85results about "Boron-oxygen compounds" patented technology

The invention discloses a gadolinium boron molybdate magnetic refrigeration material with triangular magnetic resistance and a preparation method and application of the gadolinium boron molybdate magnetic refrigeration material. The chemical formula of the material is Gd2B2MoO9, the material belongs to a triclinic system, and the space group is P-1; the crystal structure has the characteristic that nearest rare earth Gd ions have magnetic resistance file; the material is prepared by a solid phase method or a sol-gel method; the magnetic phase change temperature of the material is 0.7-0.9 K, the material shows a remarkable magnetothermal effect at low temperature, the maximum isothermal magnetic entropy change values of the material are 30.0-35.0 J / kg.K and 51.0-55.0 J / kg.K respectively under the magnetic field change of 0-2T and 0-5T, and the material can be applied to low-temperature magnetic refrigeration. The gadolinium boron molybdate Gd2B2MoO9 material with triangular magnetoresistance provided by the invention has the advantages of low raw material price, simple process and lower equipment requirement, and is suitable for industrial production.

The present application provides a method for extracting lithium from salt lakes. The method comprises the following steps: (1) subjecting concentrated brine to ammonia vapor magnesium precipitation treatment to obtain a magnesium-removed filtrate and filter residue; (2) mixing the filter residue with hydrobromic acid, adjusting the pH to precipitate boric acid, and performing solid-liquid separation to obtain a filtrate and boric acid; (3) evaporating and concentrating the filtrate obtained in step (2), performing aeration treatment after drying treatment, and performing water immersion separation treatment to obtain a lithium-rich solution and magnesium oxide; (4) mixing the lithium-rich solution and lithium carbonate to perform a solid-phase transformation reaction, and filtering to obtain a purified lithium salt solution and calcium carbonate. The method of the present application can separate boron, magnesium, and calcium-lithium in one step, and further calcium removal can separate calcium and lithium, which is beneficial to obtaining high-purity lithium carbonate and reducing lithium loss caused by the adsorption of lithium by magnesium hydroxide colloid.

The present invention provides an oxyhalide, a preparation method therefor, and an all-solid-state lithium battery. The preparation method comprises: (1) grinding a mixture of a lithium source and a boron source, which are weighed in a stoichiometric ratio, tableting the mixture, then putting the tableted mixture into a reaction tube, evacuating the reaction tube to establish a vacuum, sealing the reaction tube, and then performing primary calcination, wherein the primary calcination temperature is 300-450ºC, and the primary calcination time is 4-20 h; and (2) after the primary calcination, cooling to room temperature, taking out the intermediate product from the reaction tube, grinding and tableting the intermediate product, then putting the tableted product into a reaction tube, evacuating the reaction tube to establish a vacuum, sealing the reaction tube, performing secondary calcination, and then cooling to room temperature. The preparation method of the present invention is simple and has high raw material utilization rate and no byproducts, thereby facilitating industrial production. The prepared oxyhalide has relatively high ionic conductivity and stability, and relatively good interface stability with metal lithium. The prepared all-solid-state lithium battery has excellent electrochemical performance.

A method of producing a chemical hydride is described and which includes selecting a composition having chemical bonds and which is capable of forming a chemical hydride; providing a source of a hydrocarbon; and reacting the composition with the source of the hydrocarbon to generate a chemical hydride.

The invention relates to the technical field of heat-insulating and demagnetizing refrigeration, and discloses a heat-insulating and demagnetizing refrigeration material based on a Trellis crystal lattice and a preparation method and application of the heat-insulating and demagnetizing refrigeration material. The chemical formula of the heat insulation and demagnetization refrigeration material based on the Trellis crystal lattice is Gd2GeB2O8. A magnetic test result of the Gd2GeB2O8 crystal shows that the magnetic anisotropy of the crystal material is relatively weak and tends to magnetic isotropy, and a long-range magnetic orderliness phenomenon is not observed above 1.8 K. And when adiabatic demagnetization is carried out under initial conditions that T is equal to 3K and B is equal to 7T, the material can reach the maximum negative magnetic entropy difference of 51.68 J * kg <-1 > * K <-1 >, which shows that the Gd2GeB2O8 has a better application prospect in a 3-17K temperature zone and a sub-Kelvin temperature zone.

