45results about How to "Low oxygen content" patented technology

The invention discloses a method for recycling copper from an acid waste etching solution. The method is characterized by comprising the following steps that firstly, an organic phase and the acid waste etching solution are subjected to 1-5 levels of extraction according to the volume ratio of 1-30:1, and copper is extracted; secondly, the load organic phase obtained in the first step and purified water are subjected to 1-5 levels of washing according to the volume ratio of 0.1-10:1; thirdly, the load organic phase washed in the second step and a copper sulphate solution including sulfur acid of 130-250 g/L and copper ions of 1-50 g/L are subjected to 1-3 levels of back extraction according to the volume ratio of 1-10:1, the organic phase obtained through back extraction is returned to the first step to be repeatedly used, and a water phase is a copper sulphate solution; fourthly, metal stainless steel 304 or stainless steel 316 or metal titanium is used as a cathode, the copper sulphate solution obtained in the third step is electroplated under the current density of 50-400 A/m<2>, electroplated copper is obtained, and the copper sulphate solution obtained after the copper is electroplated is returned to the third step to be repeatedly used. According to the method for recycling copper from the acid waste etching solution, the copper can be separated selectively from the acid waste etching solution, the technology is simple, and the separation effect is good.

The invention discloses an Nb-Si-Ti-Ta-B alloy material which is prepared from the following raw materials according to the following atom percentage: 6-20% of Si, 16-30% of Ti, 5-15% of Ta, 2-8% of B and the rest of Nb and unavoidable impurities. In addition, the invention also discloses a method for preparing the Nb-Si-Ti-Ta-B alloy material. The method comprises the following steps: 1, silicon powder, titanium powder, tantalum powder, boron powder and niobium powder are uniformly mixed and the mixture is compacted to form an electrode, and electric arc melting is carried out to obtain an alloy ingot; and 2, the alloy ingot undergoes extrusion so as to obtain the Nb-Si-Ti-Ta-B alloy material. Tensile strength of the Nb-Si-Ti-Ta-B alloy material under the condition of 1300 DEG C is 267MPa-425MPa. Ductility and toughness at room temperature, room-temperature mechanical property and high temperature tensile strength of the Nb-Si-Ti-Ta-B alloy material are well balanced.

The invention relates to a method for recovering copper from an acid waste etching solution. The method is characterized by comprising the following steps of: (1) preparing an organic phase by adopting an Lix series extraction agent with the volume ratio of 5-20% and 80-90% of kerosene or No. 200 solvent oil; (2) performing copper extraction by using the organic phase and the acid waste etching solution according to the volume ratio of (1-30): 1; (3) washing the loaded organic phase obtained in the step (2) and pure water according to the volume ratio of (0.1-10): 1; (4) performing back extraction by using the loaded organic phase after washing in the step (3) and a copper sulfate solution according to the volume ratio of (1-10): 1, and returning the organic phase after back extraction to the step (2) for reuse, wherein a water phase is the copper sulfate solution; and (5) performing copper electrodeposition on the copper sulfate solution obtained in the step (4), and returning the copper sulfate solution after copper electrodeposition to the step (4) for reuse. According to the method for recovering the copper from the acid waste etching solution, disclosed by the invention, the copper can be selectively separated from the acid waste etching solution, the process is simple and the separation effect is good.

The invention discloses a high-purity nickel-based high-temperature alloy and a preparation method of spherical powder of the high-purity nickel-based high-temperature alloy. The alloy comprises the following steps of selecting high-purity metal ingredients, smelting in a vacuum induction suspension smelting furnace, realizing pure smelting by controlling parameters such as smelting vacuum degree, refining temperature, time and the like, then pouring to obtain a steel ingot, and preparing the steel ingot into a bar; carrying out smelting, atomizing and powdering on the bar through EIGA and PREP technologies to obtain spherical metal powder; adopting vibrating screening and airflow classification, and classifying spherical powder under the protection of inert gas. According to the method, the content of nonmetal impurities is effectively controlled through raw material smelting control, atomization process control and post-treatment control, so that chemical elements of the powder have extremely high purity, and the high-purity high-temperature alloy spherical powder is not prone to generating cracks and other defects in the subsequent laser additive printing and laser cladding process and is good in binding force, high in strength, good in toughness and good in mechanical property, and the powder can be used for repairing high-end parts.

