CN114315321A - Special drainage agent for cord steel and preparation method thereof - Google Patents
Special drainage agent for cord steel and preparation method thereof Download PDFInfo
- Publication number
- CN114315321A CN114315321A CN202111577856.1A CN202111577856A CN114315321A CN 114315321 A CN114315321 A CN 114315321A CN 202111577856 A CN202111577856 A CN 202111577856A CN 114315321 A CN114315321 A CN 114315321A
- Authority
- CN
- China
- Prior art keywords
- sand
- drainage agent
- weight
- steel
- cord steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Ceramic Products (AREA)
Abstract
The invention provides a special drainage agent for cord steel and a preparation method thereof, belonging to the technical field of consumable cut-off equipment. The special drainage agent for the cord steel comprises the following effective components in percentage by weight: MgO: 30-70% of SiO2：10‑45％、Cr2O3：1.5‑6.0％、Al2O3：0.4‑1.5％、Fe2O3: 0.5-4.0%, C: 0.8 to 8.5 percent. The drainage agent disclosed by the invention is low in chromium content and aluminum oxide, is alkaline overall, can not introduce impurities when contacting molten steel, has the function of adsorbing the impurities, reduces the volatilization discharge of Cr element in the drainage process, reduces the environmental pollution, reduces the content of acid-soluble aluminum in the molten steel, reduces the residue of B-type aluminate impurities, meets the smelting requirement of cord steel, and overcomes the defects and difficulties of the existing product。
Description
Technical Field
The invention belongs to the technical field of consumable cut-off devices, and particularly relates to a special drainage agent for cord steel and a preparation method thereof.
Background
The ladle drainage agent is an unshaped refractory material with high temperature resistance, stable thermal property and molten steel erosion resistance. The ladle is filled in the ladle pocket brick water port before the ladle receives steel, so that the molten steel is prevented from entering the water port to be solidified, and the self-opening failure is avoided. The molten steel is guided to flow into the tundish by automatically falling down along with the opening of the steel ladle sliding plate during casting without sintering at high temperature of a drainage agent, so that the effects of no drainage and no oxygen combustion are achieved, the secondary oxidation of the molten steel is really prevented, the quality of the molten steel is improved, the smooth running of continuous casting is met, and the method is a crucial link for continuous casting and continuous casting.
The current drainage agents used in domestic steel mills are roughly classified into zirconium, chromium, silicon-aluminum, silicon-magnesium and the like so as to meet the smelting requirements of the current stainless steel, carbon steel and super steel. In order to meet the requirements of market steel grade conversion and development, manufacturers continuously upgrade and optimize the drainage agent according to the market operating environment and the steel grade characteristics, strive to meet the requirements of the start-up requirement of the market and the purity index of molten steel, so far, the self-opening rate and index problems highlighted by most steel grades are solved by combining the optimization follow-up of the market requirements through the material characteristics of the manufacturers, but a small amount of steel grades still need to be broken through urgently, especially the cord steel series products. The problems of self-opening rate and aluminate B-type inclusion control in the smelting process of the cord steel are difficult to solve so far.
Based on long-term practical experience, the applicant considers that the main causes of the above problems can be classified into the following points:
firstly, the requirement on inclusion control is very strict in the smelting process of the cord steel, so that the requirement on the purity of molten steel is higher and the requirement on incidental inclusions is zero in order to prevent the fracture phenomenon caused by inclusions in the subsequent wire drawing process, particularly B-type aluminum oxide inclusions.
Secondly, if the inclusions in the steel type of the cord steel are improperly controlled, particularly the inclusions in alumina, the mechanical properties of the products in the later period can be directly influenced. At present, most of conventional drainage agents cannot meet the self-opening requirement of cord steel, the chromium drainage agent can meet the market self-opening requirement, but Al attached to chromium ore sand2O3Molten steel pollution can be caused when the molten steel enters the tundish after casting, inclusions are difficult to remove, and the B-type inclusion index is increased.
Thirdly, in order to ensure the self-opening effect, prevent the secondary oxidation of the drainage molten steel, reduce the usage amount of the chrome ore sand and reduce the consumptionLow Al content for aluminate inclusion2O3The zircon sand component can realize the effects of self-opening and reducing molten steel inclusion, but because of less resources and high cost, the zircon sand component is difficult to popularize and use by iron and steel enterprises.
Disclosure of Invention
In view of the above, the present invention provides a drainage agent for cord steel, so as to improve self-opening effect, reduce acid-soluble aluminum content in molten steel, and reduce inclusion of B-type aluminate.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the special drainage agent for the cord steel comprises the following effective components in percentage by weight: MgO: 30-70% of SiO2：10-45％、Cr2O3：1.5-6.0％、Al2O3：0.4-1.5％、Fe2O3：0.5-4.0％、C：0.8-8.5％。
Preferably, the drainage agent special for the cord steel comprises the following effective components in percentage by weight: MgO: 40-60% of SiO2：20-40％、Cr2O3：2-4％、Al2O3：0.4-0.7％、Fe2O3：1-3％、C：2-6％。
Preferably, the special drainage agent for the cord steel is prepared from sintered magnesia-chrome sand, magnesia olive sand, desert quartz sand and liquid graphite, and the liquid graphite is prepared from a bonding agent, water and phosphorus flake graphite.
