114results about "Crystallization separation" patented technology

Single-stage and multi-stage systems and methods for the recovery of critical elements in substantially pure form from lithium ion batteries are provided. The systems and methods include supported membrane solvent extraction using an immobilized organic phase within the pores of permeable hollow fibers. The permeable hollow fibers are contacted by a feed solution on one side, and a strip solution on another side, to provide the simultaneous extraction and stripping of elements from dissolved lithium ion cathode materials, while rejecting other elements from the feed solution. The single- and multi-stage systems and methods can selectively recover cobalt, manganese, nickel, lithium, aluminum and other elements from spent battery cathodes and are not limited by equilibrium constraints as compared to traditional solvent extraction processes.

A method for recovering lithium bis(fluorosulfonyl)imide is provided in the present application. The method of the present application comprises: mixing a slag from lithium bis(fluorosulfonyl)imide production process with a solvent of carbonate ester, to obtain a mixed material; subjecting the mixed material to solid-liquid separation, to obtain a discharged liquid and a solid slag; monitoring the chromaticity of the discharged liquid and comparing the chromaticity of the discharged liquid with a chromaticity reference; recycling the discharged liquid to the mixed material, if the chromaticity of the discharged liquid is higher than the chromaticity reference; and recycling the discharged liquid to lithium bis(fluorosulfonyl)imide production process, if the chromaticity of the discharged liquid is lower than or equal to the chromaticity reference.

Provided herein are method of recycling metallic ion content from inorganic solid and systems thereof. The methods and systems include contacting inorganic solid with an acid to produce said concrete precursors.

A high-salinity wastewater salt recovery and wastewater reuse device comprises a separation tank and a drying assembly, three sets of supporting columns are fixedly installed on the outer side of the separation tank, the drying assembly is installed among the three sets of supporting columns, an oil extraction mechanism is installed in the separation tank, a scraping mechanism is installed in the separation tank, and the oil extraction mechanism is connected with the scraping mechanism. And the scraping mechanism comprises a gear ring, the gear ring is rotationally connected to the interior of the separation tank, and the lower end of the gear ring is fixedly connected with two sets of scraping plates. By arranging the oil extraction mechanism and utilizing the buoyancy principle of the floating barrel, effective separation of grease and light components in the high-salinity wastewater is achieved, due to the design, the oil separation efficiency is improved, pollution of oil to the purity of follow-up crystallized salt is avoided, and therefore the high quality of the crystallized salt is ensured; the filtering box can be conveniently overturned and inclined, and filtered impurities are poured into the collecting box, so that the automatic cleaning of the filtering mechanism is realized.

The present invention relates to a plant for purifying a crude composition by crystallization, wherein the plant comprises at least one crystallizer, at least one buffer vessel and at least two heat pumps, wherein each of at least two heat pumps is connected with at least one buffer vessel, as well as to a process for purifying a crude composition by crystallization being performed in such a plant.

The method for isolating a lithium precursor according to the embodiment of the present application includes the steps of preparing a primary precursor mixture including a primary lithium precursor and a primary transition metal precursor, mixing the primary precursor mixture with a precipitation solution in a reactor to form a precursor mixture, and injecting a non-reactive gas into the precursor mixture. Accordingly, the lithium precursor can be isolated with high purity and high efficiency.

The invention relates to the technical field of chemical engineering, and provides a calcium chloride and magnesium chloride production device and a production method for preparing calcium chloride and magnesium chloride from dolomite, and the production device comprises a pretreatment assembly, a first-stage reaction kettle and a second-stage reaction kettle which are connected in sequence. The second-stage reaction kettle comprises a tank body, a first outlet formed in the upper part of the tank body and a second outlet formed in the bottom of the tank body. The first outlet is sequentially connected with a water washing tower, a drying device and an evaporation condenser. The second outlet is sequentially connected with a reduced-pressure evaporator, a low-temperature crystallizer, a horizontal centrifuge, a purification tank and a normal-pressure evaporator. The pretreatment assembly, the first-stage reaction kettle and the second-stage reaction kettle are sequentially arranged, so that gradient control over the reaction process is achieved, it is ensured that the acidolysis reaction is more thorough, the chemical purity of calcium chloride and magnesium chloride is improved, precise separation of gaseous impurities and liquid impurities is ensured, and the purification rate of a final product is further increased.

