Slag-iron separating agent for hot-metal bottle

Abstract

The invention provides a slag-iron separating agent for a hot-metal bottle. The slag-iron separating agent comprises the following components in percentage by weight: high-aluminum aggregate powder, quartz sand powder, silica powder, flake graphite powder, zircon sand powder, organic bentonite, liquid aluminum dihydrogen phosphate, water and fluorite powder. The slag-iron separating agent disclosed by the invention is obvious in slagging and crusting effect, high in spraying adhesion rate, high in high temperature resistance and high in smoke scouring resistance, and a compact protective layer is formed on the walls of a converter cover and a smoke flue water-cooling pipe after spraying, so that slag steel is effectively isolated, and it is practically guaranteed that blanking ports on the two sides are not subjected to slagging and crusting, and blanking is smooth. And a powerful guarantee can be provided for stable and smooth production of the converter.

Description

Technical Field

[0001] The present invention relates to the technical field of smelting, and in particular to a slag-iron separator for a hot metal ladle. Background Art

[0002] In recent years, a smelting mode with low iron consumption and high efficiency has been vigorously promoted. In order to reduce costs, a slag-reducing mode of smelting has been adhered to, with the lime consumption ≤ 28 kg / t of steel. To ensure the slag melting and dephosphorization effect, the lance position during the converter process is relatively high, and the proportion of splashing and drying back is relatively high. The situation of slag sticking to the hood is relatively frequent. Correspondingly, the situation of slag sticking to the flue is also relatively serious. To prevent the accident of steel slag falling off and scratching and damaging the hood, the operator is forced to command the furnace dismantling machine to clean the steel slag stuck in the hood every shift, which not only affects the normal operation time of the converter, but also causes great damage to the equipment and environmental protection control. It causes serious slagging and caking at the upper end of the furnace hood and the dust flue, and at the two side charging ports, blocking the two side charging outlets, preventing the auxiliary materials and alloys from falling into the furnace cavity, seriously affecting the normal production operation, and extremely difficult, time-consuming and laborious for the later treatment, delaying a large amount of converter production time, etc.; frequent slag sticking to the flue poses a great potential safety hazard to production. The most direct impact is to compress the flue diameter, weaken the primary dust removal and exhaust capacity of the converter, and affect the environmental protection control due to poor exhaust of the converter. In addition, when the slag sticking to the flue is serious and uncontrollable, it will fall off and scratch the flue wall, causing production accidents such as water leakage. Especially, the adhesion area of steel slag in the hood is large, the bonding area of steel slag is large and thick, and it is frequent. Due to the large size of steel slag blocks, it is difficult to handle, the treatment time is long, and each treatment requires at least more than 15 minutes, which has an impact on production and there are potential major production accident hazards. Summary of the Invention

[0003] The purpose of the present invention is to provide a slag-iron separator for a hot metal ladle with reasonable structure and good use effect, especially for preventing sticking and separating the steel slag on the water-cooled pipe walls of the furnace hood and the dust flue.

[0004] To achieve the above purpose, the technical solution provided by the present invention is: a slag-iron separator for a hot metal ladle, which includes each component of the separator and the weight percentages are as follows: 8-15% of high-aluminum aggregate powder, 5-8% of quartz sand powder, 4-6% of silica fume, 25-35% of flake graphite powder, 5-10% of zircon sand powder, 4-8% of organic bentonite, 10-18% of liquid aluminum dihydrogen phosphate, 15-50% of water, and 5-10% of fluorite powder.

