341 results about "Solid phase reactions" patented technology

The invention discloses a method for preparing an adsorbent from clay minerals and carbide slag, and belongs to the technical field of deep processing of natural nonmetallic minerals and preparation of heavy metal adsorption functional materials. According to the method, natural clay and carbide slag serve as raw materials, the composite adsorption material containing various metal active sites is prepared through a solid-phase reaction, and the composite adsorption material is suitable for efficient removal of high-concentration and low-concentration heavy metal ions. The raw materials are cheap and easy to obtain, the preparation process is simple and efficient, and the product has excellent performance, wide application and wide prospects.

The invention discloses a composite heavy metal adsorbent synthesized through mineral conversion and a preparation method of the composite heavy metal adsorbent, and belongs to the technical field of deep processing of natural nonmetallic minerals and preparation of heavy metal adsorption functional materials, and the main preparation method comprises the following steps: S1, crushing and crushing natural clay minerals, and sieving with a 80-mesh sieve to obtain mineral powder; s2, mixing the obtained mineral powder with a calcium compound, and carrying out ball milling; s3, adding a boron compound, and continuing ball milling; s4, adding water into a solid material obtained by ball milling according to a solid-to-liquid ratio of (1: 5)-(1: 20), putting into a microwave hydrothermal reaction kettle, adding an organic auxiliary agent, carrying out gradient heating to 100-200 DEG C, reacting for 30-120 minutes, then naturally cooling to room temperature, separating, drying and crushing; according to the invention, natural clay raw ore is taken as a raw material, and the borate-silicate composite adsorption material is prepared in a preparation mode of combining solid-phase reaction and microwave hydrothermal treatment, so that high-concentration and low-concentration heavy metal ions are efficiently removed.

The invention relates to the technical field of novel environment-friendly materials, in particular to a ZnO / ZnFe2O4 desulfurization adsorbent with a stable porous structure and a preparation method of the ZnO / ZnFe2O4 desulfurization adsorbent with the stable porous structure, and the preparation method of the ZnO / ZnFe2O4 desulfurization adsorbent with the stable porous structure comprises the following steps: step 1, preparing a zinc-iron salt mixed solution; preparing an alkaline mixed solution; step 2, dropwise adding the alkaline mixed solution prepared in the step 1 into the zinc-iron salt mixed solution while stirring, and adjusting the pH value to 9-10; then carrying out a water bath reaction to obtain a zinc iron-double metal hydroxide; 3, the zinc iron-bimetal hydroxide prepared in the step 2 is subjected to high-temperature calcination, and the ZnO / ZnFe2O4 desulfurization adsorbent with the stable porous structure is obtained.The zinc iron-bimetal hydroxide (ZnFe-LDH) serves as a raw material, under the high-temperature calcination condition, the ZnFe-LDH is decomposed to generate ZnO and Fe2O3, then the ZnO and the Fe2O3 are further subjected to a solid-phase reaction to generate ZnFe2O4 (excessive ZnO), and the ZnO / ZnFe2O4 desulfurization adsorbent with the stable porous structure is obtained. And finally, the ZnO / ZnFe2O4 desulfurization composite adsorption material is prepared.

The invention belongs to the technical field of batteries, and relates to an organic-inorganic compound halide solid electrolyte material, a preparation method thereof and a battery, the structural general formula of the solid electrolyte is (DaZc) m (at) (BdWe) n, D represents at least one of Sc, In, Y, Hf, Zr, Ta, Nb, Al, Mo, Ti, V, Ga, Sb, Cd, La, Ce, Pr, Sm, Nd, U, Eu, Er, Ho, Dm, Yb, Lu and Gy; z represents at least one of F, Cl, Br, I, O and S; b represents at least one of Li, Na, Ag, Cu, Cs, K, Mg and Ca; w is an organic acid ion. DaZc and BdWe are mixed in a water-free and oxygen-free environment, a solid-phase reaction is carried out, and the halide solid electrolyte is obtained. The halide solid-state electrolyte material provided by the invention can be simultaneously matched with an oxide positive electrode and a lithium metal negative electrode, is beneficial to solving the technical problem of poor matching property of an existing electrolyte material and the lithium metal negative electrode, and improves the energy density and the cycling stability of a solid-state battery.