Solutions and methods are disclosed for the extraction and quantification of cellulose derived from cellulosic biomass samples. Improved extraction yields and selectivities are provided through the use of an extraction solvent mixture comprising an aprotic solvent such as DMSO, a quaternary ammonium salt such as TBAF, and an quaternary ammonium base such as TBAOH. The extracted cellulose can be optionally precipitated using disclosed precipitation solutions to further improve cellulose purity. Extracted cellulose can be measured by hydrolyzing the cellulose to glucose or cellobiose, or by using disclosed spectrophotometric assays of cellulose-salt complexes.

The present disclosure relates to a method of carbon dioxide mineralisation, the method comprising: treating a material, such as a mineral, with carbon dioxide and a base, wherein the treatment occurs in solution phase, the material comprising: a first cation that is Ca or Mg; a second cation which is not Ca and or Mg; and one or more anions which are not carbonate; such that a product solution comprising an acid or a salt of the base and one of the one or more anions and a salt of the second cation and one of the one or more anions is formed, and a carbonate salt of the first cation is caused to precipitate.

A method for recycling an anode material includes a step (a) of loading a heat treatment object including the anode material into a heat treatment furnace, a step (b) of raising an internal temperature of the heat treatment furnace to increase to a range of about 100° C. to about 400° C., a step (c) of heat-treating the heat treatment object at the increased temperature, and a step (d) of discharging first powder made after the heat treatment of the heat treatment object is completed. The first powder includes recycled anode powder selected from the group consisting of recycled carbon powder, silicon powder, silicon oxide powder, carbon-silicon composite material powder, or combinations thereof, and the heat treatment object includes at least a portion of a waste lithium-ion secondary battery or wastes generated during a process of manufacturing the lithium-ion secondary battery or a process of manufacturing the anode material.

A simultaneous desiliconization and defluorination wastewater advanced treatment device and method are disclosed. This invention relates to a precipitation device and method for removing silicon and fluoride from water, aiming to solve the technical problems of low silicon removal efficiency, large amounts of added chemicals, complex operation, and high cost of existing silicon removal methods. The device of this invention is a pool with a central baffle dividing the pool into a coagulation zone and a sedimentation zone. A stirrer, a first spiral heating tube, and a first inclined plate are installed in the coagulation zone; a second inclined plate, a filter device, and a second spiral heating tube are installed in the sedimentation zone; an electro-adsorption device is installed at the lower end of the baffle. Wastewater treatment method: Wastewater containing silicon and / or fluoride is introduced into the coagulation zone, sodium aluminate and a coagulant are added, and heating and stirring are performed for coagulation and sedimentation. After electro-adsorption flocculation and sedimentation by the electro-adsorption device, the wastewater enters the sedimentation zone for enhanced sedimentation, overflows, and the treatment is completed. The silicon removal rate reaches 92%–98%, and the fluoride removal rate is higher than 71.43%. It can be used in the field of wastewater treatment.

The utility model relates to the technical field of chemical equipment, and discloses a chemical reaction crystallization device convenient to maintain, which comprises a crystallization kettle body, a jacket, an end cover and a stirring component, the jacket is fixedly sleeved outside the crystallization kettle body, a cooling water cavity is formed between the crystallization kettle body and the jacket, the bottom side of the jacket is fixedly provided with a bottom frame, and the end cover is arranged on the bottom frame. The end cover is fixedly provided with a motor through a connecting frame, a driving shaft of the motor is fixedly connected with an assembly seat, the stirring component comprises a stirring shaft and two stirring blades, the two stirring blades are fixedly connected outside the stirring shaft in a sleeving manner at intervals, the stirring shaft penetrates through the end cover, the assembly seat is slidably connected to the end part of the stirring shaft in a sleeving manner, and the stirring shaft is fixedly connected with the assembly seat. Two T-shaped studs are symmetrically connected between the stirring shaft and the assembling base in a threaded mode, the stirring component is convenient to disassemble and assemble, and therefore the stirring component which is corroded and abraded can be replaced conveniently, and the later maintenance convenience of the device can be improved.

The present invention relates to a method for recycling polyurethanes from a composition comprising an elastomeric polyurethane (PU1) and at least one further material, the method comprising the steps of providing a composition (CW) comprising a polyurethane (PU1) and at least one further material, and contacting the composition (CW) with a solvent mixture (SM) comprising at least one alcohol and at least one compound (A1) selected from the group consisting of cyclic amides, at a temperature below the boiling point of the alcohol, to obtain a solution (S1) rich in dissolved polyurethane (PU1). The invention also relates to the polyurethanes obtained or obtainable by said method, as well as to the use of the polyurethanes according to the invention for preparing molded articles.

