10results about How to "Good deoxygenation" patented technology

The invention discloses a normal-pressure smelting and casting process for Ti-containing stainless steel, which comprises the following specific process flows: step A, feeding designed raw materials into an intermediate frequency furnace for steel melting; the raw materials in the step B enter an AOD furnace for degassing, deslagging and refining to purify molten steel after being molten; step C, transferring into an intermediate frequency furnace, adding composite slag to make high-alkalinity reducing slag, and covering the molten steel surface with the high-alkalinity reducing slag; d, after the white slag is kept stable, TiFe starts to be added; e, steel tapping is prepared; f, tapping is started after the components are adjusted to reach the standard; g, blowing argon in the whole tapping process, adding a final deoxidizer for final deoxidation protection, and quickly transferring the steel slag into a steel ladle; and H, product casting molding is conducted. Compared with the prior art, argon blowing is adopted in the whole process to isolate outside air, refining is conducted through the AOD furnace, the content of N and the content of S in the molten steel are reduced through argon blowing and oxygen blowing, and a stable reducing slag system is established to cover the molten steel surface in the whole process so as to protect the surface of the molten steel from being oxidized.

The present invention belongs to the field of intelligent metallurgical industry, and discloses a method and system for predicting the real-time temperature of an electric arc furnace after purging. An infrared thermal imager and an argon blowing gun are installed on the top of the electric arc furnace to obtain the temperature of the slag surface and the exposed steel liquid surface in real time; power consumption, oxygen blowing amount, carbon powder amount, lime amount, furnace weight, flue gas composition and temperature, and natural gas amount are collected in real time through a variety of sensors; a molten pool temperature mechanism prediction model is established; based on the collected historical data and recurrent neural network structure, a molten pool temperature dynamic prediction model is established; the current process parameters and mechanism prediction values ​​are input in real time, and the steel liquid surface temperature is output through the dynamic prediction model. The system of the present invention includes an infrared thermal imager, an argon blowing gun, a data acquisition unit, a database, a mechanism model unit, a neural network prediction unit and a control system. The system can realize real-time and high-precision prediction of the steel liquid surface temperature after purging the electric arc furnace, and improve the control accuracy and energy efficiency of the production process.

The invention discloses a catalyst composition, a preparation method and application of the catalyst composition in preparation of light aromatic hydrocarbon by biomass cracking. The catalyst composition comprises a first catalyst and a second catalyst, the first catalyst comprises Fe-modified dolomite particles, the second catalyst comprises a La-modified molecular sieve, the Fe-modified dolomite particles are formed by mechanically mixing and sintering an iron-containing raw material and the dolomite, and the La-modified molecular sieve is a La-modified molecular sieve. The content of Fe in the Fe modified dolomite particles is 4-8 wt%; the La modified molecular sieve is formed by sintering a molecular sieve impregnated with lanthanum nitrate, and the La content in the La modified molecular sieve is 3-8 wt%. The catalyst composition for preparing light aromatic hydrocarbon by biomass cracking has the advantages of high content of light aromatic hydrocarbon in the product and the like.

The invention belongs to the technical field of preparation of high-value chemicals by depolymerizing lignin, and provides a process and a catalyst for preparing aromatic hydrocarbon by hydrodeoxygenation of lignin. The process comprises the following steps: catalyzing and depolymerizing solid lignin into liquid bio-oil by adopting a non-supported NiMo catalyst with higher hydrogenation activity, and carrying out hydrogenation pretreatment on the depolymerized bio-oil under the action of the non-supported NiMo catalyst to improve the stability of the bio-oil, and finally, carrying out hydrodeoxygenation on the pretreated bio-oil by adopting a non-supported MoCuNi catalyst with relatively high selectivity to obtain aromatic hydrocarbon. The process for preparing the aromatic hydrocarbon from the lignin effectively solves the problems of poor stability, high viscosity, high oxygen content and the like of the lignin depolymerized bio-oil, and realizes efficient production of the aromatic hydrocarbon product by hydrodeoxygenation of the lignin. In addition, the adopted catalysts are all non-supported catalysts and have the characteristics of multiple active sites and high catalytic activity, and the preparation method of the catalyst is simple, environment-friendly and pollution-free, and meets the requirements of industrial preparation.