The raw materials used in the invention are basically alkalescent materials, and Cr2O3Low content of Al2O3The content is trace, the environment is basically free of gas pollution, impurities can be adsorbed and assimilated by contacting with the molten steel, and the impurities cannot be introduced into the molten steel.
Preferably, the sintered magnesia-chrome sand, the magnesia olive sand, the desert quartz sand and the liquid graphite are sequentially prepared from the following components in parts by weight: 20-75 parts by weight, 10-35 parts by weight, 10-30 parts by weight and 2-18 parts by weight.
Preferably, the weight ratio of the binder, water and flaked graphite is 1: 2: (1.5-2.5).
Preferably, the preparation method of the liquid graphite comprises the following steps: mixing the flake graphite, the adhesive and water according to a weight ratio, and grinding the mixture into pasty liquid solution by a grinder to obtain the graphite.
Preferably, the mass percentage of C in the liquid graphite is more than or equal to 45%.
The invention provides a preparation method of a special drainage agent for cord steel, which comprises the following steps:
firstly, pumping liquid graphite into a charging bucket for later use;
then, accurately metering the sintered magnesia-chrome sand, the magnesia-olive sand and the desert quartz sand, and putting the measured materials into a mixer to be uniformly stirred for 8-15 minutes to obtain a premix;
then, spraying liquid graphite by using a high-pressure pump, atomizing the surface of the premix, continuously stirring and uniformly mixing, atomizing for 2-4 times in each disc, and discharging after 5-10 minutes;
and finally, drying the material, ensuring that the mass percent content of the moisture of the material is controlled within 0.1 percent in the falling process of the material in a drying furnace, cooling, metering, packaging and warehousing.
Preferably, the pressure of the high-pressure pump is 1.2-1.8 MPa.
Preferably, the drying process parameters are as follows: the drying flow is 4-5 tons per hour, the furnace temperature is controlled to be 550 +/-20 ℃, and the exhaust temperature is 150 +/-20 ℃.
The main characteristics and component standards of the raw materials used in the invention are as follows:
the sintered magnesia-chrome sand comprises the following chemical components in percentage by mass: MgO more than 80%, Cr2O3＜8.0％、Al2O3＜2.0％、Fe2O3Less than 3.0 percent; the granularity of 0.3-1.2mm is more than 95 percent.
The material is a co-melting sintered composite material of light-burned magnesium powder and chromium fine powder, also called as magnesium-chromium spinel, has stable high-temperature performance, lower heat transfer and expansion coefficients, high bulk density and good slag resistance, has the refractoriness of 2300 ℃, does not react with molten steel, belongs to sintered high-temperature ceramic, has no molten phase below 2300 ℃, and has high temperature resistance and corrosion resistance.
The magnesium olive sand comprises the following chemical components in percentage by mass: MgO > 42%, SiO2＞40.0％、Al2O3＜1.5％、Fe2O3Less than 3.0 percent; the granularity of 0.5-1.5mm is more than or equal to 95 percent.
The magnesium olive sand has high temperature resistance, corrosion resistance and good chemical stability, is superior to chrome ore sand, magnesia sand and quartz sand in price, has low expansion heat transfer coefficient, is an ideal high temperature resistant substitute material used in the casting industry, can change the phenomena that the acid material is easy to react with molten steel and the furnace lining is corroded, and has no free SiO at high temperature2The high-magnesium material has strong anti-sintering capability, and can relieve the volume expansion of the high-magnesium material at high temperature by being reasonably matched with sintered magnesia-chrome sand and desert quartz sand.
The quartz sand is high-silicon desert sand, and comprises the following chemical components in percentage by mass: SiO 22More than 98 percent; the granularity of 0.3-0.6mm is more than 96 percent. The novel refractory brick has the advantages of large fillet coefficient, high refractoriness, low expansion coefficient, capability of adjusting the grain size collocation of products and capability of effectively preventing molten steel from permeating.
The desert quartz sand is a silicate mineral with stable chemical properties, the component is rolled and impacted by natural wind sand, the fillet coefficient is large, the hardness is large, the density is moderate, the desert quartz sand is a cheap high-temperature resistant material, and the refractoriness at normal temperature can reach more than 1710 ℃.
The main component of the liquid graphite, namely the flake graphite, has high refractoriness, can be fully adhered to the surfaces of particles by using an adhesive, plays a role in isolating the particles at high temperature, can increase the fillet coefficient of the particles by atomization spraying, and can fully improve the flow property of the particles of the drainage agent by the aid of the self-lubricating property, thereby promoting the improvement of the self-opening rate of the drainage agent.
