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

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.

The invention discloses a process and equipment for purifying a dilute acetic acid solution. The process comprises the following steps of: extraction, phase splitting, azeotropic distillation, vapor condensation and separation, extracting agent recovery, and the like. The equipment comprises an extraction tower, an azeotropic distillation tower, a stripping tower, a heat exchanger, an acid storage tank, a decanter and a wastewater tank. The invention has the advantages that: the dilute acetic acid solution is concentrated by an extraction process, and the concentrated solution is purified by an azeotropic distillation method, so that steam consumption is reduced, the solvent recovery process is shortened, and the consumption and secondary pollution of a solvent are reduced; and the concentration of acetic acid after separation is more than or equal to 99.0 percent, the concentration of the acetic acid in the discharged water is less than 0.2 percent, the recovery rate of the acetic acid is more than or equal to 95 percent, the consumption of an extracting agent is less than or equal to 0.15 percent, and the steam consumption is less than or equal to 4t/h.

The invention belongs to the field of nuclear fuel. In order to solve the problem that an MOX fuel pellet waste wet recycling technology has many defects, the invention provides a dry recycling technology for MOX fuel pellet waste. The technology comprises the following steps of 1, burning MOX fuel pellet waste; 2, crushing by using a crusher; 3, screening; 4, ball milling; and 5 recycling. According to the technology provided by the invention, powdering of the MOX fuel pellet waste is achieved by crushing-ball milling technologies, so that the technology is fundamentally different from a dry recycling technology for UO2 fuel pellet waste using an oxidized crushing technology. Practical application shows that the MOX fuel pellet waste wet recycling technology provided by the invention has the advantages of high recycling rate, short recycling technical process, high in speed, simple in equipment, low in cost, and being free from generating radioactive liquid waste, and can be recycled in an MOX combustion manufacturer; the recycled power has similar sintering performance with the common MOX raw material powder, and can be mixed with common raw materials for preparing MOX fuel pellets.

The invention relates to a waste paper classification recycling method, a recycling terminal and a recycling system. The waste paper classification recycling method comprises the steps of winding waste paper; detecting the thickness of the winded waste paper; judging whether the paper is a single waste paper sheet or multiple waste paper sheets according to a detection result; if judging the paperis the single waste paper sheet, determining the type of the winded single waste paper sheet; if judging the paper is the multiple waste paper sheets, determining the type of the winded multiple waste paper sheets; and recycling the waste paper according to the type of the winded waste paper. According to the waste paper classification recycling method provided by the invention, the waste paper is classification recycled, so that the waste paper recycling utilization ratio can be effectively improved, the environment pollution is reduced, the recycling quality is high, and a favorable renewable resource recycling environment can be built. The waste paper classification recycling method provided by the invention can be beneficial to shortening a recycling process and reducing the waste paper recycling cost, and has a great help to the improvement of the economic benefit of a papermaking industry.

The invention provides a method for fabricating an NdFeB magnet from a waste NdFeB magnet. The method comprises the steps of providing first powder, wherein the first powder is formed from the waste NdFeB magnet; providing second powder, wherein the second powder is formed from an alloy thin strip; mixing the first powder and the second powder to form mixed powder, wherein the first powder relative to the weight of the mixed powder accounts for 90-99wt%; and sequentially performing magnetic field pressing and matching, vacuum sintering and thermal processing on the mixed powder to form the NdFeB magnet.

The invention provides a method for recovering lithium from a positive electrode material of a waste lithium battery and application, and relates to the technical field of comprehensive recovery of waste lithium battery resources. The method for recovering lithium from the waste lithium battery positive electrode material comprises the steps that the waste lithium battery positive electrode material is leached and separated in a soluble sulfide solution to obtain a lithium-containing solution, the pH of a leaching system is 5-10, the leaching temperature is 20-100 DEG C, the leaching time is 1-6h, and the ratio of the volume of the soluble sulfide solution to the mass of the positive electrode material of the waste lithium battery is 1-20mL/g; and a precipitant is added into the lithium-containing solution to recover the lithium-containing precipitate. According to the method for recovering lithium from the waste lithium battery positive electrode material, the technical problems thatin the prior art, energy consumption is high, management and operation cost is high, selective recycling cannot be achieved, the technical route is relatively complex, and the recycling rate and purity are not high are solved, the loss of valuable metal is avoided, and the harm of waste lithium batteries to the environment is reduced.

