14results about How to "Reduce supersaturation" patented technology

The invention discloses a method for preparing a container aluminum foil with a high recycled aluminum content. The components of the aluminum foil are: Si: 0.2-0.60%, Fe: 1.20-1.60%, Cu: 0.01-0.05%, Mn: 0.4-0.8%, Mg: 0.01-0.05%, Zn: 0.01-0.05%, Ti: 0.015-0.035%, and the balance is Al; the process flow is: smelting-continuous casting and rolling-cold rolling-finished product annealing; the invention makes continuous casting and rolling The proportion of recycled aluminum waste used in the rolling process has increased from 10%-20% to 60%-80%. The energy consumption of the industrial chain has been reduced, pollutant emissions have been reduced, the amount of alloying agents added has been reduced, production costs have been reduced, and the green production effect has been more obvious. The process flow has been greatly shortened, energy consumption has been reduced, pollutant emissions have been reduced, and green production has been implemented. The thickness of the container foil produced is 0.125-0.16mm, the O-state tensile strength is 110-140Mpa, the elongation is ≥30%, and the cupping value is ≥9mm.

The invention relates to the field of chemical application, and discloses a device for preparing large-particle ammonium sulfate crystals through reduced-speed crystallization. Comprising a neutralization reactor, a settling separation tank, a pre-crystallization solution tank, a first-stage intermittent jacket crystallizer, a second-stage intermittent jacket crystallizer, a filter powder sieving device, an ammoximation tert-butyl alcohol tower reboiler, a heat exchanger group, a stirrer group and a centrifugal pump group, wherein the centrifugal pump group consists of a centrifugal pump I, a centrifugal pump II, a centrifugal pump III, a centrifugal pump IV and a centrifugal pump V; the invention further discloses a process for preparing the large-particle ammonium sulfate crystals through speed-reducing crystallization. The process comprises the following steps: adding rearrangement liquid from a caprolactam rearrangement system and gas ammonia into the neutralization reactor through an external circulation pipeline. By fully utilizing heat in a neutralization reaction and crystallization process and combining with a compound additive, a seed crystal and a speed reduction crystallization technology, an efficient two-stage series crystallization mode is realized, the generation of large-particle ammonium sulfate crystals is promoted, the crystal quality is optimized, the energy consumption is reduced and the production efficiency is improved.

The invention relates to the technical field of environmental engineering, in particular to a fluorine ion crystallization recovery method based on a PCR (polymerase chain reaction) pellet reactor, which comprises the following steps: (1) measuring and recording the concentration of fluorine ions in wastewater to be treated, and adding a calcium salt agent and a special seed crystal according to the concentration of the fluorine ions in the wastewater to be treated; (2) adding a calcium salt agent and a special seed crystal, uniformly stirring and mixing, and adjusting the pH value of the wastewater to 6.0-7.5; (3) controlling the reaction time to be 10-30 minutes; (4) recycling fluorine-containing pellet crystals after the wastewater treatment is completed; the invention provides a fluorine ion crystallization recovery method based on a PCR (polymerase chain reaction) pellet reactor, which comprises the following steps: adding a calcium-containing composite chemical agent and a seed crystal into fluorine-containing wastewater to induce fluorine element crystallization to form microcrystals, and crystallizing layer by layer to form a fluorite-like layer as time goes on so as to realize recovery and reutilization of fluorine resources.

The application provides a silicon carbide crystal growth method and a growth device thereof, and belongs to the technical field of silicon carbide single crystal growth. The growth method comprises the following steps: providing a crystal growth device, mounting a silicon carbide seed crystal on a seed crystal holder, and cyclically performing a preset number of redox pretreatments; the redox pretreatment comprises the following steps: using an oxidizing gas to perform oxidation treatment on a growth surface of the silicon carbide seed crystal to obtain an oxidation layer, and then using a reducing gas to perform reduction treatment on the oxidation layer and to desorb; after the cyclic execution, a pit is generated at a basal plane dislocation emergence of the seed crystal surface, and a pretreated seed crystal is obtained; an asymmetric structure is adopted to fill silicon carbide polycrystal materials at the bottom of a crucible in the crystal growth device; a physical vapor transport method is used for crystal growth, so that the growth rate of a central region of the crystal is greater than that of an edge region, and a finished product is obtained. The device for the above method is also provided. The problems that the existing BPD cannot be effectively removed, the existing process cost is high, and the yield is low are solved.