[0005] The quartz sand powder is ground to -200 mesh, the silica fume is ground to -800 mesh, the flake graphite powder is ground to -200 mesh, the zircon sand is ground to 0.5-3 mm, the organic bentonite is ground to -150 mesh, the high-aluminum aggregate powder is ground to 0.5-2 mm fine particles, and the fluorite powder is ground to -200 mesh by a powder grinding machine; The preparation process of the slag-iron separator includes the following steps: 1), Grind quartz sand powder, silica powder, flake graphite powder, zircon sand powder, organic bentonite, high alumina aggregate powder, and fluorite powder through a powder grinder, and sieve for later use; 2), Pour high alumina aggregate powder, quartz sand powder, silica powder, fluorite powder, and zircon sand powder into a mixer and stir for 5 - 8 minutes at a speed of 600 - 800 revolutions per minute; 3), Pour in flake graphite powder and organic bentonite, and continue to stir for 5 - 10 minutes at a speed of 800 - 1200 revolutions per minute to form a mixed powder; 4), Pour the mixed powder into a reaction kettle with stirring, add liquid agent aluminum dihydrogen phosphate and water, and stir at high speed for 10 - 30 minutes at a speed of 1200 - 2000 revolutions per minute; then keep stirring at a low speed of 400 - 600 revolutions per minute. The pH value of the liquid agent aluminum dihydrogen phosphate is 1.4 - 1.6 to form a slag - iron separator.

[0006] The using process of the slag - iron separator includes the following steps: Clean the converter hood and the water - cooled pipe wall of the dust flue before tapping in the white and middle shifts every day; Inspect the site, confirm whether the cleaning is completed, and use visual inspection or remote shooting by camera; Pour the slag - iron separator into the storage tank through the discharge pipe of the reaction kettle, connect the spray pipe, set up the high - pressure spray gun, and prepare for spraying construction; Spray the converter hood from the platform in front of the furnace. The spraying interval of the converter hood is once every two heats of steel; After the first spraying of the water - cooled pipe wall of the dust flue, conduct regular inspections and spraying according to the smelting frequency and wear cycle.

[0007] Under the working conditions of high corrosion, high temperature (>800°C) or frequent start - stop of the water - cooled pipe wall of the dust flue, spray once every 3 - 12 months.

[0008] The spraying thickness is 1.5 - 3 mm, and finally spray the furnace cover part with a spraying thickness of 2.5 - 4 mm.

[0009] The technical advantages of the present invention are as follows: 1. The slag - iron separator has an obvious effect on slag and crust formation, with a high spraying adhesion rate, high temperature resistance, and strong resistance to dust and smoke erosion. After spraying, a dense protective layer is formed on the converter hood and the water - cooled pipe wall of the dust flue, effectively isolating slag and steel, and ensuring that the two charging ports do not form slag or crust, and the charging is smooth. It can provide a strong guarantee for the stable production of the converter.

[0010] 2. The isolation of splashed slag and steel by the slag - iron separator effectively protects the water - cooled pipe wall of the dust flue, can greatly extend the service life of the dust flue, and effectively prevent the erosion of the furnace hood by dust and smoke, as well as equipment accidents such as the rupture of the water - cooled pipe caused by manual oxygen burning and slag removal by the gun car, resulting in production interruption.

[0011] 3. The spraying construction of the slag-iron separator is simple and convenient, without occupying production time. It uses high-pressure long-distance spraying, with a short spraying time and controllable personnel safety. Description of the Drawings

[0012] Figure 1 It is a comparison of the water-cooled pipe wall of the flue before and after spraying.

[0013] Figure 2 It is the state of the steel slag falling off the hood after spraying.

[0014] Figure 3 Schematic diagram of the steel sticking situation on the hood after spraying.

[0015] Figure 4 Diagram of the steel slag adhesion on the flue and the slag adhesion at the furnace mouth of a 100t converter before using the slag-iron separator.

[0016] Figure 5 Diagram of the steel slag adhesion on the flue and the slag adhesion at the furnace mouth of a 100t converter after using the slag-iron separator. Detailed Embodiments

[0017] The present invention will be further described below in conjunction with all the drawings. The preferred embodiment of the present invention is as follows: Refer to Attachments Figure 1 to Attachments Figure 3 A slag-iron separator for a hot metal ladle described in this embodiment includes each component of the separator and their weight percentages as follows: 8-15% of high-alumina aggregate powder, 5-8% of quartz sand powder, 4-6% of silica fume, 25-35% of flake graphite powder, 5-10% of zircon sand powder, 4-8% of organic bentonite, 10-18% of liquid aluminum dihydrogen phosphate, 15-50% of water, and 5-10% of fluorite powder.