The present invention addresses the problem of providing an Fe-Ni-Cr alloy for sheath pipes of sheathed heaters, said Fe-Ni-Cr alloy having excellent oxidation resistance, corrosion resistance and weldability and being able to be used in a wet high-temperature environment. The problem is solved by an Fe-Ni-Cr alloy which contains, in mass%, from 0.001% to 0.050% of C, from 0.18% to 1.00% of Si, from 0.20% to 0.80% of Mn, 0.030% or less of P, 0.0001% to 0.0020% of S, from 12% to 21% of Ni, from 18% to 24% of Cr, from 0.20% to 1.50% of Mo, 0.30% or less of Cu, from 0.10% to 0.70% ofAl, from 0.10% to 0.70% of Ti, from 0.002% to 0.015% of N, from 0.0001% to 0.0010% of B, from 0.0002% to 0.0030% of O, 0.002% or less of Ca, and from 0.0010% to 0.0150% of REM in total, said REM being composed of one or more elements selected from among La, Ce and Y, with the balance being made up of Fe and unavoidable impurities, and which satisfies formulae 1 and 2. Formula 1: 0.575 x Ni + 1.25 x Cr + 3.43 x Mo - 39 xP - 5.3 xAl - 641 xREM- 1018 x O ≥ 20.0 Formula 2: 1.5 x Mn + 41.3 x Si + 1469 x S - 1.67 xAl-1.34 x Ti - 150 x O - 620 x REM≥ 5.0 Selected figure: Fig. 1

This invention discloses a method for controlling inclusions in titanium-containing ultra-low carbon steel. The steelmaking process is as follows: converter process – LF process – RH process – slab continuous casting process. After aluminum deoxidation and alloying in the RH process, low-reactive slag is added. As the vacuum molten steel circulates, this slag floats to the surface and remains at the steel-slag interface, hindering oxygen transfer from the ladle slag to the molten steel. Simultaneously, this substance has the ability to adsorb inclusions in the steel. By controlling the process parameters of the RH process, oxygen transfer from the ladle slag to the molten steel is effectively prevented, avoiding secondary oxidation of titanium and aluminum elements in the deoxidized steel and controlling the inclusion content in the steel. This invention's control method effectively prevents oxygen transfer from the ladle slag to the molten steel and avoids secondary oxidation of easily oxidized elements such as titanium and aluminum in the deoxidized steel, resulting in significant economic and social benefits.

The invention relates to the field of metallurgical technology, and specifically to a high-wear-resistant machine tool guide rail steel material and a production process thereof, comprising a base material and a high-wear-resistant coating; the raw materials for preparing the high-wear-resistant coating include the following components: rare earth oxides, hexagonal boron nitride, molybdenum disulfide, TaSi2, WC, TiN, FeCrC, Ni, Mo, Co, Fe, Nb, Cr; the machine tool guide rail steel material prepared by the invention has high wear resistance and hardness, and the bonding performance between the base material and the high-wear-resistant coating is good.

The invention discloses molybdenum-chromium-free low-alloy manganese silicon steel and a heat treatment method thereof.The heat treatment method comprises the steps that waste steel is molten and then heated to 1605-1628 DEG C, then preheated automobile steel is added, after the automobile steel is molten, preheated silicon iron and electric furnace ferromanganese are added, and after the silicon iron and the electric furnace ferromanganese are molten, molten steel is obtained; the multi-element alloy wire is fed into the heated molten steel, and a steel billet is cast after slagging-off, standing and cooling; hot-rolling the billet into a steel plate; the steel plate is subjected to austenitizing heat treatment, water-cooling quenching and critical quenching treatment. The alloy material does not contain expensive alloy elements such as molybdenum, nickel, vanadium and niobium, and does not contain chromium element which is poor in resources in China, so that the production cost is low. The molybdenum-chromium-free low-alloy manganese-silicon steel has excellent comprehensive mechanical properties, the tensile strength is larger than 750 MPa, the yield strength is smaller than 505 MPa, the yield ratio is smaller than 0.8, the ductility is larger than 25%, and the molybdenum-chromium-free low-alloy manganese-silicon steel is an important substitute material of a new generation of electric power connection fittings.

The invention discloses a wear-resistant metal composite hammerhead and a preparation method thereof, and belongs to the technical field of preparation of mechanical equipment crusher hammerheads. Comprising the following raw materials in percentage by weight: 20%-32.5% of scrap steel, 21%-26% of pig iron, 1%-3% of rare earth ferrosilicon alloy, 28%-36% of ferrochromium alloy, 8%-12% of ferrotitanium alloy, 4%-7% of high-carbon manganese steel and 0.5%-1% of a modified alterant. According to the invention, the wear resistance of the metal composite hammer head is improved through the synergistic cooperation of rare earth, chromium, titanium, manganese and the modified alterant.

The present application relates to the technical field of biomass energy conversion, and particularly relates to a device for preparing bio-crude oil through continuous hydrothermal liquefaction of biomass, which comprises a pretreatment unit, a hydrothermal reactor, a gas-solid-liquid separator and an oil-water separator connected through pipelines in sequence, and further comprises a catalyst circulation unit for converting solid residues into catalysts, the catalyst circulation unit comprising an activation reactor and a conditioning tank connected in series, the activation reactor being connected in parallel to a feed pipeline of the hydrothermal reactor, and the conditioning tank being connected in parallel to a solid outlet of the gas-solid-liquid separator. According to the present application, the solid residues are converted into catalysts, so that the catalysts are high-performing, the catalysts are recycled during hydrothermal liquefaction, and the bio-crude oil is further upgraded.