The invention relates to a method for preparing lithium sulfide through a high-temperature solid-phase reaction. Weighing lithium carbonate and powdered sulfur, and putting the lithium carbonate and the powdered sulfur into an agate mortar for grinding; transferring the ground mixture into a high-temperature-resistant ceramic crucible, and putting the ceramic crucible into a vacuum tube furnace for presintering; after the presintering is finished, carrying out high-temperature reaction; after the reaction is finished, turning off a heating power supply of the vacuum tube furnace, and naturally cooling the crucible to room temperature in the furnace; after cooling is completed, opening a furnace door, and taking out the crucible to obtain a lithium sulfide crude product; putting the lithium sulfide crude product and the wear-resistant dispersing agent into the mortar, and grinding and crushing again; then screening by a standard screen to obtain lithium sulfide powder products with different particle sizes; the wear-resistant dispersing agent is prepared by reacting dioctadecylamine, an epoxy succinic acid polymer and ethidene diamine; the lithium sulfide prepared by the method disclosed by the invention has relatively high purity and yield.

The present invention discloses an abnormal thermal quenching near-infrared fluorescent ceramic and its preparation method and application. The chemical formula of the fluorescent ceramic is: (Lu 0.34+z Y 0.66‑y‑z Sc y )3(Sc 0.85‑x Al 0.15 Cr x )2Al3O 12 , 0.0005≤ x ≤0.02, x : y =1:(5‑10), x : z =1:(10‑20). y Sc 3+ The mole percentage of dodecahedral sites occupied, x Cr ions occupy the octahedron Sc 3+ The molar percentage of the lattice site. z is the Lu in the dodecahedron 3+ The molar percentage of the metering control. The ceramic green body is formed and sintered by using the acrylamide gel injection molding method combined with high temperature solid phase reaction. The luminescent center ion in the ceramic of the present invention presents a +3 valence state under the influence of the matrix microenvironment regulator (calcium carbonate, magnesium oxide and zirconium oxide, silicon dioxide, hafnium dioxide). The excitation peak of the ceramic is between 430nm-460nm, the half-height width is between 90nm-130nm, and the half-height width is between 150nm-160nm. o The luminous intensity at 200°C is 105%-165% of the room temperature. o The luminescence intensity at 400°C is 130%-200% of that at room temperature. When excited by a 430-460 nm excitation source, the emission wavelength ranges from 650 nm to 900 nm. The ceramic preparation process is simple, and the resulting anomalous thermally quenched near-infrared fluorescent ceramic is suitable for high-power near-infrared imaging and detection.

The present invention discloses an Al2O3 modified Yb2Si2O7 material for a hot end component surface environmental barrier coating, and its preparation method and application, belonging to the field of environmental barrier coating. The material is synthesized by a solid phase reaction combined with a sintering process. The obtained material contains both Yb2Si2O7 and Yb3Al5O 12 Compared with undoped Yb2Si2O7, the doped material is denser, has lower porosity and higher density, and at the same time, Yb3Al5O will be generated at high temperature after doping. 12 It will effectively improve the high-temperature corrosion resistance of Yb2Si2O7, increase its service life, and has good application prospects.

The invention relates to the technical field of soft magnetic ferrite materials, in particular to a preparation method of a high-permeability soft magnetic ferrite core material, which comprises the following steps: firstly, preparing FeSiCrBCu soft magnetic alloy powder with uniform components and controllable particle size through a single-roller quenching and hydrogen decrepitation process, and laying a structural foundation for excellent magnetic performance; and then a mechanical stirring-ultrasonic synergistic coating technology is utilized, so that the ferrite precursor uniformly coats the alloy powder, an effective core-shell structure is formed, and solid-phase reaction and crystal grain uniform growth during sintering are promoted. Besides, a multi-task deep learning model (MTL-DL) based on transfer learning is adopted to carry out multi-objective collaborative optimization on the sintering process, accurately match and dynamically adjust key parameters, and accurately regulate and control the material densification process, the grain size and the phase distribution on the microcosmic level, so that the problem that the microstructure and component uniformity are difficult to accurately control in the prior art is solved; therefore, the problems of poor material performance and high power loss are solved.

