34results about How to "Shorten the refining cycle" patented technology

The invention belongs to the technical field of steelmaking, and particularly relates to a dynamic control method for refining ultra-low carbon steel through RH CO2 spraying. The dynamic control method is suitable for a 30-300 t RH ladle refining process. In the RH refining process, O2 and CO2 are adopted as top-blowing gases, Ar and CO2 are used as lifting gases; molten steel components in the refining process are predicted based on material conservation according to RH refining in-station molten steel component data, refining process furnace gas component data and vacuum equipment working conditions; the top blowing and lifting gas flow is dynamically adjusted according to requirements of target components of refined molten steel stage by stage; on the basis of strengthening the stirringeffect of the RH refining process, the nitrogen content in the molten steel is further reduced, and the quality of molten steel is improved; and meanwhile, excessive oxidation of the molten steel inthe RH decarbonization process is avoided, the consumption of a deoxidized alloy is reduced, and on the basis of reducing the consumption of Ar, the production cost is further reduced, and the refining period is shortened. As a result, the alloy consumption is reduced by 3%-8%, the RH refining period is shortened by 1-2 minutes, the denitrification amount is increased by (3-10)*10<-6>, and the quality of the molten steel is improved.

The invention relates to the refining field of the steel through vacuum treatment and particularly relates to an electrode rotation double-station electric arc heating vacuum treatment device and a using method thereof. The electrode rotation double-station electric arc heating vacuum treatment device comprises two treatment stations. Each treatment station comprises a vacuum tanker (1) and a vacuum tank (2). The device is characterized in that each treatment station further comprises a lifting device (3), a vacuum tank cover (4), a jacking device (5) and the like. The using method of the electrode rotation double-station electric arc heating vacuum treatment device comprises the following steps of: heating the electrode; blowing argon at bottom and stirring; and degassing in vacuum. The device provided by the invention has the advantages of low equipment investment, short refining period, high refining quality and flexible combination.

The invention discloses a bottom blowing refining furnace and application thereof. The bottom blowing refining furnace comprises a rotary furnace and a bottom blowing redox gun; specifically, the rotary furnace comprises a rotary furnace casing, a furnace opening, a copper inlet and a copper outlet; a hearth space is limited in the rotary furnace casing; the furnace opening is formed in the upperpart at the middle section of the rotary furnace casing; the copper inlet is formed in the rotary furnace casing; the copper outlet is formed in the side wall of the end part of the rotary furnace casing; the bottom blowing redox gun is arranged at the bottom of the rotary furnace casing and extends into the hearth space; the diameter of the bottom blowing redox gunrefining furnace is 38 to 75 cm.The bottom blowing refining furnace does not need to arrange gas permeable bricks or separately arrange a smoke outlet or a burner; a furnace body is simple in structure and low in equipment cost, and can avoid energy consumption loss because the gas permeable bricks are blown with nitrogen; besides, when the bottom blowing refining furnace refines crude copper, the redox efficiency can be remarkably improved, the refining cycle of the crude copper is shortened and the refining effect is improved.

The invention provides an erosion-resistant CAS-OB refining device for a dipping cover. The service life of the dipping cover can be prolonged, the production cost is reduced, and the refining efficiency is improved. The erosion-resistant CAS-OB refining device for the dipping cover provided by the invention comprises a dipping cover, a dipping cover lifting device, an oxygen lance, an alloy material chute, slag, a steel ladle and perforated bricks, and is characterized by also comprising a motor, a transmission shaft, a gear and a concave-convex connection buckle, wherein the upper part of the dipping cover is a fixed part, and the lower part of the dipping cover is a rotating part, and the two parts are connected by virtue of the concave-convex connection buckle. According to the erosion-resistant CAS-OB refining device provided by the invention, the structure of the CAS-OB dipping cover is changed, the asymmetric erosion degree of the dipping cover is alleviated, the utilization rate and operation rate of equipment are improved, the refining cycle is shortened, and the aim of prolonging the service life of the dipping cover is achieved.

The invention discloses a high-purity metformin hydrochloride preparation method. N-methyl pyrrolidone is used as a solvent, dicyandiamide and dimethylamine hydrochloride are taken as a solute, the solvent and the solute are added into a synthesis kettle for reaction, and metformin hydrochloride is prepared through steps of stirring, cooling, spin-drying, washing, crystallizing and drying. The metformin hydrochloride prepared through the preparation method provided by the invention has the advantages that the yield is higher than 96.4 percent, and the product purity is higher than 99.93 percent.

