace slag foaming performance evaluation method, and belongs to the technical field of electric furnace slag performance evaluation. The invention relates to an electric furnace slag foaming performance evaluation method, which comprises the following steps: respectively placing each group of samples to be foamed into a heating furnace for heating to foam electric furnace slag, and shooting dynamic changes in the foaming process of the samples to be foamed through a camera device; the pictures obtained by shooting are processed, the foaming sectional areas of the electric furnace slag at different shooting moments are calculated, a foaming behavior curve is drawn, the foaming area and the average relative area strength of the electric furnace slag are calculated, and the foaming performance of the electric furnace slag is evaluated by the parameters. According to the invention, factors such as the foaming area ratio strength, the foaming time and the like are integrated, related foaming characteristic parameters are formulated to evaluate the foaming performance of the electric furnace slag, the evaluation accuracy is effectively improved, and the interference of external factor changes on the evaluation result can be avoided.
Description
Technical Field
The invention belongs to the technical field of electric furnace slag foaming performance evaluation, and particularly relates to an electric furnace slag foaming performance evaluation method.
Background
In electric furnace smelting, foaming slag is generated in order to smelt high-quality steel and meet the requirements of special steel, economic benefit, environmental protection, energy conservation and the like, and foaming agent is required to be added in the smelting of the foaming slag. For the same slag, the foaming effects brought by different foaming agents are different, and how to evaluate the foaming effect of the electric slag becomes one of the keys for determining the foaming influence of the foaming agents.
At present, there are many reports and papers about the evaluation and research of the foaming performance of the electric furnace slag, but no comprehensive evaluation mode exists. In the laboratory research stage, when a researcher evaluates the foaming performance of the electric slag after a certain foaming agent is added, a liquid experiment is often adopted, and the liquid experiment particularly comprises two parts of experimental measurement and theoretical calculation, namely, the initial liquid level is recorded in a pipe, a steel rod is inserted into the pipe at fixed time intervals, the liquid level is recorded, the foaming starting moment is recorded through naked eyes to obtain the foaming time, and the foaming performance of the electric slag after a certain foaming agent is added is evaluated according to the foaming height and the foaming time of the foaming slag, wherein the evaluation mode is called a height method for short. For example, wu Zhenting et al, university of northeast, analyzed the effect of various factors on slag foaming using the foaming height of the slag as an indicator, and evaluated the foaming capacity of the slag (Special steel, 1993 (5): 34-38); the research of a stainless steel fluorine-free electric furnace slag foaming agent (Shanghai university) was also conducted by using the foaming height of the electric furnace slag as an index of Meng Qingyu at Shanghai university.
In view of the particularity of the foaming of the electric furnace slag, the foaming time is one of the indexes which are indispensable in performance evaluation, and the importance of the foaming time in the performance evaluation of the foaming agent is confirmed by a height method, so that the foaming time has certain reference significance. However, the foaming performance of the electric furnace slag is evaluated according to the foaming time and the foaming height so that the electric furnace slag is too thin, if the electric furnace slag is evaluated in a single dimension, for example, the performance evaluation of a certain electric furnace slag is respectively finished through the foaming time and the foaming height or the two are independently used as evaluation indexes to finish the comparison of the foaming performance of the electric furnace slag matched with different foaming agents, the basis of the evaluation mode is too thin, and theoretical support cannot be provided for subsequent research; the foaming performance of the electric furnace slag is evaluated in two dimensions by combining the foaming time and the foaming height, and the relation between the foaming height and the foaming time is integrated, but the foaming height as a single-dimensional parameter has larger contingency, the accuracy cannot be ensured, and the performance evaluation significance cannot be still used as a strong theoretical support for subsequent experimental study; meanwhile, the manual measurement of the height of molten steel has larger error when observing the foaming starting moment, and the influence of external factor interference on the evaluation result cannot be avoided.