The invention relates to a method for semi-solid-phase synthesis of a polycyclic compound and an intermediate, a long chain is synthesized through solid phase, then two-step ring closing is performed to form a key intermediate, and simple derivation is performed on the basis of the key intermediate to obtain a PCSK9 antagonist compound. According to the invention, starting materials for solid-phase synthesis are selected, steric hindrance is effectively avoided, and solid-phase reaction and subsequent liquid-phase correlation cyclization can be smoothly carried out, so that the yield is improved, and the cost is reduced.

This invention discloses a high-entropy transition metal nitride ceramic material and its preparation method. The preparation method includes the following steps: mixing n kinds of transition metal nitride powders and m kinds of transition metal powders, vacuum drying to obtain a precursor; placing the precursor in a mold and performing pre-pressing treatment to obtain a pre-pressed sample; sintering the pre-pressed sample in a sealed environment at a temperature of 500–3500℃ and a pressure of 2–28 GPa to obtain the high-entropy transition metal nitride ceramic material; wherein n≥1, m≥0, and the total number of transition metal elements in the precursor is four or more. This invention improves the stability of the precursor and reduces the size and distance of particles within the precursor through two pressure treatments, achieving for the first time the synthesis of high-density, high-purity high-entropy transition metal nitride ceramic materials via solid-state reaction.

The invention relates to the field of catalysis, in particular to a method for preparing a nickel-based catalyst through a solid-phase reaction, the nickel-based catalyst and a preparation method of synthesis gas. The invention provides a method for preparing a nickel-based catalyst through solid-phase reaction, which comprises the following steps of: 1, respectively mixing cerium nitrate and a silicon dioxide carrier with water to obtain two mixed solutions, mixing the two mixed solutions, adding a dilute ammonia water solution to adjust the pH value, adding an ammonia water solution of nickel nitrate, uniformly mixing, transferring into a hydrothermal kettle, and carrying out hydrothermal treatment to obtain a nickel-based catalyst precursor; the catalyst is separated by rotary evaporation. And 2, sequentially carrying out high-temperature heat treatment on the catalyst in a vacuum atmosphere and a hydrogen atmosphere to obtain a catalyst product. The preparation method provided by the invention is a solid-phase reaction strategy and is generally a two-step preparation method. The catalyst prepared by the method is used in a methane dry reforming reaction, and can maintain extremely high catalytic activity and high stability.

The invention discloses a SbBr co-doped argyrodite type solid electrolyte and a preparation method thereof.The preparation method comprises the steps that Li2S, LiCl, P2S5 and SbBr3 are weighed according to the stoichiometric ratio and then subjected to ball milling treatment, and mixed powder is obtained; the mixed powder obtained in the step S1 is subjected to compression molding and placed in a muffle furnace to be heated and calcined, and a solid-phase reaction is conducted; and after the reaction is finished, naturally cooling to room temperature, and grinding to obtain the SbBr co-doped argyrodite type solid electrolyte. According to the preparation process of the argyrodite type solid electrolyte, a traditional solid-phase sintering process is adopted, the synthesis process is simple, and the repeatability is high. The ionic conductivity of the argyrodite type solid electrolyte prepared by the process can reach 10.4 mScm <-1 > at room temperature. The argyrodite type solid electrolyte prepared by the invention has high ionic conductivity and excellent air stability, and meets the requirements of industrial large-scale production. When the solid-state electrolyte provided by the invention is assembled into an all-solid-state battery, the cycle life of the all-solid-state battery can be remarkably prolonged due to good compatibility with lithium metal.

