21 results about "Thermal crystallization" patented technology

The invention provides a process for recovering sodium sulfate, sodium carbonate and glaserite in alkali ash and removing chloride ions. The process specifically comprises the following steps: dissolving the alkali ash; sodium sulfate and sodium carbonate in the alkali ash solution are separated through hot crystallization; cooling, crystallizing and separating glaserite in the alkali ash solution; sulfate ions and carbonate ions in the alkali ash solution are separated from chloride ions; and further separating sodium sulfate, sodium carbonate, glauberite and the like in the alkali ash solution. Meanwhile, the invention provides a system for implementing the process. The system comprises an alkali ash dissolving unit, a main crystallization unit, a glaserite crystallization unit, a nanofiltration unit and other elements. According to the process and the system provided by the invention, on one hand, sodium sulfate and sodium carbonate in the alkali ash solution can be extracted, glaserite can be extracted at the same time, chloride ions in the solution are removed at the same time, and the discharge amount of mother liquor is reduced.

The application provides a continuous crystallization mother liquor concentration regulation and impurity removal device and method, and belongs to the technical field of continuous crystallization equipment. A suction circulating pipe is designed outside the crystallization tank to ensure that the mother liquor fully flows in the whole continuous crystallization system, the concentration of the crystallization mother liquor is homogenized, and local supersaturation and thermal crystallization are avoided. A first inner pipe is arranged above the working liquid level in the crystallization tank to draw out the upper impurities and the accumulated light component mother liquor of the crystallization tank. In combination with the design of the open mother liquor and the impurity separation device, not only can the crystallization rate be reduced due to the too low local concentration, but also the impurities enriched at the top of the crystallization tank can be discharged, so that the influence of the impurities on the crystal quality is greatly reduced. In combination with the mother liquor parameter monitoring device arranged on the outer circulating pipe, the parameters of the crystallization mother liquor can be monitored in real time, the mother liquor extraction and circulation amount are more controllable, the crystallization environment stability is improved, and the efficient and stable generation of large particle crystals is facilitated.

The invention discloses a preparation method of high-purity ammonium rhenate, which comprises the following steps: adding rhenium-rich slag and water into a high-pressure kettle, uniformly stirring, adding hydrogen peroxide, heating, pressurizing and leaching, precisely filtering after leaching, and standing to obtain a leaching solution; the leachate is treated through a four-stage anion exchange column, the saturated ion exchange column is resolved through high-quality ammonia water, and resolved liquid is purified and enriched ammonium rhenate liquid; and performing high-temperature thermal crystallization on the purified and enriched ammonium rhenate solution under the action of micro-pressure ultrasonic waves, performing centrifugal separation to obtain high-purity ammonium rhenate crystals, and performing high-temperature drying to obtain a high-purity ammonium rhenate product. The method is simple in process, and the prepared product is high in activity, high in crystallization rate and excellent in purity and has high application value.

The invention discloses a superconducting tape film preparation method, which comprises the following steps: when a superconducting tape is subjected to film preparation through a pulsed laser deposition (PLD) or metal organic chemical vapor deposition (MOCVD) process, multiple thermal crystallization-quenching process steps are carried out, that is, the superconducting tape sequentially passes through a thermal crystallization region and a quenching region for multiple times, each time the superconducting tape is heated in the thermal crystallization area to complete directional crystallization, and then the superconducting tape enters the quenching area to be rapidly cooled. The multi-time'thermal crystallization-quenching 'process step is realized by a multi-stage'thermal crystallization-quenching' functional unit, and in the multi-stage'thermal crystallization-quenching 'functional unit, a plurality of thermal crystallization areas and quenching areas are sequentially and crossly arranged to form a plurality of stages of temperature control. According to the method, the problem of warping of the thick film of the superconducting tape is solved through stress release.