The present invention provides a method for recovering iodine and boric acid from iodine-containing waste liquid. The method includes: subjecting the iodine-containing waste liquid to primary acidification after pretreatment, followed by solid-liquid separation to obtain boric acid and iodine-containing solution; sequentially performing secondary acidification and oxidation on the iodine-containing solution to obtain a solid-liquid mixture containing iodine and boric acid; adjusting the pH value of the solid-liquid mixture with alkali and then performing solid-liquid separation to obtain iodine and a salt-containing solution; subjecting the iodine vapor generated during the reaction to condensation and spray absorption in sequence, and returning the condensed iodine for co-recovery. The method of the present invention first precipitates boric acid through acidification treatment according to the composition of the iodine-containing waste liquid, recovers the boric acid product, and then obtains a high-purity iodine product through further acidification and oxidation reactions; the present invention condenses and spray-absorbs the iodine vapor to avoid iodine loss and possible environmental pollution, and ensures the iodine recovery rate; the method is simple to operate, has mild conditions, low cost, and realizes the resource utilization of the waste liquid.

The invention relates to the technical field of batteries, in particular to a positive electrode material and a preparation method and application thereof. The positive electrode material comprises: an inner core, the inner core satisfies a chemical general formula LizMnxFe (1-x) RyPO4, and 0.5 < = xlt; 1, 0lt; yt; Yt; 0.1, 0.9 < = z < = 1.2; r comprises at least one of Al, Mg, Ca, Sr, V, Cr, Y, Mo, Nb, B, W, La, Sm, Co, Ni, Cu, Zn, Zr and Ti; the coating layer is arranged on at least part of the surface of the inner core, and the coating layer comprises a boron-doped carbon coating layer. The lithium manganese iron phosphate positive electrode material is synergistically modified in a multi-element doping and boron doping carbon coating manner, so that the lithium ion transmission path can be widened, more electron holes can be formed, the electron transmission efficiency can be improved, the conductivity of the material can be improved, and the rate and the dynamic performance of the material can be further improved; and relatively high and stable cycle performance is ensured.

The application discloses a surface-coated and bulk-gradient co-doped sodium ion battery positive electrode material and a preparation method and a sodium ion battery thereof, and belongs to the technical field of sodium ion batteries. The sodium ion battery positive electrode material comprises a layered transition metal oxide and a coating layer coated on the surface of the layered transition metal oxide; the layered transition metal oxide is a nickel-iron-manganese-based layered transition metal oxide, and the coating layer is an amorphous boron oxide coating layer; the chemical formula of the surface-coated and bulk-gradient co-doped sodium ion battery positive electrode material is Na(Ni 1 / 3 Fe 1 / 3 Mn 1 / 3 ) x B y M z O2, 0.9≤x≤0.98, 0.01≤y<0.2, 0.01≤z<0.1, and x+y+z=1, and M is selected from W or Nb; wherein the doping concentration of boron elements and metal M elements presents a gradient decreasing trend from the surface layer to the inside along the radial direction; the surface boron oxide coating and the bulk-gradient doping of boron elements and metal M elements are simultaneously realized; the surface coating layer effectively reduces the interface side reaction, and the bulk-gradient doping stabilizes the crystal structure from the inside; and the two synergistically act to jointly inhibit the structural degradation in the cycle process.

The utility model relates to the technical field of boric acid production, and discloses a boric acid production impurity separation device which comprises a bottom plate, a first gear fixedly connected to the outer surface of a driving rod, a rotating rod fixedly connected to the interior of a second gear, and stirring rods fixedly connected to the outer surface of the rotating rod and the outer surface of the driving rod. A discharging brush is fixedly connected to the outer surface of the driving rod, and an annular discharging plate is arranged at the bottom of the treatment tank. According to the stirring device, the driving motor is started, the first gear on the driving rod drives the rotating rod to rotate through the second gear, the stirring rods stir dissolved substances in the tank in a staggered mode, and after the dissolved substances are dissolved and precipitated, the annular discharging plate is opened to carry out the subsequent impurity removal procedure. And the residual solution passes through an adsorption column filled with a special adsorbent, so that impurities in the boric acid solution can be further adsorbed and removed, and the adsorption effect is better.

