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1414 results about "Coprecipitation" patented technology

In chemistry, coprecipitation (CPT) or co-precipitation is the carrying down by a precipitate of substances normally soluble under the conditions employed. Analogously, in medicine, coprecipitation is specifically the precipitation of an unbound "antigen along with an antigen-antibody complex".

Method of forming nanoparticles and microparticles of controllable size using supercritical fluids and ultrasound

The current invention, Supercritical Antisolvent Precipitation with Enhanced Mass Transfer (SAS-EM) provides a significantly improved method for the production of nano and micro-particles with a narrow size distribution. The processes of the invention utilize the properties of supercritical fluids and also the principles of virbrational atomization to provide an efficient technique for the effective nanonization or micronization of particles. Like the SAS technique, SAS-EM, also uses a supercritical fluid as the antisolvent, but in the present invention the dispersion jet is deflected by a vibrating surface that atomizes the jet into fine droplets. The vibrating surface also generates a vibrational flow field within the supercritical phase that enhances mass transfer through increased mixing. Sizes of the particles obtained by this technique are easily controlled by changing the vibration intensity of the deflecting surface, which in turn is controlled by adjusting the power input to the vibration source. A major advantage of the SAS-EM technique is that it can be successfully used to obtain nanoparticles of materials that usually yield fibers or large crystals in SAS method. Microencapsulation via coprecipitation of two or more materials can also be achieved using the SAS-EM technique.
Owner:UNIV AUBURN

Full-component resource reclamation method for waste positive electrode materials of lithium ion batteries

The invention provides a full-component resource reclamation method for waste positive electrode materials of lithium ion batteries. The method comprises the following steps: 1) separating active substances and aluminum foils in waste positive electrode materials of lithium ion batteries by using an aqueous solution of fluorine-containing organic acid and carrying out liquid-solid-solid separation so as to obtain leachate, the lithium-containing active substances and the aluminum foils; 2) respectively carrying out high temperature roasting and impurity removal with alkali liquor on the lithium-containing active substances; 3) respectively carrying out recovery of the fluorine-containing organic acid through addition of acid and distillation, deposition of impurity ions through addition of alkali and ammonium carbonate coprecipitation on the leachate so as to prepare nickel-cobalt-manganese carbonate ternary precursor; and 4) carrying out component regulation on a mixture of the treated active substances and the nickel-cobalt-manganese carbonate ternary precursor, adding lithium carbonate in a certain proportion and carrying out high temperature solid phase sintering so as to prepare a lithium nickel cobalt manganese oxide ternary positive electrode material. The method provided in the invention has the following advantages: the application scope of the method is wide; separation efficiency of the lithium-containing active substances and the aluminum foils is high; short-flow direct re-preparation of positive electrode materials in waste lithium ion batteries is realized; and the method is applicable to large-scale resource reclamation of waste lithium ion batteries.
Owner:INST OF PROCESS ENG CHINESE ACAD OF SCI

Active material for lithium secondary battery, lithium secondary battery, and method for producing the same

ActiveUS20100233542A1Decrease in battery performanceSufficient discharge capacityBatteries circuit arrangementsElectrode manufacturing processesX-rayCrystal structure
The present invention provides an active material for a lithium secondary battery with a high discharge capacity, particularly for a lithium secondary battery that can increase the discharge capacity in a potential region of 4.3 V or lower, a method for producing the same, a lithium secondary battery having a high discharge capacity, and a method for producing the same. The active material for a lithium secondary battery includes a solid solution of a lithium transition metal composite oxide having an α-NaFeO2 type crystal structure, in which the composition ratio of Li, Co, Ni, and Mn contained in the solid solution satisfies Li1+(1/3)xCo1−x−yNi(1/2)yMn(2/3)x+(1/2)y (x+y≦1, 0≦y and 1−x−y=z); in an Li[Li1/3Mn2/3]O2(x)-LiNi1/2Mn1/2O2(y)-LiCoO2(z) type ternary phase diagram, (x, y, z) is represented by values in a range present on or within a line of a heptagon (ABCDEFG) defined by the vertexes; point A(0.45, 0.55, 0), point B(0.63, 0.37, 0), point C(0.7, 0.25, 0.05), point D(0.67, 0.18, 0.15), point E(0.75, 0, 0.25), point F(0.55, 0, 0.45), and point G(0.45, 0.2, 0.35); and the intensity ratio between the diffraction peaks on (003) plane and (104) plane measured by X-ray diffractometry before charge-discharge is I(003)/I(104)≧1.56 and at the end of discharge is I(003)/I(104)>1. The invention provides a method for producing the active material for a lithium secondary battery using a coprecipitation method, a lithium secondary battery including a positive electrode containing the active material and a method for producing the lithium secondary battery.
Owner:GS YUASA INT LTD

High-density small-particle-size nickel-cobalt-manganese hydroxide and preparing method thereof