This application provides a ferroelectric thin-film capacitor and its fabrication method, a ferroelectric memory, and an electronic device. Each ferroelectric thin-film capacitor in the ferroelectric memory includes two electrode layers and a ferroelectric layer, with the ferroelectric layer located between the two electrode layers. The ferroelectric layer comprises hafnium dioxide material and includes at least one first doped region, in which a first doping element is doped. The atomic radius of the first doping element is smaller than the atomic radius of the hafnium element in the ferroelectric layer. The ferroelectric memory of this application can achieve higher crystallization quality under low-temperature rapid thermal crystallization conditions, thereby reducing operating voltage and power consumption, and improving storage reliability.

The present invention discloses a new process for preparing whiskers and recovering magnesium salts by using white mud, which includes: after separating white mud by sulfuric acid leaching, obtaining high-whiteness gypsum and magnesium sulfate solution containing calcium ions, then subjecting the magnesium sulfate solution containing calcium ions to decalcification treatment with carbonate to obtain high-purity magnesium sulfate solution; preparing high-purity magnesium sulfate monohydrate from the magnesium sulfate solution by a thermal crystallization method, preparing magnesium carbonate or magnesium bicarbonate by a carbonization process, and preparing high-purity magnesium oxide after calcination; preparing high-whiteness nanoscale calcium sulfate fibers and high-strength gypsum products from the high-whiteness gypsum by a hydrothermal method. The present invention not only turns waste into treasure, but also realizes the resource utilization, clean utilization and high-value utilization of white mud in the rare earth production industry.

The present invention relates to the field of fine chemicals, and specifically relates to a preparation method of sodium bis(oxalato)borate; the present invention uses a sodium source, boric acid, and oxalic acid as raw materials, and synthesizes sodium bis(oxalato)borate by a solid-phase method, and uses a method combining antisolvent crystallization and thermal crystallization to purify sodium bis(oxalato)borate. The present invention has the advantages of high yield and rapid purification process; the present invention uses a solid-phase synthesis method combined with a purification method, which can greatly shorten the synthesis and purification time; the sodium bis(oxalato)borate prepared by the present invention has high purity, high yield, and high conductivity, and can be used as an electrolyte for batteries; the electrolyte prepared from the sodium bis(oxalato)borate prepared by the present invention has better cycling performance at low rates than commercial electrolytes.

Nitrogen-doped CZ silicon crystal ingots and wafers sliced therefrom are disclosed that provide for post epitaxial thermally treated wafers having oxygen precipitate density and size that are substantially uniformly distributed radially and exhibit the lack of a significant edge effect. Methods for producing such CZ silicon crystal ingots are also provided by controlling the pull rate from molten silicon, the temperature gradient and the nitrogen concentration. Methods for simulating the radial bulk micro defect size distribution, radial bulk micro defect density distribution and oxygen precipitation density distribution of post epitaxial thermally treated wafers sliced from nitrogen-doped CZ silicon crystals are also provided.

This invention relates to the field of semiconductor manufacturing, and in particular to a method, apparatus, and heat-treated wafer thermal oxidation method. The method involves rotating the wafer to be processed; feeding the rotated wafer into a tripod boat; and aligning the line connecting the center of the wafer to be processed with the top leg of the tripod boat with the center of the wafer to be processed. <110> The included angle between crystal orientations is within a first preset range; the wafer to be processed in the tripod crystal boat is subjected to thermal oxidation treatment. This invention targets the tripod crystal boat by changing a specific crystal orientation on the wafer to be processed (i.e., <110> The angle between the crystal orientation and the line connecting the top foot to the wafer center, and the inner edge of the wafer. <110> The shear stress of the crystal orientation is greatly reduced, which weakens the deformation caused by stress, thereby reducing the surface defects generated in the wafers during the thermal oxidation stage, improving the yield of thermal oxidation, reducing the rework rate, and improving production efficiency.