The invention discloses a method for producing high-purity ammonium metavanadate from vanadium-containing purified liquid. The method specifically comprises the following steps: adjusting the pH value of the vanadium-containing purified liquid to 5-6, and adding ammonium salt at normal temperature for vanadium precipitation to obtain a sodium ammonium vanadate solid; dissolving the sodium ammonium vanadate solid in pure water at 80-100 DEG C, adjusting the pH value to 8-10 by using ammonia gas, preserving heat and filtering to obtain a purified solution; and controlling the temperature of the purified solution, cooling, adding ammonium metavanadate seed crystals at 50-60 DEG C, and filtering at normal temperature to obtain large-particle high-purity ammonium metavanadate solids. The method is wide in raw material source, simple in process, low in cost and few in product impurity, and has good economic benefits and application prospects.

The invention provides a pharmaceutical preparation of a cefotaxime sodium compound and a preparation method thereof. The preparation method comprises the following steps: S1, weighing 20.0 g of sodium acetate trihydrate, putting the mixture into a reactor, adding 40.0 mL of a crystallization solvent, stirring and dissolving the mixture for 10 minutes, and obtaining a sodium acetate trihydrate solution; S2, adding cefotaxime acid to the sodium acetate trihydrate solution, and obtaining a clear and transparent reaction solution after the salt-forming reaction is complete; S3, moving the reaction solution into a crystallizer, dripping 0.5-2 mL of a 40% alkyl glycoside aqueous solution into the crystallizer, and starting stirring; S4, starting a constant temperature ice machine, and starting to drip a dissolving agent when the solution temperature in the crystallizer reaches 20-24° C., adding a seed crystal when the solution is slightly turbid, growing the crystal for 30 minutes, and continuing to drip a dissolving agent, and adding a total of 265 mL of a dissolving agent; S5, after the dissolving and crystallization is completed, vacuum filtration is performed, and drying is performed to obtain the cefotaxime sodium compound. The present invention reduces supersaturation, reduces nucleation barriers, and weakens spontaneous nucleation through the participation of 40% alkyl glycoside aqueous solution, so as to obtain a product with a large average particle size and concentrated particle size distribution.

The invention discloses a preparation method of a high-elongation cast-rolled 3003 aluminum alloy plate strip. The 3003 aluminum alloy plate strip with the thickness being 0.20-0.30 mm and the elongation being larger than or equal to 35% is obtained after alloy blending, cast-rolled blank production, cast-rolled blank high-temperature pre-annealing treatment, first recrystallization annealing, second recrystallization annealing and finished product annealing. According to the method, process improvement is carried out on the basis of a conventional cast-rolling method, a 3003 aluminum alloy plate strip finished product is produced through the method of shortening the length of a cast-rolling area, reducing the cast-rolling speed and increasing the thickness of a cast-rolling plate, high-temperature preheating annealing treatment is combined with cast-rolling blank, first recrystallization annealing treatment and second recrystallization annealing treatment are carried out on the first two passes of cold rolling, and the finished product is obtained. And finally, the 3003 aluminum alloy plate strip meeting the requirement for pipeline materials is obtained through cold rolling, the purposes of simplifying the production process, saving energy and reducing cost are achieved, the range of target products of existing cast rolling equipment is widened, and the production efficiency is improved.

The invention discloses a crystallization process of famoxadone, and belongs to the technical field of crystallization processes. The crystallization process comprises the following steps: dissolving a famoxadone crude product in a solvent, and filtering to obtain a solution A; cooling the solution A to 0 DEG C; dropwise adding a solventing-out agent for solventing-out crystallization; after the solventing-out agent is dropwise added, performing suction filtration, washing and drying to obtain famoxadone; wherein the solventing-out agent is a mixed solution of normal hexane and benzene. The benzene is added into the n-hexane solventing-out agent in the prior art, so that the polarity of the solvent can be adjusted in a proper volume ratio range, the caking rate is reduced, impurities crystallized and separated out in the solvent can be dissolved, and the purity of famoxadone is improved.

The application relates to the technical field of cement materials, and particularly discloses a high ore fused stone ferrite aluminate cement material and a preparation method thereof. The cement material is prepared by jointly grinding and treating high belite ferrite aluminate cement clinker and a modifier. The modifier is composed of succinyl phosphonate, a quaternary ammonium salt and an aluminum source. The molecular formula of the succinyl phosphonate is HOOC-CH2-CH2-CO(PO3H2). The modifier composed of succinyl phosphonate, a quaternary ammonium salt and an aluminum source is used to perform mechanochemical coupling modification on the belite ferrite aluminate cement clinker, multi-level interface interaction occurs under the induction of mechanical force, directional poisoning and growth inhibition of calcium aluminate crystal nuclei are realized, the early strength of the cement is maintained, and the volume stability of the cement material is significantly improved.