A method for producing a positive electrode active material for a lithium ion secondary battery, the method comprising a mixing step of mixing a nickel-containing substance containing at least nickel and a lithium compound to prepare a first raw material mixture, a sintering step of sintering the first raw material mixture in an oxidizing atmosphere to obtain a sintered material, and a water washing step of washing the sintered material with water, the method includes a sintering step in which a first starting material mixture is prepared, a washing step in which the sintered material obtained in the sintering step is washed to obtain a dehydrated cake, a boron addition step in which the dehydrated cake obtained in the washing step and a boron-containing substance are mixed to prepare a second starting material mixture, the boron-containing substance being at least one substance selected from a boron monomer and a boron-containing compound, and a heat treatment step in which the second starting material mixture is heat-treated.

The invention relates to the technical field of chemical devices, in particular to a hydrolytic crystallization device, a hydrolytic crystallization method and a system for manufacturing boric acid. The hydrolytic crystallization device comprises a container body, a cyclic heating assembly, a flow guide part, a stirring assembly, a crystal collecting assembly and a steam collecting part. The container body is arranged to form a hydrolytic crystallization chamber and a feeding hole; the circulating heating assembly heats the materials and then returns the materials to the crystallization chamber, and the process is circulated; the flow guide part is arranged in the hydrolytic crystallization chamber and used for forming a flow guide chamber, and the top and the bottom of the flow guide chamber are both communicated with the hydrolytic crystallization chamber; the stirring assembly is arranged to stir materials in the flow guide chamber; part of materials at the bottom of the crystallization chamber can flow downwards to enter the crystal collection assembly; the steam collecting piece is used for condensing steam at the top of the hydrolysis crystallization chamber into liquid and collecting the liquid. According to the hydrolytic crystallization device, the crystallization efficiency and the grain uniformity can be improved.

The present application relates to a kind of sodium sulfate iron composite sodium ion positive electrode material and its preparation method and battery, belong to sodium battery technical field, to solve at least one of the problems such as the poor air stability and conductivity of the sodium sulfate iron positive electrode material prepared by the existing method, easily lead to the capacity and cycle stability of battery is low, limit the application of sodium sulfate iron positive electrode material in sodium ion battery.The inner layer of the sodium ion positive electrode material of the present application is boron oxide coated sodium sulfate iron, the middle layer is boron-carbon nanotube transition layer, the outer layer is carbon nanotube coated sodium sodium pyrophosphate phosphate, boron-carbon nanotube transition layer is formed by the covalent bonding reaction of boron oxide and the functional group of CNTs after high-temperature induced decomposition of boric acid, double optimization is carried out in the interface combination and conductivity, improve the ion conductivity of sodium ion positive electrode material, the capacity of positive electrode material, rate and cycle performance, especially air stability.

A method for producing a positive electrode active material for a lithium ion secondary battery, the method comprising a mixing step in which a nickel-containing material containing at least nickel and a lithium compound are mixed to prepare a first starting material mixture, a sintering step in which the first starting material mixture is sintered in an oxidizing atmosphere to obtain a sintered material, and a step in which the sintered material obtained in the sintering step is washed with water to obtain a positive electrode active material for a lithium ion secondary battery. A boron addition step for preparing a second starting material mixture by mixing the water-washed powder obtained in the water-washing step with a boron-containing substance, which is at least one substance selected from a boron monomer and a boron compound; a heat treatment step for heat-treating the second starting material mixture; and a cooling step in which at least an atmosphere in a temperature region equal to or lower than the boundary temperature is used as a carbon dioxide removal atmosphere and cooling is performed.

The application belongs to the technical field of fine chemical industry, and specifically provides a process method for preparing nuclear-grade boric acid by reverse osmosis membrane purification of boric acid, which comprises the following process steps: pretreatment, complexation impurity removal, two-stage membrane separation, and rate control crystallization. The process method has the advantages of excellent impurity removal effect, simple process, easy operation and control, good reproducibility, low production cost, environmental friendliness, etc., and the prepared nuclear-grade boric acid is suitable for the field of nuclear industry, electronic-grade materials and other fields with high requirements for the purity of boric acid.

