43results about How to "Realize closed loop recycling" patented technology

The invention provides a leaching and recycling method for metals in anode waste materials of lithium-ion batteries. The leaching method comprises the steps that: the anode waste materials of the lithium-ion batteries react with organic acid solution containing a reducing agent; after reaction, solid-liquid separation is carried out and leaching solution and filter residues are obtained, so that the leaching of the metals in the anode waste materials of the lithium-ion batteries is realized. Based on the leaching method, the invention provides a recycling method for the anode waste materials of the lithium-ion batteries based on closed-loop circulation of metals. The leaching method for the metals in the anode waste materials of the lithium-ion batteries has the advantages of high metal leaching rate, short leaching time, low processing cost and wide application range; secondary pollution and complex process for separating and purifying various metals in the leaching solution are avoided; according to the recycling method for the metals in the anode waste materials of the lithium-ion batteries, the technological process is short and the closed-loop circulation of the metals is realized.

The invention relates to a classifying and recycling process for waste magnesia carbon bricks produced after use of steel tundish working linings as well as a dry material and a coating material for a tundish. The waste magnesia carbon bricks produced after use of the steel tundish working linings are subjected to recovery processing and are classified into reclaimed materials with three grain levels, i.e., the granularity is more than or equal to 3mm and less than 5mm, the granularity is more than or equal to 1mm and less than 3mm and the granularity is less than 1mm; the reclaimed materials with the granularity more than or equal to 3mm and less than 5mm and the granularity more than or equal to 1mm and less than 3mm are used as raw materials to prepare the dry material for the tundish, and the dry material is used for carrying out continuous casting on a slag line 2 and a tundish wall 3 and a tundish bottom 4 below the slag line 2 of the tundish working lining; the reclaimed materials with the granularity more than or equal to 1mm and less than 3mm and the granularity less than 1mm are used as raw materials to prepare the coating material for the tundish, and the coating material for the tundish is used for carrying out continuous costing on a tundish edge 1 above the slag line of the tundish working lining. The invention further provides a construction method for manufacturing the combined continuous casting tundish working lining by adopting the dry material and the coating material for the tundish. According to the classifying and recycling process, the dry material and the coating material for the tundish and the construction method, the classifying and recycling rate of the waste magnesia carbon bricks produced after use of the steel tundish working linings reaches 100 percent.

The invention discloses a method for regenerating waste lithium nickel cobalt manganate ternary cathode material of. The method comprises lixiviating the waste lithium nickel cobalt manganate ternarycathode material by using phosphoric acid- citric acid mixed acid solution to obtain a lixivium; adjusting the metal ion ratio of the lixivium by a nickel salt, a cobalt salt and a manganese salt, andthen adding the lixivium into an oxalic acid solution for coprecipitation reaction; pre-calcining the obtained precipitate to obtain nickel cobalt manganese oxide, and grinding and mixing the nickelcobalt manganese oxide with a lithium source, calcining a resultant object to obtain a regenerated lithium nickel cobalt manganate ternary cathode material; The method adopts mixed acid lixiviating process, the acid consumption is small, the lixiviating time is short, the cost is low, the environmental impact is small, and the reducing agent is not needed, and the process is simple; The mixed acidlixivium is directly used for synthesizing ternary cathode materials, thereby avoiding the complicated process of separating and purifying various metals in the lixivium in the prior art, and realizing the closed-loop recycling utilization of metals.

The invention relates to a method for recycling multiple elements of liquid after cyanided tailing flotation, belonging to the technical field of gold smelting, cyanided tailing flotation of lead and copper concentrate, and waste water treatment of sulfur concentrate. The method comprises the following steps: obtaining lead concentrate through flotation; comprehensively recycling gold and silver from liquid after lead flotation; obtaining copper concentrate through flotation; comprehensively recycling gold, silver and copper from liquid after copper flotation; obtaining sulfur concentrate through flotation; recycling gold and silver through gold-loaded activated carbon desorption electrodeposition; and the like. By the method, the comprehensive utilization efficiency of resources is improved, closed loop recycle of the liquid in a flotation system is achieved, zero discharge of wastewater is achieved, pollution to the surrounding environment is reduced, and ultimately the economic efficiency of an enterprise is improved.

