109 results about "Sodium oxalate" patented technology

The invention relates to the technical field of wave-absorbing materials, in particular to a preparation method of an MXene-NiO-PPy ternary composite wave-absorbing material. The invention provides a preparation method of an MXene-NiO-PPy ternary composite wave-absorbing material, which comprises the following steps of: etching titanium aluminum carbide powder through a LiF / HCl mixture, and performing ultrasonic stripping to prepare a uniform dispersion of MXene nanosheets; the preparation method comprises the following steps: dispersing MXene nanosheets in a solution of water and absolute ethyl alcohol, and adding a pyrrole monomer and a FeCl3. 6H2O aqueous solution for reaction; after the reaction, washing is performed to obtain a PPy-MXene composite material; the preparation method comprises the following steps: by taking NiCl2. 6H2O as a nickel source and sodium oxalate as a precipitator, preparing NiO nanowires by adopting a hydrothermal method combined with a calcining process; the invention discloses a preparation method of an MXene-NiO-PPy ternary composite wave-absorbing material.According to the method, the MXene-NiO-PPy ternary composite wave-absorbing material with rich heterogeneous interfaces and a porous micro-nano structure is constructed, cooperation of dielectric loss, magnetic loss and interface polarization loss is achieved, and finally the light, efficient and broadband wave-absorbing performance is obtained.

The present application relates to a sodium-ion battery precursor, a positive electrode material, a preparation method, and a use. A complexing agent solution used for preparing the sodium-ion battery precursor comprises a first complexing agent and a second complexing agent, wherein the first complexing agent comprises any one of or a combination of at least two of oxalic acid, sodium oxalate, or potassium oxalate, and the second complexing agent comprises any one of or a combination of at least two of citric acid, sodium citrate, or potassium citrate. In the present application, by providing the specific complexing agents, the prepared sodium-ion battery precursor has a relatively high specific surface area, thereby facilitating the intercalation of sodium ions when sintering and preparing a positive electrode material, so that the electrochemical performance of the sodium-ion battery positive electrode material can be significantly improved.

The invention belongs to the technical field of electrochemical energy storage, and particularly relates to a battery capable of supplementing lithium or sodium in situ, which comprises a positive plate, a negative plate and an electrolyte, and is characterized in that the electrolyte contains a component A, and a positive electrode and / or a negative electrode contains a component B; the structural general formula of the component A is X-Y, and X is lithium fluorosulfonate, sodium fluorosulfonate, lithium difluorophosphate or sodium difluorophosphate; y is boron trifluoride or phosphorus pentafluoride; the component B is at least one of lithium oxalate, sodium oxalate, lithium fluoride and sodium fluoride. Compared with the prior art, the component A and the component B are simultaneously added into the battery disclosed by the invention, so that the battery shows more excellent cycle performance and high-temperature performance. The combination mode has better performance compared with the mode that the component B is independently used in the electrode material or the component A is independently used in the electrolyte.

The invention discloses a water-based compensation sodium source sodium ion battery positive pole piece and a preparation method thereof. Mixing a positive active material, a conductive agent, a water-based binder, a water-soluble sodium supplement agent and a solvent to obtain positive slurry; wherein the water-soluble sodium supplement comprises sodium nitrite, sodium oxalate and sodium citrate; the solvent is water; and coating the surface of a current collector with the positive electrode slurry to prepare the positive electrode plate. Deionized water is used for replacing a traditional organic solvent to serve as a pulping solvent, and dual-function optimization is achieved by adding a specific water-soluble sodium supplementing agent. The sodium supplementing agent is uniformly distributed in the pole piece through a dissolution-recrystallization mechanism, and an efficient sodium ion pre-compensation system is formed. According to the method, the production cost and the energy consumption are remarkably reduced, the structural degradation of the positive active material in a water system environment can be effectively inhibited, irreversible sodium loss caused by formation of a first-week solid electrolyte interface (SEI) of a negative electrode is counteracted through a sodium source compensation mechanism, and the method has remarkable environmental friendliness and industrial application value.

