31results about How to "Good slagging performance" patented technology

The invention discloses a method for preparing chromium-containing iron powder by direct reduction of calcium-free chromium slag, which belongs to the technical field of comprehensive utilization of chromium slag. The method comprises the following steps of: firstly, material preparation, wherein the calcium-free chromium slag is mixed with a reducing agent and fluxing agents comprising alumina, and the four-element alkalinity m(MgO+CaO) / m(SiO2+Al2O3) of the mixed material is equal to 0.9 to 1.3; secondly, agglomeration, wherein the mixed material is pressed or pelletized to obtain agglomerates; thirdly, reduction roasting, wherein the agglomerates are roasted in reducing atmosphere at a reduction temperature of 1,250 to 1,350 DEG C for 30 to 240 minutes; fourthly, crushing and fine grinding, wherein the roasted agglomerates are crushed and ground to be fine; and fifthly, magnetic separation, wherein the finely ground powder is subjected to magnetic separation at magnetic induction intensity of 100 to 200 mT, thereby separating the chromium-containing iron powder. According to the method, the calcium-free chromium slag is completely detoxified and fully recycled, the grade sum of calcium and iron in the prepared chromium-containing iron powder is over 80 percent, the chromium recovery rate and the iron recovery rate are respectively over 78 percent, and the method is low in energy consumption and free from secondary pollution.

The invention relates to a preparation method of a scouring agent for aluminum and an aluminum alloy, which comprises the following steps: firstly, selecting ingredients according to the following percentages by weight: 30-85% of NaCl, 5-40% of Na2SiF6, 5-40% of Na2SO4, 2-20% of CaF2 and 0.5-10% of C6Cl6; uniformly mixing and fully stirring the selected ingredients; placing the mixture into a crucible, carrying out overheat melting to eliminate crystal water, and preserving the temperature for 30-60 minutes; and finally, processing after cooling to obtain the scouring agent. The method has the advantages of simple process and low cost. The prepared scouring agent does not contain sylvite, so that sylvite can not be introduced into the scouring and purifying treatment procedures, and therefore, an aluminum electrolysis cell can not be seriously corroded as a result of the introduction of sylvite when aluminum ash is directly recycled in the cell.

The invention discloses a TIG welding method for improving the welding penetration depth and preventing the back oxidation. The TIG welding method for improving the welding penetration depth and preventing the back oxidation comprises the following steps that firstly, the powder is mixed with a binder according to the mass ratio of 1:4-6, the protective agent is formed, then the protective agent is diluted with acetone at a ratio of 1:5-3:1, the powder comprises the following components of, in percentage by mass, 20%-32% of SiO2, 4%-10% of CaF2, 25-35% of TiO2, 5%-12% of MnO2, 15%-30% of Mn and 16%-25% of Si; secondly, then the protective agent is brushed on the front surface and the back surface of the welding opening, the coating thickness of the front surface is 0.1mm, the thickness ofthe back surface is 2 mm, standing is carried out for 5-10 minutes in air, and then welding is carried out. According to the TIG welding method for improving the welding penetration depth and preventing the back oxidation, the penetration depth of the TIG welding can be greatly improved, the back oxidation of the weld joint can be prevented, forming defects such as weld joint slag inclusion, gas holes, welding penetration and the like are overcome, and one-time welding forming of the stainless steel in the thickness of 5-10 mm is achieved; according to the TIG welding method, a complex multi-layer welder is omitted, the production period is shortened, the energy consumption is reduced, the cost is saved, and the forming quality of the TIG one-time welding is greatly improved.

The invention provides a molten steel refining fluxing agent and its making method. The fluxing agent comprises the following chemical components by weight: 5%-10% of CaO, 20%-30% of MgO, 2%-5% of CaF2, 25%-35% of Al2O3, 2%-5% of B2O3, 15%-25% of SiO2, and the balance less than 20% of inevitable impurities. The making method comprises: 1) conducting burdening: mixing 100-200 mesh industrial raw material powder containing CaO, Al2O3, SiO2, MgO, B2O3 and CaF2 uniformly according to the weight percentage of the fluxing agent; 2) performing ball making: adding 5%-10% of water glass, mixing them evenly, and pressing the mixture into a spherical material; 3) subjecting the spherical material to baking drying for 1-2h at 250-300DEG C, and then cooling the spherical material to room temperature for 4-6h; and 4) conducting screening to obtain the material with a particle size of 10-40mm and a weight content of greater than or equal to 95%, i.e. a finished product. The molten steel refining fluxing agent provided by the invention lowers the melting point of refining slag, shortens the slagging time, improves the refining production rate, and does not pollute the molten steel, and slightly erodes the furnace lining. Compared with the use of fluorite, the production cost is low, and the environmental pollution is small.