The invention discloses electroplating equipment, which consists of an electroplating groove, an anode, a cathode, an electroplating liquid, an automatic additive replenishing system, a circular filtering system, an electric heating system, a water bath circular heat supply center, an automatic purifying system and an electroplating rectifying power supply. The electroplating equipment is generally suitable for electroplating of super hard material products, and particularly relates to electroplating of wear-resistant composite layers and electroplating of diamond geological drill bits. Production process conditions have high stability and consistence; the electroplating liquid treatment period is prolonged effectively, closed-loop circular utilization of the electroplating liquid is realized, energy is saved, and the environment is protected; meanwhile, the working environment is improved greatly, and the physical and psychological health of employees is facilitated; and the product quality is more stable and is improved greatly, the product yield is increased by 13 percent, electricity is saved by 56.2 percent, and the product cost is reduced by 32.7 percent.

The invention discloses a comprehensive treatment method for smelting dust containing miscellaneous gold concentrate and belongs to the technical field of precious metal pyrometallurgy. The comprehensive treatment method for the smelting dust containing the miscellaneous gold concentrate comprises the steps that firstly, the smelting dust is subjected to primary hydrochloric acid leaching, leachedslurry is subjected to high-price antimony reduction and hydrolysis antimony fixing, high-antimony gold concentrate and primarily-hydrolyzed liquid are obtained, secondary hydrochloric acid leachingis conducted on the high-antimony gold concentrate, high-grade gold concentrate with low impurities and secondary lixivium are obtained, high-grade oxychloride and secondarily-hydrolyzed liquid are obtained after hydrolysis is conducted on the secondary lixivium, dechlorinating transformation is conducted on the oxychloride, and then an antimony white terminal product is obtained; and a molysite arsenic fixing process is adopted for arsenic-containing liquid, and stable low-toxicity arsenic compound ferric arsenate and arsenic-removed liquid are obtained. By the adoption of the method, the smelting dust containing the miscellaneous gold concentrate is treated, the precise metal antimony can be effectively recovered, and the harmful element arsenate is fixed, so that the industrial problemthat arsenic and antimony dust is difficult to treat is solved.

The invention relates to a method for recovery and recycle of multiple elements in a liquid obtained by cyanidation tailing flotation and belongs to the technical field of gold smelting and treatment on a waste liquid obtained by flotation of lead, copper concentrate and sulfur concentrate in cyanidation tailings. The method comprises the following steps of carrying out flotation to obtain lead concentrate, carrying out comprehensive recovery of gold and silver in a liquid obtained by lead flotation, carrying out flotation to obtain copper concentrate, carrying out comprehensive recovery of gold, silver and copper in a liquid obtained by copper flotation, carrying out flotation to obtain sulfur concentrate, and recovering gold and silver by gold-loaded activated carbon desorption eletrolysis. The method improves resource comprehensive utilization efficiency, realizes closed cycle utilization of a flotation system liquid, realizes zero discharge of waste water, reduces the pollution of the surrounding environment, and improves economic benefits of enterprises.

The invention discloses a method for separating valuable components of monazite slags, and particularly relates to a method for separating valuable components of monazite slags into a liquid phase (a solution containing uranium, thorium and rare earth) and a solid phase (a filter residue containing useful minerals such as monazite, zirconite and rutile). The method is characterized by comprising the following steps of acid leaching, filter pressing and water scrubbing. According to the invention, monazite slags are subjected to low-acid and low-temperature leaching, and a liquid phase and a solid phase are separated easily; after secondary slags are subjected to mineral processing and alkaline decomposition by using a mineral processing process, the closed cycle collection of uranium, thorium and rare earths can be realized; meanwhile, an extract residue waste acid can be subjected to cyclic utilization, thereby reducing the wastewater discharge, reducing the consumption of sulfuric acids and new water and the wastewater treatment cost, and reducing the production cost; and the recovery rates of valuable elements such as uranium, thorium and rare earths can be greater than 97%, therefore, an effect of no radioactive wastewater and waste residue discharge in the whole process can be achieved.

