46results about How to "Reduce carbon increase" patented technology

The invention relates to a low-carbon MgO-C brick containing modified phenolic resin and nanocarbon which are produced by nano carbon powder and a preparation method thereof. Phenolic resin bonding agent containing nano carbon powder is produced by ohenol, formaldehyde, a dispersant and nano carbon powder; the low-carbon MgO-C brick is produced by adopting fused magnesite, graphite, phenolic resin and an antioxidant as raw materials. The ultrasonic dispersion method adopted by the invention replaces partial graphite with the nano carbon powder and leads the nano carbon powder into the low-carbon MgO-C brick, thus obviously improving the anti-erosion ability and the oxidation resistance of the MgO-C brick. The brick has comparatively low thermal expansion coefficient, low thermal conductivity, low oxidative mass loss and thinner decarburized layer; a slag resistance experiment under conditions of 1600 DEG C, 3h heat preservation and carbon sequestration shows that erosion and osmosis phenomenon of the brick are not obvious, thereby being applicable to sites of converters, electric furnaces and ladle working linings, external scouring of furnaces, key components for continuous castings and refractories for blast furnace ironmaking etc., thus having comparatively large application range.

The invention relates to a method for producing a tire cord steel wire according to a converter billet continuous casting process and belongs to the technical field of production of tire cord steel wires in the field of ferrous metallurgy. The method comprises the following process steps: desulfurizing by pre-treating molten iron, namely desulfurizing by spraying magnesium on a foundry ladle; smelting by using a converter, namely deoxidizing and alloying, modifying steel ladle slag, re-carburizing the molten iron and adding low-alkalinity pre-melted slag into the steel ladle after tapping; adding ferro-silicon alloy, manganese iron alloy and micronitrogen carburant in the tapping process and re-carburizing; and in the refining process and after the refining is finished, rolling the wire at high speed by adopting a two-stage steel ladle bottom blowing argon system and adopting billet continuous casting of 130mm*130mm or 160mm*160mm. The method has the advantages that: the production isreduced; the production efficiency is improved; and the method is particularly suitable for development and production of tire cord steel products in steel enterprises without big billet or rectangular billet continuous casting and without vacuum treatment equipment.

The invention discloses a preparation method of aluminum-magnesium carbon steel ladle refractory bricks. A refractory brick consists of the following components in parts by weight: 28-32 parts of alpha-corundum, 38-42 parts of fused magnesite, 6-8 parts of fused aluminum-magnesium spinel, 3-4 parts of aluminum oxide micro powder, 1-2 parts of silicon carbide powder, 1.5-2.5 parts of metal aluminum powder, 3-5 parts of phenolic resin and 3-5 parts of crystalline flake graphite. The preparation method comprises the following steps: 1) mixing: firstly mixing the alpha-corundum, fused magnesite and fused aluminum-magnesium spinel in a mixer for 4-6 minutes, adding the phenolic resin, and mixing for 5-8 minutes; adding the crystalline flake graphite and mixing for 12-16 minutes; adding the aluminum oxide micro powder, silicon carbide powder and metal aluminum powder, and mixing for 20-30 minutes; 2) moulding with a press; 3) baking in a drying kiln, wherein the hot air temperature in the kiln body is kept at 200-250 DEG C, and the baking time is not shorter than 12 hours; 4) picking and packaging.

The invention discloses a nano-carbon low-carbon magnesia-carbon brick for ladle slag lines and a preparation method, wherein the magnesia-carbon brick comprises fused magnesia with five particle sizes, dispersible nano-carbon and an antioxidant, and through coating of nano-carbon films on the surfaces of fused magnesia particles with different particle sizes and application of the dispersible nano-carbon, the nano-carbon low-carbon magnesia-carbon brick can be used for ladle slag lines. By utilizing the characteristics that the nano carbon film and the dispersible nano carbon are mainly amorphous carbon, contain a small amount of graphite young crystals, can be infiltrated by a solvent and the like, infiltration and adsorption of the nano carbon film and the dispersible nano carbon to anorganic binding agent are improved, and uniform dispersion of the nano carbon in the magnesia carbon brick is realized; in addition, the size of carbon particles in the magnesia carbon brick is greatly reduced by controlling the sizes of the nanocarbon film and the dispersible nanocarbon with the thickness of 20-200 nanometers, the contact frequency of a refractory raw material of the magnesia carbon brick and the carbon particles is remarkably improved, the performance of the carbon particles is exerted under the condition of low carbon content, and the anti-erosion permeability of the magnesia carbon brick is improved.