The invention provides a water pollution treatment device and a method for extracting lithium from lepidolite and recovering sodium sulfate. Relates to the field of water pollution treatment, in particular to a water pollution treatment device which comprises an evaporation crystallizer arranged on the ground. According to the water pollution treatment device and the method for extracting lithium from lepidolite and recovering sodium sulfate, three-time washing sewage is used as a cooling medium, water vapor generated by the evaporation crystallizer is converted into pure water through low-temperature condensation, and cyclic utilization of the pure water is achieved while sewage treatment is conducted; the third-time washing sewage absorbs heat in the water vapor condensation process to achieve preheating, the energy efficiency is improved, efficient potassium sulfate recovery is achieved, dependence on external raw materials is reduced, and the economic benefits are improved, the third-time sewage is input into an evaporation crystallizer or a mixing box through an electromagnetic valve, and the concentration of a third-time near-pure water washing sewage solution is extremely low; evaporation is carried out after washing sewage is mixed, and the problems that violent bumping easily occurs due to direct evaporation, heat transfer is unstable, and effective crystals are difficult to form are avoided.

This invention relates to the field of wastewater treatment, and discloses an anti-precipitation and crystallization device for a wet flue gas desulfurization wastewater treatment system. The device includes a vessel body with an inlet, an outlet, and a drain. The vessel body is equipped with a disturbance mechanism and a heating mechanism. A deformable pad is laid at the bottom of the vessel body, and a slag discharge pipe is located at the center of the bottom. The middle part of the deformable pad is fixedly fitted onto the slag discharge pipe. The edge of the deformable pad is driven to rise and fall by a lifting mechanism. During the rising and falling process, the precipitated crystals adhering to the deformable pad are lifted and discharged from the slag discharge pipe. The anti-precipitation and crystallization device for a wet flue gas desulfurization wastewater treatment system provided by this invention achieves crystal detachment by the rising edge of the deformable pad, relying on the deformation of the pad and the slag discharge by gravity. This eliminates the need for a dedicated slag discharge mechanism, and the disturbance mechanism also does not require a lifting system, making the overall equipment more simplified.

The invention relates to a method in which xylitol is heated until liquified, to be added to hydroxyapatite and zinc citrate, the mixture subsequently being subjected to a process of controlled crystallisation. This produces crystals for dental care with active agents that maximise the bioactive effect of same in the mouth, the crystals also providing slow and controlled release of the active agents, thereby increasing effectiveness in comparison with conventional forms of application. In summary, the invention represents a significant advance in dental care technology. It not only improves the therapeutic efficacy of the hydroxyapatite and zinc citrate through innovative release technology, but also increases patient acceptance and environmental sustainability.

The present disclosure relates to a hydrometallurgical recovery method for nickel sulfate. More specifically, the present disclosure relates to a hydrometallurgical nickel sulfate recovery method in which a wet smelting process is used to extract a high-purity nickel sulfate aqueous solution from a raw material containing nickel (Ni), cobalt (Co), and manganese (Mn). In the method, sodium hydroxide or sodium carbonate is not used as a neutralizer but nickel hydroxide is used, which prevents salts of impurities from being generated as a precipitate in a solvent extraction process, thereby increasing process efficiency of the solvent extraction process.

The application discloses a garbage power plant leachate zero emission and compressed air making system and method, which comprises a garbage incineration boiler, a flue gas heat exchanger, a steam turbine, an air compressor, a waste heat heat exchanger, a steam air preheater, a wastewater evaporation pretreatment pool and a waste heat evaporation crystallizer, the garbage incineration boiler is communicated with the flue gas heat exchanger, the air compressor, the waste heat heat exchanger and the steam air preheater, the waste heat evaporation crystallizer is communicated with the steam turbine, the air compressor, the waste heat heat exchanger, the steam air preheater and the wastewater evaporation pretreatment pool, and the steam turbine is communicated with the flue gas heat exchanger and the air compressor. The garbage power plant waste heat utilization, leachate zero emission and compressed air system are organically coupled, the waste heat of tail flue gas is reasonably utilized, the steam generated by the waste heat evaporation crystallizer is used to preheat the combustion-supporting air of the garbage incineration boiler, the garbage incineration power station waste heat utilization is realized, the whole plant energy efficiency is improved, and the efficient and economic operation of the whole garbage power generation system is realized.