The invention relates to a device and method for preparing boric acid from a boron trifluoride-methyl ether complex, the device comprises a steam generator, a gasification device and a reactor, and the steam generator and the gasification device are gathered through a pipeline and then connected with the reactor; the steam generator is used for producing steam; and the gasification device is used for producing a gas boron trifluoride-methyl ether complex. The method for preparing boric acid comprises the following steps: step 1, air replacement; step 2, preheating; 3, enabling water vapor to react with the boron trifluoride-methyl ether complex in a reactor to obtain a primary product; and step 4, after the reaction is completed, continuously keeping the temperature. The boron trifluoride-methyl ether complex reacts with water vapor at high temperature, boron oxide is obtained through a one-step method, the technical route is greatly simplified, the yield of boron is increased, and production energy consumption is reduced.

The invention belongs to the technical field of fine chemical engineering, and particularly provides a process method for preparing nuclear-grade boric acid by purifying boric acid through a reverse osmosis membrane, and the process method comprises the following process steps: pretreatment, complexing impurity removal, two-stage membrane separation and speed-controlled crystallization. The technological method provided by the invention has the advantages of being excellent in impurity removal effect, simple in process, easy to operate and control, good in reproducibility, low in production cost, environment-friendly and the like, and the prepared nuclear-grade boric acid is suitable for the fields of nuclear industry, electronic-grade materials and the like which have high requirements on the purity of boric acid.

The present application relates to the field of biological enzyme catalyst, especially to a kind of immobilized laccase based on inorganic porous material and its preparation method and application, the immobilized laccase based on inorganic porous material designed in the present application, the immobilized laccase includes inorganic porous material and laccase adsorbed and fixed on the surface of inorganic porous material, the inorganic porous material is prepared by dynamic hydrothermal synthesis method with piperidine as template agent, with aluminum isopropylate as aluminum source, boric acid as boron source, fumed silica as silicon source. Laccase is adsorbed and immobilized by using the inorganic porous material, and the immobilized laccase catalyst obtained has good enzymatic performance, and the immobilized laccase has significant effect in removing quinolone antibiotics.

The embodiment of the invention relates to the technical field of chemical devices, in particular to an esterification device and a system for manufacturing boric acid. The esterification device comprises an esterification container, a heating piece and a stirring assembly, the esterification container forms an esterification chamber and a liquid inlet, a feed port and a discharge port which are communicated with the esterification container, the liquid inlet is used for introducing a boron trifluoride-methanol complex into the esterification chamber, the feed port is used for introducing a solid defluorination agent into the esterification chamber, and the discharge port is used for discharging the boron trifluoride-methanol complex into the esterification chamber; the boron trifluoride-methanol complex and the solid defluorinating agent are subjected to an esterification reaction in the esterification chamber to generate trimethyl borate and a solid by-product; the heating piece is arranged to heat the esterification chamber and keep the temperature in the esterification chamber stable; the stirring assembly is used for stirring the materials in the esterification chamber, so that the materials are uniformly mixed. According to the esterification device, the temperature in the esterification chamber is kept constant through the heating piece, the reaction process is accelerated through the stirring assembly, and the esterification reaction rate and the material conversion rate can be increased.

The present invention provides a flaky boric acid and a preparation method thereof. The morphology of the flaky boric acid is flaky, D 50 The particle size is not less than 3 mm. The boric acid flakes provided by the present invention have D 50 The characteristic of larger particle size.

The present application relates to a series of compounds calcium halogenated borate and calcium halogenated borate nonlinear optical crystal and preparation method and use, the molecular general formula of the series of compounds is Ca2B3O6X, wherein X=Cl, Br, molecular weight 244.04-288.50, the compound is synthesized using solid phase reaction method;The crystal is orthorhombic, space group Cmc 21, the cell parameter is a=15.360 (6)-15.406 (2) Å, b=22.115 (3)-22.175 (10) Å, c=7.3617 (11)-7.454 (4) Å, Z=16, V=2508.2 (6)-2538.7 (19) Å 3 , the crystal is grown using cosolvent method, the powder frequency doubling effect is about 1.5-2 times of KDP (KH2PO4), has wide light transmission waveband, the crystal preparation method is simple, and the cost is low, the prepared crystal is large in mechanical hardness, easy to cut, polishing processing and preservation, the series of calcium halogenated borate nonlinear optical crystal described in the application has the advantages of stable physical and chemical properties, moderate mechanical hardness, not easy to break, easy to cut, polishing processing and preservation and the like.