The invention relates to the field of denitration, and discloses TiO2-WO3 composite nano powder, a preparation method thereof, an SCR denitration catalyst and a flue gas denitration method. The preparation method of the TiO2-WO3 composite nano powder comprises the following steps: (1) cleaning and ball-milling a waste denitration catalyst to obtain crushed granules, and adding a strong alkali solution to carry out hot alkali treatment and first filtration to obtain filter residues; (2) carrying out acid pickling and water washing on the filter residues, and carrying out second filtration to obtain titanium-tungsten raw powder; and (3) roasting the titanium-tungsten raw powder to obtain the TiO2-WO3 composite nano powder. The preparation method of the TiO2-WO3 composite nano-powder is simple in process and low in cost and can be achieved at a relatively low temperature and under normal pressure, the prepared TiO2-WO3 composite nano-powder has a relatively high specific surface area, anda denitration catalyst prepared from the composite nano-powder has relatively high denitration efficiency.

The invention discloses a method for separating and recovering silver and palladium from silver-palladium alloy scrap. The comprises the following steps of dissolving and leaching high-silver low-palladium alloy scrap by using nitric acid; conducting selective palladium precipitation on the leachate by adding a first palladium precipitation agent, and filtering to obtain silver-rich filtrate and palladium-rich salt; preparing high-purity silver powder from the silver-rich filtrate by adopting a reduction method; and after palladium-rich salt oxidation acid leaching, adding a second palladium precipitation agent for further purification and recovery. By adopting the recovery method to recover palladium, the problem of entrainment loss of precious metal ions caused by a traditional chlorination precipitation method is optimized, the tedious step of repeatedly washing silver chloride precipitates to recover the precious metal ions is avoided, the recovery process of the palladium is greatly shortened, the recovery rate and purity of the palladium are remarkably improved, meanwhile, the influence of the palladium on recovery of the high-purity silver powder is avoided, the energy consumption can be effectively reduced, the difficulty in wastewater treatment is reduced, and the method is environment-friendly.

The invention designs a simple, convenient and efficient regeneration process for a waste nickel-cobalt-manganese ternary lithium ion electrode material, so that a waste nickel-cobalt-manganese positive electrode material and a graphite negative electrode material are simultaneously recycled and regenerated into a sodium ion battery negative electrode material, and belongs to the technical field of lithium ion battery material recycling. The method mainly comprises the following steps: 1, mixing waste anode powder, waste cathode powder and sublimed sulfur according to a certain proportion, and carrying out mechanical ball milling to realize uniform compounding; 2, performing high-temperature calcination in a tubular furnace, and achieving the preparation of the carbon-based metal sulfide composite material in one step; 3, extracting lithium from the composite material by water leaching, and drying the leaching residue to directly use the leaching residue as a sodium ion battery negative electrode material. According to the invention, the pressure of environment and resources can be effectively relieved, and huge economic benefits are brought. Meanwhile, the method is simple and efficient in process and beneficial to large-scale preparation.

The invention provides a method for separating manganese from a ternary lithium ion battery positive electrode leachate, which comprises the following steps: adding a composite oxidant into a ternary lithium ion battery positive electrode material leachate, carrying out oxidation reaction on Mn < 2 + >, precipitating in the form of MnO2, and removing a manganese element in the leachate, wherein the composite oxidant is composed of permanganate and persulfate, and the molar ratio of the permanganate to the persulfate is (8.5-9.5): 1. According to the method, the recovery process of the battery positive electrode material is shortened, the product yield is high, the removal rate of manganese is as high as 98.733%, and the loss rates of cobalt and nickel are as low as 2.44% and 0.48% respectively. The impurity content of the separated MnO2 or MnSO4 is low, the required equipment requirement is simple, the experiment condition is mild, the normal-temperature reaction can be adopted, and the method has good environmental protection and economic benefits.

The invention discloses a method for rapidly recovering rhenium, copper and lead from copper smelting waste acid and a device for implementing the method. According to the method, the copper smelting waste acid is subjected to lead removing through filtering, lead residues with the lead content higher than 55% are obtained and taken as lead extraction raw materials, the lead extraction raw materials are subjected to targeted rhenium precipitation, rhenium-rich residues are obtained and are subjected to hot-pressing oxidizing leaching, a rhenium-rich leaching agent is obtained, the rhenium-rich leaching agent after evaporation and concentration is subjected to KCl rhenium precipitation and recrystallization, potassium perrhenate is prepared, and a liquid obtained after rhenium precipitation is vulcanized for copper deposition. The device comprises a rhenium and copper precipitant storage tank, a precipitation tank, a flocculating agent storage tank, a flocculation reaction tank, a reaction kettle, an evaporation-crystallization device, a centrifugal separator, a waste acid anti-gravity-osmosis filter, a rhenium-rich copper residue anti-gravity-osmosis filter, a filter press, a rhenium and copper precipitation tank steam heating system, a copper precipitation tank steam heating system and a slurry pump. The method and the device have the characteristics of low investment, rapid and short procedures, simple and efficient operation, and high recovery rate, and are clean and environment-friendly.