Disclosure of Invention
1. Problems to be solved
The invention aims to overcome the defects that the conventional electric furnace slag foaming performance evaluation method is thin in evaluation basis and relatively poor in accuracy, and is particularly easy to be interfered by external factors, and provides an electric furnace slag foaming performance evaluation method. The invention integrates the factors such as the foaming area ratio strength, the foaming time and the like, and formulates relevant foaming characteristic parameters to evaluate the foaming capacity of the electric furnace slag, thereby effectively improving the accuracy of evaluation, avoiding the interference of external factor changes on the evaluation result, and contributing to the industrial application of the foaming agent.
2. Technical proposal
In order to solve the problems, the technical scheme adopted by the invention is as follows:
the invention relates to a method for evaluating foaming performance of electric furnace slag, which comprises the following steps:
step one, pretreatment of electric furnace slag
Taking slag synthesized by chemical pure reagent as a sample source of the electric furnace slag to be foamed, and carrying out pre-melting treatment on the chemical synthesized slag to form a slag phase;
step two, mixing and pressing samples
Mixing the slag phase obtained after the pre-melting treatment with different foaming agents, and carrying out sample pressing treatment on each group of mixed materials to obtain a sample to be foamed;
step three, sample foaming
Respectively placing each group of samples to be foamed into a heating furnace for heating to foam electric furnace slag, and shooting dynamic changes in the foaming process of the samples to be foamed through a camera device;
step four, image processing and foaming property evaluation
The pictures obtained by shooting are processed, the foaming sectional areas of the electric furnace slag at different shooting moments are calculated, the electric furnace slag is contracted to the minimum sectional area as a reference, the instantaneous sectional areas are compared with the minimum sectional area, a change curve of the foaming sectional area ratio (the ratio of the instantaneous foaming sectional area to the minimum foaming sectional area) of the electric furnace slag along with the foaming time, namely, a foaming behavior curve is drawn, so that the foaming area and average relative area strength of the electric furnace slag are calculated, and the foaming performance of the electric furnace slag is evaluated by the parameters.
Further, the temperature of the premelting treatment in the first step is 1550-1650 ℃, the temperature of the electric furnace slag is increased along with the furnace, and the temperature rising speed is 10-15 ℃/s.
Further, in the first step, after the sample is melted, the temperature is reduced along with the furnace, and the sample is crushed to the target granularity of 200-18 meshes.
Furthermore, the addition amount of various foaming agents in the second step accounts for 3.5-5.5% of the balance weight of the electric furnace slag, the pressure of sample pressing treatment is 12-17MPa, and the time is 3-5min; after sample pressing, the sample to be foamed is placed at 100-120 ℃ for heat preservation for 20-24 hours to remove water.
In the third step, each group of samples to be foamed is respectively placed in a heating furnace through a corundum tube, and argon is introduced into the tube for 3-6 min at 1-2L/min before the experiment is started so as to exhaust air; the experimental temperature is controlled to 1500-1600 ℃, and the argon flow is closed in the experimental process.
Further, an air inlet pipe and an air outlet pipe are respectively arranged on the corundum pipe, and the other end of the air inlet pipe is connected with an argon storage tank; one end of the corundum tube is provided with an observation window, the observation window is made of quartz, and the camera shooting equipment shoots and records the foaming process of the electric furnace slag through the observation window.
Further, the foaming area S and average surface area strength of the electric furnace slagThe calculation formulas are respectively as follows:
in the above, T 1 And T 3 The start time and the end time of slag foaming are respectively, and deltaa is the change rate of the instantaneous foaming area ratio of the electric slag.
Further, the foaming initiation time T 1 The foaming termination time T is the time point when the initial area ratio of the electric furnace slag is minimum, namely the time point corresponding to the time point when the slag pellets shrink to the minimum sectional area 3 The foaming behavior curve is the time point with the same cross-sectional area ratio corresponding to the foaming starting time.
Still further, the image pickup apparatus captures images every 10-20 s.
3. Advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
(1) According to the electric furnace slag foaming performance evaluation method, factors such as the foaming area ratio strength, the foaming time and the like are comprehensively considered, and relevant foaming characteristic parameters (the foaming area and the average relative area strength of the electric furnace slag) are formulated to evaluate the foaming capacity of the electric furnace slag, so that the evaluation accuracy of the foaming performance of the electric furnace slag is effectively improved; meanwhile, through optimization of processes such as premelting treatment, sample pressing treatment and the like of the electric furnace slag, interference of external factor changes on an evaluation result can be effectively avoided.
(2) According to the electric furnace slag foaming performance evaluation method, when the foaming agent interacts with the electric furnace slag, the foaming degree of the electric furnace slag is not only influenced by the performance of the foaming agent, but also influence on the foaming strength of the electric furnace slag due to external factors such as gas atmosphere, alkalinity and porosity of the slag. Therefore, in the method, inert gas is introduced into the heating furnace to ensure gas atmosphere, meanwhile, the alkalinity of the electric furnace slag synthesized by the chemical reagent is controlled, and porosity interference is eliminated through briquetting treatment, so that interference of the factors on an evaluation result is eliminated. The pre-melting treatment of the electric furnace slag is helpful for weakening the foaming effect of the electric furnace slag, so that the foaming performance of the electric furnace slag after the foaming agent is mixed is amplified on the same standard, and the electric furnace slag is easier to observe and compare.
(3) According to the electric furnace slag foaming performance evaluation method, after the foaming images of the slag at different moments are obtained through shooting, the foaming sectional area of the electric furnace slag is obtained through calculation by special computer software, so that the artificial error of a height method is avoided, and the accuracy of the foaming agent performance evaluation is further improved.
(4) According to the electric furnace slag foaming performance evaluation method, the moment when the area of slag is minimum in the initial foaming stage, namely the moment when the cylindrical pellets of slag shrink to the minimum sectional area, is taken as the initial foaming time, so that the influence of the self-melting process of the foaming agent on the foaming performance evaluation of the foaming agent can be effectively avoided, and the accuracy of the evaluation result is further ensured.
Drawings
FIG. 1 is a schematic diagram of a test and evaluation apparatus used in the present invention;
FIG. 2 is a schematic diagram of an evaluation curve of foaming performance of the electric furnace slag obtained by the invention;
FIG. 3 is a graph comparing foaming curves of the slag in pre-melting and non-pre-melting samples;
FIG. 4 is a graph showing the comparison of bubbling curves of the slag in sample preparation of briquettes and non-briquettes;
FIG. 5 is a graph comparing area ratio strength of no pretreatment slag after addition of a foaming agent;
FIG. 6 is a graph comparing the area ratio strength of pretreated slag after addition of a foaming agent;
in the figure: 1. a heating furnace; 2. a corundum tube; 301. an air inlet pipe; 302. an air outlet pipe; 4. a gasket; 5. a sample to be foamed; 6. an observation window; 7. an image pickup apparatus; 8. a control panel; 9. and an argon storage tank.
Detailed Description
Aiming at the problem that the existing electric furnace slag foaming performance evaluation method (height method) is relatively poor in evaluation accuracy, the invention provides the electric furnace slag foaming performance evaluation method, which integrates factors such as foaming area ratio strength, foaming time and the like, and makes relevant foaming characteristic parameters to evaluate the foaming performance of the electric furnace slag (area ratio method for short), breaks through a liquid experiment of conventional thinking, and realizes qualitative to quantitative evaluation conversion. Meanwhile, the invention carries out an amplification experiment on the foaming of the electric furnace slag in a solid state experiment mode, and a block-shaped sample in the vacuum tube furnace is equivalent to one bubble of a plurality of foaming slag in the electric arc furnace, so that the foaming experiment is more visual; and the foaming performance of the electric furnace slag is evaluated by the area ratio method and the time intersection, so that the reliability of the result is ensured, and compared with a height method, the accidental existence in the process is greatly reduced.
The scheme of the invention is further described below with reference to specific examples.