The invention belongs to the technical field of salt lake boron extraction, and particularly relates to a system and method for efficiently extracting boron from salt lake brine, the system comprises a brine pretreatment module, an acidification reaction module, a solid-liquid separation module, a washing and drying module, a waste gas treatment module and a monitoring control module, the waste gas treatment module comprises a waste gas purification tower; waste gas generated by all the modules in the brine processing process is guided into the recycling area at the bottom of the tower body through the gas inlet pipe, the spraying assembly is started, purified water mist is released downwards, in gaps of the purification filler, the waste gas flowing upwards makes contact with the purified water mist flowing downwards, acid pollutants in the waste gas make contact with purification liquid, and the waste gas is purified. Dust particle impurities in the waste gas are combined with the purified liquid water mist and then settled downwards, and the dust particle impurities are separated from the waste gas after being absorbed; the purification filler effectively delays the flowing speed of the waste gas, the waste gas is in full contact with the purification water mist, and the purification efficiency of waste gas pollutants is improved.

This invention relates to the field of lithium-ion battery technology, specifically to a low-temperature cathode material and its preparation method, a cathode sheet, and a lithium-ion battery. The low-temperature cathode material includes a matrix material and a coating layer; the raw materials for preparing the low-temperature cathode material include a first precursor and a second precursor, with a mass ratio of n; n is related to the average single-crystal particle size r of the low-temperature cathode material, the electrode compaction density PD of the cathode sheet containing the low-temperature cathode material, and the particle size d of the low-temperature cathode material. 99 and particle size d min Satisfying 30≤(n×PD×d) 99 ) / (d min ×r)≤100. This low-temperature cathode material has low cost and good low-temperature charge-discharge performance.

The present application relates to the technical field of inorganic chemistry, and particularly relates to a method for comprehensive utilization of sodium borolite mineral resources, which comprises the following steps: taking sodium borolite as raw material, and obtaining boric acid, calcium sulfate hemihydrate and sodium nitrate through a series of coupled processing procedures in a production system, wherein the boric acid meets the quality index of superior product of the national standard boric acid product standard, the purity of the calcium sulfate hemihydrate reaches more than 99%, and the sodium nitrate meets the national standard sodium nitrate product standard. The method has the beneficial effect that the method for comprehensive utilization of sodium borolite mineral resources makes the elements such as boron, calcium, sodium and magnesium in the sodium borolite and the raw materials such as sulfuric acid, sulfate and nitric acid used in the processing enter the products as much as possible, not only makes the sodium borolite mineral resources be fully utilized, but also greatly reduces the discharge of "three wastes" in the production process.

The present invention relates to a rubidium fluoro-scandium borate compound, a rubidium fluoro-scandium borate nonlinear optical crystal, and a preparation method and application thereof. The rubidium fluoro-scandium borate compound has a chemical formula Rb2ScB3O6F2, does not contain a symmetry center and has a molecular weight of 382.33 g / mol. The rubidium fluoro-scandium borate nonlinear optical crystal belongs to the monoclinic crystal system, and belongs to the non-centrosymmetric space group P21, and the unit cell parameters are: a = 4.0372(10) Å, b = 11.800(3) Å, c = 8.823(2) Å, α = γ = 90°, β = 98.327(11) °, Z = 2. The present invention adopts a high-temperature vacuum packaging method or a solid-state synthesis method to prepare rubidium fluoro-scandium borate compounds. The present invention adopts a fluxing agent method to prepare a rubidium fluoro-scandium borate nonlinear optical crystal, which have the advantages of short absorption cutoff edge, large nonlinear optical effect, good thermal stability, and stable physical and chemical properties. The rubidium fluoro-scandium borate nonlinear optical crystal of the present invention can be used to fabricate nonlinear optical devices, which have important applications in fields such as optics, military, laser lithography, and communication, etc..