The invention provides a method for recycling metal and plastics from waste plastics containing metal cladding materials. The method comprises the steps that firstly, the waste plastics containing themetal cladding materials are crushed, 2*2 cm plastic sheets are obtained, and the plastic sheets are soaked in a trichloromethane solution to be processed for 24 hours; the plastic sheets and steel balls are added into a vertical stirring ball mill to be subjected to vacuum ball mill treatment for 20-40 min, and metal cladding materials and stripped plastic sheets are obtained after screening; the metal cladding materials separated from the plastics are further subjected to grinding treatment, copper, nickel and chromium mixed metal powder is obtained, nickel is sucked out through a magnet, and the nickel and the copper and chromium mixed metal powder are obtained separately; and the copper and chromium mixed metal powder is added into diluted hydrochloric acid to react, chromium is dissolved to enter a solution to be converted into a chromium trichloride solution, and copper powder is obtained after filtering. The use device is simple, the recycling process is short in procedure, thecost is low, and industrial production is hopeful to achieve.

The invention discloses a method for recycling valuable metal in a lithium battery positive plate. The method comprises the following steps: S1, mixing a positive plate material with reducing metal, and roasting; the roasting is carried out under a protective atmosphere; s2, performing magnetic separation on the material obtained in the step S1 to obtain a magnetic component and a non-magnetic component; s3, performing acid dissolution on the magnetic component, concentrating the obtained leachate, and performing cooling crystallization to obtain metal salt A; s4, the non-magnetic component is soaked in water, and sediment and water soaking liquid are obtained; adding carbonate into the water immersion liquid to obtain lithium carbonate; and dissolving the sediment with acid, purifying, and evaporating and crystallizing the obtained dissolved solution to obtain the metal salt B. The recovery method provided by the invention can achieve the purpose of omitting extraction and subsidiary steps thereof through simple impurity removal and separation procedures, simplifies the process flow, and saves the investment cost.

The invention discloses a method for recovering silver, indium and cadmium from silver-indium-cadmium alloy waste. The method comprises the following steps: I, smelting the silver-indium-cadmium alloy waste under a vacuum condition to obtain cadmium powder and silver-indium alloy; II, carrying out a leaching reaction on the silver-indium alloy and dilute sulfuric acid and filtering to obtain solid residues and leachate; III, eluting the solid residues through acidic deionized water, then washing the solid residues to be neutral through deionized water, and drying to obtain silver powder; and IV, diluting the leachate, and putting an aluminum plate into the diluted leachate for a replacement reaction to obtain sponge indium. Through adoption of the method, the mass purity of the recycled silver powder is not smaller than 99%, the yield of the silver powder is larger than 99.6%, the mass purity of the recycled sponge indium is not smaller than 99%, the yield of the sponge indium is larger than 99%, the mass purity of the recycled cadmium powder is not smaller than 99%, and the yield of the cadmium powder is larger than 98%. The recycled silver, indium and cadmium can be directly used for preparing a silver-indium-cadmium alloy material.

The invention discloses a nickel-cobalt hydroxide recovery system and method, the recovery system comprises a reaction kettle washing water recovery system, a centrifugal dewatering mother liquor recovery system, a recovery tank, a supernatant recovery system and a solid recovery system, a feed inlet of the recovery tank is respectively communicated with the reaction kettle washing water recovery system and the centrifugal dewatering mother liquor recovery system; the supernate outlet is communicated with the supernate recovery system, and the discharge port of the recovery tank is communicated with the solid recovery system. According to the recycling method disclosed by the invention, the reaction kettle washing water and the dewatering mother liquor are independently recycled into the recycling tank, the nickel-cobalt hydroxide is recycled, the recycled nickel-cobalt hydroxide is low in impurity content, and the recycled nickel-cobalt hydroxide is returned to the processes of filter pressing, washing, centrifugal dewatering, flash drying, screening for iron removal and packaging of the product, so that the product quality is improved. The method not only can improve the final yield of the nickel-cobalt hydroxide, but also can save energy consumption, shorten the recovery process and improve economic benefits.

The invention discloses a method for extracting lithium from a waste lithium ion battery. The method comprises the following steps: mixing battery black powder with carbon, grinding and thermally desorbing; carrying out water immersion on a product after thermal desorption, and filtering to obtain a lithium-containing aqueous solution; and adjusting the pH value of the lithium-containing aqueous solution with sodium salt, concentrating and filtering to obtain a lithium carbonate product. The method for extracting the lithium from the waste lithium ion battery has the advantages that the lithium recovery process is short, the operation is simple, and the recovery rate is high; the active carbon powder is adopted as an extracting agent, lithium is extracted through thermal desorption, the lattice structure of metal oxide is destroyed, dissolution of the cathode material by downstream hydrometallurgy enterprises is facilitated, and no additional additive needs to be added; only the activated carbon powder is added, other chemical substances are not added in the main production line process, no new'three wastes' are discharged, and no secondary pollution is caused.