34results about How to "Rapid crystallization" patented technology

The invention provides a preparation method of a europium oxide (EUO) type molecular sieve. The preparation process comprises the steps: adding one or more of ethanol, propylene glycol, methyl alcohol and acetone with a proper amount to be taken as an organic solvent; filling a high-pressure inert gas into a high-pressure kettle, and carrying out sectional type crystallization under a certain condition; filtering and washing the product to be neutral; and drying, roasting to obtain the EUO molecular sieve. The organic solvent is added, so that a template agent precursor is promoted to be dissolved in an aqueous phase, and the generation of a template agent is accelerated; and therefore, the crystallization speed of the molecular sieve is accelerated, and the crystallization time of the molecular sieve is remarkably shortened.

The invention relates to a synthetic method of an MWW structured Si / B molecular sieve and mainly solves problems of severe toxicity of a template or complex preparation in the prior art. The synthetic method provided by the invention comprises the following steps: mixing a boron source, a silicon source, alkaline MOH, a template R and water, wherein the mol ratio of the mixture is B2O3:SiO2:OH-:R:H2O=(0.01-1.00):1:(0.02-0.30):(0.01-0.50):(5-50); carrying out hydrothermal crystallization on the above mixture at the temperature of 100-200 DEG C for 1-10 days; separating, washing and drying to obtain the MWW structured Si / B molecular sieve, wherein the template R is diethyldimethylammonium hydroxide. The technical scheme can be applied in industrial production of the MWW structured Si / B molecular sieve.

The invention discloses a method for preparing a zeolite molecular sieve through quick crystallization of dry glue, and relates to the field of molecular sieve solid phase synthesis. The method specifically comprises the following steps: adding an aluminum source and a fluoride into a silicon-aluminum type molecular sieve mother solution for crystallizing to obtain a silicon-aluminum type molecular sieve guiding agent; adding an alkali source, a silicon source, a template agent R and deionized water into the silicon-aluminum type molecular sieve guiding agent, uniformly carrying out mixing, and then carrying out drying to obtain dry glue powder; and crystallizing the dry glue powder in a steam atmosphere in a continuous crystallization kettle to obtain the zeolite molecular sieve, whereinthe crystallization time is 2-10 hours. The guiding agent disclosed by the invention is obtained by secondary crystallization, and is high in activity and strong in guiding action, so that the usage amount of the template agent can be reduced, crystallinity can be improved, generation of hybrid crystal phases formed by solid-phase synthesis is avoided, and the crystallization period is shortened.The continuous crystallization kettle can be used for continuous production without need of cooling and pressure relief, so that the required crystallization time is short, and efficiency and yield are high. The prepared zeolite molecular sieve is good in stability, high in crystallinity and high in silicon-aluminum ratio.

The present invention is to provide a method for separating and extracting battery-grade lithium carbonate and rubidium and cesium salts from lepidolite, using lepidolite as a raw material and adopting an acidizing roasting method, which includes crushing, feeding and pulping, acidizing leaching, mixing, drying , acidizing roasting, water immersion reaction, two cooling crystallization, adding alkali to neutralize and separate gypsum solid slag, adding impurity remover to remove impurities, evaporating concentration and preparing crude lithium carbonate and rubidium, cesium vanadium salts, etc., greatly reducing the comprehensive extraction of lepidolite The method of preparing battery-grade lithium carbonate and rubidium and cesium salts with high equipment utilization rate, low environmental protection three waste discharge and low production cost.

The invention discloses master batches for production of polyester filaments, and a preparation method and application thereof. The problems that the traditional regenerated master batches cannot havethe characteristics of properties close to those of the original master batches and low cost are solved. According to the key point of the technical scheme, the master batches comprise the followingcomponents in parts by weight: 60 to 70 parts of waste plastic bottle sections, 10 to 40 parts of original master batches, 1 to 3 parts of defoaming master batches, 1 to 5 parts of compatibilizer and0.1 to 1 part of accelerant. The master batches prepared by the above formula have low cost, have excellent properties close to those of the original master batches, can be compatible with the waste plastic bottle sections well in the production of the polyester filaments and enables the polyester filaments to be uniform in character and color.