Based on the specific preparation process matched with the components, the self-opening rate of the cord steel can be obviously improved, and meanwhile, the main component of the drainage agent is alkaline and is accompanied by trace Al2O3The components are suitable for the integral smelting and casting requirements of the cord steel, and play a key role in purifying the steel grade.
The special drainage agent for the cord steel is prepared by selecting low-chromium and trace aluminum oxide sintered magnesia-chrome sand, adding magnesia olive sand and high-purity desert quartz sand and adopting a novel carbon coating process. The drainage agent has moderate refractoriness, stable high-temperature performance and strong molten steel permeability resistance, and is combined with a carbon-coated spraying process to reduce edges and corners of particle materials and increase the fillet coefficient of particles, thereby being beneficial to the improvement of the self-opening rate; in addition, the drainage agent has low chromium content and aluminum oxide, is wholly alkaline, can not introduce impurities when contacting molten steel, has the function of adsorbing the impurities, reduces the volatilization and discharge of Cr element in the drainage process, reduces the environmental pollution, reduces the content of acid-soluble aluminum in the molten steel, reduces the residue of B-type aluminate impurities, meets the smelting requirement of the cord steel, and overcomes the defects and the difficult problems of the existing product.
The invention aims to overcome the defects of the steel ladle drainage agent in the use of cord line steel series products, and particularly develops a novel special drainage agent for cord line steel through theoretical support and field use verification. The scheme comprehensively analyzes the problems of unstable self-opening rate and inclusion introduction of various drainage agents in the cord steel smelting process in the current market, a new formula for replacing conventional zirconium and chromium materials is determined again according to the cord steel smelting process and the characteristics of molten steel fully, and a new process method is matched, so that the prepared drainage agent solves the technical problem of the existing drainage agent product in the cord steel using process, the purity of the molten steel is greatly improved, and the quality of steel is guaranteed. Therefore, the drainage agent of the invention fundamentally solves the problem of low Al at present2O3The drainage agent (zirconium) is expensive in material, high in manufacturing cost and incompatible with the current price and situation of steel; solves the problems that the performance of the silicon-aluminum and silicon-magnesium drainage agents and the chromium drainage agents is unstable at high temperature, the self-opening rate is reduced because the silicon-aluminum and silicon-magnesium drainage agents and the chromium drainage agents are easy to expand and excessively sintered in a water gap, and the aluminum and chromium drainage agents Al2O3High content of pollution caused by contact with molten steel; the phenomenon that the self-opening effect of the steel ladle is reduced due to the grain size segregation generated in the transportation and transfer process caused by material specific gravity, grain size difference and the like in the drainage agent is solved; solves the technical problems that the traditional drainage agent has higher acid components and is easy to erode the lining in the using process; solves the problems of large difficulty of on-site drainage operation and continuous castingThe smooth running can not be ensured, the cleanliness of the molten steel is reduced, and the drainage operation has the problems of great potential safety hazard and the like.
Compared with the prior art, the invention has the following beneficial effects:
1. the drainage agent disclosed by the invention is alkaline in overall component, low in chromium component content and trace in aluminum oxide, has no introduced impurities and an impurity adsorption function in the use process, particularly reduces the content of acid-soluble aluminum in molten steel, reduces B-type aluminate impurities, has a function of purifying the molten steel, has no harmful gas emission in the process, reduces field air pollution, realizes gradual realization of chromium-free alkaline refractory materials, and meets the use requirements of cord steel.
2. The method utilizes sintered magnesia-chromite sand as a main material, and adds a proper amount of magnesia-olive sand to replace high-price zircon sand and chrome ore sand, and utilizes the characteristics of high temperature resistance, erosion resistance, low heat transfer expansion coefficient and the like of the material, so that the self-opening rate of the drainage agent in the continuous casting process is stable and is improved to a certain extent.
3. The invention utilizes the implementation of the liquid graphite and the carbon spraying and coating process, reduces the edge angle of the particles, increases the fillet coefficient of the particles, improves the flow property of the product, has better attachment of the carbonaceous material, fully plays an isolation role at high temperature, reduces the dust emission in the construction process and simultaneously improves the use effect of the product.
4. The invention utilizes the blending of the desert quartz sand with the granularity of 0.3-0.6mm to effectively relieve the penetration of the molten steel after the molten steel is contacted with the sand, ensure the controllability of the thickness of a sintering layer, ensure the self-opening rate, solve the secondary oxidation caused by drainage and ensure the quality of the molten steel.
5. The drainage agent prepared by using the alkaline sintered magnesia-chrome sand as the main material and the regenerated raw material as the main material through phase change at high temperature has high density and high refractoriness, can reduce the content of acid-soluble aluminum in molten steel on the premise of ensuring self-opening, particularly the content of alumina in B-type aluminate inclusions, and is suitable for smelting production of cord steel.
