13 results about "Thermal crystallization" patented technology

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.

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 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.

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.