[0018] The preparation process of the above-mentioned slag-iron separator includes the following steps: 1). Grind quartz sand powder, silica fume, flake graphite powder, zircon sand powder, organic bentonite, high-alumina aggregate powder, and fluorite powder through a powder grinder, and sieve them for standby; grind quartz sand powder to -200 mesh, silica fume to -800 mesh, flake graphite powder to -200 mesh, zircon sand to 0.5 - 3mm, organic bentonite to -150 mesh, high-alumina aggregate powder to 0.5 - 2mm fine particles, and fluorite powder to -200 mesh through a powder grinder; 2). Pour high-alumina aggregate powder, quartz sand powder, silica fume, fluorite powder, and zircon sand powder into a mixer and stir for 5-8 minutes at a rotation speed of 600-800 revolutions per minute; 3). Pour in flake graphite powder and organic bentonite, and continue to stir for 5-10 minutes at a rotation speed of 800-1200 revolutions per minute to form a mixed powder; 4), Pour the mixed powder into a reaction kettle with stirring, add the liquid agent aluminum dihydrogen phosphate and water, stir at high speed for 10 - 30 minutes, with a rotation speed of 1200 - 2000 revolutions per minute; then keep stirring at a low speed of 400 - 600 revolutions per minute, and use the liquid agent aluminum dihydrogen phosphate with a pH value of 1.4 - 1.6 to form a slag-iron separator.

[0019] The using process of the slag-iron separator includes the following steps: The first step: Clean the converter hood and the water-cooled pipe wall of the smoke duct before tapping in the white and middle shifts every day. The second step: Check the site to confirm whether the cleaning is completed, using visual inspection or remote shooting with a camera. The third step: Pour the slag-iron separator into the storage tank through the discharge pipe of the reaction kettle, connect the spray pipe, place the high-pressure spray gun well, and prepare for spraying construction. The fourth step: Spray the converter hood from the platform in front of the furnace. The spraying interval of the converter hood is once every two heats of steel. The fifth step: After the first spraying of the water-cooled pipe wall of the smoke duct, conduct regular inspections and spraying according to the smelting frequency and wear cycle. Under the working conditions of high corrosion, high temperature (>800 °C) or frequent start-stop, spray once every 3 - 12 months.

[0020] The spraying thickness of the converter hood and the water-cooled pipe wall of the smoke duct is 1.5 - 3 mm, and finally spray the furnace cover part, with a spraying thickness of 2.5 - 4 mm.

[0021] The functions of each component of the above scheme include: Fluorite reduces the viscosity of the slag, enhances fluidity, and accelerates separation. At the same time, it can improve the high-temperature resistance and chemical stability of refractory materials and extend their service life.

[0022] Flake graphite powder has good properties such as high temperature resistance, electrical conductivity, thermal conductivity, lubrication, plasticity, and acid and alkali resistance, and can effectively reduce the retention of metal droplets in the slag.

[0023] High-aluminum aggregate powder has high heat resistance, corrosion resistance, and wear resistance.

[0024] The amorphous fine particles carried out of the furnace by the flue gas during the smelting of ferrosilicon alloy and metal silicon are collected through the flue gas purification system to form silica fume. It has excellent pozzolanic properties, and at the same time can make waste resources and harmless utilization, reducing the impact of industrial production on humans and the environment, that is, having economic benefits, as well as social and environmental benefits. By adding silica fume, the corrosion resistance, tensile and compressive strength, and wear resistance of the separator are greatly improved, and the flame retardant performance is increased.

[0025] Zircon sand powder has a melting point as high as over 2300 °C, good stability, strong slag erosion resistance, and does not stick to molten steel.

[0026] Organic bentonite is used as an intermediate stabilizer, which has good thickening property, thixotropy, suspension stability, high-temperature stability, lubricity, film-forming property, water resistance and chemical stability.

[0027] The liquid aluminum dihydrogen phosphate will undergo a pyrolysis reaction in a high-temperature environment, generating high-melting-point substances and improving the high-temperature resistance of refractory materials. It can also be used as a hardening agent and a high-temperature binder to enhance the flexural strength, compressive strength and anti-hydration performance of materials, improve the slag phase stability and prevent the slag layer from remelting.