The invention discloses a method for direct production of high-grade zinc oxide from a zinc material containing high chlorine and fluorine. The method comprises the following steps of 1, mixing the zinc material containing high chlorine and fluorine, furnace surface ash and smokeless pulverized coal according to a certain ratio, carrying out crushing, adding a binder into the crushed materials, carrying out mixing, and carrying out rolling to obtain balls, 2, after bed coke in a zinc oxidation furnace is red and hot, putting the balls naturally air-dried for two days into the zinc oxidation furnace, carrying out blasting, and discharging waste gas for 10-15min, wherein a blast volume is controlled in 20-30% the total air volume, and 3, after switching out, increasing a blast volume into the zinc oxidation furnace, heating the zinc oxidation furnace to a temperature above 1050 DEG C in 0.5h, controlling an exhaust volume so that an aluminum pipe section furnace gas temperature is in a range of 450-550 DEG C and a bag chamber section furnace gas temperature is in a range of 180-250 DEG C, and carrying out smelting for 1.5-2.5h. The method has wide raw material selection approach and range, a low production cost and a high metal recovery rate and realizes zinc oxide content of 98-99%.

This invention relates to a rustless steel slag-forming and degassing agent, which is specifically a casting accessory material to clean up rustless steel molten steel surface and improve rustless steel quality, and belong to metal surface treatment technique area in foundry industry. This agent mainly comprises 70-80 wt% of dolomite, 10-15 wt% of aluminum dust and 6-15 wt% of fluor. The components are mixed completely in normal temperature and packed to completed product. This invention possesses the properties of increasing life of brasque to more than 200 times; improving slag-forming ability to decrease endermic points, decrease surface points and pocks of buffing surface and increase rate of finished products and improving thermal insulation and degasification by floating constantly on the surface of molten steel, in which molten steel is prevented to contact with air and oxygenized, suck in hydrogen and nitrogen and interfused with foreign substance, so as to ensure cleaner molten steel higher property.

Disclosed is a flux-cored wire. The flux-cored wire includes a mild-carbon steel strip and a flux core. The flux core includes, by weight, 3.0-5.0% of carbon, 0.5-2.5% of manganese, 0.5-2.5% of silicon, 22.0-27.0% of chromium, 2.0-4% of sodium salt, 0.2-0.4% of kali salt, 4-8% of slagging constituents, 9-16% of deoxidizing agents and the balance iron. The flux-cored wire is convenient to process,and meanwhile, during welding, the splash range is small; waste of raw materials is greatly reduced; the production safety hazard is also weakened, so that production efficiency is greatly improved; in addition, a fusion layer after flux-cored welding is just high chromium cast iron, and the high chromium cast iron has high hardness; and therefore, the service life of the fusion layer is greatly prolonged.

The invention relates to a method for shortening the time for smelting ferrovanadium, belonging to the technical field of vanadium metallurgy. this invention. In the method for smelting ferrovanadium of the present invention, vanadium trioxide, vanadium-containing dust and lime are mixed according to a certain ratio to prepare a mixture; water is added to prepare a wet material, which is formed into a wet aggregate; the wet aggregate is dried to obtain Cold-solidified flux-type vanadium-containing pellets; add the dried cold-solidified flux-type vanadium-containing pellets, vanadium flakes, aluminum particles, iron filings, and lime into a vanadium-iron furnace for electric smelting to obtain ferrovanadium alloys. The present invention can achieve the purpose of shortening the smelting time without changing the follow-up conventional stirring method, and the product quality is not affected, and the effect of dust in the on-site environment of the feeding process and the smelting process is reduced.