The invention discloses an electronic-grade hydrofluoric acid in-situ recycling device, and belongs to the field of wet electronic chemicals. The device comprises a reactor body, and a rotational flow liquid mixer and a circulating guide cylinder are arranged in the reactor body; a backflow cavity is formed in the lower end of the reactor body, a returned material screening device is arranged on the upper portion of the backflow cavity, a circulating pump is arranged on the outer side of the reactor body and located at the backflow cavity, a first connecting pipe and a second connecting pipe are connected to the circulating pump, the first connecting pipe is communicated with the backflow cavity, and the second connecting pipe is communicated with the rotational flow liquid mixer. Two materials are mixed in a diagonal rotational flow mode through the rotational flow liquid mixer, the problem of local supersaturation is avoided, the returned material screener is arranged at the bottom of the reactor body, crystals and fluid mixed liquid are distributed in an umbrella shape at an inlet of a circulating fluidization area due to the arrangement of a returned material cone, and the crystallization effect is improved. And meanwhile, pores formed in the screening plate can be used for carrying out particle screening on the seed crystals, so that the sizes of the seed crystals entering the circulating fluidization area are homogenized.

The invention provides a low-cost boron-containing 780MPa grade hot-dip galvanized dual-phase steel and a preparation method thereof. The chemical composition of the invention comprises, by mass percentage, C: 0.10% to 0.15%, Si: 0.10% to 0.40%, Mn: 1.45% to 1.85%, P≤0.015%, S≤0.010%, Als: 0.010% to 0.060%, N≤0.006%, Cr: 0.20% to 0.60%, Nb: 0.01% to 0.05%, Ti: 0.005% to 0.040%, B: 0.001% to 0.0045%, and the remaining elements are Fe and inevitable impurities. The present invention adopts the C-Si-Mn route of Ti+Nb+B composite microalloying, utilizes Ti to fix N element and gives full play to the role of B element in significantly improving hardenability, reduces the amount of alloy addition, and obtains a low-cost boron-containing 780MPa grade hot-dip galvanized duplex steel, which greatly reduces the cost and improves the market competitiveness.

The invention relates to the technical field of cement materials, and particularly discloses a high-ore-melting-stone iron aluminate cement material and a preparation method thereof. The cement material is prepared by grinding high belite sulfur iron aluminate cement clinker and a modifier together. The modifier is composed of succinyl phosphonate, quaternary ammonium salt and an aluminum source. The molecular formula of the succinyl phosphonate ester is HOOC-CH2-CH2-CO (PO3H2). According to the invention, a modifier composed of succinyl phosphonate, quaternary ammonium salt and an aluminum source is used for carrying out mechanochemical coupling modification on belite pyrite aluminate cement clinker, and multi-level interface interaction occurs under the induction of mechanical force, so that directional poisoning and growth inhibition of ettringite crystal nucleus are realized; and the volume stability of the cement material is remarkably improved while the early strength of the cement is maintained.

The present invention discloses a titanium dioxide waste acid concentration device and concentration process that is not easy to be blocked, including a heat exchanger, the liquid outlet end of the heat exchanger is connected to a flash chamber through a heat exchanger outlet circulation pipe, the upper side of the flash chamber is provided with an evaporation gas extraction port, the bottom is connected to the inlet of an axial flow pump through a central circulation pipe, and the central circulation pipe is provided with a concentrated acid liquid extraction port; the outlet of the axial flow pump is connected to a crystallizer through a pump outlet circulation pipe, the bottom of the crystallizer is provided with an elutriation leg, the crystallizer is provided with a liquid outlet and connected to a dilution mixing chamber through the liquid outlet, the dilution mixing chamber is connected to the liquid inlet end of the heat exchanger, and the dilution mixing chamber is provided with a dilute acid liquid inlet. The present invention has the advantages of not easy to block the equipment, simple treatment process, small increase in workload, low treatment cost, and high concentration of produced acid.

The application relates to the technical field of iron phosphate preparation, in particular to a preparation method of iron phosphate dihydrate containing an orthorhombic crystal form, which comprises the following steps: adding a mixed solution of a phosphate and an oxidizing agent into a ferrous solution, controlling the amount of the oxidizing agent, so that there is no ferrous ion in the reaction solution after the mixed solution is added; adding an alkali liquor to the reaction solution to adjust the pH value, and keeping the temperature at 50-60 DEG C for 1-2 hours; filtering and washing the prepared slurry to obtain a solid; after the solid is pulped, adding phosphoric acid to adjust the pH value, and reacting at 80-100 DEG C for 1-2 hours; and filtering, washing and drying the reaction product to obtain the iron phosphate dihydrate containing the orthorhombic crystal form. The preparation method of the iron phosphate dihydrate containing the orthorhombic crystal form is simple in process, short in technological process, low in reaction temperature, and does not need to add a surfactant in the reaction, so that the iron phosphate dihydrate containing the orthorhombic crystal form can be prepared.