The invention relates to the technical field of basic cupric carbonate drying devices, in particular to a basic cupric carbonate low-temperature thermal crystallization material drying integrated device. Comprising a base frame and further comprises a conveying shaft barrel rotationally installed on the base frame, a centrifugal conical disc is fixedly installed on the upper portion of the conveying shaft barrel, spraying outer holes are formed in the position, corresponding to the lower portion of the centrifugal conical disc, of the peripheral face of the conveying shaft barrel in an array mode, circulating discharging ports are formed in the upper portion of the conveying shaft barrel in an array mode, and circulating returning ports are formed in the lower portion of the conveying shaft barrel in an array mode; a first shock excitation unit for driving the material vibrating frame to periodically vibrate in a variable amplitude mode is arranged between the material vibrating frame and the material vibrating frame, a spraying shaft pipe is rotationally installed on the material vibrating frame, and spraying inner holes are formed in the periphery of the spraying shaft pipe in an array mode. The device has the beneficial effects that through the centrifugal material throwing structure of the centrifugal conical disc, the hot air gradient drying system with the inner and outer double jet holes and the reverse rotation cooperation of the spiral conveying blade and the conveying shaft barrel, the initial state that materials are fed, namely caking is broken through.

The application discloses a preparation method of a photo-thermal carbon dioxide hydrogenation methane catalyst. The catalyst is prepared through processes of solvent-thermal crystallization for preparing a precursor, calcination for preparing carbon-coated titanium dioxide, and immersion reduction for preparing a product. The photo-thermal performance of metal oxide is improved by using the metal oxide and carbon-based material, and the material has good photo-thermal catalytic performance. The material is black as a whole due to the carbon material coated on the surface, has a relatively narrow band gap or rich surface defects, has a relatively wide spectral absorption rate and good photo-generated carrier separation efficiency, and finally has excellent photo-thermal catalytic performance.

The invention discloses a method for preparing high-purity ammonium molybdate by using a waste cobalt-molybdenum catalyst, which comprises the following steps: carrying out ball-milling treatment on the waste cobalt-molybdenum catalyst, putting the waste cobalt-molybdenum catalyst into a beaker, carrying out magnetization in magnetization equipment under a stirring condition, adding sodium carbonate into the magnetized material for alkaline leaching, and carrying out liquid-solid separation on the mixed solution to obtain an alkaline leaching solution; adjusting the pH value of the alkaline leaching solution with dilute sulfuric acid, purifying and precipitating molybdenum, carrying out liquid-solid separation to obtain molybdic acid, dissolving and clarifying the molybdic acid with stronger ammonia water, adjusting the pH value of the dissolved and clarified ammonium molybdate solution with dilute acid, and purifying and precipitating molybdenum again to obtain pure molybdic acid; pure molybdic acid is dissolved and clarified with strong ammonia water, the dissolved and clarified ammonium molybdate solution is subjected to evaporation, concentration and high-temperature thermal crystallization under the micro-pressure ultrasonic action, and the crystallized mixed solution is subjected to centrifugal separation to obtain a 4N-grade or above high-purity ammonium molybdate product. The method for preparing high-purity ammonium molybdate by using the waste cobalt-molybdenum catalyst has the characteristics of good product quality, simple process and high molybdenum recovery efficiency.

The invention provides a continuous crystallization mother liquor concentration regulation and control impurity removal device and method, and belongs to the technical field of continuous crystallization equipment, a suction circulating pipe is designed outside a crystallization tank to ensure that mother liquor fully flows in the whole continuous crystallization system, so that the crystallization mother liquor concentration is homogenized, and the thermal crystallization phenomenon caused by local supersaturation is avoided; upper-layer impurities and overstocked light-component mother liquor in the crystallizing tank are pumped out through the first inner insertion pipe arranged above the working liquid level in the crystallizing tank, and the design of a mother liquor open circuit and impurity separation equipment is combined, so that the phenomenon that the crystallization rate is reduced due to too low local concentration can be avoided, the impurities enriched at the top of the crystallizing tank can be discharged, and the crystallization efficiency is improved. Therefore, the influence of impurities on the crystal quality is greatly reduced; and the mother liquor parameter monitoring equipment arranged on the outer circulating pipe is combined, so that the parameters of the crystallization mother liquor can be monitored in real time, the extraction and circulation amount of the mother liquor are more controllable, the stability of the crystallization environment is improved, and high-efficiency and stable generation of large-particle crystals is facilitated.