Disclosed in the present invention is a recovery method for a flame-retardant polyester. The recovery method of the present invention includes the following step: determining the flame-retardant polyester to be a polyester A or a polyester B according to the type of a flame retardant, wherein the polyester A is a polyester in which the flame retardant is one or more of decabromodiphenyl ethane, decabromodiphenyl ether, hexabromocyclododecane, and brominated epoxy; the polyester B is a polyester in which the flame retardant is one or more of a phosphate flame retardant, tetrabromobisphenol A, tetrabromobisphenol S, and brominated polycarbonate; the polyester A is first subjected to microwave alcoholysis and then subjected to extraction treatment to recover the flame retardant; and the polyester B is first subjected to extraction treatment to recover the flame retardant, and then subjected to microwave alcoholysis to recover the polyester. According to the recovery method of the present invention, not only is the flame retardant in the flame-retardant polyester efficiently recovered, but also a filler and other impurities can be separated from recovered resin, so that all components in the flame-retardant polyester are comprehensively recovered, and efficient cyclic utilization of the flame-retardant polyester is achieved.

A hydrometallurgical process for the selective recovery of silver from a solid waste material, said solid waste material deriving from waste electrical and electronic equipment and / or from exhausted Ag-based catalysts, comprises the following steps: I) Subjecting said solid material to acid leaching to dissolve said silver by using a leaching solution, wherein said leaching solution is an aqueous solution of sulphuric acid, ferric sulphate and thiourea (H2SO4-Fe2(SO4)3-CH4N2S), said subjecting to acid leaching being carried out at ambient temperature and at atmospheric pressure, in a single stage or in multiple stages; filtering the exiting leaching solution and subjecting the residual solid material to washing with water; wherein said sulphuric acid, said ferric sulphate and said thiourea are contained in said leaching solution at the following concentrations: sulphuric acid 0.1-0.5 M; ferric sulphate 10-40 g / L; thiourea 10-40 g / L; II) Recovering said water used during said washing in said step I, replenishing said water with said sulphuric acid, said ferric sulphate and said thiourea and, when said subjecting to acid leaching is carried out in multiple stages, using said water as a leaching solution in said multiple stages, wherein said replenishing said water comprises adding said sulphuric acid, said ferric sulphate and said thiourea according to the following percentages compared to the dosage thereof in said step I: sulphuric acid 10-50%; ferric sulphate 80-100%; thiourea 25-50%; III) Subjecting said leaching solution exiting from said step I to electrolysis under stirring to recover said silver as metallic silver at the cathode and regenerate said thiourea; recovering said leaching solution at the end of said electrolysis; IV) Replenishing said leaching solution recovered at the end of said electrolysis in said step III con said sulphuric acid, said ferric sulphate and said thiourea, and, after said replenishing, reusing said leaching solution to treat a new solid waste material.

The invention belongs to the technical field of fine chemical engineering and environmental protection, and particularly relates to a system and method for catalytically synthesizing calcium formate by purifying carbon monoxide from yellow phosphorus tail gas. The system comprises a yellow phosphorus tail gas purification unit, a catalytic slurry preparation unit and a calcium formate synthesis refining unit. The method comprises the following steps: carrying out alkali washing, catalytic hydrolysis and dry desulfurization on yellow phosphorus tail gas, and carrying out simplified pressure swing adsorption to obtain an industrial-grade CO product gas; the method comprises the following steps: performing efficient synthesis on CO product gas and calcium hydroxide slurry containing an insoluble immobilized bifunctional catalyst in an airlift loop reactor under the conditions that the pressure is 3.5-7.0 MPa and the temperature is 110-170 DEG C; and recovering the catalyst from the reaction slurry through a hydrocyclone and a filter press in two steps, and refining the filtrate to obtain calcium formate. Through innovative matching of low-cost combined purification and efficient immobilized catalytic synthesis, the contradiction between high purification cost and low synthesis efficiency in the prior art is solved, the catalyst is easy and convenient to recycle, and the economical efficiency and industrial feasibility of the process are greatly improved.

Disclosed in the present invention is a recovery method for a flame-retardant polyester. The recovery method of the present invention includes the following step: determining the flame-retardant polyester to be a polyester A or a polyester B according to the type of a flame retardant, wherein the polyester A is a polyester in which the flame retardant is one or more of decabromodiphenyl ethane, decabromodiphenyl ether, hexabromocyclododecane, and brominated epoxy; the polyester B is a polyester in which the flame retardant is one or more of a phosphate flame retardant, tetrabromobisphenol A, tetrabromobisphenol S, and brominated polycarbonate; the polyester A is first subjected to microwave alcoholysis and then subjected to extraction treatment to recover the flame retardant; and the polyester B is first subjected to extraction treatment to recover the flame retardant, and then subjected to microwave alcoholysis to recover the polyester. According to the recovery method of the present invention, not only is the flame retardant in the flame-retardant polyester efficiently recovered, but also a filler and other impurities can be separated from recovered resin, so that all components in the flame-retardant polyester are comprehensively recovered, and efficient cyclic utilization of the flame-retardant polyester is achieved.