The invention relates to a high-density small-particle-size nickel-cobalt-manganese hydroxide and a preparing method thereof. The nickel-cobalt-manganese hydroxide and the preparing method thereof are characterized in that: the general chemical formula of the nickel-cobalt-manganese hydroxide is NixCoyMnz(OH)2, wherein the sum of the x, the y and the z is 1, the x is not more than 0.8 and not less than 0.3, the y is not more than 0.4 and not less than 0.1, and the z is not more than 0.4 and not less than 0.1. The nickel-cobalt-manganese hydroxide is provided, so that problems of small-particle-size nickel-cobalt-manganese hydroxides prepared by methods at present, namely nonuniform element distribution, poor particle appearance, loose surfaces, difficult particle size control, nonuniformity, low tap density, and the like are overcome. A complexing control crystallization coprecipitation method is adopted. By a special technical process of producing nucleuses, growing, and subjecting particles to continuous frictional collision under a continuously increased solid liquid ratio, an aqueous solution of a nickel-cobalt-manganese soluble salt and an aqueous sodium hydroxide solution are subjected to coprecipitation under complexing of ammonia to obtain the small-particle-size nickel-cobalt-manganese hydroxide having characteristics of uniform element distribution, good degree of sphericity, uniform particle size distribution and high tap density.
Owner:宁夏中色金辉新能源有限公司

Method for preparing corrosion inhibition anion intercalated layered double hydroxides/oxide composite material and application

The invention provides a corrosion-inhibiting anionic intercalated hydrotalcite/nano oxide composite material, a preparation method thereof and application of the corrosion-inhibiting anionic intercalated hydrotalcite/nano oxide composite material. The preparation method is as follows: corrosion-inhibiting anions are directly inserted between hydrotalcite layers by the one-step coprecipitation method and the roasting restoring method; the nano oxide is generated by means of in situ synchronization during the process of generation of hydrotalcite crystals by controlling the mixture ratio of divalent metal ions to trivalent metal ions, the pH value of a reaction solution and the reaction temperature; and the corrosion-inhibiting anionic intercalated hydrotalcite/nano oxide composite material with the anti-corrosive function is prepared. The invention is mainly characterized in that the in situ preparation method for the hydrotalcite/oxide composite material provided with a nano lamellar structure improves the release amount of a corrosion inhibitor and reduces the water absorption of a coating by leading into the corrosion inhibitor with the anti-corrosive function and the nano oxide which is generated in situ during the reaction process. The composite material can be used to be pigment of an anti-corrosive metallic coating system, and particularly has potential application value in improving the anti-corrosive performance of a magnesium alloy anti-corrosive coating.
Owner:HARBIN ENG UNIV

Acid-resistant magnetic chitosan microspheres as well as preparation method and application thereof

The invention relates to an acid-resistant magnetic chitosan microsphere adsorbent as well as a preparation method and the application thereof, and in particular relates to acid-resistant magnetic chitosan microspheres which have the excellent absorption performance and recycling performance for acid waste water containing hexavalent chromium, a preparation method of the acid-resistant magnetic chitosan microspheres and the application of the acid-resistant magnetic chitosan microspheres. The preparation method of the acid-resistant magnetic chitosan microspheres comprises the following steps: (1) preparing Fe3O4 nano-particles modified by citric acid by using a coprecipitation method; (2) preparing single-coated magnetic SiO2 nano-particles by using a sodium silicate hydrolysis method or a sol-gel method; and (3) preparing the chitosan microspheres coated with magnetic SiO2 by taking chitosan powder as a raw material by adopting an emulsion crosslinking method. Furthermore, in order to further improve the adsorbing capacity of the microspheres, in the method, dendritic polyethylene imine is taken as a functional group for modifying the adsorbent, so that the modified chitosan microspheres can be obtained. The magnetic chitosan microspheres prepared by adopting the method not only have the excellent acid resistance, but also have the good absorption performance on Cr (VI) ions.
Owner:INST OF PROCESS ENG CHINESE ACAD OF SCI

Method for preparing hydrogenation catalyst composite

The invention discloses a method for preparing a hydrogenation catalyst composite, comprising the following steps of: (1) preparing a NixWyOz composite oxide precursor by using a coprecipitation method; (2) pulping, mixing and filtering the NixWyOz composite oxide precursor and MoO3; and (3) forming and activating the NixWyOz composite oxide precursor and the MoO3 to form a final catalyst, wherein the process of manufacturing the NixWyOz composite oxide precursor comprises the steps of: preparing acid solution A containing an active metal Ni component according to a component content proportion of the catalyst; preparing solution B containing an active metal W component according to the component content proportion of the catalyst; merging the solution A and the solution B, and adding the mixture of the solution A and the solution B into a reaction tank to gelatinize; and generating a deposited mixture to obtain the precursor containing the composite oxide NixWyOz. The catalyst prepared by the method has the advantages of uniform dispersion of metals, high use performance, and particularly higher activity for deep impurity removal process of hydrocarbon. The method is simple and convenient, and has low metal loss. The method is mainly used for preparing a bulk phase catalyst with higher metal content.
Owner:CHINA PETROLEUM & CHEM CORP +1

Curing agent and curing method for heavy metals in fly ash from mswi (municipal solid waste incineration)

