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The application provides a method for removing impurity elements sulfur and oxygen in scrap steel electric furnace smelting, which comprises the following steps: electric furnace smelting under the protection of refining protective slag, wherein, during smelting, desulfurization is firstly performed, and then deoxidation is performed to obtain a product, the smelting temperature is 1673-1923K; the refining slag is selected from CaO-Al2O3-SiO2-MgO system slag, CaO in the refining slag is 58-65wt%, SiO2 is 8.5-11wt%, and CaO / SiO2 is 5.8-6.4. The application removes the impurity element sulfur in scrap steel through the designed refining slag, improves the purity of scrap steel through the combined use of special amount and special type of deoxidizer A and deoxidizer B, and provides guarantee for realizing the recycling of scrap steel; the impurity elements sulfur and oxygen in scrap steel are effectively removed, the requirements of producing high-quality steel with impurity elements are met, and the recycling of scrap steel resources is realized.

This invention belongs to the field of alloy forming technology and discloses a 2GPa-grade hydrogen embrittlement-resistant hot-formed steel containing NbVTiMo composite precipitates, its preparation method, and its applications. Through the synergistic proportioning of Nb, V, Ti, and Mo quaternary microalloys, a NbVTiMo composite nano-precipitate with high thermal stability and good interfacial bonding is formed. Compared with traditional single / low-element microalloy precipitates, this composite precipitate can act as a highly efficient hydrogen trap, significantly improving the hydrogen atom capture ability, effectively inhibiting hydrogen enrichment at grain boundaries and defects, improving the hydrogen embrittlement resistance of hot-formed steel, and reducing the risk of hydrogen-induced cracking and delayed fracture. Simultaneously, extending the coiling holding time promotes the full nucleation and dispersed distribution of the precipitates; shortening the austenitizing holding time avoids excessive dissolution and coarsening of the precipitates, maintaining the nanoscale of the precipitates, and achieving a fine and dense distribution of the precipitates, thus balancing hydrogen embrittlement resistance with the strength and toughness of the steel.

The application discloses a method for regulating dynamic recrystallization structure of austenitic stainless steel thick plate, which comprises the following steps: (1) diffusing annealing austenitic stainless steel thick slab at 1230-1260 DEG C to obtain homogenized slab; (2) after hot rolling of the homogenized slab, immediately performing large deformation hot rolling with single pass reduction of 25-50% to obtain rough rolling plate with surface temperature not lower than 1090 DEG C; if the thickness of the rough rolling plate reaches the required thickness, then water cooling to room temperature to obtain controlled hot rolling plate; otherwise, the next step is performed; (3) after rapidly cooling the rough rolling plate to below 920 DEG C, performing small deformation hot rolling with single pass reduction of 5-10%, total reduction is greater than or equal to 25%, and then water cooling to room temperature to obtain controlled hot rolling plate. The application adopts special 'high-temperature large reduction assisted low-temperature small reduction' process to regulate dynamic recrystallization behavior of the material to obtain uniformly distributed recrystallization grain structure, aiming at the problem that it is difficult to control the hot rolling structure of the austenitic stainless steel thick slab. The process has strong operability and can realize industrial application.

This invention belongs to the field of novel pollutant removal technology, disclosing a photocatalyst, its preparation method, and its application in antibiotic degradation. The invention first synthesizes a hydroxyl organic amine imine cage, and then prepares a flexible hydroxyl organic amine cationic cage with abundant N sites through a series of structural modifications. The N sites of the molecular cage are used to stabilize a photosensitive metal salt. By reducing the photosensitive metal salt, photosensitive metal nanoclusters are obtained and immobilized in the cavity or framework sites of the molecular cage to obtain a photocatalyst. Due to its small photosensitive metal nanoparticle size, fully exposed catalytic active sites, and good water solubility, this catalyst, utilizing the homogeneous catalyst principle, exhibits advantages such as high degradation efficiency, wide variety of antibiotics in wastewater, and good reusability, making it suitable for the purification treatment of biochemical wastewater in sewage treatment plants.

The application discloses a method for preparing hydrogen by using hydroquinone as raw material. The method comprises the following steps: uniformly mixing hydroquinone, a catalyst and water, and then heating and reacting under a non-active gas atmosphere to obtain a product containing hydrogen. The yield of hydrogen can reach 83.8 mmol. The hydroquinone is one of main pollutants in phenolic wastewater. The conversion of the hydroquinone into hydrogen by catalysis is beneficial to the resource utilization of the phenolic wastewater, and the process has high treatment efficiency and is environment-friendly. From the perspectives of waste utilization and clean energy development, the process has important academic significance and potential application prospect.