The object of this invention is to provide a method for economically and environmentally recovering negative electrode carbon powder from spent lithium-ion secondary batteries, the resulting recycled negative electrode carbon powder, and a lithium-ion secondary battery using the recycled negative electrode carbon powder. To achieve this object, the method for recycling negative electrode material includes: step (a) loading a heat-treated object containing negative electrode material into a heat treatment furnace; step (b) raising the internal temperature of the heat treatment furnace to approximately 100°C to approximately 400°C; step (c) heat-treating the heat-treated object at the raised temperature; and step (d) discharging a first powder generated after the heat treatment of the heat-treated object. The first powder comprises recycled negative electrode powder selected from recycled carbon powder, silicon powder, silicon oxide powder, carbon-silicon composite powder, or combinations thereof. The heat-treated object comprises at least a portion of a spent lithium-ion secondary battery, or waste generated during the manufacturing process of a lithium-ion secondary battery or during the manufacturing process of the negative electrode material.

Provided is a method for efficiently obtaining a solution containing nickel and / or cobalt from alloys containing nickel and / or cobalt and copper, such as waste lithium-ion batteries. The present invention pertains to an alloy treatment method for obtaining a solution containing nickel and / or cobalt from alloys containing nickel and / or cobalt and copper, the method comprising: a leaching step S1 in which an acid solution is added to the alloys in the presence of a sulfurizing agent to perform a leaching treatment and obtain a leachate and a leaching residue; and a cementation step S2 in which a reducing agent and a sulfurizing agent are added to the resulting leachate to perform a copper-removal treatment for sulfurizing at least copper contained in the leachate and obtain a post-copper removal solution and a copper-removed residue, wherein the copper-removed residue obtained through the copper-removal treatment in the cementation step S2 is repeatedly subjected to the leaching step S1 and subjected to a leaching treatment together with the alloys.

This invention utilizes mechanical vapor compression and / or thermal vapor compression, integrating compression loops across multiple process stages. A sequential network of compressors is used to increase the pressure and condensation temperature of vapor within each process stage as an internal vapor flow, and as an inter-vapor flow branching between process stages. Because available vapor is shared between compressor stages, the number of compressors can be reduced, improving economics. By separating vapor between compressor stages to balance the vapor mass flow rate across multiple process stages in the incremental compressor stages, the entire vapor compression system can be customized to individual process energy requirements and adapt to dynamic fluctuations in process conditions.

The invention provides efficient methods for extracting from microalgae biomass after astaxanthin extraction valuable biomaterials, including polysaccharides, that can be used as coatings (biofilms) and other applications. The method provided herein provides partial separation of biomaterials into fractions enriched in different materials, that increases the utility and value of the original biomass. Thus, the method herein provides at least a protein-enriched fraction, a polysaccharide-enriched fraction and a lignin-rich fraction. Thus, by the methods of the invention, a biomass source which is currently underutilised can be refined and processed into higher value products, leaving very little or no left-over residue material. The invention can advantageously be used for utilisation and valuation of left-over biomass after astaxanthin extraction from microalgae.

The present application relates to the technical field of separation and purification, and particularly relates to a method and system for melt crystallization. The method comprises: S1, cooling and crystallizing a material containing a target product to obtain crystalline crystals and a crystallization mother liquor; S2, aging and washing the crystalline crystals to obtain aged crystals, an aging mother liquor and a washing filtrate; S3, melting the aged crystals to obtain a molten material; wherein the aging mother liquor and / or the washing filtrate is divided into at least two parts, at least one part of which is returned to step S1 to be subjected to the cooling and crystallization, and at least one part of which is heated and then returned to step S2 to be subjected to the aging and washing. The method has the advantages of high product purity, high yield, low separation energy consumption and large operation flexibility.

The invention relates to a process for separating metals of interest from polymetallic samples. Especially, it relates to the separation of lithium and / or manganese from a polymetallic sample originating from end-of-life batteries. The process comprises a lithium leaching step in absence of mineral acid, a step of recovering lithium in a solid form, a step of forming manganese formate, and a step of recovering manganese in a solid form.