5results about How to "Craft short" patented technology

The invention discloses a method for preparing a C / C-SiC composite material through multi-stage recovery of carbon / carbon composite material processing waste, and belongs to the technical field of C / C composite material preparation. The method comprises the following steps: carrying out multi-stage screening treatment on the carbon / carbon composite material processing waste, and screening and separating short carbon fibers and pyrolytic carbon powder; mixing the screened short carbon fibers and pyrolytic carbon powder with phenolic resin, industrial silicon powder and SiC powder, and preparing a fiber reinforced resin block in a mold pressing manner; and carrying out one-step continuous carbonization and ceramic heat treatment on the fiber reinforced resin block to finally obtain the C / C-SiC composite material. According to the method, high-added-value recycling of the C / C processing waste is achieved, the process is simple, the cost is low, operation is convenient and fast, the problems of resource waste and environmental pollution caused by existing waste treatment are solved, and the prepared C / C-SiC composite material is excellent in performance and can be widely applied to the fields of aerospace, high-end manufacturing and the like.

The invention provides a method for preparing an electrocatalyst by using a waste lithium battery and application of the electrocatalyst, and the method comprises the following steps: fully discharging the waste lithium battery, and disassembling to obtain cathode powder; adding a sulfuric acid solution into the cathode powder, and stirring to obtain a turbid liquid; carrying out suction filtration, washing and drying on the turbid liquid to obtain precursor powder; calcining the precursor powder and thiourea in a tubular furnace to obtain a metal sulfide; the mass ratio of the precursor powder to the thiourea is (1: 4)-(1: 6); and adding distilled water into the metal sulfide, stirring, carrying out suction filtration, washing and drying to obtain the electrocatalyst. The electrocatalyst LiMn0. 4Ni0. 4Co0. 2O2-H-ST with an excellent catalytic effect is prepared through simple acid leaching, sulfuration calcination and water leaching and is applied to the field of electrochemistry, PET plastic is converted into a high-value product glycollic acid, and resource utilization of waste is achieved.

The invention discloses a method for synthesizing high-purity manganese acetate, and belongs to the technical field of chemical synthesis. The invention relates to a method for synthesizing high-purity manganese acetate. The method comprises the following steps: preparing high-purity manganese hydroxide into a manganese hydroxide slurry suspension by using pure water; adding the manganese hydroxide slurry suspension and acetic acid into a reaction container for reaction; after the reaction is completed, solid-liquid separation is carried out on the medium in the reaction container, the liquid is a high-purity manganese acetate solution, and the solid is manganese hydroxide which is not completely reacted; and crystallizing and drying the high-purity manganese acetate solution to obtain a high-purity manganese acetate product.

The present application provides a manganese sulfide-molybdenum disulfide heterojunction lithium-sulfur battery positive electrode host material, with molybdenum disulfide nanosheets as the main body, and manganese sulfide nanoparticles are anchored on the molybdenum disulfide nanosheets to form a composite material with a manganese sulfide-molybdenum disulfide heterostructure. The present invention adds manganese disulfide tetrahydrate, anhydrous sodium molybdate and thioacetamide into ultrapure water, stirs at room temperature, and reacts by hydrothermal method to obtain a manganese sulfide-molybdenum disulfide heterojunction composite material. The preparation process of the present invention is short and the process is simple, and the experimental repeatability is good. The prepared manganese sulfide-molybdenum disulfide heterojunction composite material has high electronic conductivity, high catalytic activity for polysulfur intermediate species, and strong chemical adsorption for polysulfides, which effectively alleviates the shuttle effect and improves the kinetics of the electrode reaction process.

The application discloses a ruthenium-based ammonia synthesis catalyst, a preparation method thereof and application of the catalyst in catalytic synthesis of ammonia. The ruthenium-based ammonia synthesis catalyst comprises a high-entropy oxide carrier and a ruthenium active component supported on the carrier; the high-entropy oxide is a single solid solution phase formed by oxides of at least three of Mg, Ca, Sr and Ba and at least two of La, Ce, Pr, Nd and Sm. The preparation method comprises the following steps: mixing soluble salts corresponding to each metal constituting the high-entropy oxide with an organic foaming agent in water, evaporating and concentrating to form a gel, heat-treating the gel at 110-150 DEG C to make the gel foam, and obtaining a porous and fluffy solid precursor; grinding the solid precursor and performing joule heating treatment in a non-oxidizing atmosphere, instantaneously heating the solid precursor to 600-1200 DEG C within 10 seconds, keeping the temperature for 1-10 seconds, and then cooling to obtain the high-entropy oxide carrier; and supporting the ruthenium active component on the high-entropy oxide carrier to obtain the ruthenium-based ammonia synthesis catalyst.