The Tibet region in China has the characteristics of high altitude, low air oxygen content, large day and night temperature difference and low night temperature, so that a traditional activated sludgeprocess adopted for domestic sewage treatment at present confronts with the problems of low aeration efficiency, high energy consumption, weak functional microorganism activity and the like when being applied to the Tibet region; meanwhile, the treatment of a large amount of residual sludge threatens the ecological environment of the Tibet region. According to the method, a chemical enhanced primary treatment (CEPT) process and an integrated partial nitrosation-anaerobic ammonia oxidation (CPNA) process are combined, so that the capture of carbon and phosphorus in the inlet water and the whole-course autotrophic nitrogen removal under a low-oxygen condition are realized. The captured carbon source is used for producing biogas through anaerobic fermentation, and can supplement heat for a CPNA process under a low-temperature condition. The CEPT-CPNA process has the advantages of low energy consumption and less residual sludge generation, can solve many problems in the traditional method, and belongs to a sustainable sewage treatment process suitable for a high-altitude environment.

The invention relates to a method for smelting COST-FB2 steel through gas-phase nitriding under a negative pressure condition. The method comprises the following steps that firstly carbon deep deoxidation is performed under the condition of high vacuum degree, deoxidation is completed after the surface of molten steel is stable and bubbles do not rush out any longer; then an alloy element for promoting nitrogen dissolution is added and completely molten, and then gas-phase nitriding is started; during gas-phase nitriding, nitriding pressure during gas-phase nitriding is calculated by using thermodynamic calculation software Factsage, the molten steel temperature is accurately controlled, and the nitriding time is calculated and determined through the surface area of the molten steel, the volume of the molten steel and the nitrogen balance content; when gas-phase nitriding is about to be completed, the alloy element boron and the volatile manganese are added, then through argon filling,pressurization is performed until the high pressure is reached, pressurization casting is performed under the condition that the nitrogen partial pressure is kept unchanged, the under-pressure stateis kept in the solidification process, vacuum breaking is performed after complete solidification, and a COST-FB2 steel cast ingot which has the content of N being 0.015%-0.03% and the content of O being less than or equal to 0.0035%, is uniform in component and compact in structure is prepared.

The invention discloses a preparation method of Y2O3 crucible and application in high-activity metal smelting. The Y2O3 crucible is prepared by pressing dried Y2O3 powder under 100-140 Mpa to be a crucible biscuit; and applying a solid phase sintering method. The high-activity alloy is smelted by a vacuum sensing furnace and the Y2O3 crucible prepared by the method; power is slowly increased during the smelting process, and Ar gas is back flushed in the smelting process; power is slowly reduced during the cooling process after smelting; thus shortcoming of hole formation caused by quick cooling of the high-activity alloy is avoided, and the crack of the Y2O3 crucible is avoided. After smelting, the alloy component is uniform, the crucible is complete; there is no obvious interface layer between the high-activity alloy and the crucible, and oxygen content in the high-activity alloy is low, and the high-activity alloy performance after being smelted is guaranteed; the technique can adjust corresponding technical parameter according to different alloy characteristics, and has excellent industrial application prospect.

Provided are an aluminum scandium alloy target and a method of manufacturing the same. The method comprises: preparing metal aluminum and metal scandium with purities of 99.99% or more respectively; mixing the metal aluminum into the metal scandium and smelting through a plurality of cycles to obtain a desired aluminum scandium alloy, in which the metal scandium account for 5-40 wt % and the metal aluminum account for 60-95 wt %; injecting the aluminum scandium alloy into a mold to obtain an aluminum scandium alloy target billet; and mechanically processing the billet to obtain the aluminum scandium alloy target. The method addresses the problems of the prior art in which uniform distributions of ingredients in the target are difficult to achieve, scandium is not uniformly distributed, and the target has a high oxide content, a low compactness, a low alloy purity and are unsuitable for manufacturing a sputter coating.