Detailed Description
In order to better understand the present invention, the following examples are further provided to clearly illustrate the contents of the present invention, but the contents of the present invention are not limited to the following examples. In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details.
The starting materials used in the following examples are all commercially available unless otherwise specified.
Example 1
A special drainage agent for cord steel is prepared from sintered magnesia-chrome sand, magnesia-olive sand, desert quartz sand and liquid graphite, wherein the liquid graphite is prepared from an adhesive, water and phosphorus flake graphite; the sintered magnesia-chrome sand, the magnesia-olive sand, the desert quartz sand and the liquid graphite are sequentially prepared from the following components in parts by weight: 45 parts by weight, 25 parts by weight and 7 parts by weight; the weight ratio of the adhesive to the water to the flaked graphite is 1: 2: 2.
mixing the flake graphite, the adhesive and water according to a weight ratio, grinding the mixture into pasty liquid solution by a grinding machine, and pumping the pasty liquid solution into a charging bucket; accurately metering sintered magnesia-chrome sand, magnesia-olive sand and desert quartz sand, and putting the materials into a mixer to be uniformly stirred for 10 minutes to obtain a premix; spraying liquid graphite by using a high-pressure pump, wherein the pressure of the high-pressure pump is 1.2MPa, atomizing the surface of the premix, continuously stirring and uniformly mixing, atomizing for 3 times in each disc, and discharging after 5 minutes at intervals; drying the materials, controlling the drying flow rate to be 4.5 tons per hour, controlling the furnace temperature to be 550 ℃ and the air exhaust temperature to be 150 ℃, ensuring that the mass percent content of the water in the falling process of the materials in the drying furnace is controlled within 0.1 percent, cooling to be below 60 ℃, metering, packaging and warehousing.
The special drainage agent for the cord steel comprises the following effective components in percentage by weight: MgO: 46.75% of SiO2：34.8％、Cr2O3：2.71％、Al2O3：0.97％、Fe2O3：1.95％、C：3.43％。
The drainage agent of the embodiment is used on a permanent-connection one-smelting cord steel (72DA), the steel waiting time is 185 minutes on average, and the self-opening rate of the product is 99.8%.
Example 2
A special drainage agent for cord steel is prepared from sintered magnesia-chrome sand, magnesia-olive sand, desert quartz sand and liquid graphite, wherein the liquid graphite is prepared from an adhesive, water and phosphorus flake graphite; the sintered magnesia-chrome sand, the magnesia-olive sand, the desert quartz sand and the liquid graphite are sequentially prepared from the following components in parts by weight: 50 parts by weight, 25 parts by weight, 15 parts by weight and 9 parts by weight; the weight ratio of the adhesive to the water to the flaked graphite is 1: 2: 2.
mixing the flake graphite, the adhesive and water according to a weight ratio, grinding the mixture into pasty liquid solution by a grinding machine, and pumping the pasty liquid solution into a charging bucket; accurately metering sintered magnesia-chrome sand, magnesia-olive sand and desert quartz sand, and putting the materials into a mixer to be uniformly stirred for 8 minutes to obtain a premix; spraying liquid graphite by using a high-pressure pump, wherein the pressure of the high-pressure pump is 1.5MPa, atomizing the surface of the premix, continuously stirring and uniformly mixing, atomizing for 2 times in each disc, and discharging after each time interval of 1 minute and 8 minutes; drying the materials, controlling the drying flow rate to be 4 tons per hour, controlling the furnace temperature to be 530 ℃ and the exhaust temperature to be 130 ℃, ensuring that the mass percent content of the water in the falling process of the materials in the drying furnace is controlled within 0.1 percent, cooling the materials to be below 60 ℃, metering, packaging and warehousing.
The special drainage agent for the cord steel comprises the following effective components in percentage by weight: MgO: 51.26% of SiO2：25.2％、Cr2O3：3.26％、Al2O3：1.06％、Fe2O3：2.05％、C：4.55％。
The drainage agent of the embodiment is used on Qingdao special steel cord steel (LX72A), the steel waiting time is 198 minutes on average, and the self-opening rate of the product is 99.7%.
Example 3
A special drainage agent for cord steel is prepared from sintered magnesia-chrome sand, magnesia-olive sand, desert quartz sand and liquid graphite, wherein the liquid graphite is prepared from an adhesive, water and phosphorus flake graphite; the sintered magnesia-chrome sand, the magnesia-olive sand, the desert quartz sand and the liquid graphite are sequentially prepared from the following components in parts by weight: 62 parts by weight, 15 parts by weight and 8 parts by weight; the weight ratio of the adhesive to the water to the flaked graphite is 1: 2: 2.
