45 results about "Aluminium hydroxide gel" patented technology

The invention discloses a preparation method for aluminum oxide by a direct forming method. The method is characterized in that the aluminum oxide is directly formed by a wet filter cake, wherein pore volume is 0.3-0.8ml/g; a specific surface area is 150-300 m<2>/g; and crushing strength is 30-120 N/particle; the preparation process comprises the steps: a) meta-aluminate containing aluminum or a strong acid salt compound is neutralized with a precipitator solution at a temperature of 30-80 DEG C and pH of 6-9; accessory ingredient is added in a neutralizing process; mixture is aged for at least 10min after neutralizing; b) prepared aluminium hydroxide gel is washed by de-ionized water for 4-10 times; dosage of the de-ionized water for each time is 10-40 times of mass of a dried substrate of prepared aluminium hydroxide; a hydrated alumina filter cake is obtained after washing and filtering; content of the aluminium hydroxide in the filter cake is controlled to be 5-50%; and c) the accessory ingredient is added into one or various liquid in the step a) and step b); the filter cake after washing is formed by a normal forming method; and the formed filter cake is dried at a temperature of 80-120 DEG C and calcined at a temperature of 450-1000 DEG C to obtain a finished product of the aluminum oxide.

The invention discloses macroporous aluminium oxide carrier and a preparation method thereof. The aluminium oxide carrier uses aluminium hydroxide gel prepared by molten salt super-solubility micelle method as raw material; the preparation method comprises the following steps: shaping, drying, roasting, and dipping precursor solution containing modifying agent to obtain the macroporous aluminium oxide carrier containing modifying agent. During the preparation process of the carrier, as aluminium hydroxide gel contains surfactant and hydrocarbon component, nanometer aluminium oxide particles still have stick-shaped basic structure, wherein after shaping and roasting, aluminium hydroxide is dewatered through polymerization so as to form nanometer aluminium oxide particles; and nanometer aluminium oxide particles are stacked randomly to form a frame structure, and modifying agent is used to block most of small pores, thus reducing the active metal amount of the dipped carrier and achieving the aim of reducing the production cost of catalyst. The obtained aluminium oxide carrier has large pore volume and bore size, high porosity, larger outer pore mouth and good pore passage penetrability, thus the deposition of impurities can be increased and the operating period of catalyst can be prolonged.

The invention discloses a preparation method of a hydrotreating catalyst, comprising the following steps of: introducing silicon and boron additives in the way that an organic silicon source is added after aluminium hydroxide gel forming and then a boron-containing organic compound solution is added, so as to obtain silicon and boron containing aluminium hydroxide, mixing an active metal component with silicon and boron containing aluminium hydroxide by a kneading method, and carrying out three-stage roasting to obtain the hydrotreating catalyst. The method provided by the invention is beneficial to uniform distribution of the silicon and boron additives and the active metal component in the catalyst and enhances the positive effect of the boron additive on active phase transition. In addition, the obtained catalyst has advantages of large pore volume, large specific surface area and appropriate pore structure and acidity. The preparation method is used to raise activity and stability of the catalyst and is especially suitable for hydro-denitrification of heavier hydrocarbons.

The invention discloses a preparation process for extracting human fibrinogens from waste for extracting cryoprecipitated blood coagulation factor VIII. The preparation process is characterized by comprising the steps of cryoprecipitation dissolution, 2% aluminium hydroxide gel absorption, ion strength adjustment, series connection filtering, S/D viral inactivation, ion-exchange chromatography, EDTA Ca2+ removal, glycine precipitation, primary low-temperature ethanol precipitation, AT-III thrombin inhibition, secondary low-temperature ethanol precipitation, nanofilm filtering and dry-heat inactivation. For ensuring the safety, a nanofilm ia added to filter virus except S/D and dry-heat inactivation. By means of an added AT-III inactivated thrombin and EDTA Ca2+ removal process, fibrinogen in the production process is effectively prevented from being activated into fibrous protein. The glycine precipitation is utilized to remove fibrous protein monomers and polymers in products so as obtain high-purity human fibrinogen. The preparation products are safe and reliable, redissolution time is short, the clinic first-aid demand is met, and meanwhile the preparation process has important significance on indirect saving of scarce plasma resources.