The invention relates to a refining method for preventing carbureting of molten steel in an LF through utilizing argon plasmas, and belongs to the field of refining technologies in steelmaking in the metallurgical industry. A technical scheme is characterized in that a solid graphite electrode of the LF is replaced by a hollow graphite electrode, the center hole of the hollow graphite electrode is used to access argon to form an argon plasma arc, so direct contact of the electrode with air and the molten steel is avoided; and the generated plasma arc is used to heat, so the heating time is shortened, the hollow graphite electrode consumption is reduced, the carbureting of the molten steel in the refining process is mitigated, and the carbureting amount of the molten steel is controlled at below 0.005%. The method has the following positive effects: the argon plasma LF can combine all refining functions of present LF technologies, so it is easy to realize an argon plasma furnace from the LF; the generated argon plasmas have the advantages of high heating efficiency, slugging benefiting and the like; the heating period and the smelting period can be shortened; and electric energy is saved. By controlling the carbureting amount in the LF refining process, a decarburization function of RH or VD can be partially replaced, so the steelmaking operation is reduced, and the production cost is saved.

The invention discloses a low-carbon steel carbon content stably-controlled smelting method. The smelting method includes converter smelting, LF refining and continuous casting. According to the method, by reasonably optimizing process parameters and enhancing process capability control, the carbon content can also be stably controlled within 0.05% without RH vacuum processing, the finished product carbon fluctuation range is small and is controlled at 0.03%-0.05%, the target value hit rate is high, product quality stability is facilitated, and judgement amending or scrapping caused by errantcomponents is reduced. The RH decarburization working procedure is not needed; by means of regulation and cooperation of all step conditions, the carbon steel carbon content is stably controlled at 0.03%-0.05%, and the inclusion content is low; and compared with frequently-used smelting process converter-RH decarburization-LF treatment-continuous casting, operation is easy, the production efficiency is high, and the cost of each ton of steel is effectively reduced.

The invention discloses a smelting method of low-carbon and high-manganese steel. Desulfurated molten iron is added into a converter, the end point carbon content is controlled to be 0.03-0.05%, the oxygen value of tapped steel is 400-500 ppm, and the temperature is controlled to be 1660-1680 DEG C; the temperature when molten steel enters an RH furnace is larger than 1610 DEG C, and decarburization is carried out till the carbon content is below 0.01%; the molten steel processed by the RH furnace is added into the converter, and before the molten steel is added, a mixture of manganese metal and aluminum metal is added into the converter so that alloying of manganese can be conducted; after the molten steel is added, the converter is rocked, a burning torch is put and ignited, steel is discharged after alloy in the converter is wholly molten, and the temperature is controlled to be 1600 DEG C or over; and after the steel enters an LF, if the temperature is lower than 1530 DEG C, the temperature is increased to be over 1530 DEG C firstly, and then alloying of manganese can be carried out, and the temperature when the steel is carried out of the LF is larger than 1500 DEG C. By means of the smelting method, the final manganese content in steel can be controlled to be 15-20% stably, the carbon content is controlled to be below 0.05%, and the problem that the low-carbon and high-manganese steel cannot be produced through conventional converters or refining is solved.

A low-carbon magnesia carbon brick containing a nanometer zinc oxide is characterized in that the low-carbon magnesia carbon brick comprises the four following raw materials by weight percentage: 80-94wt% of electric melting magnesia particles, 1-5wt% of crystalline flake graphite, 1-3wt% of metal Al and 1-5wt% of nanometer zinc oxide, and 2-4wt% of a phenol formaldehyde resin with the quantity ofthe weight percentage sum of the four raw materials. The low-carbon magnesia carbon brick utilizes the characteristics of the nanometer zinc oxide powders such as fine granularity, high activity at high temperature, moderate price, and the like to improve the microstructure of the low-carbon magnesia carbon brick, prompts the used metal Al antioxidant to sufficiently play the role and prepares the low-carbon magnesia carbon brick with excellent comprehensive performance and moderate price. The prepared low-carbon magnesia carbon brick can be used for the steel-making furnace, the refining furnace and the lining of the steel ladle in the steel metallurgical industry, reduces the carbon added in the molten steel, reduces the temperature reduction of the molten steel and is beneficial for improving the quality of the steel and saving the energy resource.

The invention relates to a stopper rod for continuous casting of high-oxygen steel. The stopper rod comprises a rod head, a rod body and a slag line section, wherein the rod head is made of Spinel-C and comprises the following chemical components in percentage by weight: 60 to 72 percent of Al2O3, 20 to 30 percent of MgO, 5 to 10 percent of C and the balance of trace impurities, and an antioxidant and a phenolic resin binding agent are additionally added; the rod body is made of Al2O3-Spinel-C and comprises the following chemical components in percentage by weight: 70 to 80 percent of Al2O3, 5 to 10 percent of MgO, 15 to 23 percent of C and the balance of trace impurities, and an antioxidant and a phenolic resin binding agent are additionally added; and the slag line segment is made of a MgO-Spinel-C material. According to the invention, when being applied to high-oxygen steel casting, the low-melting-point phase cannot be formed, good corrosion resistance is achieved, recarburization of molten steel is reduced, and the number of continuous casting furnaces is increased.