mixing the flake graphite, the adhesive and water according to a weight ratio, grinding the mixture into pasty liquid solution by a grinding machine, and pumping the pasty liquid solution into a charging bucket; accurately metering sintered magnesia-chrome sand, magnesia-olive sand and desert quartz sand, and putting the materials into a mixer to be uniformly stirred for 15 minutes to obtain a premix; spraying liquid graphite by using a high-pressure pump, wherein the pressure of the high-pressure pump is 1.8MPa, atomizing the surface of the premix, continuously stirring and uniformly mixing, atomizing for 4 times per disc, and discharging after 10 minutes at intervals of 1 minute each time; drying the materials, controlling the drying flow rate to be 5 tons per hour, controlling the furnace temperature to be 570 ℃ and the exhaust temperature to be 170 ℃, ensuring that the mass percent content of the water in the falling process of the materials in the drying furnace is controlled within 0.1 percent, cooling to be below 60 ℃, metering, packaging and warehousing.
The special drainage agent for the cord steel comprises the following effective components in percentage by weight: MgO: 56.05% and SiO2：20.85％、Cr2O3：3.6％、Al2O3：1.11％、Fe2O3：1.86％、C：4.0％。
The drainage agent of the embodiment is used on the cord steel (LX82B) of an Weifang steelworks, the steel waiting time is 179 minutes averagely, and the self-opening rate of the product is 99.8 percent.
Example 4
A special drainage agent for cord steel is prepared from sintered magnesia-chrome sand, magnesia-olive sand, desert quartz sand and liquid graphite, wherein the liquid graphite is prepared from an adhesive, water and phosphorus flake graphite; the sintered magnesia-chrome sand, the magnesia-olive sand, the desert quartz sand and the liquid graphite are sequentially prepared from the following components in parts by weight: 75 parts by weight, 15 parts by weight, 10 parts by weight and 3 parts by weight; the weight ratio of the adhesive to the water to the flaked graphite is 1: 2: 2.
the preparation method of this embodiment is described in embodiment 1, and is not described again.
The special drainage agent for the cord steel comprises the following effective components in percentage by weight: MgO: 67.9% and SiO2：13.8％、Cr2O3：4.55％、Al2O3：1.36％、Fe2O3：2.31％、C：1.48％。
The drainage agent of the embodiment is used on cord steel (SGLX72A) of a steelworks steel mill, the steel waiting time is 189 minutes on average, and the self-opening rate of the product is 99.8%.
Example 5
A special drainage agent for cord steel is prepared from sintered magnesia-chrome sand, magnesia-olive sand, desert quartz sand and liquid graphite, wherein the liquid graphite is prepared from an adhesive, water and phosphorus flake graphite; the sintered magnesia-chrome sand, the magnesia-olive sand, the desert quartz sand and the liquid graphite are sequentially prepared from the following components in parts by weight: 35 parts by weight, 30 parts by weight, 25 parts by weight and 12 parts by weight; the weight ratio of the adhesive to the water to the flaked graphite is 1: 2: 1.5.
the preparation method of this embodiment refers to embodiment 2, and is not described again.
The special drainage agent for the cord steel comprises the following effective components in percentage by weight: MgO: 43.1% SiO2：36.08％、Cr2O3：2.06％、Al2O3：0.8％、Fe2O3：1.73％、C：5.29％。
Example 6
A special drainage agent for cord steel is prepared from sintered magnesia-chrome sand, magnesia-olive sand, desert quartz sand and liquid graphite, wherein the liquid graphite is prepared from an adhesive, water and phosphorus flake graphite; the sintered magnesia-chrome sand, the magnesia-olive sand, the desert quartz sand and the liquid graphite are sequentially prepared from the following components in parts by weight: 32 parts by weight, 28 parts by weight, 20 parts by weight and 15 parts by weight; the weight ratio of the adhesive to the water to the flaked graphite is 1: 2: 1.8.
the preparation method of this embodiment refers to embodiment 3, and is not described again.
The special drainage agent for the cord steel comprises the following effective components in percentage by weight: MgO: 40.9% of SiO2：32.9％、Cr2O3：2.1％、Al2O3：0.89％、Fe2O3：1.76％、C：6.75％。
Example 7
A special drainage agent for cord steel is prepared from sintered magnesia-chrome sand, magnesia-olive sand, desert quartz sand and liquid graphite, wherein the liquid graphite is prepared from an adhesive, water and phosphorus flake graphite; the sintered magnesia-chrome sand, the magnesia-olive sand, the desert quartz sand and the liquid graphite are sequentially prepared from the following components in parts by weight: 70 parts by weight, 10 parts by weight, 20 parts by weight and 2 parts by weight; the weight ratio of the adhesive to the water to the flaked graphite is 1: 2: 2.5.
the preparation method is shown in example 1.
