15results about "Boron" patented technology

The application discloses a method and integrated system for enriching lithium and removing boron from salt lake brine, and belongs to the technical field of lithium resource purification. The method comprises the following steps: S1. primary electrodialysis of the salt lake brine to obtain a primary low-boron lithium concentrate and a primary boron-rich dilute solution; S2. reverse osmosis of the primary boron-rich dilute solution to obtain a reverse osmosis concentrate; S3. nanofiltration of the reverse osmosis concentrate to remove boron and obtain a nanofiltration lithium concentrate; S4. mixing of the nanofiltration lithium concentrate and hydrochloric acid and then secondary electrodialysis to obtain a secondary low-boron lithium concentrate; the secondary low-boron lithium concentrate is returned to step S1 and mixed with the salt lake brine; and the water inlet of the primary electrodialysis and the secondary electrodialysis is controlled to have a pH of 7-12. The method provided by the application effectively improves the enrichment and purification efficiency of lithium and the removal efficiency of boron, and is simple and easy to implement. The application further provides an integrated system for implementing the above method.

The application provides a method for separating rare earth and iron aluminum boron from neodymium iron boron calcined material leaching solution. The method provided by the application comprises the following steps: obtaining neodymium iron boron calcined material leaching solution containing rare earth, aluminum, iron and boron based on hydrochloric acid preferential dissolution method, adding an oxidizing agent after adjusting the pH of the leaching solution to 3-5, stirring and reacting, and separating to obtain an iron-containing precipitate and an iron-removed solution; using an organic extractant to extract boron from the iron-removed solution to obtain a boron-containing organic phase and a boron-removed solution; adjusting the pH of the boron-removed solution to 4-5, and then performing deep hydrolysis to remove aluminum, and filtering and separating to obtain an aluminum-containing precipitate and a purified rare earth solution for extracting and separating rare earth; using deionized water or an alkaline solution to back-extract boron from the boron-containing organic phase, recycling the organic phase, and concentrating the back-extraction solution to obtain a boron-containing crystalline product. The method provided by the application can recover boron in the neodymium iron boron calcined material leaching solution, is conducive to the removal of aluminum by hydrolysis and reduces the loss of rare earth, and greatly reduces the environmental pressure and the subsequent wastewater treatment pressure.

The invention belongs to the technical field of surface modification of boron powder, and particularly relates to a process for excessively adding boron powder into an energetic material. The process comprises the following steps: modifying a boron powder raw material by using a phthalic ester coupling agent as a modifier to obtain modified boron powder; the preparation method comprises the following steps: adding stearic acid into an energetic material, heating and mixing, and then adding a surfactant to obtain a mixed solution; and adding the modified boron powder into the mixed solution in batches, and stirring and dispersing until no particles or sedimentation is generated. After the boron powder is modified by the titanate coupling agent, the viscosity of the obtained modified boron powder system is remarkably reduced, and the modified boron powder system has good lubricity and rheological property. When the boron powder is used in an energetic material, the addition amount of the boron powder can be remarkably increased by adding the surfactant into the energetic material such as hydrocarbon fuel. The energy level of the liquid energetic material is improved by adding the modified boron with high energy density, and the maximum addition amount of the boron powder in aviation kerosene can reach 78.6% due to excessive addition of the boron powder in aviation kerosene.

The invention relates to the technical field of a novel negative electrode of a lithium ion battery, in particular to a boron-doped porous carbon gas-phase silicon-carbon composite negative electrode material and a preparation method of the boron-doped porous carbon gas-phase silicon-carbon composite negative electrode material. The boron-doped spherical porous carbon is obtained by template agent mixing, boron source doping, spheroidizing agent and initiator adding, spheroidizing polymerization reaction, impurity removal and drying, and gas-phase etching pore forming. And sequentially depositing silicon in the porous carbon holes and depositing a carbon layer on the surface of the silicon-carbon precursor through two times of chemical vapor deposition to finally prepare the boron-doped porous carbon vapor-phase silicon-carbon composite negative electrode material. The electron conductivity is optimized through boron element doping, a lithium ion transmission channel is improved through a spheroidized porous carbon structure, the rigidity of a matrix is enhanced, and the excellent performance of high magnification, low expansion and long circulation of the material is achieved; the problems that in the prior art, an existing gas-phase silicon-carbon composite negative electrode material is insufficient in rate capability, low in matrix strength and blocked in lithium ion transmission are solved.