A method for recovering nickel sulfate from copper smelting high-impurity and high-nickel anode copper plate, the method is cast into high-impurity high-nickel anode copper plate after refining copper smelting high-impurity high-nickel anode copper plate, electrolyzing high-impurity high-nickel anode copper plate, recycling Filtration of the electrolyte, purification and removal of impurities on the electrolyte, deep recovery of nickel sulfate, cleaning of the nickel sulfate crystallization tank, and treatment of nickel anode slime, etc., have realized the recovery of nickel sulfate from high-impurity and high-nickel anode copper plates in copper smelting with high efficiency. The process The operation is simple, the environment of the operation site is clean and hygienic, the electrolytic refining system has a strong adaptability to high-impurity raw materials, the waste electrolyte has a large de-impurity treatment capacity, and the quality of the cathode copper product and the electrolysis efficiency are taken into account.

The invention relates to a method for synthesizing a monodisperse samarium-doped rare earth cerium oxide nanocrystal, belonging to the functional material preparation technical field. The method comprises the following steps: firstly, preparing an aqueous phase solution by using soluble cerium nitrate and samarium nitrate as raw materials and carbamide as a precipitant; forming an inverse microemulsion by using cetyl-trimethyl ammonium bromide as a surfactant, normal butyl alcohol as a cosurfactant and normal octane as an oil phase and adding the aqueous phase solution; filling the inverse microemulsion into a high-pressure reaction kettle the inner lining of which is made of polytetrafluoroethylene, heating for reaction, removing the normal octane from the reaction product by centrifugalseparation, and removing the cetyl-trimethyl ammonium bromide and the normal butyl alcohol by washing to obtain a precursor product; and carrying out light irradiation on the precursor product to obtain the shape-controllable crystallized synthesized monodisperse samarium-doped rare earth cerium oxide nanocrystal which is uniform in particle size.

The invention relates to a preparation technology for water-soluble resveratrol particles. The preparation technology is that: (1) resveratrol transparent solution is prepared; (2) the prepared resveratrol transparent solution is pumped to the crystallizing kettle of a supercritical fluid crystallizing device; (3) residual chemical solution in a pipeline is flushed after chemical solution is fed; and (4) a pump is shut down, pressure and temperature are regulated to the natural state and the obtained particles are water-soluble resveratrol particles. The diameter of the water-soluble resveratrol particles is 50nm-200nm. X-ray diffraction shows that the particles are in the indefinite state. The water-soluble resveratrol particles can be used in medicines, healthcare foods, feeds, food additives, cosmetics and the chemical field. The invention has the advantages that the nature of indissoluble resveratrol is changed, the water solubility of the resveratrol is obviously improved and the dissolution speed in water is very fast; and since the resveratrol is rapidly precipitated in the supercritical fluid, the finished product is enabled to be loose and the dissolution speed in water is very fast.

The invention relates to a preparation method of spinel lithium manganate. The preparation method comprises the following steps: uniformly mixing lithium or manganese acetate or nitrate, then heatingunder the temperature of 102-108 DEG C, and treating for 5-30 minutes in a microwave oven under microwave power of 360-900W and microwave power density of 90-250W / m<2> to obtain spinel lithium manganate. Through application of the inside heating characteristic of microwave heating, the whole system reaches the ignition temperature simultaneously; the system rapidly carries out spontaneous combustion to release high heat; lithium manganate can be rapidly crystallized and shaped by means of the heat released by the combustion reaction; through microwave heating, the reaction time is greatly reduced, and a large amount of energy consumption is reduced; meanwhile, the method is simple in process and low in cost, is suitable for popularization, and can achieve efficient industrial mass production of lithium manganate.