The invention relates to the technical field of magnesia carbon brick refractory materials, in particular to a low carbon magnesia carbon brick and a preparation method thereof. The technical proposal comprises the following steps: mixing 58 to 70 weight percent of magnesite grains, 20 to 28 weight percent of magnesite fine powder, 0.5 to 5 weight percent of expansion graphite, 0 to 6 weight percent of crystalline flake graphite, 1 to 5 weight percent of antioxidant, 0.1 to 5 weight percent of metal fibre and 1.5 to 4.5 weight percent of phenolic resin; and molding and drying the mixture to prepare a low carbon magnesia carbon brick of which carbon content is between 2 and 7 percent. The low carbon magnesia carbon brick prepared by the invention has the advantages of low heat expansion rate, good scale resistant performance, good high temperature strengthen, good thermal shock resistant performance, good toughness and corrosion resistance, and the brick is not easy to fracture when using.

The invention relates to a low-carbon MgO-C brick containing modified phenolic resin and nanocarbon which are produced by nano carbon powder and a preparation method thereof. Phenolic resin bonding agent containing nano carbon powder is produced by ohenol, formaldehyde, a dispersant and nano carbon powder; the low-carbon MgO-C brick is produced by adopting fused magnesite, graphite, phenolic resin and an antioxidant as raw materials. The ultrasonic dispersion method adopted by the invention replaces partial graphite with the nano carbon powder and leads the nano carbon powder into the low-carbon MgO-C brick, thus obviously improving the anti-erosion ability and the oxidation resistance of the MgO-C brick. The brick has comparatively low thermal expansion coefficient, low thermal conductivity, low oxidative mass loss and thinner decarburized layer; a slag resistance experiment under conditions of 1600 DEG C, 3h heat preservation and carbon sequestration shows that erosion and osmosis phenomenon of the brick are not obvious, thereby being applicable to sites of converters, electric furnaces and ladle working linings, external scouring of furnaces, key components for continuous castings and refractories for blast furnace ironmaking etc., thus having comparatively large application range.

The invention discloses a metal complex low-carbon magnesia carbon brick used for ladle slag lines, the weight percentage of the added materials is as following, 50 to 70 percent of magnesia particles, 25 to 35 percent of magnesia powder, and 3 to 6 percent of organic binder, furthermore, the following components are added which are produced by mixing, striating materials, forming and heat-treatment, 0 to 4 percent of flake graphite, 3 to 15 percent of metal powder, and 0.5 to 3 percent of antioxidant containing boron. The antioxidant properties, slag-resistance performance, high temperature strength and the thermal shock resistance of the ladle slag line used metal complex low-carbon magnesia carbon brick are greatly improved, the service life is prolonged, the consumption cost of each ton of refractories is lowered. The preparation method of ladle slag line used metal complex low-carbon magnesia carbon bricks is also disclosed, and the carbon content in the ladle slag line used metal complex low-carbon magnesia carbon bricks produced by the method is less than or equal to 6 percent, little carbon is added so as to reduce the pollution towards liquid steel, and residual strength ratio of the thermal shock resistance is kept at 70 to 80 percent.

The invention relates to a refining method for preventing carbureting of molten steel in an LF through utilizing argon plasmas, and belongs to the field of refining technologies in steelmaking in the metallurgical industry. A technical scheme is characterized in that a solid graphite electrode of the LF is replaced by a hollow graphite electrode, the center hole of the hollow graphite electrode is used to access argon to form an argon plasma arc, so direct contact of the electrode with air and the molten steel is avoided; and the generated plasma arc is used to heat, so the heating time is shortened, the hollow graphite electrode consumption is reduced, the carbureting of the molten steel in the refining process is mitigated, and the carbureting amount of the molten steel is controlled at below 0.005%. The method has the following positive effects: the argon plasma LF can combine all refining functions of present LF technologies, so it is easy to realize an argon plasma furnace from the LF; the generated argon plasmas have the advantages of high heating efficiency, slugging benefiting and the like; the heating period and the smelting period can be shortened; and electric energy is saved. By controlling the carbureting amount in the LF refining process, a decarburization function of RH or VD can be partially replaced, so the steelmaking operation is reduced, and the production cost is saved.