54results about How to "Short recycling process" patented technology

The invention relates to an efficient and low-cost VOCs recovery system using air copious cooling. The recovery system comprises a gaseous air purification system, an air liquefaction system, a VOCs recovery cold box and the like, wherein the gaseous air purification system comprises an air filter, a freezing dryer and an air purifier; the air liquefaction system comprises an air compressor, an air storage tank, a turbo expander and an air precooler; and the VOCs recovery cold box comprises a VOCs precooler, a VOCs condenser and a gas-liquid separator. According to the recovery system providedby the invention, air is used as a cooling medium in a VOCs recovery process, so that VOCs are condensed and separated. The treated VOCs gas meets national emission standards and can be directly discharged into the atmosphere. Compared with a traditional condensation method, this method can greatly improve the recovery rate of organic gases, effectively shorten the recovery process and simplify the recovery process. At the same time, the use of the method is not limited by the concentration and composition of a source gas, and the application range is wider.

The invention relates to a low-cost method for preparing high-performance anisotropy neodymium-iron-boron magnetic powder by using neodymium iron boron oil-based slice oil sludge, and belongs to the technical field of recycling of rare-earth permanent magnet wastes. Firstly, cutting fluid and impurities of oil sludge are removed in a physical and chemical separation mode, so that the content of carbon, hydrogen, oxygen and other impurities in the oil sludge can be reduced, and the purification purpose is achieved. The metal calcium (Ca) is taken as a reducing agent to be added and one or morebuffering agents are assisted, namely potassium chloride and calcium chloride are used as the reducing agents, so that a stable reaction system is constructed. According to the reaction system, on thebasis of substantially reducing the use amount of the metal calcium, the reaction can be fully carried out, the grain size and distribution of recycled magnetic powder are greatly improved, and the single crystal proportion and the orientation degree of the recycled magnetic powder are improved; in addition, reactants are pressed into blocks during reaction, so that sufficient and uniform reaction of the reactants is facilitated; a reduction product is ground into powder, the mixture of ice water and the like is used for removing calcium, the oxidation degree of the recovered magnetic powderis reduced, and the speed and the efficiency of calcium removal are improved. The method has the characteristics of economy, high efficiency, environmental protection and the like.

The invention discloses a method for recovering NdFeB casing oil sludge waste through Ca-chloride reduction and diffusion technology, which belongs to the technical field of solid waste recovery and reuse in the rare earth permanent magnet industry. The process includes drying of sintered NdFeB oil sludge waste, reduction and diffusion of Ca-chloride, decalcification by immersion at low temperature, doping of rare earth-rich alloy powder, sintering and heat treatment. Using NdFeB casing hole sludge waste as raw material, Ca-KCl direct reduction and diffusion is used to obtain regenerated NdFeB magnetic powder, and the recovered powder can be sintered to produce regenerated sintered magnets. In this invention, potassium chloride is used as a low-melting point auxiliary agent, which can reduce the reaction temperature and shorten the reaction time, improve the recovery rate, and reduce the amount of calcium metal; the use of low-temperature decalcification can prevent powder oxidation and improve decalcification efficiency; The use of rare earth alloys can supplement rare earths, which is beneficial to composition adjustment and industrial production. The invention realizes the purposes of shortening the recycling process, reducing the recycling cost, reducing the environmental burden and increasing the utilization rate of waste materials.

The invention provides a method for removing fluorine in a nickel-cobalt-manganese solution, belonging to the technical field of solution purification. A method for removing fluorine in a nickel-cobalt-manganese solution, comprising the following steps: separating, crushing, and screening a current collector of a waste lithium-ion battery; dissolving the current collector with an acid to obtain an aluminum-containing solution; adding the aluminum-containing solution to the fluorine-containing nickel-cobalt-manganese The solution is defluorinated to obtain fluorine-containing slag and nickel-cobalt-manganese solution after defluorination. According to the technical scheme provided by the present invention, the concentrations of fluoride ions and aluminum ions in the nickel-cobalt-manganese solution after defluoridation are all less than 0.01g / L; the nickel-cobalt-manganese content in the fluorine-containing slag is all lower than 0.5%; The aluminum-containing solution removes fluorine from the nickel-cobalt-manganese solution, realizing parallel processing of the current collector and battery positive electrode material during lithium-ion battery recycling, shortening the recycling process, and saving recycling costs; after the nickel-cobalt-manganese solution is defluorinated, it enters the subsequent process flow, There is basically no corrosion to the equipment. Moreover, the aluminum content of the nickel-cobalt-manganese solution after defluorination is extremely low, and no aluminum impurities are introduced in the whole defluorination process.

The invention relates to a method for recycling lithium from a lithium ion battery waste electrolyte, and belongs to the technical field of resources cyclic utilization. The invention aims to providethe method for recycling the lithium from the lithium ion battery waste electrolyte. The method is mainly characterized by mixing and reacting the waste electrolyte and a halogenide solution containing a large positive ionic radius, wholly separating PF6- in the electrolyte, deeply purifying the lithium-containing solution after separation, and precipitating the lithium to obtain lithium carbonate, so that the aim of cleanly and high-efficiently utilizing the lithium ion battery waste electrolyte is achieved.