The invention provides a novel environment-friendly synthetic slag forming material which comprises the following raw material components in parts by weight: 11-14 parts of CaO, 5-25 parts of aluminum ash powder, 70-73 parts of SiO2, 1-2 parts of MnO, 8-10 parts of FeO and 2-5 parts of Y2O3. The novel environmental-friendly synthetic slag forming material is environment-friendly, superior in slag forming performance, and wide in raw material sources, belongs to a resource recycling material, is low in pollution on molten steel during the steel-making using process, and small in generated slag quantity, can remarkably improve the comprehensive performance of a steel-making slag system, and improves the quality of molten steel. The novel environment-friendly synthetic slag forming material, namely a slag former, belongs to comprehensive utilization of industrial wastes, and is reliable in process, low in cost, and profitable.

The invention provides a molten steel refining fluxing agent and its making method. The fluxing agent comprises the following chemical components by weight: 5%-10% of CaO, 20%-30% of MgO, 2%-5% of CaF2, 25%-35% of Al2O3, 2%-5% of B2O3, 15%-25% of SiO2, and the balance less than 20% of inevitable impurities. The making method comprises: 1) conducting burdening: mixing 100-200 mesh industrial raw material powder containing CaO, Al2O3, SiO2, MgO, B2O3 and CaF2 uniformly according to the weight percentage of the fluxing agent; 2) performing ball making: adding 5%-10% of water glass, mixing them evenly, and pressing the mixture into a spherical material; 3) subjecting the spherical material to baking drying for 1-2h at 250-300DEG C, and then cooling the spherical material to room temperature for 4-6h; and 4) conducting screening to obtain the material with a particle size of 10-40mm and a weight content of greater than or equal to 95%, i.e. a finished product. The molten steel refining fluxing agent provided by the invention lowers the melting point of refining slag, shortens the slagging time, improves the refining production rate, and does not pollute the molten steel, and slightly erodes the furnace lining. Compared with the use of fluorite, the production cost is low, and the environmental pollution is small.

The invention relates to laser cladding powder for 1Cr15Ni4Mo3N steel and a preparation method for the laser cladding powder, wherein the laser cladding powder consists of the following components in percentage by weight: 0.09%-0.14% of C, 13.2%-15.2% of Cr, 4.1%-5.3% of Ni, 2.2%-2.7% of Mo, 0.47%-0.98% of Mn, 0.10%-0.93% of Si, 0.03%-0.08% of N, 0.02%-0.15% of B, 0.006%-0.048% of rare earth, 0.010%-0.016% of S, 0.014%-0.022% of P, and the balance iron. The laser cladding powder provided by the invention is specially used in a laser cladding process of 1Cr15Ni4Mo3N steel, so that toughness of a clad layer is improved, excellent bonding strength of a clad interface is guaranteed, wettability of cladding powder is improved, the clad layer is restrained from being cracked, and a crack propagation rate is reduced.

The invention relates to a method for applying auxiliary material of slagging material in the converter steel-making, pertaining to the field of metallurgy. The auxiliary material of the slagging material can be served as a dephosphorizing agent and a slag-melted agent, including: 8.0-9.5 portions by weight of converter steel slag and 0.5-2.0 portions by weight of additive, wherein, the additive includes 5.00-10.00 percent by weight of Na2CO3, 70.00-80.00 percent by weight of FeO and 10.00-20.00 percent by weight of BaCO3. The production of the auxiliary material of the slagging material by adding the additive into the converter steel slag has a plurality of effects, such as realization of recycling of the converter steel slag, which can not only reduce the total amount of waste slag fromsteel-making but reduce consumption of the existing slagging material such as lime and dolomite, improve slagging performance, increase dephosphorization rate by 5.00 to 8.00 percent, reduce the steel slag TFe by 3.00 to 5.00 percent after the steel smelting as well as the blowing damage by about 0.3 percent and increase the metal yield.