The invention discloses an efficient ladle furnace refining method based on thin-slab casting and rolling production of high-strength steel. The efficient ladle furnace refining method is characterized in that in a converter tapping stage, the converter tapping temperature ranges from 1,680 DEG C to 1,700 DEG C; quick oxygen probing is performed on molten steel in an argon station, and the addition of aluminum is determined according to the oxygen content; the ingredients and the alkalinity of an appropriate slag system are determined in the ladle furnace slagging stage; in the ladle furnace heating stage, after molten steel arrives at a station, a lower electrode heats up the molten steel, the heating power is controlled in a segmented manner, crusting on the slag surface is realized in the earlier stage, and slugging is performed at low gear; and after melting of slag, the slag surface is uniformly coated, heating is performed at high gear, point heating is adopted in the later stage, and one-time heating is performed to reach the required temperature. The efficient ladle furnace refining method can shorten the refining cycle by about 5 min, and therefore, shortens the procedure period; the electrode heating time is averagely shortened by 1 min, so that the power consumption is reduced; and after adoption of the ingredients of the new slag system, the desulphurization efficiency is improved, and the lime consumption is reduced by 3 kg/ton steel.

The invention relates to a smelting method for rapidly heating a refining furnace under a low-alkalinity slag condition. When sulfur-containing non-quenched and tempered steel is produced, the adding amount of quartz sand is controlled in the earlier stage of LF furnace refining, namely the alkalinity of slag is controlled, a certain amount of carbonaceous deoxidizing agent is added for deoxidation, the foaming performance of the slag is improved, and therefore power transmission and temperature rising are carried out under the condition that the electrode submerged arc effect is good, the temperature of molten steel is raised to the outbound temperature range, and finally low-alkalinity slag adjustment is carried out. By means of the smelting method, the heating rate of the refining furnace is greatly increased, the heating rate of the refining furnace is increased by 30%-40%, the refining period is shortened by 10-15 minutes, and the actual use and popularization value is obvious.

The invention provides an aluminum calcium deoxidization desulfuration slagging agent for quick deoxidizing, quick desulfurizing, removing foreign matters in molten steel and effectively improving inherent quality of steel in metallurgy.The main technical point is that weight parts of each component are calcium carbide of 1, calcium-aluminum alloy and calcium-aluminum slag of 6-14, calcium-silicon alloy and calcium-silicon slag of 2-6, lime or iimestone of 1-6, aluminum and AD powder of 1-4.According to the invention, process steps of material selecting, pulverizing, drying, ingredient mixing and the like are performed according to the above matching, production processes of LF(VD), CAS, RH and the like can be all adapted, therefore, technique effects of shortening the refining operation period, reducing material consumption of deoxidization, accelerating slag forming speed and arc burying speed, reducing electricity consumption and reducing temperature of molten steel; by replacing CaF2 by CaC2, the furnace liner is protected effectively, service life of the furnace liner can be assured, and the production cost can be reduced. The preparation method of the invention is simple and the deoxidization and desulfuration guideline of the product exceeds that of the existing product.

The invention discloses a method for shortening the slag melting time of a ladle refining furnace by frequency-conversion ultrasonic waves, and solves the problems of long smelting cycle and low production efficiency due to slow slag melting speed. The method includes the following steps: tapping out of the converter or electric furnace, pouring molten steel into the ladle, placing the ladle in the refining station, starting the argon blowing and stirring, and adding the slagging material and deoxidizing material while starting the ultrasonic generator, the ultrasonic generator Installed on the side wall of the ladle, the ultrasonic stirring position is on the contact interface between the synthetic slag and the molten steel. The invention can shorten the refining time by more than 10 minutes, can also promote the reaction between synthetic slag and molten steel, and improve the efficiency of removing inclusions and gases. Ultrasonic high-frequency vibration and radiation pressure can form effective agitation and flow in gas and liquid. Improve the operating efficiency of production equipment.

The invention discloses a steelmaking method with efficient refining. The steelmaking method includes the steps that smelting is carried out by a conventional converter; tapping is carried out, specifically, silico-manganese alloy is added when tapping is carried out to one third; lime and a fast-refining fluoride-free slag-regulating agent are added at the same time when tapping is carried out two thirds; deoxidation is carried out at argon station: firstly aluminum wires are added, and then ferro-aluminum is added to the surface of ladle slag; and continuous casting and post processes are carried out. Through the technical measures such as adding the fast-refining fluoride-free slag-regulating agent, the rapid slagging time of the converter is shortened by 3 minutes, the refining slagging time is reduced, and the LF refining cycle is shortened by at least 5 min.