The invention provides a heat treatment method for a semiconductor workpiece. The heat treatment method comprises the steps that the semiconductor workpiece is placed on a movable carrying unit; the carrying unit is driven to move in the heat treatment cavity in the advancing direction and sequentially pass through a heating area, a constant-temperature area and a cooling area of the heat treatment cavity to complete heat treatment of the semiconductor workpiece, the heating area, the constant-temperature area and the cooling area each comprise a plurality of sub-temperature areas, the temperature of each sub-temperature area of the heating area is gradually increased in the advancing direction, and the temperature of each sub-temperature area of the cooling area is gradually decreased in the advancing direction. The temperature of each sub-temperature area of the constant-temperature area is constant, and the temperature of each sub-temperature area of the cooling area is gradually decreased in the advancing direction. According to the invention, the temperature curve is converted into the temperature zones in stepped distribution according to a'space 'expansion mode, the crystal bars sequentially pass through the temperature zones of the heat treatment chamber to finish heat treatment, heat treatment can be simultaneously carried out on multiple groups of crystal bars in the same period, the crystal bars are uniformly heated, the production efficiency is improved, different process requirements are met, and the performance of the device is improved.

The invention discloses silver-palladium alloy-barium titanate core-shell structure nano-powder which comprises silver-palladium alloy nano-particles serving as a core layer and a crystalline state barium titanate coating layer serving as a shell layer, the particle size of the core layer is 300-800 nm, the expression is AgxPd1-x, x is larger than or equal to 0.4 and smaller than or equal to 0.9, and the thickness of the shell layer is 10-100 nm; the preparation method sequentially comprises the steps of silver-palladium alloy nano powder surface pretreatment, barium titanate precursor solution preparation, gradient heating hydrolysis coating, low-temperature solvothermal crystallization, product post-treatment and reaction liquid centrifugal separation. Alloy powder is dispersed through a non-aqueous solvent, and interface non-diffusion coating is achieved through chelating agent assisted gradient heating hydrolysis in combination with a low-temperature high-pressure hydrothermal reaction; the obtained powder is good in crystallinity and uniform in coating at low temperature; according to the invention, the technical barrier of low-temperature high-quality synthesis of the metal-ceramic core-shell material is overcome, and core material support is provided for miniaturized high-reliability electronic devices.

This invention belongs to the technical field of solid electrolytes and discloses a method for preparing a liquid-phase doped silver-germanium sulfide solid electrolyte with high ionic conductivity. The method includes: 1) dispersing lithium sulfide and phosphorus pentasulfide in an organic solvent, heating and stirring to obtain a precursor solution containing Li3PS4; 2) mixing lithium iodide, sulfur powder, and additives with the precursor solution, heating and stirring to remove the organic solvent, and obtaining a powder; 3) sintering the powder under a protective atmosphere to obtain a silver-germanium sulfide solid electrolyte; the additives are one or more of SiS2, GeS2, SnS2, As2S3, and Sb2S3. This invention is simple, and the prepared silver-germanium sulfide electrolyte undergoes elemental doping during thermal crystallization, improving the electrolyte's ionic conductivity and air stability. This method is suitable for industrial production.

The application belongs to the technical field of adsorbents, and particularly relates to a zirconium phosphate-based composite material, a preparation method and application thereof. The application provides a preparation method of a zirconium phosphate-based composite material, which comprises the following steps: mixing a soluble zirconium source, a hydrated phosphate and a mineralizer, and obtaining the zirconium phosphate-based composite material through thermal crystallization; and the number of crystal water in the hydrated phosphate is greater than or equal to 2. In the application, the hydrated phosphate containing more than 2 crystal waters is used as a raw material, the obtained composite material has high removal efficiency for ammonium in a water system or a cell culture medium; and the obtained composite material has good biocompatibility, has a slight influence on the pH of a system, and can be used repeatedly.