The special drainage agent for the cord steel comprises the following effective components in percentage by weight: MgO: 60.12% and SiO2：23.24％、Cr2O3：4.12％、Al2O3：1.15％、Fe2O3：2.12％、C：0.88％。
Example 8
A special drainage agent for cord steel is prepared from sintered magnesia-chrome sand, magnesia-olive sand, desert quartz sand and liquid graphite, wherein the liquid graphite is prepared from an adhesive, water and phosphorus flake graphite; the sintered magnesia-chrome sand, the magnesia-olive sand, the desert quartz sand and the liquid graphite are sequentially prepared from the following components in parts by weight: 72 parts by weight, 10 parts by weight, 15 parts by weight and 5 parts by weight; the weight ratio of the adhesive to the water to the flaked graphite is 1: 2: 2.5.
the preparation method is shown in example 1.
The special drainage agent for the cord steel comprises the following effective components in percentage by weight: MgO: 63.41% of SiO2：18.57％、Cr2O3：4.26％、Al2O3：1.28％、Fe2O3：2.25％、C：1.94％。
Example 9
A special drainage agent for cord steel is prepared from sintered magnesia-chrome sand, magnesia-olive sand, desert quartz sand and liquid graphite, wherein the liquid graphite is prepared from an adhesive, water and phosphorus flake graphite; the sintered magnesia-chrome sand, the magnesia-olive sand, the desert quartz sand and the liquid graphite are sequentially prepared from the following components in parts by weight: 20 parts by weight, 35 parts by weight, 30 parts by weight and 18 parts by weight; the weight ratio of the adhesive to the water to the flaked graphite is 1: 2: 2.5.
the preparation method is shown in example 1.
The special drainage agent for the cord steel comprises the following effective components in percentage by weight: MgO: 30.08% and SiO2：44.39％、Cr2O3：1.50％、Al2O3：0.41％、Fe2O3：0.51％、C：8.43％。
The drainage agents obtained in examples 5 to 9 were tried on cord steel in a plurality of steel works such as Winggang, Qingdao special Steel, Weifang Steel works and Shijiazhuang Steel works, and had self-opening rates of 99.7% or more and good self-opening effect stability.
Comparative example 1
The difference from example 1 is: the magnesite was omitted.
The special drainage agent for the cord steel is prepared from sintered magnesia-chrome sand, desert quartz sand and liquid graphite; the sintered magnesia-chrome sand, the desert quartz sand and the liquid graphite sequentially comprise the following components in parts by weight: 45 parts by weight, 25 parts by weight and 7 parts by weight; the preparation method is shown in example 1.
The special drainage agent for the cord steel comprises the following effective components in percentage by weight: MgO: 48.1% SiO2：33.18％、Cr2O3：5.18％、Al2O3：0.73％、Fe2O3：1.89％、C：4.26％。
The drainage agent of the embodiment is used on a permanent one-strand cord steel (72DA), the average time of steel waiting is 185 minutes, and the self-opening rate of the product is 83.5%.
Comparative example 2
A special drainage agent for cord steel is prepared from the following raw materials: 45 parts of sintered magnesia-chrome sand, 25 parts of magnesia-olive sand, 25 parts of desert quartz sand, 3 parts of crystalline flake graphite and 1.5 parts of adhesive.
Accurately metering sintered magnesia-chrome sand, magnesia-olive sand and desert quartz sand, putting the materials into a mixer, uniformly mixing for 10 minutes, adding an adhesive and crystalline flake graphite, continuously stirring until the granularity of a product meets the requirement, conveying the product to a finished product bin, metering and packaging.
The special drainage agent for the cord steel comprises the following effective components in percentage by weight: MgO: 36.6% of SiO2：34.98％、Cr2O3：2.67％、Al2O3：0.84％、Fe2O3：1.36％、C：2.73％。
The drainage agent of the embodiment is used on a piece of permanent one-strand cord steel (72DA), the average time of steel waiting is 185 minutes, and the self-opening rate of the product is 79.6%.
Comparative example 3
A special drainage agent for cord steel is prepared from the following raw materials: 85 parts of sintered magnesia-chrome sand, 15 parts of magnesia-olive sand and 6 parts of liquid graphite.
The preparation method refers to the examples.
The special drainage agent for the cord steel comprises the following effective components in percentage by weight: MgO: 68.91% and SiO2：5.8％、Cr2O3：4.85％、Al2O3：1.63％、Fe2O3：2.45％、C：2.5％。
The drainage agent of the embodiment is used on a permanent one-strand cord steel (72DA), the average time of steel waiting is 185 minutes, and the self-opening rate of the product is 92.3%.
Test example: detection of non-metallic inclusions in class B
The detection method is according to GB/T10561 and according to the specification of a wire rod for GBT27691-2017 steel cords: the quality grade is B grade steel cord wire rod, and the type B of non-metallic inclusion is less than or equal to 0.5 grade.
30 batches of the cord steel LX70B produced by using the drainage agent of examples 1 to 3 and comparative examples 1 to 3 were arbitrarily selected for inclusion detection, and the detection results are shown in the following tables, respectively.