The invention discloses a resource utilization method of a high-concentration ammonia nitrogen waste liquid. The method comprises the steps as follows: 1, impurity removal: after copper in an etching liquid containing copper is recovered, an ion exchange technique is utilized to absorb and recover low-concentration copper ions in residual high-concentration ammonia nitrogen wastewater, and a regenerative copper chloride raw material is obtained after resin dissolving; and an appropriate amount of barium chloride is added in wastewater without copper so as to remove sulfate radical impurities introduced during a copper sulfate production process; and 2, blending: residual wastewater without copper is the high-concentration ammonia nitrogen wastewater, ammonium chloride concentration is adjusted with an addition method or through evaporation and concentration by a multi-effect evaporator, and then an auxiliary etching liquid is blended according to a corresponding formula and is reused for the circuit board industry. With the adoption of the method, not only is an environmental pollution problem caused by heavy metal ions and the high-concentration ammonia nitrogen waste liquid solved, but also the closed cyclic utilization of the etching liquid of the circuit board industry is achieved, the resource is saved, and the environment is protected.

The invention discloses a method for recycling waste terylene fibers. The method comprises the following steps of primarily crushing the waste terylene fibers to obtain staple fiber pompons; purifying and degrading on the staple fiber pompons by dense microwave fields with high-frequency rotation; performing vacuum pumping on water and oil; finally, grinding and crushing to obtain finely-ground terephthalate (BHET) polymer powder; meanwhile, the invention provides a device system and microwave purifying equipment for realizing the method. The method, the device system and the microwave purifying equipment disclosed by the invention have the advantages that the waste terylene fibers are recycled by adopting microwave purification degradation to obtain the BHET polymer powder which can be used as the polyester raw materials; an original recovery mode of obtaining bubble powder is thoroughly changed, and closed circulating recovery of the waste terylene fibers is realized; the method is green and environment-friendly, high in economy and resource-saving; the device system and the equipment provide hardware guarantee for realizing the method.

The invention discloses a method for treating ammonia nitrogen in tungsten smelting by using extraction absorption. According to the method, the recovery rate of the ammonia nitrogen is further improved, and the working environment is improved and the production cost is decreased. Primary extraction: organic phase extractants are added to weak aqua ammonia recycled by evaporation to perform extraction to obtain ammonium ions NH4+, and free water and hydroxide ions in ammonia water enter extraction residual liquid water phases; secondary extraction: industrial concentrated hydrochloric acids are added in extracted organic phases, heavy phases after reverse extraction are ammonium chloride at the bottom; light phases containing P507 organic phases enter a next circle for extraction after washing; an reverse extraction solution of an ammonium chloride solution is subjected to ammonia absorption; ammonia water with a concentration of 110g/l returns to a tungsten smelting departure and transfer procedure to serve as an analyzing agent; and final washing: salt-free water is added to organic phases after reverse extraction, organic phase residual ammonium chloride is guaranteed to be discharged as far as possible, an after-washing solution is an ammonium chloride solution, the ammonium chloride solution and the reverse extraction of the last step are subjected to ammonia absorption, and an organic phase extraction agent P507 after washing enters a next circle for usage. The method further improves the ammonia nitrogen recovery rate, the work environment is improved, and the production cost is reduced.

The invention provides an ammonia recycling method and a system in APT production process. The ammonia recycling method comprises following steps: 1, APT crystallization steam is discharged using a centrifugation blower fan, is introduced into a rectifying tower for rectification and condensation of ammonia tail gas to remove most water, and is introduced into a heat exchanger; 2, a three stage solution obtained via ion exchange is directly used for preparing a desorption agent, the rest ammonia nitrogen wastewater is pumped into a stirring tank, an alkali is added for ammonia activation, andgenerated ammonia tail gas is introduced into the heat exchanger; wastewater obtained via ammonia activation is pumped into an air stripping tower, and ammonia tail gas obtained via air stripping is introduced into the heat exchanger; when the ammonia-nitrogen value of obtained air stripping wastewater is detected to be qualified, discharging through a branch pipe is carried out, otherwise, the wastewater is pumped into the air stripping tower for air stripping; and 3, the temperature of the ammonia tail gas is reduced to be lower than 45 DEG C after treatment using the heat exchanger, the ammonia tail gas is introduced into a hydrochloric acid absorbing tower for circulating absorption, and an obtained solution is sent back to the main treatment stream directly for preparation of the desorption agent. The ammonia recycling method and the system are used for comprehensive treatment of ammonia nitrogen wastewater waste gas obtained in tungsten smelting, waste is changed into valuables,the method flow is simple, operation is convenient, the method is easy to control, and cost is low.