The invention discloses a method for preparing YAG transparent ceramic by two-step sintering, which comprises the following steps: 1) weighing yttrium oxide powder and aluminum oxide powder according to a stoichiometric ratio, mixing, and carrying out solid-phase reaction to synthesize YAG powder; 2) performing dry grinding and wet grinding on the obtained YAG powder to obtain mixed slurry; 3) drying the obtained mixed slurry to obtain powder, and performing compression molding and cold isostatic pressing to obtain a ceramic biscuit; and 4) pre-sintering the obtained ceramic biscuit in an oxygen-containing atmosphere, embedding the pre-sintered ceramic with oxide particles, and carrying out hot isostatic pressing sintering to prepare the YAG transparent ceramic. On the basis of obtaining the YAG transparent ceramic with high optical quality, a microstructure with a fine grain size can be obtained, and good mechanical properties are considered; the preparation method is simple, the equipment cost and energy consumption are low, the traditional annealing step can be omitted, and a new thought can be provided for preparation of the high-performance YAG transparent ceramic.

The invention relates to an ultra-pure calcium fluoride crystal raw material and a preparation method thereof. The preparation method of the hyperpure calcium fluoride CaF2 crystal raw material comprises the following steps: (1) respectively weighing a calcium source and a fluorine source according to the stoichiometric ratio of elements in CaF2, and carrying out vacuum drying to remove adsorbed water and bound water so as to obtain a dehydrated calcium source and a dehydrated fluorine source; (2) mixing the dehydrated calcium source, the dehydrated fluorine source and absolute ethyl alcohol, and carrying out ball milling to obtain a white pasty mixed raw material; and (3) carrying out vacuum high-temperature heat treatment on the white pasty mixed raw material, carrying out solid-phase reaction on calcium ions and fluorine ions to generate calcium fluoride, cooling after the reaction is finished to obtain white powder, and grinding and crushing to obtain the ultra-pure calcium fluoride crystal raw material.

The invention belongs to the technical field of solid-state batteries, and particularly discloses an active halide solid-state electrolyte material and a preparation method and application thereof, the active halide solid-state electrolyte material comprises an active halide solid-state electrolyte represented by the following formula: xLia A.MyN (1-y) B (ym + n-yn), and carrying out solid-phase reaction on the LiaA and the MBm or carrying out solid-phase reaction on the LiaA, the MBm and the NBn in an inert atmosphere to obtain the active halide solid electrolyte. The active halide solid electrolyte material has relatively high ionic conductivity, can be used as an electrolyte material, can also be used as an electrolyte additive self-sacrifice material to be applied to an electrolyte layer, can also be applied to a positive electrode of a solid-state lithium ion battery to provide capacity for the battery, and is beneficial to improving the energy density of the solid-state battery.

The invention relates to the technical field of electrodes for vanadium batteries, in particular to a preparation method of a catalytically active electrode for a vanadium battery, the catalytically active electrode and application of the catalytically active electrode. The preparation method comprises the following steps: loading a bismuth oxide water-phase dispersion liquid as a precursor on the surface of a graphite felt electrode substrate, placing the graphite felt electrode in an inert atmosphere to carry out a carbon thermal reduction reaction, and carrying out a solid-phase reaction on bismuth oxide and the graphite felt carbon substrate in the inert atmosphere to generate a strongly combined catalytic active site in situ. By pertinently controlling the concentration of the bismuth oxide water-phase dispersion liquid and the temperature of the carbon thermal reduction reaction, active components in the prepared catalytic active electrode for the vanadium battery are uniformly and firmly combined on the surface of a matrix, and high uniformity and high stability are shown. And meanwhile, a loading-first and one-step carbon thermal reduction method is adopted, so that large-scale production can be realized, the electrochemical activity of the product is effectively improved, the uniformity and consistency of the performance can be realized, and the multi-dimensional strict requirements of commercial production on the electrode performance and the manufacturing efficiency are effectively met.

Processes for the production of powder materials are provided, and the resulting powder materials and electrodes are also provided.The processes include providing a starting powder with starting particles, each containing an electroactive material; coating the starting particles with a dopant compound containing a dopant material to define coated particles of an intermediate powder; exposing the coated particles to a reducing agent containing fluorine; and performing a heat treatment on the coated particles while exposed to the reducing agent at an elevated temperature and for a period of time sufficient to cause a solid-state reaction and diffusion of the dopant material into the electroactive material to form a doped region within the electroactive material and thereby define doped particles of a final powder material.The doped area extends at least one nanometer into the electroactive material, and the fluorine reacts with oxides that are formed on the surfaces of the coated particles.