The invention discloses a sodium-philic current collector and a negative-electrode-free sodium ion battery comprising the same. According to the sodium-philic current collector, carbon-coated aluminum foil is subjected to nitrogen plasma treatment, nitrogen doping sites are formed on a carbon-coated layer, the affinity to sodium can be enhanced, and uniform deposition of sodium is promoted; according to the electrolyte, a cosolvent of diethylene glycol dimethyl ether and tetraethylene glycol dimethyl ether is adopted, sodium hexafluorophosphate, sodium tetrafluoroborate and sodium trifluoromethanesulfonate are compounded, (3-fluorophenyl)-oxoacetonitrile and allyl methyl carbonate are added to serve as electrolyte additives, a weak solvation structure is formed, a solid electrolyte interfacial film rich in boron and fluorine is constructed, and side reactions are inhibited; sodium oxalate is added to the positive electrode as a sodium supplementing agent to make up the loss of active sodium caused by low first charge-discharge efficiency. The invention solves the problems of low first charge-discharge efficiency and poor dendritic crystal growth and cycle stability of the non-anode sodium ion battery, has high energy density and process simplicity, and is suitable for large-scale production.

An integrated energy system comprising a power plant configured to generate steam. The power plant can include a nuclear reactor and / or an electrical power generation system. A chemical products generation system can include a first reaction chamber receiving Sodium Formate (HCOONa) that, via insertion of a first portion of the steam at a first temperature, is decomposed into Sodium Oxalate ((COO)2Na2) and Hydrogen (H2), the steam including super-heated steam. The chemical products generation system can include a second reaction chamber receiving the Sodium Oxalate ((COO)2Na2) that, via insertion of a second portion of the steam at a second temperature, is decomposed into Sodium Oxide (Na2O), Carbon Monoxide (CO), and Carbon Dioxide (CO2). A syngas generation system can be operably coupled to the chemical products generation system and configured to generate a combination of the Hydrogen (H2), the Carbon Monoxide (CO), and / or the Carbon Dioxide (CO2), and / or to generate syngas.

An integrated energy system including a power plant is discussed herein. In some examples, the integrated energy system may include at least one nuclear reactor and electrical power generation system configured to generate steam and electricity, a water treatment plant configured to produce Sodium Hydroxide (NaOH) from salt water, a Sodium Formate (HCOONa) production plant configured to receive the Sodium Hydroxide (NaOH) to produce Sodium Formate (HCOONa), a Thermal Decomposition reactor configured to receive the Sodium Formate (HCOONa) and configured to receive at least a first portion of the steam or at least a second portion of the electricity from the power plant to indirectly heat the Thermal Decomposition reactor to produce Hydrogen (H2), Carbon Dioxide (CO2), and Carbon Monoxide (CO) from the Sodium Formate (HCOONa), and a Methanol (CH3OH) reaction chamber configured to receive the Hydrogen (H2), the Carbon Dioxide (CO2), and the Carbon Monoxide (CO) to produce Methanol (CH3OH).

The invention discloses a method for preparing tertiary amines using secondary amines as raw materials. The method comprises the steps of reacting secondary amines as raw materials with acids to generate proton-type ionic liquids, and reacting proton-type ionic liquids and aldehydes under the action of a reducing agent to generate tertiary amines. The secondary amines are fatty secondary amines and / or aromatic secondary amines and / or cyclic secondary amines, the acid is selected from a combination of one or more of organic carboxylic acids and inorganic acids, the aldehyde is a monoaldehyde, a dialdehyde or a polymer of aldehydes, and the reducing agent is selected from a combination of one or more of formic acid, sodium formate, oxalic acid, sodium oxalate and triphenylsilane. The proton-type ionic liquid in the present invention can play a role in self-catalytic reaction, so that while ensuring high yield and high purity of tertiary amine products, mild reaction conditions are achieved, high pressure and hydrogen reduction atmosphere are not required, and safe and green reducing agents can be used.