Example 1
The electric furnace slag foaming performance evaluation method of the embodiment comprises the following steps:
step one, pretreatment of electric furnace slag
The slag synthesized by the chemical pure reagent is used as a sample source of the electric furnace slag to be foamed, the component content of the slag is shown in table 1 (binary alkalinity is 2.39), and the slag phase is formed by pre-melting the chemical synthetic slag in the sample preparation stage before the experiment starts, so that the self foaming effect of the electric furnace slag is weakened, the foaming performance of the electric furnace slag after the foaming agent is amplified on the same standard, and the electric furnace slag is easier to observe and compare.
TABLE 1 electric furnace slag composition and composition ratio
Specifically, in this embodiment, the premelting operation is performed in an electromagnetic induction heating furnace at 1600 ℃, the temperature is raised along with the furnace at a temperature raising speed of 13 ℃/s, then the temperature is lowered along with the furnace, the crucible is taken out after the crucible is cooled to room temperature, and the crucible is crushed by an electromagnetic crusher to achieve a target granularity of 200-18 meshes (0.075-1 mm).
Step two, mixing and pressing samples
Mixing the slag phase obtained after the pre-melting treatment with different foaming agents, and carrying out sample pressing treatment on each group of mixed materials to obtain a sample 5 to be foamed; the mass of the electric furnace slag in each sample is 1g (+ -0.01), the foaming agent accounts for 5% of the weight of the electric furnace slag, the appearance of the samples is cylindrical (h=10 mm, d=5 mm), the pressure P of the sample pressing treatment is=15 MPa, the time t=3 min, and each group of samples are placed in a 105 ℃ vacuum drying oven for heat preservation for 24h after the completion of briquetting so as to remove water.
The pressure control of the sample pressing treatment has a great influence on the evaluation result, the excessive pressure can lead the block not to be formed, the smaller pressure can lead the porosity to be increased, the air in the block sample is easy to exist in the process of pressing the block, and the subsequent evaluation result is influenced; the briquetting is carried out under certain pressure and duration, which is helpful for escaping air, reducing porosity, eliminating interference and ensuring the accuracy of the evaluation result.
Step three, sample foaming
As shown in fig. 1, before the experiment was started, argon was introduced into the corundum tube 2 (on which an air inlet tube 301 and an air outlet tube 302 were provided, respectively, and the other end of the air inlet tube 301 was connected to the argon storage tank 9) at 2L/min for 3min to evacuate air. The dried sample was placed on a boron nitride spacer 4 (a=40 mm, b=40 mm, h=4 mm), pushed into the high temperature zone of the heating furnace 1 (che-1700 vacuum tube furnace in this example, the heating temperature and other parameters can be set by the control panel 8) at 1550 ℃, and the argon flow was turned off. The imaging device 7 shoots dynamic changes in the foaming process of the sample to be foamed through the observation window 6.
Step four, image processing and foaming property evaluation
Processing the shot pictures, calculating by special mapping software to obtain foaming sectional areas of the electric furnace slag at different shooting moments, and performing T-joint 1 The minimum sectional area of the electric furnace slag at the moment is compared, a change curve of the foaming sectional area ratio of the electric furnace slag along with the foaming time, namely a foaming behavior curve (shown in figure 2) is drawn, so that the foaming area and the average relative area strength of the electric furnace slag are calculated, and the foaming of different foaming agents is carried out according to the parametersThe foam performance was evaluated.
Specifically, as shown in FIG. 2, A 1 Is the point of the minimum area ratio at the initial stage of foaming, thus A 1 The abscissa T corresponding to the point 1 Defined as the point in time at which the slag melting period ends and foaming begins; a is that 2 Is the point where the area ratio (volume expansion) of the slag is the greatest during the entire foaming period, thus A 2 The abscissa T corresponding to the point 2 Defined as the point in time of the slag foaming peak; at A 1 The point is a straight line parallel to the time axis, and the straight line intersects with the foaming behavior curve at A 3 Point, here A 3 The abscissa T corresponding to the point 3 Defined as the end point of slag foaming, i.e. T 2 -T 1 T is the time required for the slag to start foaming to a foaming peak 3 -T 1 For the duration of slag foaming. Δy is A 2 Point ordinate and A 1 Difference in ordinate of points, i.e. T 2 Cross-sectional area at time and T 1 The difference in cross-sectional area at the moment is therefore defined as deltay, the maximum height of slag foaming. S is A 1 -A 3 The integral area between the line segment and the foaming behavior curve is shown as a formula 1-1, the average foaming area formula 1-2 can be obtained from the formula 1-1, and the foaming characteristic parameter is used for measuring the comprehensive condition of slag foaming.