A method for directly producing high-grade zinc oxide from zinc materials containing high chlorine and fluorine, the steps are as follows: mixing and crushing zinc materials containing high chlorine and fluorine, furnace dust, and anthracite pulverized coal in a certain proportion, adding viscose Binder, mixed and rolled to form pellets; after the bottom carbon in the zinc-oxygen furnace is red hot, put the pellets that have been naturally air-dried for two days into the zinc-oxygen furnace, blow air, and release exhaust gas for 10 to 15 minutes. The air volume is controlled at 20%~30% of the total air volume; after closing the gate, increase the blast air volume entering the zinc-oxygen furnace, within half an hour, raise the furnace temperature of the zinc-oxygen furnace to above 1050°C, control the air volume, and make the aluminum pipe section furnace The gas temperature is 450-550°C, and the furnace gas temperature in the bag chamber section is 180-250°C; the smelting time is 1.5-2.5 hours. In the method of the invention, the method and scope of raw material selection are wider, the production cost is low, the metal recovery rate is high, and the obtained zinc oxide content reaches 98-99%.

The invention discloses a method of controlling the temperature of an energy-saving environment-friendly laterite-nickel ore smelting shaft furnace through an aluminothermic process, and belongs to the production field of laterite-nickel ores. The method of controlling the temperature of the energy-saving environment-friendly laterite-nickel ore smelting shaft furnace through the aluminothermic process is characterized in that furnace burden smelting is divided into five areas, namely a preheating area, a restoring area, a combustion area, a smelting area and a separation area, then temperature measurement is carried out, and after a peripheral temperature value is measured, a monitoring expert system carries out contrastive analysis and calculates a variation value of the central temperature. The needed absorption heat is calculated through the temperature variation value, the addition quantity of aluminum particles is affirmed, blown-in oxygen and oxygen in raw ores are captured due to the high calorific value of aluminum, aluminum oxide is generated and enters a slag flow, and the temperature in a reaction area is improved rapidly to reach the standard reaction temperature. According to the method of controlling the temperature of the energy-saving environment-friendly laterite-nickel ore smelting shaft furnace through the aluminothermic process, a monitoring expert system is automatic, the reaction is timely, after the aluminum particles are added into crude fuel, the temperature is improved rapidly, the production efficiency is high, the recovery rate of metallic nickel is improved at the same time, and great economical benefits are achieved.

The invention discloses a bromine-containing refining agent for rapid sedimentation of a rare earth magnesium alloy. The bromine-containing refining agent comprises the following components: CaCl2, BaCl2, NaCl, CaF2, BaBr2, bromide and KCl. According to the refining agent, the content of a specific gravity agent is increased, the density of a flux is improved, part of bromine salt is added to serve as a fluxing agent, the spreadability, slagging capacity and refining capacity of the refining agent are improved, inclusions in magnesium melt can be fully removed within the short standing time after refining, flux inclusions are not generated, the grain refining effect is not affected, and the refining effect is good. And the refining process is effectively shortened, and the method is particularly suitable for refining treatment of the magnesium alloy with the rare earth content and high melt viscosity and density. The invention further discloses a preparation method and application of the bromine-containing refining agent.

A TIG welding method that improves welding penetration and prevents back oxidation. The invention can greatly increase TIG welding penetration, prevent weld back oxidation, improve weld slag inclusions, pores, weld penetration and other forming defects, and achieve 5-10mm medium Thick stainless steel is welded and formed at one time. The method saves the cumbersome multi-layer welding process, shortens the production cycle, reduces energy consumption, saves cost, and greatly improves the forming quality of TIG primary welding.

The invention discloses a method for preparing chromium-containing iron powder by direct reduction of calcium-free chromium slag, which belongs to the technical field of comprehensive utilization of chromium slag. The method comprises the following steps of: firstly, material preparation, wherein the calcium-free chromium slag is mixed with a reducing agent and fluxing agents comprising alumina, and the four-element alkalinity m(MgO+CaO) / m(SiO2+Al2O3) of the mixed material is equal to 0.9 to 1.3; secondly, agglomeration, wherein the mixed material is pressed or pelletized to obtain agglomerates; thirdly, reduction roasting, wherein the agglomerates are roasted in reducing atmosphere at a reduction temperature of 1,250 to 1,350 DEG C for 30 to 240 minutes; fourthly, crushing and fine grinding, wherein the roasted agglomerates are crushed and ground to be fine; and fifthly, magnetic separation, wherein the finely ground powder is subjected to magnetic separation at magnetic induction intensity of 100 to 200 mT, thereby separating the chromium-containing iron powder. According to the method, the calcium-free chromium slag is completely detoxified and fully recycled, the grade sum of calcium and iron in the prepared chromium-containing iron powder is over 80 percent, the chromium recovery rate and the iron recovery rate are respectively over 78 percent, and the method is low in energy consumption and free from secondary pollution.