The invention provides a method for stepwise and efficiently purifying a key impurity sodium oxalate in a sodium aluminate solution by utilizing ultrasonic waves, and particularly relates to the technical field of aluminum oxide production. The method provided by the invention comprises the following steps: adding alkali containing Na into a sodium aluminate solution to adjust the concentration of Na2O in the sodium aluminate solution to be 180-260g / L, after the sodium aluminate solution is cooled, adding a seed crystal, controlling the concentration of the seed crystal to be 5-40g / L, and carrying out ultrasonic gradient purification; the step-by-step ultrasonic purification comprises the step of sequentially performing strong ultrasonic assisted crystallization and weak ultrasonic assisted crystallization; the power of the strong ultrasound is 0.1-0.6 W / L of the sodium aluminate solution; the power of the weak ultrasound is 0.01-0.05 W / L of the sodium aluminate solution; the time of the ultrasonic step purification is 10 minutes to 15 hours. The method provided by the invention has the advantages of low caustic alkali loss rate, high sodium oxalate purification rate, reduction of the purification cost, high purification efficiency, simple method and easy realization of industrialization, and the obtained filter residue can be recycled as a seed crystal.

The invention provides a high-crystallinity g-C3N4 nanosheet photocatalytic material as well as a preparation method and application thereof, and belongs to the technical field of nanometer photocatalytic materials. The preparation method comprises the following steps: dissolving a precursor dicyandiamide forming g-C3N4 in water under heating in a water bath, then adding sodium oxalate into the solution, carrying out vacuum freeze drying on the obtained mixed solution, and then calcining the obtained powder at a high temperature to obtain the high-crystallization g-C3N4 nanosheet. The g-C3N4 nanosheet not only has a high-crystallinity crystal lattice and an ultrathin nanosheet structure, but also shows excellent photocatalytic performance. Under visible light, the hydrogen production capacity of the high-crystallinity g-C3N4 nanosheet photocatalytic material is improved by 177.8% compared with that of bulk phase g-C3N4.

The invention belongs to the technical field of catalyst preparation, and particularly relates to an ozone catalyst for water treatment and a preparation method thereof, and the preparation method comprises the following steps: uniformly mixing iron-manganese modified zeolite subjected to hot water treatment, TEOS hydrolysate, VTMS hydrolysate, a VSNa solution, divinyl benzene, an initiator, sodium chloride and CMC to obtain slurry, treating the slurry into wet particles, and drying the wet particles to obtain the ozone catalyst for water treatment. Carrying out heating curing treatment on the wet particles to obtain a catalyst precursor, washing the catalyst precursor with deionized water, and then carrying out heat treatment and cooling to obtain the catalyst. The method can effectively reduce the effluent COD of the petrochemical wastewater containing sodium oxalate, and is high in long-term use stability.

The present invention provides a process method and application for decalcification in lithium liquid. The process method for decalcification in lithium liquid comprises the following steps: S1, adding sodium oxalate to the lithium liquid, and adding sodium hydroxide to adjust the pH value of the solution to 6-7, reacting at a stirring rate of 200-400 r / min at room temperature for 1-2 hours, and filtering to obtain solution one; S2, passing solution one through a macroporous resin column at a flow rate of 10-15 BV / h to obtain solution two; S3, filtering solution two with a modified ceramic membrane to obtain solution three; S4, precipitating lithium in solution three and purifying it to obtain a lithium phosphate product. The process method for decalcification in lithium liquid of the present invention can remove most of the calcium ions in the lithium liquid, and can also remove most of the magnesium ions, and can reduce the lithium loss rate, and improve the purity of the lithium phosphate product finally obtained.

The present invention discloses a method for the simultaneous detoxification of organotin waste and the preparation of sodium stannate. The method comprises mixing the organotin waste with a composite additive comprising sodium oxalate and hydrogen peroxide as active ingredients, followed by spray combustion. The combustion exhaust is subjected to dust removal to recover a tin-rich material, which is then water-leached to obtain a sodium stannate solution. By adding sodium oxalate and hydrogen peroxide during the combustion and decomposition of the organotin waste, the method not only enhances the thermal conversion process of the organotin compound, converting its toxic organic functional groups into harmless CO2 and H2O emissions, but also promotes dioxin decomposition, sulfur fixation, and suppresses NOx generation. Furthermore, the method efficiently converts tin into sodium stannate, which is easily recovered by water leaching. The method is simple to operate, highly efficient, and environmentally friendly.