The invention discloses a stirring device for processing tea oil. The stirring device comprises a reaction cylinder and a cylinder cover matched with the reaction cylinder, the periphery of the cylinder cover is provided with an oil inlet, a shell is arranged outside the reaction cylinder, a heating cavity is reserved between the shell and the reaction cylinder, the lower part of the shell is provided with a liquid inlet, the upper part of the shell is provided with a liquid outlet, an end cover with the same diameter as the diameter of the cylinder cover is fixed on the cylinder cover, a low-speed shaft motor is arranged at the center position of the top of the end cover, high-speed shaft motors are arranged on the two sides of the low-speed shaft motor, high-speed shafts are arranged onthe two high-speed shaft motors, stirring blades are arranged on the high-speed shafts, turbulent flow holes are uniformly distributed on the stirring blades, a low-speed shaft is arranged on the low-speed shaft motor, and an anchor stirrer is arranged on the low-speed shaft. The stirring device for processing the tea oil has the advantages of being reasonable in structure, flexible to use and high in heating efficiency.

The invention discloses a node control method for treating low-carbon-aluminum molten killed steel through an LF refining furnace. The node control method includes the following steps that pull-in large argon stirring is carried out for 0.5-1.5 min; temperature measuring and oxygen measuring are carried out for 0.5-1.5 min, aluminum wires and first-batch lime are added at 1-3 min, aluminum is controlled at 0.05-0.06%, and large argon stirring is carried out for 1-3 min; sampling and temperature measuring are carried out for 1-3 min; energization is carried out, aluminum slag is added, and slagging and temperature rising are carried out for 5-10 min; aluminum preparing and temperature measuring are carried out for 0.5-1.5 min; large argon stirring is carried out for 0.5-1.5 min; temperatureadjusting is carried out for 1-3 min; calcification treatment is carried out for 1-3 min; sampling is carried out; and soft blowing is carried out. By means of the method, the power consumption of the LF refining furnace can be reduced, and meanwhile the refining period is shortened so that the requirement of the high yield can be conveniently met.

The invention relates to a clean steel smelting system and method, and belongs to the technical field of metallurgy. The clean steel smelting system comprises a primary smelting furnace, a slag-steel separation device, a refining furnace and a continuous casting ladle which are sequentially arranged in the flowing direction of molten steel, the slag-steel separation device is used for removing high-oxidability steel slag in the molten steel, deoxidation alloying operation is not carried out during primary smelting tapping, and deoxidation and alloying are carried out in sequence during refining. By arranging the slag-steel separation device, the high-oxidability steel slag of the primary smelting furnace is prevented from entering the refining process, the possibility that the molten steel is polluted is reduced, and the consumption of alloy for steel slag deoxidation is reduced; and meanwhile, the alloying operation is carried out in the refining furnace after deoxidation is finished, so that the alloy yield is increased, and generation of oxide inclusions is inhibited from the source.

The invention relates to a novel AOD spiral side gun. The novel AOD spiral side gun comprises a main gun, an auxiliary gun and a spiral lining plate, wherein the main gun serves as a center pipe, theauxiliary gun is arranged outside the main gun in a sleeving mode, the main gun and the auxiliary gun are coaxially arranged, the spiral lining plate is arranged in the main gun, so that gas in the main gun rotates, the spiral lining plate is made of red copper, the thickness of the spiral lining plate is 2 mm, the screw pitch of the spiral lining plate is 700 mm, the main gun is made of red copper, the thickness of the main gun is 3 mm, the diameter of the outer wall of the main gun is 21 mm, the auxiliary gun is made of stainless steel, the thickness of the auxiliary gun is 4 mm, the diameter of the outer wall of the auxiliary gun is 34 mm. According to the novel AOD spiral side gun, the structure is simple, transformation is convenient, implementation is easy, refractory bricks, a masonry mode and the like do not need to be specially changed, and application and popularization are facilitated.

The invention provides a lead bullion refining device and a lead bullion refining method. The crude lead refining device comprises a refining furnace, the refining furnace is provided with a furnace cavity, the furnace cavity is horizontally divided into a first refining area and a second refining area, and the bottoms of the first refining area and the second refining area are communicated; wherein the first refining area is used for conducting refining and copper removal on lead bullion to produce lead matte and copper-removed lead bullion; a first heat supply unit is arranged at the upper part of the first refining area; a cooling unit is arranged outside the first refining area, the first refining area is further provided with an outer circulation flow path, and the cooling unit is arranged on the outer circulation flow path; the second refining area is used for oxidizing the copper-removed lead bullion to remove arsenic, antimony and tin so as to form softened lead, and the second refining area is provided with an oxygen supply unit and a second heat supply unit. The lead bullion refining period is effectively shortened, the energy consumption of lead refining is reduced, and the project construction investment is reduced.