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

The invention relates to a method for deep desulfurization of molten steel refining, a device for refining molten steel and its application. The method is as follows: S1, tapping the molten steel to be refined into a ladle and adding smelting materials into the ladle containing the molten steel to be refined, to obtain the steel material to be refined; S2, according to the Initial sulfur content of molten steel [S] 进 and target sulfur content [S] 目 , to determine the process parameters of lime powder injection, carbon powder injection and top-blown argon gas injection when the steel material to be refined is refined; S3, the steel material to be refined is refined; , injecting lime powder-carbon powder-argon mixed powder flow into the steel material to be refined through the hollow electrode to deeply desulfurize the molten steel. The present invention carries out deep desulfurization by dynamically injecting lime powder and carbon powder through hollow electrodes, which can not only ensure reasonable decarburization and desulfurization of molten steel, improve desulfurization kinetic conditions, increase desulfurization efficiency, shorten smelting time, but also reduce power consumption and electrode loss , to reduce production costs.

The invention relates to an RH fast decarbonization method. The method comprises the following steps: the terminal control of a converter is performed; the temperature of the steel tapping terminal of the converter is controlled within 1675-1705 DEG C; by the mass percentage, the C content at the steel tapping terminal of the converter is controlled within 0.02-0.045%; by the mass percentage, the oxygen content is controlled within 900 ppm; after the steel tapping of the converter is finished, the RH refining is performed; the inlet temperature of molten steel is controlled within 1610-1640 DEG C; an RH judges if the oxygen blowing decarbonization is needed according to the inlet conditions and the carbon-oxygen relation, if so, the oxygen blowing should be performed within 4 min at the beginning of the vacuumizing, and the oxygen blowing quantity is not greater than 150 m3; and the gas flow is increased in the refining process. The method is suitable for the deep decarbonization process of ultralow carbon steel, and can decarbonize the molten steel C below 10*10-6 within 12 min, so that the efficient and fast decarbonization is realized, the RH refining period is shortened, and the temperature drop in the refining process is reduced.

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 a method for purifying ioversol that is x-ray nonionic contrast agent. The method adopts ethanol as recrystallization solvent to recrystallize ioversol crude-product, and the content of the obtained ioversol pure-product is more than 98.5 percent. The method is simple, easy to operate, economical and practical, and suitable for large-scale industrial production.

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.