The present invention discloses a Prussian blue-based sodium-ion battery positive electrode material, a preparation method, and applications thereof. The method comprises: mixing sodium ferrocyanide, oxalate, and a non-aqueous solvent, subjecting the mixture to a ball-milling reaction, and washing the product after the ball-milling reaction to remove unreacted raw materials and a portion of sodium oxalate generated by the reaction, thereby obtaining the Prussian blue-based sodium-ion battery positive electrode material. The present invention can synthesize Prussian blue-based compounds with low defects and low interstitial water molecule content, thereby improving the sodium storage performance and capacity utilization of such materials; it also reduces the probability of side reactions in the electrolyte causing cell bloating. In addition, the use of oxalate-based raw materials can also generate a sodium oxalate-based positive electrode sodium supplement during the synthesis of the Prussian blue-based compound, thereby replenishing sodium ion loss caused by SEI film formation or other side reactions during the initial charge.

The invention relates to a sodium-ion battery and application thereof.The sodium-ion battery comprises a positive plate, a diaphragm, a negative plate, electrolyte and a current interruption device, and the sodium-ion battery meets the following two conditions that (1) a positive active material layer of the positive plate contains gas production particles and auxiliaries, the gas production particles are selected from sodium carbonate and / or sodium oxalate, the auxiliary agent is selected from ferric chloride and / or aluminum chloride, and the mass fraction of the gas production particles in the positive electrode active material is greater than that of the auxiliary agent in the positive electrode active material layer; the sum of the mass fractions of the gas generation particles and the auxiliary agent in the positive electrode active material layer is within 4%; and (2) the trigger threshold value of the current interruption device is 0.55 MPa to 0.85 MPa. According to the sodium ion battery disclosed by the invention, the potential safety hazard of the traditional sodium ion battery under the working conditions of overcharge and thermal abuse can be solved by optimizing the synergistic effect of the internal gas production mechanism of the battery cell and the CID trigger threshold value.

The invention provides a method for synergistically removing organic matters in an aluminum oxide production process, and belongs to the field of aluminum oxide production. The method comprises the following steps: adding a macromolecular organic matter oxidant into a sodium aluminate solution, and carrying out a stirring reaction to degrade macromolecular organic matters in the sodium aluminate solution into medium and small molecular organic matters, so as to obtain a first mixed solution; carrying out solid-liquid separation on the first mixed solution to obtain a first filtrate; adding a sodium oxalate adsorbent into the first filtrate, and carrying out stirring reaction, so that sodium oxalate in the first filtrate is subjected to controlled crystallization on the surface of the sodium oxalate adsorbent to obtain a second mixed solution; carrying out solid-liquid separation on the second mixed solution to obtain a second filtrate; and returning the second filtrate to the aluminum oxide production process. Through a step-by-step targeted treatment design, the limitation of single type of removed organic matters in the existing organic matter removal technology is effectively overcome, and meanwhile, by virtue of an adsorbent mediated crystallization mechanism, the problem that the sodium oxalate crystal morphology is difficult to effectively control is solved.

A process for producing a nitrogen-doped peony-shaped molybdenum oxide, comprising the following steps: (1) adding a regulator to a molybdenum-containing solution for reacting, concentrating and thermally treating to obtain a peony-shaped molybdenum oxide; and (2) dissolving the peony-shaped molybdenum oxide in a conditioning agent and adding an amine source for standing, centrifuging, washing, and heat-treating, thereby obtaining the nitrogen-doped peony-shaped molybdenum oxide; wherein the regulator is at least one of the following: nitric acid, ammonium nitrate, sodium persulfate, ammonium persulfate, concentrated sulfuric acid, H2O2, ozone, sodium hypochlorite, wherein in step (2), the conditioning agent is at least one of the following: sodium acetate, ammonium acetate, sodium formate, diaminoethane, sodium oxalate, ammonium benzoate, sodium phenylacetate, sodium propionate, sodium tartrate, sodium citrate, ammonium citrate; and wherein in step (2) the amine source is at least one of the following: aniline, dimethylamine, trimethylamine, benzylamine, phenethylamine, ethylamine, diethylamine, propylamine, phenylenediamine, xylylenediamine, amphetamine.