The invention relates to a multi-element composite flocculant for treating printing and dying wastewater and textile wastewater and a preparing method of the multi-element composite flocculant. The flocculant comprises polymeric aluminium, titanium polysilicic acid aluminium silicate, calcium aluminate powder, aluminium hydroxide gel, konjac glucomannan phosphate, chitosan, sodium silicate and an additive, wherein the deacetylation degree of the chitosan is larger than or equal to 95%. Through appropriate selection of components and proportion, the multi-element composite flocculant has the advantages of being high in flocculation efficiency, small in dosage, wide in temperature application range and pH application range and the like. The multi-element composite flocculant can be used for treatment and purification of the printing and dying wastewater and the textile wastewater and has wide industrialized application prospects and market values.

The invention discloses a method for preparing a coagulant and an application thereof. The method comprises the following steps: by taking industrial aluminium hydroxide as a main raw material, reacting with a sodium hydroxide solution under high temperature, cooling to room temperature, adding a hydrochloric acid solution into the reaction solution, controlling the basicity of the reaction solution to 2.4-2.7, and rapidly stirring to obtain an aluminium trichloride mixed solution with high basicity containing an active aluminium hydroxide gel; and heating and aging to obtain the coagulant after uniformly mixing the aluminium trichloride mixed solution with high basicity containing the active aluminium hydroxide gel. The invention also discloses an application of the coagulant prepared by the method for removing heavy metals in the water body. The preparation method provided by the invention is simple in process, low in energy consumption and small in device corrosion; and the obtained coagulant is good in stability without changing within 6 months, convenient to use and has a good removing effect on the heavy metals and the COD in the water body.

The invention discloses a human coagulation factor VIII preparation method. In the preparation process of a human coagulation factor VIII, a two-step filter press technique is adopted during treatment of human plasma initial materials, that is, a K700 filter plate is adopted for filter pressing after cryoprecipitate dissolution, the filter press liquor is collected, the pH value is adjusted, a 2% aluminium hydroxide gel is added for adsorption, and then an EK filter plate is adopted for filter pressing. The two-step filter press technique is adopted to improve the separation effect, meanwhile, the aluminium hydroxide gel adsorption method is used together to remove a coagulation factor on which vitamin K depends, the aluminium hydroxide gel does not adsorb the human coagulation factor VIII, and the product yield is high. In the preparation process, the two-step filter press technique replaces a traditional two-step high-speed centrifuging method, a CUNO DELP deep filter element is adopted for filtration, a two-step gradient dialysis method is adopted, a re-dissolution and re-freezing process is added to a freeze-drying process, and meanwhile, various virus removal/inactivation technologies are adopted in the production process, so that the product yield can be improved, the risk of virus spreading can be reduced, and the clinical medication security is improved.

The invention discloses a method for synthesizing nanometer gama-Al2O3 by adopting a solvent replacement/azeotropic distillation drying method. The method is characterized in that the concentration of a AlCl3 solution is 0.7mol.L<-1>, the molar concentration ratio of Al<3+> to a dispersing agent is 250:1, adding a solvent is added and then agitating is carried out, the furnace temperature is 580DEG C, low-cost AlCl3 and n-butyl alcohol replace expensive alcohol aluminum as raw materials, the hydrolysis rate of Al<3+> and the particle size are controlled through adding a surfactant, the hard agglomerate of a precursor aluminium hydroxide gel can be effectively eliminated by adopting the solvent replacement/azeotropic distillation drying method, the prepared nanometer gama-Al2O3 is high in specific area and even in particle distribution, and the particle sizes range from 30nm to 70nm. The prepared nanometer gama-Al2O3 is added in polymeric aluminium chloride and fully mixed to prepare the nanometer modified polymeric aluminium chloride. The waste water coagulating sedimentation effect of the polymeric aluminium chloride can be effectively promoted.

The invention particularly relates to a high purity alumina powder preparing device and a high purity alumina powder preparing method. The device comprises a reaction kettle, a stirrer, aluminium plates, a water cooled jacket and a micro-arc oxidation power source, wherein the stirrer is arranged inside the reaction kettle; the water cooled jacket is arranged outside the reaction kettle; a liner of the reaction kettle is connected with a negative electrode of the micro-arc oxidation power source; and the aluminium plates are hung inside the reaction kettle by aluminium wires, and are connected with a positive electrode of the micro-arc oxidation power source. According to the method, a micro-arc oxidation technology is adopted in a pure water system, aluminium hydroxide is produced, and hydrogen is released; water flow which is produced by a stirring technology is matched, and the produced aluminium hydroxide gel is rapidly separated from the surface of metallic aluminium, so that the metallic aluminium can continuously react with water; the technology is concise; the reaction speed is rapid; the efficiency is high; no pollution is caused; the surface shape of the metallic aluminium cannot form limitation; the phenomena that the metallic aluminium and hydrolyzate mutually wrap and agglomerate in the reaction process can be effectively reduced; a hydrolysis reaction can be thorough; and the productive rate is high.