The invention discloses a refining agent for spring steel production furnace external refining and a preparation method thereof. The refining agent is composed of the following raw materials in parts by weight: 20-30 parts of calcium oxide, 8-10 parts of calcium fluoride, 5-8 parts of barium chloride, 5-8 parts of magnesium chloride, 10-15 parts of scrap aluminum powder, 5-10 parts of magnesium oxide, 3-5 parts of rare earth, 5-8 parts of diatom ooze, 10-15 parts of bentonite and 6-8 parts of pyrauxite. The preparation method comprises the following steps: respectively crushing the raw materials into 10-30mm particles with a crusher, weighing the raw materials according to parts by weight, uniformly mixing with a ball mill, screening the uniformly mixed raw materials with a 100-mesh sieve, and finally, baking the screened mixture at 80-100 DEG C. The refining agent has the advantages of high chemical stability, favorable desulfurization and dephosphorization effect, favorable slaggability and high degassing and impurity-removal capacity, and obviously enhances the mechanical properties and corrosion resistance of the spring steel. The method has the advantages of simple preparation technique and low cost.

The invention relates to a preparation method of a scouring agent for aluminum and an aluminum alloy, which comprises the following steps: firstly, selecting ingredients according to the following percentages by weight: 30-85% of NaCl, 5-40% of Na2SiF6, 5-40% of Na2SO4, 2-20% of CaF2 and 0.5-10% of C6Cl6; uniformly mixing and fully stirring the selected ingredients; placing the mixture into a crucible, carrying out overheat melting to eliminate crystal water, and preserving the temperature for 30-60 minutes; and finally, processing after cooling to obtain the scouring agent. The method has the advantages of simple process and low cost. The prepared scouring agent does not contain sylvite, so that sylvite can not be introduced into the scouring and purifying treatment procedures, and therefore, an aluminum electrolysis cell can not be seriously corroded as a result of the introduction of sylvite when aluminum ash is directly recycled in the cell.

Belonging to the field of laterite nickel ore production, the invention relates to a method for controlling the temperature of an energy saving and environment protecting laterite nickel ore smelting shaft furnace by a silicothermic process. The method is characterized in that: first, furnace charge smelting is divided into five areas, i.e. preheating, reduction, combustion, melting and separation, then temperature measuring is conducted, after measuring the surrounding temperature value, contrastive analysis is carried out by a monitoring expert system, and a center temperature variation value is calculated. The needed absorption heat is calculated through the temperature variation value, and accordingly, the adding amount of ferrosilicon can be determined. The high calorific value of silicon can be utilized to capture blown oxygen and oxygen in raw ore. The generated silicon oxide enters a slag flow, and the reaction area temperature can be rapidly raised to reach the standard reaction temperature. The expert monitoring system involved in the method is automated and can make timely response. After ferrosilicon is added to the raw materials, temperature rise become rapid, the production efficiency is high, and meanwhile, the recovery rate of metallic nickel is improved, so that considerable economic benefits can be achieved.

The invention discloses a steelmaking slag-making material, and the slag-making material comprises the following materials in parts by weight: 65-75% of lime, 9-13% of fluorite powder, 16-20% of alumina, 6-8% of dolomite, and impurities. The lime containing in the slag-making material is a necessary ingredient for slag making, modification and the like in steelmaking production, helps to improve the furnace slag basicity, and ensures a good deoxidation effect, the alumina can adjust the slag system melting point, with increasing of the alumina, the viscosity of slag may increase, by control of the content between 16 and 20, a better slag-making effect can be achieved, by addition of the fluorite powder, the slag bonding degree can be reduced, and bonded slag on steel ladles can be prevented, the fluorite powder can accelerate the dissolution of the lime, and improve the furnace slag liquidity, magnesia contained in the dolomite can prolong the life of a fire resistant material, the fluorite powder and the alumina used in the slag-making material are slag materials used by electroslag remelting, and experiments show that the used fluorite powder and the alumina as the steelmaking slag-making material can exhibit better steelmaking slag-making effect, and play the role of turning waste materials into things of value.