An integrated energy system comprising a power plant configured to generate steam. The power plant may comprise a nuclear reactor and / or an electricity generation system. A chemical product generation system may comprise a first reaction chamber that receives sodium formate (HCOONa), which decomposes into sodium oxalate ((COO)2Na2) and hydrogen (H2), via the insertion of a first portion of steam at a first temperature, wherein the steam may comprise a first reaction chamber containing superheated steam. A chemical product generation system may comprise a second reaction chamber that receives sodium oxalate ((COO)2Na2), which decomposes into sodium oxide (Na2O), carbon monoxide (CO), and carbon dioxide (CO2), via the insertion of a second portion of steam at a second temperature. A syngas generation system may be operably connected to the chemical product generation system and configured to generate a combination of hydrogen (H2), carbon monoxide (CO), and / or carbon dioxide (CO2), and / or syngas.

The application discloses a kind of corrosion methods for revealing alloy sample metallographic structure, comprising: step S1, preparation electrolytic etchant: using oxalic acid, sodium bicarbonate and concentrated nitric acid preparation final concentration is 0.25-0.5mol / L sodium oxalate and 0.15-0.3mol / L nitric acid mixed aqueous solution;Step S2, electrolytic etching of corrosion piece: electrolytic etchant is poured into electrolytic etching instrument, and the alloy sample to be corroded is placed in electrolytic etching liquid and electrolytic etching is carried out.The electrolytic etchant of the application uses oxalic acid, sodium bicarbonate and concentrated nitric acid as reactant, and is prepared by chemical ion reaction.After the preparation of etchant is finished, a small amount of carbonate ions and hydrogen ions are still stored in the etchant, so that a small amount of carbonate ions and hydrogen ions will continue to react when the alloy sample is electrolyzed, and micro-bubbles are attached to the alloy sample, so that the metallographic photo taken has stereoscopic imaging effect, and the grain boundary is clear and identifiable.

A method for efficiently recovering cobalt and nickel from waste lithium battery extract belongs to the field of hydrometallurgical technology. The technical problem solved by this invention is to provide a low-cost, low-pollution, and high-efficiency method for recovering cobalt and nickel from waste lithium battery extract. Specifically, it discloses a method using sodium oxalate solution to back-extract from a nickel-cobalt containing extract, obtaining a back-extract, then precipitating by adjusting the pH, and finally obtaining cobalt oxalate and nickel oxalate products after drying. The method includes the following steps: (1) preparing a sodium oxalate solution; (2) back-extraction; (3) cobalt precipitation; (4) nickel precipitation; (5) washing and drying the precipitate. This method is not only simple to operate, highly efficient, low-cost, and environmentally friendly, but also regenerates the extract, making it suitable for industrial production.

The present application provides a kind of high-efficiency polymerization inhibitor for styrene rectification, by weight parts, including following each component: 20-40 parts of radical scavenger, 15-25 parts of modified alkylamine and 50-100 parts of composite alcohol solution, 2-4 parts of sodium citrate and 1-3 parts of sodium oxalate;The radical scavenger is porous calcium carbonate microspheres loaded with nitroxyl radical and plant extract;The modified alkylamine is layered double hydroxide LDH loaded with alkylamine;The composite alcohol solution is ethylene glycol, glycerol and polyvinyl alcohol;It is applied to styrene rectification, and the polymerization inhibition capacity is obviously improved by efficient capture of free radical.

The invention discloses a degreasing agent for a base plate of a cold-rolled hot-dip aluminum-zinc steel plate and a degreasing method, and mainly solves the technical problems that an existing degreasing agent for the base plate of the cold-rolled hot-dip aluminum-zinc steel plate is low in degreasing efficiency, and oxides on the surface of the steel plate cannot be completely removed. According to the technical scheme, the degreasing agent for the base plate of the cold-rolled hot-dipped aluminum-zinc steel plate comprises the following components in percentage by weight: 10%-25% of sodium hydroxide, 5%-15% of potassium hydroxide, 3%-6% of a surfactant OP-10, 4%-8% of sodium dodecyl benzene sulfonate, 1%-2% of fatty alcohol polyoxyethylene ether sodium sulfate, 2%-10% of sodium oxalate and the balance of water. 2%-5% of sodium gluconate, 1%-5% of potassium chloride, 2%-4% of organic silicon defoaming agent and the balance of deionized water. The degreasing agent is suitable for removing residual oil and iron oxide on the surface of a base plate of a cold-rolled hot-dipped aluminum-zinc steel plate, the degreasing capacity and the iron removal capacity are high, and the using effect is good.