The invention discloses a method for preparing regenerated polyester by closed-loop recovery of waste polyester with typical green and low-carbon characteristics. The method comprises the steps: selecting a specific depolymerization catalyst to depolymerize waste polyester under a microwave condition; removing a polyol solvent from the depolymerized product, and purifying to remove byproducts to obtain a depolymerized monomer; and mixing the depolymerized monomer with dibasic acid, polyol, a polymerization catalyst and a chain extender, carrying out esterification reaction, adding a stabilizer and a catalyst, and carrying out polycondensation to obtain the regenerated polyester. According to the method, the depolymerization temperature is low, the efficiency is high, the dosage of the polyol solvent is small, and the content of the byproducts is extremely low; meanwhile, the depolymerization catalyst does not need to be separated, co-esterification of the regenerated polyester can be directly carried out, and no adverse effect is caused on the performance of the prepared regenerated polyester. The method provided by the invention can realize closed-loop recovery of waste polyester.

The invention relates to a green cyclic utilization method of a honeycomb type denitration catalyst, and belongs to the field of flue gas denitration and material cyclic utilization. A regeneration process route and a repreparation process route are set, and a regeneration production line and a repreparation production line are arranged in parallel; a regeneration process or a repreparation process is selected according to the performance of the waste honeycomb type denitration catalyst for green cyclic utilization; and the selection basis of the regeneration process and the repreparation process is as follows: if the axial compressive strength and the radial compressive strength of the waste honeycomb type denitration catalyst are respectively greater than or equal to 1.0 MPa and greaterthan or equal to 0.2 MPa, and the specific surface area is greater than or equal to 40.0 m<2>/g, the regeneration process route is selected, and otherwise, the repreparation process route is selected.According to the green cyclic utilization method of the honeycomb type denitration catalyst, regeneration and repreparation processes are combined, valuable components in the waste denitration catalyst are fully utilized, the use amount of water is greatly reduced, and closed-loop cyclic utilization of the denitration catalyst can be realized.

The invention relates to a method and a device for recycling a hot-dip copper waste liquid. The method comprises the following steps: feeding a waste liquid in a plating solution tank into an oxidation tank, adding hydrogen peroxide into the oxidation tank, adding compressed air into the oxidation tank, stirring 4-6 times to recover the pressure of a gas part at the upper portion of the oxidation tank to normal pressure, adding copper oxide into the oxidation tank, adjusting the pH value of the solution to 3.5-4, keeping for 8-10 hours, draining back the clear liquid in the oxidation tank to the plating solution tank, and after the residual turbid liquid in the oxidation tank is stirred for 8-10 minutes, making the turbid liquid flow into a turbid liquid recycling tank; and after the turbid liquid is subjected to solid-liquid separation, pumping the liquid into the plating solution tank to be reused, and recovering and storing the solid after being dried or air-dried. According to the invention, a copper plating enterprise can remove excessive ferrous ions in a waste liquid on site in a copper plating place by using simple equipment, a convenient process and low cost, copper ions in the waste liquid are recycled, and the ferrous ions are finally converted into a chemical raw material ferric hydroxide, so that closed-loop recycling is realized, high sewage treatment cost is saved for the enterprise, and considerable profits can be earned for enterprises due to cost difference.

The invention relates to a cutting mechanism for crop topping, a topping mechanism and a topping vehicle. The cutting mechanism comprises a recycling plate and a mounting plate, wherein the mounting plate is vertically arranged; a plurality of nozzles are fixedly arranged on the mounting plate; the plurality of the nozzles are sequentially arranged along a vertical direction; ejection directions of the plurality of the nozzles are parallel to one another; the nozzles communicate with a pressure water source respectively; the plurality of the nozzles are separately opened and closed to enable nozzles at set heights to eject pressure water; and cotton top cores at set heights can be removed through impact of the pressure water. Positions of the recycling plate and the mounting plate are relatively fixed, a liquid recycling groove is formed in the recycling plate, the liquid recycling groove is arranged facing to the nozzles, and the liquid recycling groove is capable of collecting the pressure water ejected out from the nozzles.