This invention discloses a method for preparing nuclear-grade boric acid, belonging to the fields of fine chemicals and nuclear materials technology. First, polyacrylonitrile-based activated carbon fibers are surface-modified by nitric acid oxidation and grafting with disodium ethylenediaminetetraacetate to impart strong ion exchange capabilities. Then, this modified fiber is packed into a fixed-bed adsorption column. Next, industrial boric acid is dissolved, pre-filtered, and the solution is passed through the adsorption column for dynamic adsorption purification, effectively removing Fe. 3+ Ca 2+ Cl ‑ SO4 2‑ Impurity ions are removed; finally, the product is obtained through programmed cooling crystallization, separation, and drying. This invention, through the synergistic effect of adsorption and ion exchange, achieves a boric acid main content ≥99.9% and reduces the impurity ion content to the ppm level while maintaining... 10 The boron isotope abundance is essentially unaffected, meeting the stringent requirements of Generation II and above nuclear power plants for boric acid used in safety and control systems. The process is stable and suitable for industrial production.

The invention discloses a device for recovering boric acid from an iron alloy XRF tabletting sample and a recovery method thereof, and relates to the technical field of analytical chemistry sample pretreatment and resource recovery. The recovery device comprises a base, a sample pretreatment mechanism, a leaching mechanism, a solid-liquid separation mechanism, an evaporation concentration mechanism, a complex reaction mechanism and a directional condensation trapping mechanism, wherein a master controller is fixedly mounted on the side wall of the base; the recovery method comprises the steps of sample pretreatment, leaching reaction, solid-liquid separation, evaporation and concentration, complexation reaction, vaporization and gradient condensation, boric acid trapping and desorption and purification. According to the method, volatilization, decomposition and impurity adsorption loss of boric acid in the operation process are reduced to the maximum extent, the boric acid recovery rate is effectively improved and is remarkably higher than that of a traditional method, meanwhile, the selective recovery capacity of boric acid is enhanced through introduction of the complexing agent and design of the special trapping trap, and interference of other coexisting components is reduced.

The positive electrode active material of the present invention can simultaneously improve the capacity and lifespan of a battery, the battery can simultaneously have improved capacity and lifespan, and the preparation method of the positive electrode active material can prepare the positive electrode active material capable of simultaneously improving the capacity and lifespan of the battery.

There is provided an aqueous boron solution and a method of making same. The aqueous boron solution contains at least 8 wt. % boron, an alkanolamine and an alkaline sodium salt. The aqueous boron solution has a boron to alkanolamine molar ratio of more than 3.0. Moreover, the aqueous boron solution obtained is clear and stable. The boron present in the solution is solubilized in the form of B(OH)3 or anions thereof and does not precipitate even in long term storage of the aqueous boron solution.

The invention relates to a method for recovering boron from boron-containing calcium salt waste residue, which comprises the following steps of: a, preparing slurry, namely adding a sintering aid into the boron-containing calcium salt waste residue, calcining and crushing at high temperature, and adding water to prepare the slurry; b, boric acid leaching is conducted, specifically, a leaching agent is added into the slurry, stirring is conducted, and a boron-containing solution is obtained; c, precipitating and filtering, namely filtering the leached slurry, heating and concentrating filtrate, and applying filter residues to industrial calcium fluoride production; step d, preparing boric acid, evaporating and concentrating the filtered filtrate, and adjusting the pH value to 1-5; and step e, crystallizing boric acid, cooling the filtrate to room temperature, separating out a crystal substance, filtering, washing and drying to obtain a boric acid product. According to the method, the cost of the enriched boron-10 acid is reduced, the benefits of enterprises are increased, the whole industrial chain development of the domestic enriched boron-10 acid is promoted, and solid waste resource utilization is realized while the solid waste treatment cost is reduced.

The invention provides a method and a device for separating boron isotopes through membrane chromatography. The invention provides a method for separating boron isotopes by membrane chromatography, which comprises the following steps: by taking a composite membrane material as a stationary phase and a boron-containing solution as a mobile phase, directly enabling the boron-containing solution to flow through a composite membrane to enrich 10B in a membrane phase and enrich 11B in a liquid phase, wherein the composite membrane contains a compound capable of separating boron isotope functional groups. The invention provides a membrane chromatography technology which has the advantages of a membrane technology and a chromatography technology, on one hand, through structural modification and functionalization of membrane ligand pore channels and surfaces, selective adsorption separation of the membrane on different target objects can be achieved, separation factors are increased, and the abundant membrane pore channel structure can effectively reduce internal diffusion resistance and improve separation efficiency; on the other hand, by constructing a multi-stage membrane chromatographic separation system, chromatographic column separation factors can be effectively increased, the separation time can be shortened, and the cost can be reduced.