The invention discloses a method for extracting scandium from a byproduct FeSO4 # imgabs0 # H2O in a sulfuric acid process titanium dioxide waste acid concentration process, and belongs to the field of valuable resource recovery. The method comprises the following steps: mixing and dissolving FeSO4 # imgabs1 # H2O and water, filtering to obtain a ferrous sulfate solution, freezing, crystallizing and filtering to obtain a scandium-containing solution, and circulating for multiple times to increase the scandium concentration; then ferric iron in the solution is reduced, the pH is adjusted with barium hydroxide, scandium is precipitated, and a mixed solid of barium sulfate and scandium hydroxide is separated out; the method comprises the following steps: dissolving scandium hydroxide with acid, filtering and washing, precipitating scandium with oxalic acid or sodium oxalate, and finally roasting scandium oxalate at high temperature to prepare scandium oxide with Sc2O3 greater than or equal to 99.99% and Sc2O3 / REO greater than or equal to 99.9999%. The method has the advantages of being convenient to operate, simple in technological process, low in production cost and good in environmental protection benefit, industrialization is easy, the scandium element in the sulfuric acid process titanium dioxide waste acid concentration byproduct can be efficiently recycled, and efficient utilization of resources is achieved.

The present application relates to the technical field of lithium carbonate preparation, in particular to a method for preparing battery-grade lithium carbonate by using salt lake lithium carbonate, comprising the following steps: adding purified water and ethanolamine to crude lithium carbonate from salt lake brine, wet ball milling, then adding sodium hydroxide solution for alkali washing, adopting purified water to make slurry of the obtained filter residue A, carbonizing to obtain filter liquor B, adding magnesium chloride and sodium oxalate in sequence for impurity removal, pyrolyzing and crystallizing, drying the obtained lithium carbonate wet product to obtain battery-grade lithium carbonate. The method has the advantages of high purification process treatment efficiency and high lithium recovery rate, and the prepared lithium carbonate product can meet the requirements of battery-grade lithium carbonate.

The application provides a method for preparing lead oxide from copper smelting electric dust ash, and comprises the following process steps: (1) sulfuric acid leaching: adding sulfuric acid; (2) acetic acid leaching: adding acetic acid; (3) ammonia water-sodium acetate leaching: adding ammonia water and sodium acetate; (4) lead precipitation: adding sodium oxalate; (5) lead oxide. The application adopts twice acid leaching, on the one hand, valuable metals in the copper smelting electric dust ash except lead are effectively leached; on the other hand, impurity elements in the acid leaching residue are reduced, and high-purity lead oxide products are prepared subsequently. The lead element in the acid leaching residue is leached by ammonia water-sodium acetate, and under the weak alkaline condition, the leaching of lead is beneficial, and the leaching of other elements such as copper, arsenic and zinc is inhibited.

The invention relates to the technical field of battery materials, in particular to a sodium ion battery positive electrode material and a preparation method and application thereof. The sodium ion battery positive electrode material is prepared by the method. The method comprises the following steps: carrying out ultrasonic treatment on a reaction system, and then carrying out heating and stirring treatment to obtain a precipitate mixed solution; carrying out centrifugal treatment on the precipitate mixed solution to obtain a coarse precipitate; washing and centrifuging the coarse precipitate to obtain a precipitate; performing freeze drying treatment on the precipitate to obtain precursor powder; and uniformly mixing the precursor powder, the nano TiO2 powder, anhydrous sodium carbonate and sodium oxalate, and sequentially carrying out ball milling treatment, screening treatment, tabletting treatment and calcination treatment to obtain the sodium ion battery positive electrode material. The application is the application of the sodium ion battery positive electrode material in a sodium ion secondary battery. According to the invention, the problems of irreversible structure phase change and high sodium ion diffusion barrier in charge-discharge cycles due to the adoption of O3-phase layered transition metal oxide in the existing commercial sodium ion positive electrode material are solved.