The invention relates to a composite flocculant used in a spinning sewage treatment process. The composite flocculant consists of the following raw materials in parts by weight: 10-20 parts of thalluses of composite type flocculus producing bacteria F2 and F6, 15-20 parts of aluminium hydroxide gel and 3-10 parts of chitosan, wherein a weight ratio of F2 to F6 in the thalluses of composite type flocculus producing bacteria is (1-3) to 1. The composite flocculant is high in activity, safe and non-toxic and free of secondary pollution.

Disclosed are a mullite silicon corundum abrasive brick special for lime kiln and a preparation method. The material formula of the mullite silicon corundum abrasive brick special for the lime kiln comprises (1) alumina clinker, (2) alumina clinker, (3) alumina clinker, (4) alumina clinker, aluminium hydroxide gel, white corundum, carborundum and mullite. The preparation method comprises the steps of weighing and taking raw materials according to the proportion, adding the raw materials to a forced mixer, manufacturing the raw materials into mixing materials, manufacturing the manufactured mixed materials into blanks through a pressure brick manufacturing machine, placing the manufactured blanks in a low-temperature furnace, carrying out calcination and moulding to the blanks at low temperature of 550-600 DEG C, and a finished brick can be obtained. Through application of the brick as an inner lining brick on vertical lime kiln, during a process that the mullite silicon corundum abrasive brick is sintered, a silica enamel layer is formed on a fire face surface layer in a clinkering mode by the abrasive brick, abrasion-resisting property of the overall inner lining is improved, and service life of the lime kiln is obviously prolonged.

The invention relates to a preparation method for a Cu-base methanol-synthesizing catalyst large-specific-surface-area carrier, and belongs to the technical field of preparation of catalysts. The preparation method comprises: performing reaction on a soluble aluminium salt by taking a sodium-containing base or ammonia water as a precipitating agent, so as to obtain aluminium hydroxide gel, that is, a carrier precursor; and then adding 0.5%-1.5% of a surface dispersant Arabic gum into the carrier precursor, and processing for 20-30 min under ultrasonic effect, so as to prepare the large-specific-surface-area carrier with heat stability. The carrier and a parent compound are subjected to beating mixing, filtering, baking, roasting, forming and other processes, so that a copper-serial methanol-synthesizing catalyst sample is prepared. Compared with a sample prepared by employing a conventional method, the catalyst prepared by employing the disclosed method possesses relatively large specific surface area, and thus the catalyst possesses relatively good activity and heat stability.

The invention relates to a preparation method and a product of an insulation material used for industrial thermal equipment and boiler, which provides the preparation method and the product of the insulation material with advantages of good thermal insulation performance, low heat conduction coefficient, low production cost, little energy consumption, long product usage life, environmental protection and hurtlessness used for industrial thermal equipment and boiler. The preparation method comprises the following steps: adding urea CO(NH2)2 or ammonium hydroxide in an aluminum ion salt solution, performing a chemical reaction to obtain nano aluminium hydroxide gel; adding titanium dioxide with 2500 meshes in the nano aluminium hydroxide gel, according to the nano aluminium hydroxide gel with weight part of 79-96 parts, adding 6-21 parts of titanium dioxide, adding 10-20 parts of deionized water to obtain the nano aluminium hydroxide porous gel mixed with titanium dioxide; under 140-150 DEG C, and employing microwave heating for dehydrating to obtain the porous gamma-alumina wrapped titanium dioxide insulation material.

A preparing method of nanometer aluminium oxide is provided. The method includes: dissolving an aluminum salt into distilled water, adding a proper amount of a chelating agent, reacting under stirring for 10-20 min to obtain a wine-red transparent solution containing an aluminium ion chelate, adding dropwise and slowly a sodium hydroxide solution with a molar ratio of Al<3+> to OH<-> being 1:3, and reacting under stirring for 30 min until the reaction is finished, washing the precipitate with distilled water, drying the precipitate at 100 DEG C to obtain aluminium hydroxide gel, subjecting the aluminium hydroxide gel to high-temperature processing for 3-5 h, cooling the aluminium hydroxide gel to room temperature, taking out and grinding to obtain the nanometer aluminium oxide having a particle size of 3-15 nm. The method has characteristics of mild preparation conditions, simple process, easy operation, cheap and easily available raw materials and low cost. The prepared aluminum oxide is high in purity and stable in property, and is widely applied.