The invention relates to a waste salt resourceful treatment process, which is characterized in that the content of divalent sulfate radicals is reduced by freezing; the frozen mixed waste brine is efficiently separated into two material flows, namely light-side produced water mainly containing sodium chloride and potassium chloride and concentrated-side concentrated water mainly containing sodium sulfate, sodium chloride and potassium chloride; then, the two material flows are independently fed into a subsequent deep purification process and an evaporative crystallization system in a coupling manner respectively, and finally high-purity sodium chloride, potassium chloride and sodium sulfate products are produced. According to the method, the potassium salt and the sodium salt are separated through freezing denitration, nanofiltration pre-separation and evaporation thermal crystallization, the problem that the mixed salt is difficult to separate is fundamentally solved, the technological process is simple, the product purity is high, and efficient and high-valued resource recovery of the waste salt is achieved.

This invention belongs to the field of lithium iron phosphate recycling technology and relates to a method for regenerating waste lithium-ion battery cathode materials. The method includes: mixing and stirring pretreated cathode powder after roasting with a phytic acid-hydrogen peroxide system; filtering and separating the mixture to obtain solid residue and a lithium-containing leachate; mixing the solid residue with phosphoric acid, heating and reacting, and calcining to obtain battery-grade iron phosphate; and subjecting the lithium-containing leachate to secondary precipitation and thermal crystallization to obtain battery-grade lithium carbonate. This invention uses a phytic acid-hydrogen peroxide system to treat waste lithium iron phosphate battery cathode materials, efficiently recovering valuable metal elements and obtaining battery-grade iron phosphate and battery-grade lithium carbonate.

The invention discloses a vacuum axial flow photo-thermal saline water crystallization system and a using method thereof.The system comprises a photo-thermal crystallization system installed on a support body, and the photo-thermal crystallization system comprises a light reflecting plate and a vacuum pipe; the reflector is fixedly mounted below the vacuum tube through a reflector bracket, light focused by the reflector can irradiate the vacuum tube for heating, and the vacuum tube is provided with an inner cavity for accommodating strong brine, and a salt discharge port, a steam discharge port and a water inlet which are communicated with the inner cavity; sequentially carrying out preheating, illumination radiation, vacuum heat collection and axial flow separation, and carrying out water vapor evaporation and salt crystallization; the steam is condensed into distilled water in the heat exchanger, so that water in the saline water is recycled; the crystallized salt is conveyed into a salt collector to be collected, so that the crystallized salt is recycled; illumination radiation resources are mainly used in the process of the whole system, and zero-energy-consumption and high-efficiency brine evaporation and crystallization are achieved.

The invention discloses a high glowing filament flame-retardant modified PA material and a preparation method thereof. The high glowing filament flame-retardant modified PA material comprises PA resin, a halogen-free flame retardant, a flame-retardant synergist, a glowing filament synergist compound, magnesium hydroxide, a coupling agent, a flexibilizer, an antioxidant, a lubricant and a nucleating agent. By adding the MCA flame retardant, the flame retardant synergist and the treated glowing filament synergist compound, the flame retardant grade UL94 V0 of the material can be met, the glowing filament ignition temperature and glowing filament stability of the material are improved, and the latest environmental protection requirement is met; by adding the polyester nucleating agent, the thermal crystallization temperature is effectively increased in the melt cooling crystallization process, the crystallization speed is increased, and the film sticking problem is solved; the obtained product has the advantages of high mechanical property, good fireproof performance, excellent processability, good dimensional stability and good product surface glossiness, can meet the requirement of a 750 DEG C glowing filament for no ignition in the whole process, and meets the market demand of a PA modified material.