The invention provides an alkaline chemical polishing solution suitable for a high-Si-content aluminum alloy inner runner and a polishing method, and belongs to the technical field of metal material surface treatment. According to the method, an alkaline polishing solution composed of sodium hydroxide, sodium nitrate, thiourea, sodium silicate, sodium phosphate, sodium fluoride, ceric sulfate and an additive is adopted for conducting long-time chemical polishing on the high-silicon aluminum alloy at the room temperature, and dilute acid neutralization, acetic acid activation and sodium oxalate and sodium dodecyl benzene sulfonate composite cleaning solution are matched for ultrasonic dust removal. According to the technology, nitric oxide pollution generated by acid polishing is avoided, the corrosion rate is reduced, effective polishing of a complex inner runner is achieved, the surface roughness is remarkably reduced, material loss is small, hanging dust is completely removed, and the technology has environment friendliness and high-precision machining capacity.

The invention belongs to the field of pet food processing, and relates to a premix for improving the health of urinary tracts of pets. The premix comprises the following components in parts by weight: 25-35 parts of Chinese yams, 25-35 parts of poria cocos, 15-25 parts of dandelions, 15-25 parts of centella asiatica, 15-25 parts of semen plantaginis, 5-15 parts of rhizoma polygonati, 5-15 parts of dogwood and 5-15 parts of Chinese wolfberry fruits. By adding the premix disclosed by the invention into daily ration, the concentrations of cat blood creatinine, urea nitrogen and blood oxalic acid are reduced, the absorption and excretion of oxalic acid are influenced, and the formation of calcium oxalate calculi is prevented. The premix disclosed by the invention can relieve the kidney toxicity of sodium oxalate to cats, improve the physiological indexes of the kidneys, reduce the formation of calcium oxalate calculi and provide basic guarantee for the treatment of chronic urinary system diseases. The premix disclosed by the invention can be used for improving the urinary tract health of cats.

The invention discloses a method for recovering heavy metal ions from strongly acidic nuclear waste water, comprising the following steps: A. adjusting the acidity of the strongly acidic nuclear waste water and heating it, then adding oxalic acid and / or sodium oxalate to carry out a precipitation reaction; B. adding acrylic polymer monomers and thermal initiators to carry out polymerization reaction, and then filtering; C. adding sodium sulfate to carry out double salt precipitation, and then adding a photoinitiator to perform photopolymerization to obtain a liquid to be extracted; D. adding a diamide pod ether extractant to the liquid to be extracted to carry out an extraction reaction, and liquid-liquid separation after the reaction is completed. The invention first solidifies heavy metal ions such as thorium, nickel, and cobalt through high-temperature precipitation of oxalic acid / sodium oxalate to reduce the metal ion concentration in the solution system, and then extracts and separates heavy metals, lanthanide elements, and precious metals, thereby significantly improving the removal rate and extraction effect of heavy metals and overcoming the shortcomings of the prior art.

This application provides a method for deep removal of calcium impurities from scandium oxide, belonging to the field of rare earth metal oxide purification. The method includes: dissolving scandium oxide raw material containing calcium impurities to obtain a calcium-containing scandium solution; adding a pH adjuster to the calcium-containing scandium solution to obtain a first scandium solution; reacting the first scandium solution with phosphoric acid and / or phosphate to obtain a second scandium solution and solid calcium phosphate; reacting the second scandium solution with a complexing agent to obtain a third scandium solution; reacting the third scandium solution with oxalic acid and / or sodium oxalate to obtain scandium oxalate crystals and a calcium complex solution; adding a strong acid solution to the calcium complex solution; and calcining the scandium oxalate crystals to obtain scandium oxide. Through calcium phosphate precipitation-complexation-crystallization, not only can calcium impurities be deeply removed from scandium oxide products, but impurities such as iron, titanium, and zirconium can also be removed, resulting in scandium oxide products with a purity of over 99.99%.