The application relates to a preparation method of high-intermediate low-loss garnet ferrite with high bismuth substitution, and belongs to the field of microwave ferrite materials. 3+ The application reduces the volatilization of Bi by adding a small amount of H3BO3 and Bi2O3 as additives in the two-milling process, accelerates the growth of the crystal under the driving of the low-melting-point Bi2O3 additive in the sintering process, and accelerates the growth of the crystal under the driving of the low-melting-point Bi2O3 additive in the sintering process. 3+ The volatilization of Bi in the pre-sintering process is reduced by using a lower pre-sintering temperature, the optimal sintering temperature is wider, and the microstructure of the material is effectively improved. 3+ The volatilization of Bi in the sintering process is compensated by using a three-stage progressive holding sintering method in the high-temperature section of the final sintering, the sintering temperature and the holding time are controlled, the crystal grain growth is reduced after the continuous growth of the crystal grain, and the uniformity of the solid-phase reaction is improved.

The invention discloses a preparation method of FePS3, which comprises the following steps: mechanically mixing pyrite powder, sulfur-containing small molecules and elemental phosphorus, calcining the fully mixed powder in two temperature stages under a protective atmosphere, and cooling to obtain FePS3 nano-powder; wherein in the first temperature stage, the temperature is 200-300 DEG C, and the heat preservation time is 120-240 minutes, and in the second temperature stage, the temperature is 400-600 DEG C, and the heat preservation time is 120-180 minutes; the sulfur-containing small molecules are thiourea, thioacetamide or a mixture of the thiourea and the thioacetamide; the molar ratio of sulfur atoms to phosphorus atoms in FeS2 molecules and sulfur-containing small molecules in the pyrite powder is (1: 3: 5)-(1: 1: 5). According to the method, pyrite is used as an iron source and a sulfur source, sulfur-containing small molecules are used as a second sulfur source, and the FePS3 nano-powder is directly obtained through solid-phase reaction with the simple substance phosphorus without additional purification treatment. The method is low in solid-phase reaction temperature and simple in process, does not need harsh reaction conditions, and is easy for large-scale production.

A method for limiting void formation in a melt-infiltrated ceramic matrix composite (MI-CMC) component includes arranging one or more infiltrant feedstocks in fluid communication with a targeted area of the MI-CMC component. The one or more infiltrant feedstocks have a nominal melting point at or below a nominal melting point of an alloy within the MI-CMC component. The method includes heating the one or more infiltrant feedstocks to a first temperature at or above the nominal melting point of the one or more infiltrant feedstocks to form a molten phase. The method also includes infiltrating the targeted area of the MI-CMC component with the molten phase. As such, the molten phase reacts with a solid phase in the targeted area of the MI-CMC component. Further, the method includes cooling the MI-CMC component to a second temperature that is below the first temperature to solidify the molten phase.

The application relates to a dual-phase high-entropy ceramic material for high-temperature thermal barrier coatings and a preparation method thereof, in particular to a dual-phase high-entropy ceramic (La 0.2 Nd 0.2 Gd 0.2 Y 0.2 Ho 0.2 )2Zr2O7 with low thermal conductivity and high thermal expansion coefficient, which is mainly used for thermal isolation, thermal barrier coatings and other applications in high-temperature environments. The application is prepared by adopting a solid-phase reaction sintering process through accurate design of the combination of rare earth elements, forms a stable dual-phase structure, effectively inhibits grain growth through grain boundary pinning, and thus maintains a nanoscale grain structure. Meanwhile, the material can efficiently block heat transfer at high temperatures through optimization of phase proportion, and the thermal expansion characteristics are matched with a metal base layer, effectively avoiding the falling risk caused by the difference in thermal expansion of the two, and thus greatly improving the service life and reliability of the material in a high-temperature environment. The high-entropy ceramic material of the application can be widely applied to fields with high demand for high-temperature thermal isolation in aerospace, aviation, automobile industry and the like, is especially suitable for thermal barrier coatings, high-temperature thermal insulation materials and other high-temperature thermal insulation applications, and has important engineering application value.