In order to quantitatively analyze the volume change of slag in the foaming process, an image area calculation method is adopted to conduct quantitative study on foaming behavior, and specifically, the measurement and calculation of the instantaneous area of slag pellets in a shooting area are conducted. In the present study, the minimum area of the cylindrical pellets of slag is defined as the initial time for the formal start of the foaming experiment, and therefore, the minimum area of the cylindrical pellets of slag is also defined as the minimum area of the cylindrical pellets of slag (T 1 ) Cross-sectional area (S) 1 ) Taking the reference, capturing images every 10S, and measuring the instantaneous areas of the slag at different moments in the whole foaming experiment process (S t ) Dividing the two area values to obtain an area ratio (S t /S 1 ) I.e. the instantaneous area divided by the area of the cylindrical pellets of slag contracted to a minimum cross-sectional area. And drawing the area ratio into a curve changing with time, and obtaining a foaming behavior curve graph of the slag.
It should be noted that the purpose of the foaming of the electric slag is to obtain an effect of smooth foaming and long foaming time to assist smelting, and the foaming of the electric slag at a high temperature may have an influence on the evaluation result because of the self-melting process existing before the foaming of the electric slag. Therefore, the melting process of the electric slag is considered in the application, and the moment when the electric slag is contracted to the minimum area in the initial stage of foaming is taken as the foaming starting time, so that the accuracy of the foaming performance evaluation of the electric slag is further ensured.
In summary, the method comprehensively considers the strength and duration of slag foaming, prepares to exclude unnecessary interference factors through related experiments, analyzes characteristic points of a slag foaming behavior curve, and calculates the foaming area S and the average relative area strength by the formulas 1-1 and 1-2And determining the foaming performance of the electric furnace slag. To verify the benefits of the related operations of the present invention, several curves are provided, as shown in the figures, notably, the curves are not indicative of the shrinkage process for reasons set forth above]. As can be seen from fig. 3 and 4, the pre-melting and sample pressing operations can effectively reduce the foaming effect of the electric furnace slag, and fig. 5 and 6 can show that after pretreatment, the influence of the foaming effect of the electric furnace slag on the performance evaluation of the electric furnace slag after the foaming agent is mixed is reduced, and the performance effect of the foaming agent is amplified on the same standard, so that the electric furnace slag foaming device is more visual and more accurate.
Claims (7)
1. A foaming performance evaluation method of electric furnace slag is characterized in that: the method comprises the following steps:
step one, pretreatment of electric furnace slag
Taking slag synthesized by chemical pure reagent as a sample source of the electric furnace slag to be foamed, and carrying out pre-melting treatment on the chemical synthesized slag to form a slag phase;
step two, mixing and pressing samples
Mixing the slag phase obtained after the pre-melting treatment with different foaming agents, and carrying out sample pressing treatment on each group of mixed materials to obtain a sample to be foamed;
step three, sample foaming
Each group of samples to be foamed are respectively placed in a heating furnace (1) to be heated so as to foam electric furnace slag, and dynamic changes in the foaming process of the samples to be foamed (5) are shot through a camera device (7);
step four, image processing and foaming property evaluation
Processing the shot pictures, calculating to obtain foaming sectional areas of the electric furnace slag at different shooting moments, drawing a change curve of the foaming sectional area ratio of the electric furnace slag along with the foaming time, namely a foaming behavior curve, by comparing the foaming sectional areas with the minimum sectional areas of the electric furnace slag, and calculating to obtain the foaming area and average relative area strength of the electric furnace slag, and evaluating the foaming performance of different electric furnace slag according to the obtained foaming area and average relative area strength; wherein the foaming area S and average area strength of the electric furnace slagThe calculation formulas are respectively as follows:
in the above, T 1 And T 3 Respectively the starting time and the ending time of slag foaming, the foaming starting time T 1 At the point in time when the initial area ratio of foaming is the smallest,namely, the time point corresponding to the time point when the slag pellets shrink to the minimum sectional area, the foaming termination time T 3 For the same time point of the foaming behavior curve as the cross-sectional area ratio corresponding to the foaming start time, Δa is the rate of change of the instantaneous foaming area ratio of the electric furnace slag.
2. The method for evaluating foaming property of electric furnace slag according to claim 1, wherein: the temperature of the premelting treatment in the first step is 1550-1650 ℃, the temperature of the electric furnace slag is increased along with the furnace, and the temperature rising speed is 10-15 ℃/s.
3. The method for evaluating foaming property of electric furnace slag according to claim 2, wherein: and in the first step, after the sample is melted, cooling along with a furnace, and crushing to the target granularity of 200-18 meshes.
4. The method for evaluating foaming property of electric furnace slag according to claim 1, wherein: the addition amount of various foaming agents in the second step accounts for 3.5-5.5% of the balance weight of the electric furnace slag, the pressure of sample pressing treatment is 12-17MPa, and the time is 3-5min; after sample pressing, the sample (5) to be foamed is placed at 100-120 ℃ for heat preservation for 20-24 hours to remove water.
5. The method for evaluating foaming property of electric furnace slag according to claim 1, wherein: step three, placing each group of samples to be foamed into a heating furnace through a corundum tube (2), and introducing argon into the tube for 3-6 min at a speed of 1-2L/min before the experiment starts so as to exhaust air; the experimental temperature is controlled to 1500-1600 ℃, and the argon flow is closed in the experimental process.
6. The method for evaluating foaming property of electric furnace slag according to claim 5, wherein: an air inlet pipe (301) and an air outlet pipe (302) are respectively arranged on the corundum pipe (2), and the other end of the air inlet pipe (301) is connected with an argon storage tank (9); one end of the corundum tube (2) is provided with an observation window (6), the observation window (6) is made of quartz, and the camera equipment (7) shoots and records the foaming process of the slag through the observation window (6).
7. The method for evaluating foaming property of electric furnace slag according to any one of claims 1 to 6, wherein: the image pickup device (7) captures images every 10-20 s.
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| CN202210025180.3A CN114414569B (en) | 2022-01-11 | 2022-01-11 | Electric furnace slag foaming performance evaluation method |
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| CN114414569B true CN114414569B (en) | 2024-01-30 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1392414A (en) * | 2002-02-01 | 2003-01-22 | 北京科技大学 | Method for analyzing and studying high temperature foaming of metallurgical cinder |
| CN110020654A (en) * | 2019-04-08 | 2019-07-16 | 中南大学 | The recognition methods of foamed zones in expansion fire-proof layer of charcoal SEM image |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20070133651A1 (en) * | 2005-12-14 | 2007-06-14 | Gerhan Ronald E | Method for controlling foaming of slag in an electric arc furnace |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1392414A (en) * | 2002-02-01 | 2003-01-22 | 北京科技大学 | Method for analyzing and studying high temperature foaming of metallurgical cinder |
| CN110020654A (en) * | 2019-04-08 | 2019-07-16 | 中南大学 | The recognition methods of foamed zones in expansion fire-proof layer of charcoal SEM image |
Non-Patent Citations (3)
| Title |
|---|
| LF精炼渣发泡性能研究;谢兵 等;《炼钢》;第19卷(第5期);第52-56页 * |
| 合成渣中碳还原高炉粉尘的发泡特性参数;吴铿 等;《过程工程学报》;第1卷(第3期);第268-271页 * |
| 精炼渣发泡性能的实验研究 和渣发泡条件的理论分析;乐可襄 等;《钢铁》;第33卷(第7期);第18-21页 * |
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