Based on the above test data, it can be seen from the results of comparing example 1 with comparative examples 1 to 3 that the grade of the type B inclusion in the cord steel (wire rod for steel cord) of example 1 is not more than 0.5 and the content thereof is the minimum, which satisfies the standard, and it is demonstrated that the application of the drainage agent of example 1 to the cord steel can reduce the content of the type B inclusion in the molten steel and has the function of purifying the molten steel. Comparative examples 1 to 3 were differently adjusted based on the raw materials or components of the drainage agent of example 1, and the obtained drainage agent was used for the production of cord steel, and the grades of B-type inclusions were all > 0.5 grade, and the contents were all increased as compared with example 1, and thus, it could not perform a good function of adsorbing inclusions.
Reasonable control of B-type non-metal inclusion in the cord steel can better ensure that the content of acid-soluble aluminum in the steel cord wire rod is within a standard range, and the formed inclusion CaO-SiO2-Al2O3In the plasticity area, the phenomenon of breaking in the wire drawing process is prevented.
The above results of comparative examples 1 to 3 show that simply changing a certain raw material or a certain component is not beneficial to improving the self-opening effect of the drainage agent and meeting the clean production requirement of the cord steel based on the overall concept of the present invention.
Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and other modifications or equivalent substitutions made by the technical solutions of the present invention by those of ordinary skill in the art should be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. The special drainage agent for the cord steel is characterized in that: the active ingredients and the weight percentage content are as follows: MgO: 30-70% of SiO2：10-45％、Cr2O3：1.5-6.0％、Al2O3：0.4-1.5％、Fe2O3：0.5-4.0％、C：0.8-8.5％。
2. The drainage agent for cord steel according to claim 1, wherein: the active ingredients and the weight percentage content are as follows: MgO: 40-60% of SiO2：20-40％、Cr2O3：2-4％、Al2O3：0.4-0.7％、Fe2O3：1-3％、C：2-6％。
3. The drainage agent for cord steel according to claim 1 or 2, wherein: is prepared by sintering magnesia-chrome sand, magnesia-olive sand, desert quartz sand and liquid graphite;
the sintered magnesia-chrome sand, the magnesia-olive sand, the desert quartz sand and the liquid graphite sequentially comprise the following components in parts by weight: 20-75 parts by weight, 10-35 parts by weight, 10-30 parts by weight and 2-18 parts by weight.
4. The drainage agent for cord steel according to claim 3, wherein: the liquid graphite is prepared from an adhesive, water and flake graphite, wherein the weight ratio of the adhesive to the water to the flake graphite is 1: 2: (1.5-2.5).
5. The drainage agent for cord steel according to claim 4, wherein: the preparation method of the liquid graphite comprises the following steps: mixing the flake graphite, the adhesive and water according to a weight ratio, and grinding the mixture into pasty liquid solution by a grinder to obtain the flake graphite;
preferably, the mass percentage of C in the liquid graphite is more than or equal to 45%.
6. The drainage agent for cord steel according to claim 5, wherein: the sintered magnesia-chrome sand comprises the following chemical components in percentage by mass: MgO more than 80%, Cr2O3＜8.0％、Al2O3＜2.0％、Fe2O3Less than 3.0 percent; the granularity of 0.3-1.2mm is more than 95 percent.
7. The drainage agent for cord steel according to claim 6, wherein: the magnesium olive sand comprises the following chemical components in percentage by mass: MgO > 42%, SiO2＞40.0％、Al2O3＜1.5％、Fe2O3Less than 3.0 percent; the granularity of 0.5-1.5mm is more than or equal to 95 percent.
8. The drainage agent for cord steel according to claim 7, wherein: the desert quartz sand comprises the following chemical components in percentage by mass: SiO 22More than 98 percent; the granularity of 0.3-0.6mm is more than 96 percent.
9. The method for preparing the drainage agent special for the cord steel according to claim 8, wherein the drainage agent comprises the following components: the method comprises the following steps:
firstly, pumping liquid graphite into a charging bucket for later use;
then, accurately metering the sintered magnesia-chrome sand, the magnesia-olive sand and the desert quartz sand, and putting the measured materials into a mixer to be uniformly stirred for 8-15 minutes to obtain a premix;
then, spraying liquid graphite by using a high-pressure pump, atomizing the surface of the premix, continuously stirring and uniformly mixing, atomizing for 2-4 times in each disc, and discharging after 5-10 minutes;
finally, drying the material to ensure that the mass percent content of the moisture of the material is controlled within 0.1 percent in the falling process of the material in a drying furnace, cooling, metering, packaging and warehousing;
preferably, the pressure of the high-pressure pump is 1.2-1.8 MPa.