The invention provides a hydrogen interstitial doped strontium titanate material and a preparation method thereof, the hydrogen interstitial doped strontium titanate material is prepared by doping a hydrogen element into a strontium titanate single crystal through a solid-phase reaction, and the hydrogen element is introduced into a strontium titanate lattice interstitial site by using sodium borohydride as a hydrogen source. According to the hydrogen gap doped strontium titanate material disclosed by the invention, the carrier concentration is obviously increased, the absorption of the material in a range from visible light to infrared light is enhanced by doping, and the photon utilization rate is improved. Compared with heavy metal displacement doping and hydrogen ion gap doping, the carrier mobility is not damaged, environmental protection is easy, the cost is low, doping conditions are not harsh, and large-scale industrial production is easy.

The invention relates to the technical field of molecular sieve synthesis and solid waste recycling, and particularly discloses a method for preparing an ITH type molecular sieve from silica gel waste through a ball-milling solid-phase crystallization method. The method comprises the following steps: mixing waste silica gel as a main silicon source with an aluminum source, an alkali source, an organic template agent and deionized water, directly carrying out mechanochemical activation and solid-phase reaction through high-energy ball milling without conventional hydrothermal crystallization, and then carrying out solid-phase crystallization at a relatively low temperature to finally obtain the ITH type molecular sieve with good crystallinity. According to the method, a ball-milling solid-phase crystallization method is applied to synthesis of the ITH type molecular sieve for the first time, and full-amount and high-value utilization of the silica gel waste is successfully realized. The method has the remarkable advantages of short process flow, no need of a large amount of solvent, low energy consumption, low cost and environmental friendliness, and opens up a new path for industrial low-cost preparation of the ITH type molecular sieve and green recovery of silica gel waste.

The application discloses a preparation method and system of sodium difluorophosphate. The preparation method of sodium difluorophosphate comprises the following steps: S100, in a water-free or low-water environment, a solid-phase reaction is generated between diphosphorus pentoxide and ammonium fluoride to obtain an ammonium difluorophosphate intermediate, and volatile substances generated in the reaction process are removed and recovered; S200, in a water-free organic solvent, the ammonium difluorophosphate intermediate obtained in the step S100 is reacted with a sodium salt to obtain sodium difluorophosphate. The preparation method of sodium difluorophosphate provided by the application uses diphosphorus pentoxide and ammonium fluoride as reaction raw materials to obtain an ammonium difluorophosphate intermediate, and then reacts to obtain sodium difluorophosphate. The obtained sodium difluorophosphate has high purity and few impurities. The preparation method of sodium difluorophosphate has the advantages of cheap and easily obtained raw materials, stable chemical properties, few by-products generated in the reaction, and easy recovery, and is a green and safe preparation method of sodium difluorophosphate.

The present invention relates to a low-dielectric and low-loss magnesium silicate system microwave dielectric ceramic and a low-temperature preparation method thereof. The present invention uses Mg2SiO4 ceramic as a matrix and adopts Mg 2+ Mg was synthesized by the conventional solid phase reaction method using non-stoichiometric modification, CaTiO3 to adjust the temperature stability and LiF to reduce the sintering temperature. 2.1 SiO 4.1 ‑xCaTiO3‑yLiF multiphase composite microwave dielectric ceramics, wherein x=0.09~0.13,y=0.05~0.25. The multiphase composite makes the prepared Mg 2.1 SiO 4.1 ‑xCaTiO3‑yLiF has a low dielectric constant, low dielectric loss, and a near-zero resonant frequency temperature coefficient, and reduces the sintering temperature of ceramic samples. This invention could provide an alternative material for the preparation of high-frequency communication components using LTCC technology, and has broad application prospects.