The invention provides a curing agent and a curing method for heavy metals in fly ash from mswi (municipal solid waste incineration). The curing agent comprises an aluminum-rich high-silicon material and an alkaline exciting agent, wherein the mass of the aluminum-rich high-silicon material is 15% to 25% of the mass of the fly ash from mswi; the mass of the alkaline exciting agent is 3% to 5% of the mass of the fly ash from mswi. The curing agent adopts industrial waste residues, and raw materials are cheap and easy to obtain; according to the curing method, lots of calcium oxide, chloride and sulfide existing in the fly ash from mswi have a hydration reaction with the aluminum-rich high-silicon material to generate a C-S-H (calcium silicate hydrate), Friedel (calcium chloroaluminate) phase and Aft (ettringite) phase system; during the formation process of the mineral system, a solid solution is formed through ion exchange, a new phase is formed through coprecipitation, and a relatively strong stable constraint effect can be played on heavy metals through physical adsorption and coating, so that wastes can be treated by using wastes, and harmless treatment of the fly ash from mswi and resource utilization of the industrial waste residues are realized.
Owner:CHINA CITY ENVIRONMENT PROTECTION ENGINEERING LIMITED COMPANY

High-activity amorphous silica-alumina, hydrocracking catalyst supported by amorphous silica-alumina, and preparation methods thereof

The invention discloses a high-activity amorphous silica-alumina, a hydrocracking catalyst supported by amorphous silica-alumina, and preparation methods thereof. The preparation method of the amorphous silica-alumina supporter comprises the following steps: preparing a silicon source-aluminum source mixed water solution, mixing the mixed water solution with a precipitant solution, carrying out cocurrent flow coprecipitation to obtain a precipitated slurry, transferring the slurry into a closed vessel, aging, molding, and roasting. The invention also provides a preparation method of a hydrocracking catalyst by using the amorphous silica-alumina as the supporter. The preparation method of the hydrocracking catalyst is as follows: in the preparation method of the amorphous silica-alumina supporter, a nickel salt or nickel salt and metal aid M salt is/are added into the silicon source-aluminum source mixed water solution in the step (1), and the rest steps are the same as those in the preparation method of the amorphous silica-alumina supporter. The coprecipitation process is adopted in the preparation process, and the silicon source and aluminum source finally exist in the catalyst in the form of the amorphous silica-alumina, but the catalyst has much higher activity than the common amorphous silica-alumina catalyst.
Owner:SYNFUELS CHINA TECH CO LTD

Doped monocrystal multi-component material for lithium ion batteries and preparation method of such doped monocrystal multi-component material

The invention belongs to the technical field of anode materials for lithium ion batteries and particularly discloses a doped monocrystal multi-component material for lithium ion batteries and a preparation method of such doped monocrystal multi-component material. The doped monocrystal multi-component material and the preparation method thereof have the advantages that nickel-cobalt-manganese ternary materials are modified, and M-source metals are doped when a precursor is prepared to decrease the material sintering temperature and improve material tapping density, so that the mixed arrangement degree of Ni<2+> in a Li<+> layer is weakened obviously; through high-temperature sintering and tempering processes, the precursor of the multi-composite material, prepared through a coprecipitation method, is more stable in crystal structure, metal ions in the material are inhibited from dissolving through surface coating, side reaction between the metal ions and electrolyte is inhibited, and stability and electrochemical performance of an active material are further enhanced; a doped monocrystal multi-component material finished product is stable in crystal structure, high in safety and compaction density and excellent in rate capability and cycle performance, so that specific capacity and charge-discharge voltage of the material are further enhanced; the preparation method is small in doping quantity, simple to operate, easy to control, widely applicable and suitable for large-scale production.
Owner:烟台卓能锂电池有限公司

Method for preparing ternary material precursor and recovering lithium by using spent lithium-ion battery ternary cathode materials

The invention belongs to the technical field of ternary material precursor preparation, and particular to a method for preparing a ternary material precursor and recovering lithium by using spent lithium-ion battery ternary cathode materials. Spent lithium-ion battery anode materials are roasted and screened to obtain ternary anode materials and aluminum foil; the ternary anode materials are leached out of a caustic soda solution and filtered to obtain filtrate and filter residues; carbonate is added to the filtrate to react to obtain lithium carbonate solid; the filter residues are leached with volatile acid; a reducing agent is added to the leaching solution and the volatile acid is removed by heating the solution to a boil; the molar ratios of nickel, cobalt and manganese in leaching solution are adjusted; and the leaching solution after adjusting the molar ratios of the nickel, the cobalt and the manganese is flow into a reaction kettle containing an ammonia water solution togetherwith the ammonia water solution and caustic solution, and coprecipitation is performed under inert gas protection. The method for preparing the ternary material precursor and recovering the lithium by using the spent lithium-ion battery ternary cathode materials realizes the preparation of the ternary material precursor and the recovery of the lithium at the same time, the production cost is reduced, product quality is high, economy is good, and the directional circulation of nickel-cobalt-manganese lithium resources is realized.
Owner:SHANDONG UNIV OF TECH
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