[0028] The technical advantages of the present invention are as follows: 1. The slag-iron separator has an obvious effect on slag and crust formation. It has a high spraying adhesion rate, high temperature resistance and strong resistance to dust and smoke scouring. After spraying, a dense protective layer is formed on the water-cooled pipe walls of the converter hood and the dust duct, effectively isolating the slag and steel, and effectively ensuring that the two feeding ports do not form slag or crust, and the feeding is smooth. It can provide a strong guarantee for the stable production of the converter.

[0029] 2. The isolation of the slag-iron separator for splashed slag and steel effectively protects the water-cooled pipe walls of the dust duct, can greatly extend the service life of the dust duct, and effectively prevents the erosion of the hood dust and the equipment accidents such as the rupture of the water-cooled pipe and the interruption of production caused by manual oxygen burning and slag cleaning by the gun carriage.

[0030] 3. The spraying construction of the slag-iron separator is simple and convenient, does not occupy production time, adopts high-pressure long-distance spraying, has a short spraying time, and the personnel safety is controllable.

[0031] The above-described embodiments are only the preferred embodiments of the present invention, and do not limit the scope of implementation of the present invention. Therefore, all changes made according to the shape and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A slag iron separator for a molten iron ladle, characterized in that: The separator comprises the following components in weight percentage: 8-15% high-alumina aggregate powder, 5-8% quartz sand powder, 4-6% silicon micropowder, 25-35% phosphorus flake graphite powder, 5-10% zircon sand powder, 4-8% organic bentonite, 10-18% liquid aluminum dihydrogen phosphate, 15-50% water and 5-10% fluorite powder.

2. The slag-iron separator for a molten iron ladle according to claim 1, characterized in that: The preparation process of slag iron separator includes the following steps: 1) Grind quartz sand powder, silicon powder, flake graphite powder, zircon sand powder, organic bentonite, high-aluminum aggregate powder and fluorite powder through a powder grinder, and sieve them for later use; 2) Pour high-alumina aggregate powder, quartz sand powder, silica powder, fluorite powder and zircon sand powder into a mixer and stir for 5-8 minutes at a speed of 600-800 rpm; 3) Pour in the phosphorus flake graphite powder and organic bentonite, continue stirring for 5-10 minutes at a speed of 800-1200 rpm to form a mixed powder; 4) Pour the mixed powder into a stirred reactor, add liquid aluminum dihydrogen phosphate and water, stir at high speed for 10-30 minutes at a speed of 1200-2000 rpm; then maintain low-speed stirring at 400-600 rpm, and use a pH value of 1.4-1.6 for the liquid aluminum dihydrogen phosphate to form a slag-iron separator.

3. The slag-iron separator for a molten iron ladle according to claim 1, characterized in that: The use process of slag iron separator includes the following steps: Step 1: Clean the converter cover and the water-cooling tube wall of the smoke duct before steel production during the day and middle shifts every day; Step 2: Check the scene to confirm whether it has been cleaned up, using visual inspection or remote camera photography; The third step: pour the slag iron separator into the storage box through the discharge pipe of the reactor, connect the spray pipe, set up the high-pressure spray gun, and prepare for spraying construction; Step 4: spray the converter cover from the platform in front of the furnace. The interval for spraying the converter cover is once every two heats of steel. Step 5: After the first spraying of the water-cooling pipe wall of the smoke duct, regular inspection and spraying shall be carried out depending on the smelting frequency and wear cycle.

4. The slag-iron separator for a molten iron ladle according to claim 3, characterized in that: The water-cooled pipe wall of the smoke duct should be sprayed once every 3-12 months under conditions of high corrosion, high temperature (>800℃) or frequent start-stop.

5. The slag-iron separator for a molten iron ladle according to claim 3, characterized in that: The spraying thickness of the converter cover and smoke duct water-cooling pipe wall is 1.5~3mm, and finally the furnace cover is sprayed with a spraying thickness of 2.5~4mm.

6. The slag-iron separator for a molten iron ladle according to claim 2, characterized in that: Quartz sand powder is ground to -200 mesh, silicon powder is ground to -800 mesh, flake graphite powder is ground to -200 mesh, zircon sand is ground to 0.5-3mm, organic bentonite is ground to -150 mesh, high alumina aggregate powder is ground to 0.5-2mm particles, and fluorite powder is ground to -200 mesh.

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