The invention relates to a method in the technical field of inorganic materials, in particular to a method for preparing metal element doped hydroxyapatite through a high-temperature solid-phase method, a product prepared through the method and application of the product. Through two steps of high-temperature solid-phase reaction, metal-doped beta-tricalcium phosphate (beta-TCP) is synthesized in advance to serve as a reaction precursor, the metal-doped beta-tricalcium phosphate and calcium carbonate are subjected to solid-phase reaction at high temperature to generate metal-doped hydroxyapatite, the distribution uniformity of doped elements in a final hydroxyapatite product is guaranteed, and by controlling the temperature and time, the metal-doped hydroxyapatite is prepared. Generation of impure phases can be effectively inhibited, and doped hydroxyapatite with single phase composition is obtained. The method is simple in process, free of solvent and high in yield, metal ions with different functions can be flexibly introduced, directional regulation and control of functionality such as biological activity, mechanical property and antibacterial property of a final hydroxyapatite material are achieved, and a new way with great industrialization prospects is provided for large-scale and low-cost preparation of high-performance doped hydroxyapatite.

The invention relates to the technical field of catalytic reaction, and discloses a collision catalytic reactor and application thereof. The collision catalytic reactor can adjust the flow velocity of the reaction gas, and the mechanical energy of the reaction gas is utilized to drive the catalyst particles to cyclically collide with the target body. In the process, the size and the structure of catalyst particles are changed, dynamic adjustment of the surface of the catalyst is achieved, then the efficiency and the stability of the catalytic reaction are improved, and a large number of opportunities are created for discovery of new catalytic reactions. The collision catalytic reactor is simple in structure, stable in operation and suitable for gas-solid phase reaction. Compared with a traditional reaction mode in a fixed bed reactor, on the same aluminum oxide supported copper catalyst, the carbon dioxide hydrogenation rate is improved by more than three times, the methanol selectivity is improved by more than two times, and the stability is also remarkably improved.

The invention discloses a process for dealkalizing and deeply reducing red mud through gradient temperature control treatment, which comprises the following steps: 1) accurately metering raw materials and grinding; 2) feeding the ground raw materials into a red mud stirrer, and stirring at a gradient rotating speed; 3) feeding the stirred and mixed raw materials into a granulator for granulation, and pressing the materials into particle materials with the particle size of 5-15mm; 4) feeding the particle material into a dealkalization solid-phase reaction device, and forming a particle material after a solid-phase reaction in a reducing atmosphere; (5) feeding the particle material after the solid-phase reaction into a cooling machine, and slowly cooling in a furnace by adopting a nitrogen direct circulating cooling method; 6) crushing the cooled material by a crusher until the particle size is less than 5mm; 7) performing magnetic separation on the ground powder by a high-gradient magnetic separator.According to the method, efficient dealkalization and iron element reduction separation are realized through high-temperature dealkalization pre-reduction and high-temperature deep reduction melt separation.

The invention discloses a method and a device for full-automatic rapid granulation and dry pressing forming, and belongs to the technical field of powder pressing forming. Granulating the powder through electromagnetic vibration, and transferring the granulated powder to full-automatic dry-pressing molding equipment by using a mechanical arm for dry-pressing molding to obtain a green body with a designed shape; according to the invention, rapid full-automatic forming of multi-batch powder of small samples can be realized, technical support is provided for high-throughput all-solid-phase reaction experiment preparation, efficient and rapid design development or screening of materials is promoted, and meanwhile, a new way is provided for preparation of high-performance materials.

The application discloses a kind of low-grade lepidolite efficient clean lithium extraction methods, comprising the following steps: S1: lithium mica ore is mixed with sodium potassium sulfate, calcium sulfate, calcium hydroxide, lime, quartz uniformly, then mixed raw material is pressed into brick billet;S2, the brick billet is stacked, preheating drying, high-temperature calcination, cooling, crushing, powder after grinding to obtain fine powder clinker;S3: the fine powder clinker is immersed with water liquid, then through solid-liquid separation to obtain leaching solution;The application can accelerate the solid-phase reconstruction reaction of lepidolite by using sodium sulfate potassium salt, thereby improving the conversion rate of lithium;On the other hand, by adding quartz, the free energy of the solid-phase reaction between lepidolite and sulfate can be effectively reduced, so that low-grade lepidolite can also have a good transformation rate;Adding lime and calcium hydroxide is significantly better than adding calcium carbonate, not only can effectively absorb the HF gas generated in the reaction, but also can avoid the reduction of lithium leaching due to the combination of fluorine and lithium, which is beneficial to improve the leaching rate of lithium.