Method for secondarily utilizing ash cone tray for blast furnace slag melting point test in laboratory

Abstract

The invention discloses a method for secondarily utilizing an ash cone tray for a blast furnace slag melting point test in a laboratory, and belongs to the technical field of blast furnace slag basic characteristic detection. Comprising the following steps: fully grinding a proper amount of ash sample; fully blending the dextrin solution with the ash sample; preparing an ash cone, and air-drying the ash cone on glass; putting the ash cone into a triangular groove of a tray, and putting the tray on a corundum boat of a heating furnace; slowly pushing the corundum boat into the furnace body, turning on a power supply of a test instrument, and recording the deformation temperature DT, the hemisphere temperature HT and the flowing temperature FT of the ash cone in detail; naturally cooling the ash cone tray in the furnace to room temperature; the tray is reversely placed in a corundum boat, a corundum material receiving disc is placed under the tray, the temperature is increased and kept for a certain time, after liquid in the tray completely falls off to the material receiving disc, the tray is cooled and waits to be cooled to the room temperature, and the tray can be reused. The invention aims to avoid waste and save cost. And meanwhile, the process requirement of secondary recycling is met.

Description

Technical Field

[0001] This invention belongs to the field of basic characteristic testing technology of blast furnace slag, and particularly relates to a method for secondary use of ash cone trays for blast furnace slag melting point testing in the laboratory. Background Technology

[0002] Blast furnace slag is a byproduct of blast furnace smelting, composed of gangue from the ore, ash from the fuel, and flux. The melting point of blast furnace slag is crucial for efficient and stable blast furnace production. An excessively high melting point can lead to difficulties in slag removal and deterioration of furnace conditions, while an excessively low melting point may exacerbate furnace lining erosion or increase energy consumption during the smelting process. By precisely controlling the slag composition through experiments (such as adjusting the CaO / SiO2 ratio or adding flux), its fluidity and operating temperature range can be optimized, thereby reducing coke consumption and carbon emissions, and improving desulfurization efficiency.

[0003] In laboratory blast furnace slag melting point experiments, the trays holding the samples are usually discarded after the test, resulting in a waste of experimental equipment. Therefore, there is an urgent need to propose a new method for the secondary recycling and reuse of ash cone trays used in blast furnace slag melting point tests. Summary of the Invention

[0004] The purpose of this invention is to provide a method for the secondary use of ash cone trays for blast furnace slag melting point testing in the laboratory, which avoids waste and saves costs; at the same time, it meets the process requirements for secondary recycling.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] The present invention discloses a method for secondary use of a ash cone tray for laboratory blast furnace slag melting point testing, comprising the following steps:

[0007] (1) Prepare ash samples from the slag sent from the ironworks by the slow ash method in industrial analysis, take an appropriate amount of ash samples and grind them thoroughly with an agate grinding body.

[0008] (2) Dissolve dextrin in distilled water to obtain a solution, and then use the solution to fully mix with the ash sample prepared in step (1); use an ash cone template and a knife to make an ash cone from the mixture of sample and dextrin in step (1), and air dry it on glass;

[0009] (3) Place the ash cone from step (2) into the triangular groove of the tray and place it on the corundum boat of the heating furnace;

[0010] (4) Slowly push the corundum boat into the furnace, turn on the power of the testing instrument and record the deformation temperature DT, hemispherical temperature HT and flow temperature FT of the ash cone in detail.

[0011] (5) After the test is completed, turn off the power and let the ash cone tray cool naturally to room temperature in the furnace;

[0012] (6) Place the tray from step (5) upside down inside the corundum boat and place a corundum receiving tray directly below it. Heat the tray to 1300-1500℃ and maintain it for a certain period of time. After the liquid in the tray has completely fallen into the receiving tray, cool it down and wait for the tray to cool to room temperature. The tray can be reused.

[0013] Furthermore, in step (1), at least 35 grams of ash sample are taken.

[0014] Furthermore, in step (2), 5g of dextrin is dissolved in 100ml of distilled water.

[0015] Furthermore, 12 drops of this solution are thoroughly mixed with the ash sample prepared in step (1).

[0016] Furthermore, in step (5), the temperature is raised to 1400°C.

[0017] Furthermore, maintain for 1 minute.

[0018] Furthermore, the deformation temperature of the recycled pallet was measured in a secondary test with a range of less than 3℃ from the first test, the hemispherical temperature was less than 2℃, and the flow temperature was less than 2℃, which met the error range and achieved the process requirements for secondary recycling.

[0019] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0020] This invention recycles trays used in laboratory slag melting point tests, allowing for their reuse without affecting the accuracy of the secondary tests. The recycled trays, when tested in the secondary tests, showed deformation temperatures within a 3°C range, hemispherical temperatures within a 2°C range, and flow temperatures within a 2°C range, meeting the error limits and achieving the process requirements for secondary recycling. Detailed Implementation

[0021] The technical solution of the present invention will be described in detail below with reference to the embodiments.

[0022] This invention uses two different blast furnace slags from Baotou Steel to conduct melting point tests. The chemical composition of slag #1, by mass percentage, includes: 29.98% CaO, 27.94% SiO2, 8.81% Al2O3, 4.89% TFe, 5.45% MgO, 1.05% S, and 0.49% K2O; the chemical composition of slag #2, by mass percentage, includes: 37.48% CaO, 27.47% SiO2, 11.10% Al2O3, 0.05% TFe, 7.81% MgO, 1.13% S, and 0.48% K2O.

[0023] Example 1

[0024] The No. 1 slag was formed into an ash cone and placed on a new triangular groove in a tray. The tray was then placed on a corundum boat and gently pushed into the furnace. The power was turned on to the testing instrument, and the deformation temperature (DT), hemispherical temperature (HT), and flow temperature (FT) of the ash cone were recorded in detail. After the test, the furnace was allowed to cool to room temperature. The tray was then placed upside down in the corundum boat, heated to 1400℃ and held for 1 minute. After the liquid in the tray completely detached into the receiving tray, it was cooled to room temperature and removed. The No. 1 slag sample was then formed into an ash cone and placed on the triangular groove of the recycling tray. The deformation temperature (DT), hemispherical temperature (HT), and flow temperature (FT) of the ash cone were tested. After the test, the furnace bottom was allowed to cool to room temperature and removed. The test data are shown in Table 1. It can be seen that the present invention effectively recycles the tray, and the test data fully meets the requirements.

[0025] Table 11# Slag Deformation Temperature, Hemispherical Temperature, and Flow Temperature under Different Tray Conditions

[0026]

[0027]

[0028] Example 2

[0029] The No. 2 slag was formed into an ash cone and placed on a new triangular groove in a tray. The tray was then placed on a corundum boat and gently pushed into the furnace. The power was turned on to the testing instrument, and the deformation temperature (DT), hemispherical temperature (HT), and flow temperature (FT) of the ash cone were recorded in detail. After the test, the furnace was allowed to cool to room temperature. The tray was then placed upside down in the corundum boat, heated to 1400℃ and held for 1 minute. After the liquid in the tray completely detached into the receiving tray, it was cooled to room temperature and removed. The No. 2 slag sample was then formed into an ash cone and placed on the triangular groove of the recycling tray. The deformation temperature (DT), hemispherical temperature (HT), and flow temperature (FT) of the ash cone were tested. After the test, the furnace bottom was allowed to cool to room temperature and removed. The test data are shown in Table 2. It can be seen that the present invention effectively recycles the tray, and the test data fully meets the requirements.

[0030] Table 22# Slag Deformation Temperature, Hemispherical Temperature, and Flow Temperature under Different Tray Conditions

[0031]

[0032] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A method for the secondary use of a cone tray for testing the melting point of blast furnace slag in a laboratory, characterized in that, Includes the following steps: (1) Prepare ash samples from the slag sent from the ironworks by the slow ash method in industrial analysis, take an appropriate amount of ash samples and grind them thoroughly with an agate grinding body. (2) Dissolve dextrin in distilled water to obtain a solution, and then use the solution to fully mix with the ash sample prepared in step (1); use an ash cone template and a knife to make an ash cone from the mixture of sample and dextrin in step (1), and air dry it on glass; (3) Place the ash cone from step (2) into the triangular groove of the tray and place it on the corundum boat of the heating furnace; (4) Slowly push the corundum boat into the furnace, turn on the power of the testing instrument and record the deformation temperature DT, hemispherical temperature HT and flow temperature FT of the ash cone in detail. (5) After the test is completed, turn off the power and let the ash cone tray cool naturally to room temperature in the furnace; (6) Place the tray from step (5) upside down inside the corundum boat and place a corundum receiving tray directly below it. Heat the tray to 1300-1500℃ and maintain it for a certain period of time. After the liquid in the tray has completely fallen into the receiving tray, cool it down and wait for the tray to cool to room temperature. The tray can be reused.

2. The method for secondary utilization of blast furnace slag melting point test ash cone tray in the laboratory according to claim 1, characterized in that, In step (1), at least 35 grams of ash sample shall be taken.

3. The method for secondary utilization of blast furnace slag melting point test ash cone tray in the laboratory according to claim 1, characterized in that, In step (2), 5g of dextrin is dissolved in 100ml of distilled water.

4. The method for secondary utilization of blast furnace slag melting point test ash cone tray in the laboratory according to claim 3, characterized in that, Mix 12 drops of this solution thoroughly with the ash sample prepared in step (1).

5. The method for secondary utilization of blast furnace slag melting point test ash cone tray in the laboratory according to claim 1, characterized in that, In step (5), the temperature is raised to 1400℃.

6. The method for secondary utilization of blast furnace slag melting point test ash cone tray in the laboratory according to claim 5, characterized in that, Hold for 1 minute.

7. The method for secondary utilization of blast furnace slag melting point test ash cone tray in the laboratory according to claim 1, characterized in that, The deformation temperature of the recycled pallet was measured in a secondary test with a range of less than 3℃ from the first test, the hemispherical temperature was less than 2℃, and the flow temperature was less than 2℃, which met the error range and achieved the process requirements for secondary recycling.

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