The invention relates to a method for extracting boron from boron-containing brine based on polyol two aqueous phases, and the method comprises the following steps: (1) uniformly mixing a boron-containing brine solution, a polyol extraction agent and a first salting-out agent, and carrying out first pH value adjustment to obtain a mixed solution A; (2) carrying out extraction separation on the mixed solution A obtained in the step (1) to obtain a boron-loaded polyol solution and raffinate; (3) uniformly mixing the boron-loaded polyol solution obtained in the step (2), a stripping agent and a second salting-out agent, carrying out second pH value adjustment to obtain a mixed solution B, and carrying out stripping separation to obtain a boron-containing stripping solution and regenerated polyol; according to the method, no organic diluent is used in the extraction and back extraction processes, and the method is environmentally friendly, small in phase interfacial tension, high in phase splitting speed and high in extraction efficiency and has the advantages of being easy to operate, green, efficient and the like.

The application provides a method for preparing boronene by vacuum thermal decomposition, which comprises the following steps: ball milling a metal boride block in an inert atmosphere to obtain a metal boride powder; tabletting the metal boride powder to obtain a metal boride flake; vacuum thermal decomposition of the metal boride flake in a vacuum reaction environment; solid-liquid separation of the obtained product after mixing with water to obtain a solid; washing the solid with an acidic solution until neutralization; and freeze-drying to obtain boronene; wherein the metal boride comprises MgB2 and / or AlB2. The method has a low vacuum thermal decomposition temperature, low preparation cost and high production efficiency. The preparation method occurs in a closed vacuum environment, and there is no secondary oxidation problem of raw materials and products, no solid impurity pollution, and the method is green and safe. The prepared boronene has high purity, high yield and uniform size.

Hollow tubes or fibers, methods of making hollow tubes or fibers, and uses thereof. In various examples, a hollow tube or fiber (e.g., a borophene tube or fiber or the like) comprises a single or plurality of single layers of boron atoms, where each single layer is crystalline, comprises χ3, β 12, δ6, α, Pmmn, Pmmm, α-icosohedral, or β-icosohedral phase borophene, comprises hexagonal pyramidal and / or icosahedral unit(s) or group(s), or any combination thereof. In various examples, a method of making a hollow tube or fiber comprises exfoliation (e.g., by mechanically mixing and / or agitation) of a boron precursor, such as, for example, a boron powder or crystal, under pressure. Hollow tubes or fibers can be used in various applications and devices, such as, for example, energy or gas storage, sensing, field emission, thermal conductivity, molecular electronic, structural, fiber / fabric, biomedical, electronic, or molecular electronic, filtration, or catalysis, or the like applications or devices, or in materials, such as, for example, conducing adhesives, or thermal or reinforcing materials.

The invention discloses a Zr-based MOF boron adsorbent as well as a preparation method and application thereof. The prepared Zr-DHTP and Zr-BTEC materials have excellent saturated adsorption capacity, and compared with commercial boron adsorption resin IRA-743, the adsorption capacity of the Zr-DHTP and Zr-BTEC materials is improved by 5.6 times and 8.7 times respectively. In a complex system in which common ions (such as Na, K, Ca2, Mg2 and the like) coexist, the material not only maintains high adsorption capacity, but also shows a synergistic promotion effect, and shows good selective adsorption performance. In addition, the adsorbent shows efficient boron absorption capacity in a real brine system, the adsorption process is stable, and the adsorbent has excellent cyclic regeneration performance. In conclusion, the zirconium-based metal organic framework Zr-MOF boron adsorbent has outstanding performance in the aspects of selective separation and enrichment of boron, can be widely applied to the fields of salt lake brine boron extraction, electro-catalysis, photocatalysis, photoelectrochemical cells, electrode materials, supercapacitors and the like, and has remarkable scientific research value and industrial application prospect.

The application discloses a plant biomass cellulose-based boron adsorbent, which comprises a substrate and a ligand grafted on the substrate, the substrate is cellulose grafted glycidyl methacrylate synthesized based on plant biomass cellulose, and the ligand is selected from any one of N-methyl-D-glucose, tris(hydroxymethyl) aminomethane, glycidyl-functionalized ethylenediamine and aldehyde glucose. A preparation method comprises the following steps: obtaining plant biomass cellulose based on plant biomass material; using plant biomass cellulose and glycidyl methacrylate monomers as raw materials, synthesizing cellulose grafted glycidyl methacrylate by adopting an ATRP method; and grafting polyol ligands onto the cellulose grafted glycidyl methacrylate by a hydrothermal reaction, to obtain the plant biomass cellulose-based boron adsorbent. The synthesis method of the boron adsorbent is green and simple, the cost is low, the adsorption capacity is large, and the method is favorable for large-scale application.

The present disclosure provides a method for preparing a powder material and an application thereof. The preparation method includes: obtaining an initial alloy ribbon including a matrix phase and a dispersed particle phase by solidifying an alloy melt, and then removing the matrix phase in the initial alloy ribbon while retaining the dispersed particle phase, so as to obtain a powder material composed of original dispersed particle phase. The preparation method of the present disclosure is simple in process and can prepare multiple powder materials of nano-level, sub-micron-level and micro-level. The powder materials have good application prospects in the fields such as catalytic materials, powder metallurgy, composite materials, wave-absorbing materials, sterilization materials, metal injection molding, 3D printing and coating.

The present application relates to the field of carbon materials, in particular to a modified high boron and nitrogen phenolic resin-based material, a preparation method and application thereof. The preparation method is to prepare the modified high boron and nitrogen phenolic resin-based material by co-condensation reaction of a modifier, 3-hydroxyphenylboronic acid and formaldehyde and carbonization. The modifier is selected from one of melamine, melamine OAT waste residue and urea. The present application introduces nitrogen-containing groups into the molecular chain segments of phenolic resin to prepare carbon materials with high boron and nitrogen content and high specific surface area. The preparation method is simple and easy to operate, and the carbon material product shows good electrochemical performance. The modified high boron and nitrogen phenolic resin-based material prepared by the present application can be applied to the field of electrode materials or catalytic materials.

The present application provides a kind of amorphous boron powder surface oxide layer removal method and propellant for amorphous boron powder, and amorphous boron powder surface oxide layer removal method includes the following contents: amorphous boron powder with surface coated with oxide layer is added to strong polar solvent, and amorphous boron powder suspension liquid is obtained;In the temperature range of 80-100 ℃, amorphous boron powder suspension liquid is ultrasonically dispersed for 4-6 h, and mechanical stirring is continuously carried out during ultrasonic dispersion, and amorphous boron powder dispersion liquid is obtained;After amorphous boron powder dispersion liquid is filtered, filter cake is obtained, filter cake is washed with low boiling point solution for 1-3 times, and then vacuum drying is carried out in vacuum drying apparatus at room temperature for 24-48 h, and amorphous boron powder removed surface oxide layer is obtained;The method of the present application is simple and controllable, and can be applied to large-scale preparation.The present application can effectively remove most of the oxide layer on the surface of boron powder, improve the purity of boron powder by more than 4%, and help to improve the charging process of boron powder in propellant system.

This invention discloses a ternary boron nanosphere particle, its preparation method, and its application. A mixed suspension of boron and titanium nanoparticles is sprayed into a nitrocellulose suspension, heated and stirred to allow the boron and titanium nanoparticles to enter the nitrocellulose, forming a mixed solution. An organic solvent is added to the mixture, and the mixture is heated and stirred to dissolve the nitrocellulose with ethyl acetate and coat the boron and titanium nanoparticles, forming a ternary aggregate. A gelatin aqueous solution is then added, and the mixture is heated and stirred, filtered, and dried to obtain the ternary boron nanosphere particles. The high-energy composite material prepared by this invention uses NC as a carrier and binder. The prepared spherical particles have a dense structure and uniform size; they simultaneously possess both a metallic combustion accelerant and a metallic fuel, enabling a sustained and vigorous reaction that releases enormous energy. They can be used as a raw material for boron-rich solid propellants, achieving stable combustion of solid propellants under low pressure and improving combustion efficiency. The synthesis method of this invention is green, safe, and easy to industrialize.

The present disclosure provides a method for preparing a powder material and an application thereof. The preparation method includes: obtaining an initial alloy ribbon including a matrix phase and a dispersed particle phase by solidifying an alloy melt, and then removing the matrix phase in the initial alloy ribbon while retaining the dispersed particle phase, so as to obtain a powder material composed of original dispersed particle phase. The preparation method of the present disclosure is simple in process and can prepare multiple powder materials of nano-level, sub-micron-level and micro-level. The powder materials have good application prospects in the fields such as catalytic materials, powder metallurgy, composite materials, wave-absorbing materials, sterilization materials, metal injection molding, 3D printing and coating.

The present application relates to the field of modification of phenolic resin, in particular to cashew phenol and boron double modified phenolic resin based material and its preparation method and application. The preparation method is to add 3-hydroxyphenylboronic acid, cashew phenol, formaldehyde and alkaline catalyst into solvent, stir and react at 100-200 DEG C for 1-24h to obtain 3-hydroxyphenylboronic acid / cashew phenol copolymerization resin microspheres, and obtain phenolic resin based material after carbonization, wherein the phenolic resin based material is spherical carbon material. The preparation method directly uses monomer (3-hydroxyphenylboronic acid) with high boron content as raw material, prepares carbon microspheres with high boron content, and improves the pyrolysis effect and specific surface area by introducing the second phenol (cashew phenol).