10. The method for preparing the drainage agent special for the cord steel according to claim 9, wherein the drainage agent comprises: the drying process parameters are as follows: the drying flow is 4-5 tons per hour, the furnace temperature is controlled to be 550 +/-20 ℃, and the exhaust temperature is 150 +/-20 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111577856.1A CN114315321A (en) | 2021-12-22 | 2021-12-22 | Special drainage agent for cord steel and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111577856.1A CN114315321A (en) | 2021-12-22 | 2021-12-22 | Special drainage agent for cord steel and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114315321A true CN114315321A (en) | 2022-04-12 |
Family
ID=81053740
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111577856.1A Pending CN114315321A (en) | 2021-12-22 | 2021-12-22 | Special drainage agent for cord steel and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114315321A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1267652A (en) * | 1999-03-23 | 2000-09-27 | 四川省威远特种耐火材料实业公司 | Draining sand |
| CN1509827A (en) * | 2002-12-26 | 2004-07-07 | 首钢总公司 | Alkali inducing sand for ladle and production thereof |
| CN104261844A (en) * | 2014-09-19 | 2015-01-07 | 沈阳东大高温材料有限公司 | Magnesium diversion sand for ladles and preparation method thereof |
| EP3103780A1 (en) * | 2015-06-10 | 2016-12-14 | Refractory Intellectual Property GmbH & Co. KG | Refractory ceramic product, use of such a product, electric arc furnace with tapping sput, process of filling the tapping sput of an electric arc furnace and formulation for producing a refractory ceramic product |
| CN109202055A (en) * | 2018-11-27 | 2019-01-15 | 河南通宇冶材集团有限公司 | A kind of excellent special steel drainage agent and preparation method thereof |
-
2021
- 2021-12-22 CN CN202111577856.1A patent/CN114315321A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1267652A (en) * | 1999-03-23 | 2000-09-27 | 四川省威远特种耐火材料实业公司 | Draining sand |
| CN1509827A (en) * | 2002-12-26 | 2004-07-07 | 首钢总公司 | Alkali inducing sand for ladle and production thereof |
| CN104261844A (en) * | 2014-09-19 | 2015-01-07 | 沈阳东大高温材料有限公司 | Magnesium diversion sand for ladles and preparation method thereof |
| EP3103780A1 (en) * | 2015-06-10 | 2016-12-14 | Refractory Intellectual Property GmbH & Co. KG | Refractory ceramic product, use of such a product, electric arc furnace with tapping sput, process of filling the tapping sput of an electric arc furnace and formulation for producing a refractory ceramic product |
| CN109202055A (en) * | 2018-11-27 | 2019-01-15 | 河南通宇冶材集团有限公司 | A kind of excellent special steel drainage agent and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 陈从勇等: ""帘线钢冶炼钢包用耐火材料的研究进展"", 《耐火与石灰》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102336574B (en) | Method for producing waterless taphole mix for blast furnace from high-alumina waste refractory materials | |
| CN100594202C (en) | Fire-resistant gravity flow pouring material and method for making same | |
| CN105837233B (en) | The special steel ultralow carbonaceous collector nozzle of metal bonding corundum and production technology | |
| CN109202055B (en) | High-quality special steel drainage agent and preparation method thereof | |
| CN102233412B (en) | Carbon-free steel ladle drainage agent for extremely-low carbon steel | |
| CN103506614B (en) | Drainage agent special for high manganese steel | |
| CN113072364A (en) | Lightweight refractory castable for blast furnace swinging chute and preparation method thereof | |
| CN101219902A (en) | Environment-protection dry type vibrating material and production method thereof | |
| CN105170968B (en) | A kind of submersed nozzle | |
| CN109750210A (en) | The production method of hypoxemia, hydrogen content potassium steel | |
| CN105367092A (en) | Spray coating capable of preventing slag adhesion | |
| CN109534788B (en) | Low-chromium magnesia-chrome brick for glass kiln | |
| CN107805059A (en) | A kind of Ladle Bottom brick cup and preparation method thereof | |
| CN108178641A (en) | A kind of tundish dry material and preparation method thereof | |
| CN111718199A (en) | Refractory heat-insulating ladle castable | |
| CN109579525A (en) | The system for preparing high-purity potassium steel | |
| CN109678479A (en) | The steel ladle bottom argon blowing air brick of smelting high-purity clear height manganese steel | |
| CN110563449A (en) | Environment-friendly magnesia-carbon gunning mix for RH furnace and preparation method thereof | |
| CN104493150A (en) | Alumina-silica drainage agent and preparation method thereof | |
| CN113603466A (en) | Steel ladle aluminum magnesium refractory mortar for recycling refractory dust-absorbing powder and preparation method thereof | |
| CN112479727B (en) | Preparation method of non-reactive drainage agent | |
| CN102898168A (en) | Compound magnesium-aluminum-chrome refractory castable for copper smelting tundish | |
| CN105272320A (en) | Unfired Al2O3-Cr7C3 brick for hot metal ladle wall and preparation method thereof | |
| CN102807380B (en) | Magnesia-carbon castable and preparation method thereof | |
| CN107434404A (en) | A kind of zirconium composite high-performance electric smelting magnesia calcium zirconium brick and its manufacture method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |