641results about How to "No loss" patented technology

The invention provides a device and method for improving charging and discharging safety, and the device comprises a bidirectional DC / DC module and a bidirectional DC / AC module which are connected with each other, and the bidirectional DC / DC module comprises a bidirectional Boost / Buck module and a bidirectional LLC module which are connected with each other; the bidirectional DC / DC module is connected with charging and discharging equipment, and the bidirectional DC / AC module is connected with a power grid; the bidirectional DC / DC module comprises a bidirectional Boost / Buck module and a bidirectional LLC module which are cascaded to realize a bidirectional DC / DC function; wherein the bidirectional Boost / Buck module is used for bidirectional step-up / step-down of direct-current voltage, and the bidirectional LLC module adopts an open-loop design and is used for electrical isolation of a charging and discharging equipment side and a power grid side. Based on the control strategy of the awakening circuit and the dormancy circuit, the working stress of the charging and discharging device is reduced, the service life attenuation of the hardware circuit is delayed, and the charging and discharging function failure is reduced, so that the purpose of improving the safety of the charging and discharging equipment is achieved.

The invention discloses a permanent magnet rotor surface-mounted magnetic steel mounting structure and method, and belongs to the technical field of motors, the permanent magnet rotor surface-mounted magnetic steel mounting structure comprises a rotor, a magnetic steel guide assembly is arranged above the rotor, the magnetic steel guide assembly comprises a plurality of pieces of simulation magnetic steel, the magnetic steel guide assembly is used for mounting magnetic steel to be mounted, and a mounting assembly is arranged at the bottom of the rotor. A plurality of locking assemblies are arranged on the mounting assembly, a plurality of magnetic steel mounting parts are arranged on the rotor, magnetic steel and a magnetic yoke before mounting are separated through a magnetic steel guide assembly tool, in the matching process of the magnetic steel and the magnetic yoke, the hand is evacuated to a safe position, safety risks are avoided, a magnetic steel pushing mode is not adopted, adsorption is prevented through a non-magnetic-conductive material, and the magnetic steel is prevented from being damaged. Glue pressing is used for replacing glue pushing, smooth installation of the surface-mounted magnetic steel is achieved, material loss is avoided, and the phenomenon that poor installation is prone to occurring in the mutual exclusion process of the magnetic steel, and the performance of a motor is affected is avoided.

The invention relates to a container ship methanol fuel daily cabin arrangement form, and belongs to the technical field of ship design and manufacture, the container ship methanol fuel daily cabin arrangement form comprises a methanol fuel daily cabin and a methanol fuel preparation room, the methanol fuel daily cabin is arranged on one side of an engine room above a main deck, and the methanol fuel preparation room is arranged on one side of an engine room below the main deck; and the methanol fuel daily cabin and the methanol fuel preparation room are adjacently arranged up and down. For a large container ship, the length of a traditional cabin shed is generally about 6 m, and in order to guarantee the volume of the methanol fuel daily cabin, the width of the methanol fuel daily cabin and the height of a top deck can be adjusted according to needs.

The invention discloses a preparation method and application of high-water-solubility dihydroquercetin for cosmetics, and belongs to the technical field of compound extraction.The preparation method comprises the steps that larch roots are dried and smashed, soaked in cold water and filtered, filter residues are extracted through plate-frame pressure filtration, an extracting solution is concentrated, alcohol precipitation is conducted, an alcohol solution is concentrated and refrigerated till crystals are separated out, and the high-water-solubility dihydroquercetin is obtained. Adding the crystal into an inclusion solution, filtering after reaction, adding a composite decolorizing agent into the filtrate, filtering again, adjusting the pH value to be neutral, diluting until the solid content of the filtrate is 3 + / -0.5%, passing through a column, concentrating, and spray-drying to obtain the high-water-solubility dihydroquercetin for cosmetics, which is in a powder state and light in color. The composition has a good anti-wrinkle effect, a tightening effect and a soothing effect, and can be used for preparing cosmetics.

The invention relates to the technical field of shield construction, and provides a subway station shield path analogue simulation U-turn construction method which comprises the following steps: establishing a three-dimensional model of a subway station, and simulating and generating a shield tunneling machine U-turn path and a rear matched trolley path; importing the three-dimensional model into test software, adding the motion path generated by simulation, and performing three-dimensional collision inspection; exporting constraint force position data; based on the shield tunneling machine U-turn path generated through simulation and the exported constraining force position data, a supporting piece is installed; the bracket and the shield tunneling machine on the bracket are pushed by the jack, so that the shield tunneling machine moves to a target position according to the shield tunneling machine turning-around path generated through simulation; trolley bodies of the rear matched trolley are fixed to the U-turn platform one by one, and the U-turn platform where the trolley bodies are fixed is dragged by a battery car to move to the starting side platform area. According to the method, path analogue simulation and site construction optimization are combined, the U-turn construction path is effectively controlled, the construction efficiency is greatly improved, and the construction safety risk is reduced.

The invention discloses a preparation method of a semiconductor material and a device, and the method comprises the steps: preparing two substrates, namely a substrate W1 and a substrate W2, stripping a part of the upper part of the substrate W2, bonding the part with a polycrystal Si C surface 110 grown on the substrate W1, forming a polycrystal SiC layer on the W1 and a high-quality single crystal S iC layer on the polycrystal SiC layer, and carrying out the epitaxy of the high-quality S iC layer to form a composite epitaxial material. The chip manufacturing is completed by performing chip process processing on the composite epitaxial material, so that the loss and waste of the SiC material in the preparation process of the SiC material and the device can be effectively reduced, the production efficiency is improved, and the great reduction of the cost of the device is facilitated.

The invention relates to a method for producing industrial-grade phosphoric acid from wet-process phosphoric acid raffinate acid, and belongs to the technical field of wet-process phosphoric acid. The technical problem to be solved by the invention is to provide a low-cost method for producing industrial-grade phosphoric acid from wet-process phosphoric acid raffinate. The method comprises the steps of pretreatment, metal ion extraction, pretreatment, phosphoric acid extraction, washing, phosphoric acid reverse extraction, concentration and the like, and finally industrial-grade phosphoric acid is obtained. The method adopts the raffinate acid as the raw material to prepare the industrial grade phosphoric acid, perfects and improves the wet-process phosphoric acid purification process, can utilize the original production equipment of a phosphorus purification enterprise, does not need to add new equipment, and is low in production cost. According to the method, phosphoric acid loss is avoided, all extracting agents can be recycled, associated metal elements in the raffinate acid can be recycled in a cascade classification mode, and cost is saved. The method is high in extraction efficiency, the content of metal impurity ions in the obtained product phosphoric acid is low, and the requirement of industrial grade phosphoric acid is met.

The invention relates to a hardware routing table look-up method based on segmented unified storage. The method comprises the following steps: firstly, acquiring an IPv4 / IPv6 routing prefix, dividing the IPv4 / IPv6 routing prefix into 1-4 address fields according to 32 bits, allocating a unique forward and backward segment identifier for each field, constructing table entries containing the segment identifiers, 32-bit segment data and a next hop, and uniformly storing the table entries into the same TCAM. During table lookup, segmenting an address to be looked up according to the same rule, querying the TCAM from a first segment by taking segment data as a key, and recording a backward segment identifier and a next hop after hit; and if the backward segment identifier is invalid, directly returning to the corresponding next hop, and if the backward segment identifier is valid, continuing query by taking the identifier and the next segment of data as a joint key. And when the table item is not hit or the identification verification fails, selecting the table item with the longest prefix and the valid next hop in the matched section, and returning to the next hop. According to the invention, IPv4 / IPv6 routing table entries can be uniformly stored, the TCAM space utilization rate is improved, and meanwhile, the hardware table look-up efficiency is guaranteed.

The invention discloses a cavity enhanced Fabry-Perot interference resonant cavity, and belongs to the technical field of sensing detection. The transduction film is used as a transduction medium, vibration is generated through induction, signals are converted into vibration of the film, optical signals are modulated, and information to be measured can be obtained. According to the invention, the cavity enhancement structure is introduced, the optical fiber collimator and the transduction film jointly form an interference resonant cavity, and the phase sensitization of the optical microcavity is realized by improving the reflectivity of the cavity and prolonging the time of capturing light. Through stable interference of the resonant cavity, strong optical constraint is generated, and interaction between a light beam and a transmission signal is enhanced. In addition to the characteristics of high sensitivity, small loss, small size and high integration, the device has high expandability in the design aspects of bandwidth and sensitivity, and good sensing performance and design flexibility of the device provide a new opportunity for propelling the military and civil fields such as monitoring technology and biomedicine.

The invention discloses a special aggregate for low-steam-curing-energy-consumption light-weight high-strength concrete and a preparation method of the special aggregate, and belongs to the technical field of building materials. The aggregate is boron nitride lightweight aggregate, and the boron nitride lightweight aggregate comprises the following raw materials: shale, fly ash and boron nitride; the mass ratio of the shale to the fly ash is (85-92): (8-15); the dosage of the boron nitride is 3%-20% of the total mass of the shale and the fly ash. The boron nitride lightweight aggregate is prepared through aging, granulation, sintering, ball milling and screening and replaces part of natural aggregate to be used for preparing the concrete, and on the premise that the strength of the concrete is not affected, the maintenance energy consumption of the concrete can be obviously reduced, and the dead weight of the concrete can be reduced; meanwhile, the additive can be used as a self-curing agent to promote the long-term strength increase of concrete.

The present invention relates to the field of semiconductor technology, and in particular to a gallium oxide diode. The gallium oxide diode comprises a gallium oxide wafer, a cathode electrode, an anode electrode and a P-type semiconductor. The gallium oxide wafer comprises a gallium oxide substrate layer and a gallium oxide epitaxial layer. The P-type semiconductor is n layers, where n is the number of layers and n≥2. The present invention provides a multilayer P-type semiconductor, and one end of the P-type semiconductor forms a PN junction with the gallium oxide epitaxial layer, and the PN junction can compensate for the charge on the depletion side. Through the depletion effect of the PN junction, non-ideal factors such as dangling bonds introduced by etching and fixed charges introduced by etching damage in the gallium oxide diode can be passivated, thereby reducing the resistance degradation caused thereby and improving the stability of the device. At the same time, the other end of the P-type semiconductor is connected to the anode electrode to form an equipotential body, which can promote the depletion of the side PN junction, and can also disperse the high electric field of the device from the original side to the end face, thereby achieving the purpose of reducing the electric field strength of the entire device.

The invention is suitable for the field of photovoltaic technology, and provides a solar cell, a cell assembly and a photovoltaic system, the solar cell comprises a silicon substrate, the silicon substrate is provided with a back surface and a front surface which are oppositely arranged; the diffusion layer is positioned in a first region on the back surface of the silicon substrate; the doped layer is located in a second area on the back face of the silicon substrate, the doped layer comprises at least one of doped amorphous silicon, doped microcrystalline silicon and doped polycrystalline silicon, and the doped layer and the diffusion layer are doped with different polarities; two opposite surfaces of the tunneling layer are respectively in contact with the diffusion layer and the doping layer; the first electrode is communicated with the diffusion layer, the second electrode is communicated with the doping layer, and the first electrode is not communicated with the doping layer; the connection depth of the first electrode extending into the diffusion layer is greater than the connection depth of the second electrode extending into the doping layer. The hot spot risk can be reduced, the overall performance of the solar cell can be improved, and particularly the charge collection efficiency and the current transmission stability of the solar cell can be improved.

The invention relates to an acetylene selective hydrogenation catalyst and a preparation method and application thereof, and relates to the technical field of catalysts, the acetylene selective hydrogenation catalyst comprises the following components by weight percentage: 0.02-0.08 wt.% of Pd, 0.1-0.5 wt.% of Ag, 0.1-0.5 wt.% of Ni, 0.1-0.5 wt.% of Ti, 0.1-0.5 wt.% of Ti, 0.1-0.5 wt.% of Ti, and the balance of Fe. The catalyst comprises the following components in percentage by weight: 0.5-5wt% of alkali metal and the balance of an aluminum oxide carrier. The acetylene selective hydrogenation catalyst provided by the invention is stable in active component, relatively high in strength and strong in adaptability, so that the catalyst has excellent catalytic activity and stable operation capability in a relatively wide temperature range, and the defects in the prior art are overcome.

The utility model provides full-automatic quantitative feeding equipment for casting, which comprises a rack serving as an equipment fixing and mounting frame, a control system for controlling a feeding process, a cup feeding mechanism, a quantitative combined scale, a translation mechanism, a clamping mechanism and a turnover assembly, empty material cups enter from the cup feeding mechanism and are moved to a blanking port of the quantitative combination scale, the quantitative combination scale weighs raw materials with set weight and puts the raw materials into the empty material cups, the translation mechanism moves the material cups filled with the raw materials to the clamping station, and the clamping mechanism moves the material cups filled with the raw materials into the turnover assembly. The utility model further provides a full-automatic quantitative feeding method for casting, and the full-automatic quantitative feeding device for casting is utilized. According to the full-automatic quantitative feeding device for casting, full automation of the casting feeding procedure is achieved, a traditional quantitative combination scale and manual operation mode is replaced, and operation efficiency is improved.

The invention discloses an integer slot concentrated full-pitch flat wire winding structure and a flat wire motor, and relates to the technical field of motors. Each branch of each phase of the integral-slot concentrated whole-pitch flat wire winding structure comprises one or more coil units, each coil unit is composed of four coil groups, each of the first coil group and the third coil group comprises a same-layer hairpin, the second coil group comprises N / 2-1 cross-layer hairpins, and each cross-layer hairpin comprises N / 2-1 cross-layer hairpins. The two effective conductors of the cross-layer hairpin are located on the adjacent layers of flat wires in different grooves, the fourth coil assembly is obtained by rotating the second coil assembly by m stator grooves in the circumferential direction, and m is the phase number of the winding motor. According to the invention, the stator adopts an integral pitch winding and is matched with a concentrated winding scheme that the number of slots per pole per phase is 1, so that the motor can obtain the maximum winding coefficient; only N / 2 + 1 types of hairpins are needed, and the types of the hairpins are reduced, so that the purposes of reducing the processing difficulty, the assembly complexity, the manufacturing cost and the maintenance difficulty of the flat wire winding are achieved.

The invention relates to a rapid disassembly and assembly sealing port for a quartz vacuum tube furnace. The rapid disassembly and assembly sealing port for the quartz vacuum tube furnace comprises a fixing ring, a fixing end cover, a buckle assembly and a port electrode. The fixing ring is arranged at the end part of the quartz tube. The fixing end cover is detachably arranged on the fixing ring, and a sealing ring is arranged between the fixing end cover and the fixing ring. The plurality of buckle assemblies are uniformly distributed along the edge of the fixed end cover, and each buckle assembly comprises a hook buckle and is used for quickly fixing the fixed end cover on the fixed ring so as to seal the quartz tube. And the port electrode is arranged in the fixed end cover and is used for particles generated by glow discharge to fly attached gas on the wall of the quartz tube, the fixed end cover and the surface of the material so as to reduce gas adsorption.

The invention relates to the technical field of environment monitoring, in particular to a sampling device and method for BVOCs flux measurement based on relaxation vortex accumulation. The method comprises the following steps: acquiring the temperature and light quantity of an environment in a measurement time period; calculating a temperature measurement coefficient based on the temperature of the environment measured in the measurement time period, calculating a light quantity measurement coefficient based on the light quantity of the environment measured in the measurement time period, and recording the sum value of the temperature measurement coefficient and the light quantity measurement coefficient as a measurement activation value of the measurement time period; the measurement value is obtained based on the measurement activation value, the environment where measurement is located is analyzed based on the measurement value, the actual situation of the natural environment is accurately reflected, the obtained BVOCs flux measurement result is more accurate, and the measurement accuracy is high. Furthermore, based on the wind speed data of the environment, the BVOCs flux measurement of the environment is completed through a relaxation vortex accumulation acquisition system based on the wind speed data, and the sampling efficiency is improved.

The utility model relates to a collapse alarm device which comprises a two-core optical cable, two ends of one optical cable are respectively connected with an optical fiber emitter and an optical fiber receiver, the optical fiber receiver is connected with a master controller, and the master controller is connected with a plurality of alarm lamps and an alarm. And the other optical cable is connected with an optical fiber breakpoint tester, and the optical fiber breakpoint tester is connected with the main controller. The two-core optical cable is pre-buried under a roadbed. According to the utility model, the optical cable is pre-embedded in the roadbed, when the road collapses, the optical fiber receiver cannot receive a signal so as to trigger an alarm mechanism, pedestrians can be prompted through the alarm lamp arranged along the road, and meanwhile, a prompt is given to operators on duty through the alarm, so that the problem of pavement collapse can be efficiently and timely solved; the personnel, the vehicle and the property are protected from greater loss, and the safety of the road or the embankment can be guaranteed in all weathers.

The present invention discloses an ocular implant delivery device, comprising a housing, a rotating wheel, a push-needle connecting rod assembly, a retraction connecting rod assembly, a sleeve and a puncture needle, a through hole is provided in the direction of the distal end of the housing, the sleeve passes through the through hole from the housing and extends to the outside of the housing, the sleeve is fixedly connected to the housing, the puncture needle passes through the sleeve, the proximal end of the puncture needle is fixedly connected to the retraction connecting rod assembly, the push needle of the push-needle connecting rod assembly passes through the inner hole of the puncture needle, the rotating wheel is connected in the housing through a rotating shaft, an opening corresponding to the rotating wheel is provided on the housing, the rotating wheel is respectively connected to the push-needle connecting rod assembly and the retraction connecting rod assembly through a gear rack mechanism, and as the rotating wheel rotates, the push-needle connecting rod assembly can be driven to move toward the distal end of the housing or the retraction connecting rod assembly can be driven to move in a direction away from the distal end of the housing. The present invention has a simple structure, is easy to operate, can improve the accuracy and safety of surgery, and makes surgery more labor-saving, and has higher system stability and reliability.

The invention discloses a high-voltage direct-current power transmission system oscillation suppression method based on MMC negative-sequence impedance remodeling. The method comprises the steps that equivalent admittance of a new energy unit considering MMC impedance characteristic influence is established; mMC negative sequence impedance remodeling control based on virtual parallel impedance is constructed; and designing control parameters considering impedance coupling degree constraint. According to the invention, the oscillation phenomenon of the system can be effectively suppressed, and safe and stable operation of the high-voltage direct-current power transmission system is ensured.

The invention provides a traffic scheduling method and system, electronic equipment and a storage medium. The method comprises the following steps: acquiring VPC traffic and a current cluster traffic utilization rate based on a traffic scheduling request; if it is determined that the programmable chip switch cluster can bear the VPC traffic, performing routing configuration on the programmable chip switch cluster according to a routing table generated by VPC instance information, and performing routing configuration on a boundary switch according to a scheduled VPC and a traffic scheduling request; modifying the next-hop VIP address into the VIP address of the programmable chip switch cluster; sending the VPC flow to an IDC (Internet Data Center) through a programmable chip switch cluster and a boundary switch; the VPC network segment is issued to the boundary switch through the programmable chip switch cluster based on the received signaling, so that the boundary switch completes routing convergence; and the traffic generated by the IDC is sent to the host machine through the private line access switch, the boundary switch, the NFV server gateway cluster and the programmable chip switch cluster.

The invention discloses a composite hydrogel, a composite aerogel, a preparation method and an application. The preparation method of the composite hydrogel comprises the following steps: irradiating a mixed solution A with high-energy rays; wherein the mixed solution A comprises graphene oxide, an inorganic nano material, monomers of acrylic acid and derivatives thereof, water and an alcohol water-soluble compound; the inorganic nano material is selected from one or more of an MXene two-dimensional lamellar material, a metal oxide and a metal sulfide; in the mixed solution A, the content of the graphene oxide is 0.05-10 mg / mL, the mass ratio of the graphene oxide to monomers of acrylic acid and derivatives thereof is 1: (50-1000), and the mass ratio of the graphene oxide to the inorganic nano-material is 1: (0.1-100); the alcohol water-soluble compound accounts for 2-50% of the mixed solution A in percentage by mass. When the composite hydrogel and the composite aerogel are applied to the field of solar photo-thermal water evaporation, an evaporator is not prone to being blocked.

The invention discloses a continuous preparation method of lauroyl chloride, which comprises the following steps: heating and melting lauric acid to obtain lauric acid melt; the method comprises the following steps: preparing an overflow diode reactor, continuously introducing phosgene and lauric acid melt into a first tubular reactor, reacting at 50-100 DEG C to obtain a photochemical reaction solution, continuously overflowing the photochemical reaction solution into a second tubular reactor, continuously reacting the unfinished reaction solution, and driving light by nitrogen to obtain lauroyl chloride. The continuous preparation method disclosed by the invention has the advantages of simple process, low online liquid carrying amount, convenience in operation, low cost and the like, and the obtained product is low in chromaticity, high in purity, few in impurities, suitable for industrial production and wide in application prospect.

The invention relates to a method for efficiently separating metal elements from a solution containing manganese salt, and belongs to the technical field of chemical metallurgy. The method for efficiently separating the metal elements from the manganese salt-containing solution comprises the following steps: aiming at the vanadium-containing manganese salt-containing solution, adopting a process route 1; a process route 2 is adopted for a vanadium-free manganese-containing salt solution; the vanadium content in the vanadium-containing manganese salt-containing solution is more than 0.2 wt%. The method is simple in process, high in generation efficiency and low in cost. Compared with other manganese-containing solutions for recycling valuable metals, the method provided by the invention has the advantages that the obtained manganese carbonate is a high-purity product, meets the II-level standard of HG / T2836-2011, and has higher economic value.

The invention relates to the technical field of chemical substance detection, in particular to a lipid in-situ mass spectrometry method and device based on online selective enrichment-photoanalysis, and the method comprises the following steps: (1) extracting lipid in a sample into an alkaline protic solvent by adopting an in-situ liquid extraction technology to obtain an in-situ extraction system solution; (2) sucking the in-situ extraction system solution through a transmission pipeline under vacuum or negative pressure, and leading the in-situ extraction system solution to a mass spectrum for mass spectrum detection, wherein a titanium dioxide nano-particle coating is arranged in the transmission pipeline; and (3) after the lipid mass spectrum band in the in-situ extraction system solution is completely subjected to mass spectrum detection, irradiating the titanium dioxide nano-particle coating by adopting an ultraviolet lamp, continuously introducing the alkaline protic solvent, sucking the alkaline protic solvent through a transmission pipeline, and introducing the alkaline protic solvent to a mass spectrum for mass spectrum detection. According to the method disclosed by the invention, online selective enrichment of glycolipid can be realized while in-situ liquid extraction is carried out, meanwhile, the glycosphingolipid is directly analyzed by using ultraviolet light under the condition that solvent switching is not needed, the analysis rate of the glycosphingolipid on the surface of titanium dioxide and the operation convenience are greatly improved, and finally, the detection sensitivity of the glycosphingolipid is improved.

The invention relates to a device and a method for measuring the axial acceleration sensitivity of a circular tube hydrophone. The device comprises a base, a hasm, an end cover, a circular tube hydrophone to be measured, a top cover, a pre-amplifier, an accelerometer and a vibration exciter, wherein the base comprises a base plate and a semicircular pipe arranged in the center of the base plate in a protruding mode, and a plurality of installation holes of different sizes are formed in the base plate so that vibration exciters of different connectors can be installed in a matched mode; a lead groove is formed in the top of the semicircular pipe; the Hu is of a semicircular pipe structure, the pipe diameter of the Hu is matched with the semicircular pipe in the center of the base plate, and a plurality of threaded holes are formed in the middle of the inner wall of the Hu at intervals in the height direction. Through reasonable structural design, the primary hydrophone and the pre-amplification circuit are integrally designed, the axial acceleration response of the circular tube hydrophone can be compared and represented, and an important basis is provided for performance evaluation and application of the circular tube hydrophone.

The invention provides a method for comprehensively recovering lithium and cobalt from a waste lithium cobalt oxide battery positive electrode material, which comprises the following steps: (1) pretreating the waste lithium cobalt oxide battery positive electrode material to obtain a lithium cobalt oxide positive electrode active material; uniformly mixing the lithium cobalt oxide positive active material with a sulfenyl compound and a carbon source to obtain a mixture; the mixture is subjected to inert atmosphere roasting, grinding, leaching and filtering in sequence, and a lithium-containing solution and sulfur-containing filter residues are obtained; (2) carrying out acid leaching impurity removal on the sulfur-containing filter residues, and filtering to obtain cobalt sulfide residues; (3) roasting the cobalt sulfide slag in an oxygen atmosphere to obtain a roasted product; and (4) the roasted product is leached and filtered, and a cobalt sulfate solution and cobaltosic oxide are obtained. According to the method, soluble sulfate and high-purity cobalt oxide can be obtained, and the method is short in process, low in cost and high in lithium selectivity.

The invention provides a method and a system for extracting lithium by combining mineralizing brine and old brine. The method comprises a lithium extraction process of mineralizing brine and a lithium extraction process of old brine, the lithium extraction process of the mineralization brine is carried out in a first resin column ion exchange turntable and comprises adsorption, material ejection, leaching, desorption, liquid ejection and brine ejection which are carried out in sequence; and the step of extracting lithium from the old brine is carried out in a second resin column ion exchange turntable, and comprises adsorption, leaching, desorption and liquid jacking which are carried out in sequence. The method provided by the invention avoids dilution of the mineralization brine, has no loss of potassium, and significantly improves the comprehensive yield and purity of the rear-end lithium product; lithium extraction of salt lake brine and potassium extraction of carnallite ore drying are carried out synchronously, the lithium extraction link is advanced, the lithium extraction period is shortened, and continuous production all year round is guaranteed; the environmental damage problem is small, and the production transformation investment is small; in conclusion, the lithium extraction of the mineralizing brine and the lithium extraction of the old brine have remarkable practical significance on the utilization of salt lake resources.

The invention discloses a method for preparing neodymium iron boron magnetic powder by a chemical method, which comprises the following steps of: 1, mixing iron salt, an organic ligand and a solvent for coordination reaction to obtain an iron-based metal organic framework material; 2, dipping the iron-based metal organic framework material in the rare earth-fused salt mixed solution, and drying to obtain a dipping precursor; step 3, carrying out calcination and reduction reaction on the impregnated precursor to obtain a rare earth-iron precursor; and 4, mixing the rare earth-iron precursor with a reducing agent, and carrying out a reduction diffusion reaction. According to the method, an iron-based metal organic framework material is used as an iron source and a template, a dipping process is combined, a highly uniform and dispersed dipping precursor is obtained, the refined spherical neodymium iron boron magnetic powder is obtained through calcination, hydrogen reduction and a reduction diffusion reaction, and the magnetic powder is controllable in component and high in magnetic conductivity. The method is suitable for preparing the neodymium-iron-boron magnet with excellent magnetic performance and adjusting the composition and grain boundary distribution of the neodymium-iron-boron magnet.

The invention discloses a method for preparing D-calcium pantothenate from fermentation broth, and relates to the technical field of D-calcium pantothenate production.The fermentation broth of D-calcium pantothenate is subjected to flocculation and filter pressing and then enters an ultrafiltration membrane to be filtered, obtained ultrafiltration membrane clear liquid is extracted, subnatant is taken and enters a nanofiltration membrane to be concentrated, obtained concentrated liquid enters a chromatographic column to be eluted, and D-calcium pantothenate is obtained. And collecting a target component containing D-pantothenic acid, then adding a calcium chloride solution for reaction, collecting a reaction solution, cooling and crystallizing, carrying out suction filtration, washing, carrying out suction filtration again, and drying to obtain a finished product of D-calcium pantothenate. According to the method, production links are simplified, the production period is shortened, and the production efficiency is effectively improved; and the purity and yield of the product are improved, the purity is up to 99.5% or above, and the yield is up to 95% or above.