42results about "Hydrotalcite" patented technology

The invention relates to the technical field of solid waste resource utilization, in particular to aluminum-based hydrotalcite synthesized through solid waste coal gangue in-situ crystallization and a preparation method and application of the aluminum-based hydrotalcite. The preparation method comprises the following steps: (1) mixing coal gangue with acid and water, stirring at 80-95 DEG C for 0.5-3 hours to remove impurities, filtering, washing and drying to obtain impurity-removed coal gangue; (2) roasting the impurity-removed coal gangue at 600-850 DEG C for 0.5-5 hours to obtain roasted coal gangue microspheres; and (3) mixing and reacting the roasted coal gangue microspheres with calcium salt / magnesium salt, acid and water, dripping alkali to adjust the pH value to be 7-9, aging, strengthening the phase seed crystal, dripping alkali to adjust the pH value to be 10-12, crystallizing at 100-150 DEG C for 12-72 hours, and post-treating to obtain the product. According to the method, coal gangue is used as an aluminum source, the crystallinity of aluminum-based hydrotalcite is improved, the cost is reduced, and solid waste recycling is achieved. The product can be used for flue gas desulfurization or used as an FCC sulfur transfer agent, has excellent desulfurization and sulfur transfer performance, and has a wide application prospect.

The invention discloses a magnesium-aluminum hydrotalcite / carbon nanotube composite material and a preparation method and application thereof, and the preparation method of the magnesium-aluminum hydrotalcite / carbon nanotube composite material comprises the following steps: S1, carrying out acid pretreatment on a carbon nanotube; and S2, preparing the magnesium-aluminum hydrotalcite / carbon nanotube composite material. Compared with the prior art, the preparation method of the magnesium-aluminum hydrotalcite / carbon nanotube composite material has the advantages that Mg (NO3) 2.6 H2O, Al (NO3) 3.9 H2O, CO (NH2) 2 and pretreated carbon nanotubes are adopted, and magnesium-aluminum hydrotalcite grows on the carbon nanotubes through a hydrothermal homogeneous precipitation method; through the synergistic effect of the carbon nanotubes and the magnesium-aluminum hydrotalcite, aggregation among nanoparticles is effectively prevented, the growth size of the particles is limited, and the magnesium-aluminum hydrotalcite / carbon nanotube composite material is good in crystallinity, small in particle size, high in specific surface area and high in adsorption performance. In a radioactive uranium element adsorption experiment, the adsorption efficiency is as high as 95.6%, and the adsorption capacity is as high as 17.32 mg / g.

The application discloses a hydrotalcite nanocomposite, a preparation method and application thereof. The composite material comprises hydrotalcite nanosheets and metal nanoclusters uniformly distributed on the hydrotalcite nanosheets; the metal nanoclusters are selected from any two of palladium nanoclusters, rhodium nanoclusters and ruthenium nanoclusters; the metal cations in the hydrotalcite nanosheets are divalent metal ions and trivalent metal ions; the divalent metal ions are selected from one or more of Cu 2+ , Mg 2+ and Ni 2+ ; the trivalent metal ions are selected from Al 3+ and / or Fe 3+ . The hydrotalcite nanocomposite has good catalase-like and glucose oxidase-like activities, can effectively relieve hypoxic microenvironment and consume glucose in tumor cells, further induce bisulfide death, and due to the two-dimensional confinement effect of the hydrotalcite nanosheets, can effectively increase the singlet oxygen production efficiency of noble metals, and realize tumor treatment of drugs.

The application discloses a hydrotalcite nanocomposite, a preparation method and application thereof. The composite comprises a high-entropy hydrotalcite nanosheet matrix and platinum nanoclusters loaded on the matrix; and cations in the layer plate of the high-entropy hydrotalcite nanosheet matrix comprise cations of Cu, Mn, Co, Ni and Fe. A nanomedicine for treating tumors prepared by using the hydrotalcite nanocomposite has excellent catalytic ROS generation capacity.

The invention provides a hydrotalcite-based two-dimensional material and a preparation method thereof, and the preparation method comprises the following steps: S1, carrying out heat treatment on hydrotalcite at 300-600 DEG C to obtain a metal oxide; s2, dispersing a metal oxide in water to form a turbid liquid; and carrying out ultrasonic treatment on the turbid liquid in an ice bath until the turbid liquid becomes gel, and then drying to obtain the hydrotalcite-based two-dimensional material. According to the method, few-layer and single-layer two-dimensional materials can be obtained through a simple and mild preparation process.

The present invention provides a method for producing layered double hydroxides with high water permeability. [Solution] The method for producing layered double hydroxide includes a production step of mixing an acidic solution and an alkaline solution to produce a slurry-like layered double hydroxide, and a filtration step of filtering the slurry-like layered double hydroxide, wherein the temperature of the layered double hydroxide in the production step is maintained at 30°C or lower and within a temperature range where it does not freeze.

The invention provides a quenching crystallization reaction system for preparing layered composite metal hydroxides and a corresponding preparation method, a high-pressure cooling distributor is additionally arranged between a reaction kettle and a collecting tank, and the high-pressure cooling distributor comprises a cavity and a quenching device which are communicated with each other; and a low-temperature cooling medium enters the cavity from the quenching device, is in direct contact with the high-temperature reaction slurry and rapidly cools the high-temperature reaction slurry, so that the layered composite metal hydroxide with the surface defect active site can be obtained. According to the invention, a cooling liquid system consistent with hydrotalcite reaction slurry is adopted, construction of defect active sites is realized for hydrotalcite through a quenching type cooling mode under the condition of not introducing impurities, the product performance can be effectively improved, the equipment requirement is low, the process is simple, the cost is effectively reduced, and the method is suitable for industrial production. And meanwhile, the impurity ion introduction problem caused by acid-base solvent etching and the like is also avoided, the process cleanliness is guaranteed, and the method is very suitable for industrial implementation.

The invention relates to the technical field of treatment of heavy metal ions in soil, and discloses a preparation method and application of a flower-like soil heavy metal ultra-stable mineralizer. A coprecipitation method is adopted, an alkali source is provided for a system through amino alcohol, a metal precursor preferentially grows in the specific direction in the reaction process, and then nanosheets are driven to be spontaneously assembled into a three-dimensional flower-shaped structure. Meanwhile, the amino alcohol can expand interlayer channels and enhance the anion exchange capacity of the material. The finally obtained hydrotalcite with the three-dimensional flower-shaped structure can efficiently adsorb and fix heavy metal ions in soil.

This invention relates to the field of solid waste resource utilization technology, specifically to the in-situ crystallization synthesis of aluminum-based hydrotalcite from solid waste coal gangue, its preparation method, and its application. The preparation method includes: (1) mixing coal gangue with acid and water, stirring at 80-95℃ for 0.5-3h to remove impurities, filtering, washing, and drying to obtain impurity-removed coal gangue; (2) calcining the impurity-removed coal gangue at 600-850℃ for 0.5-5h to obtain calcined coal gangue microspheres; (3) reacting the calcined coal gangue microspheres with calcium / magnesium salts, acid, and water, adjusting the pH to 7-9 with alkali, aging, adding solid phase seed crystals, adjusting the pH to 10-12 with alkali again, crystallizing at 100-150℃ for 12-72h, and then processing to obtain the product. This method uses coal gangue as the aluminum source, improves the crystallinity of aluminum-based hydrotalcite, reduces costs, and realizes solid waste resource utilization. The product can be used for flue gas desulfurization or as an FCC sulfur transfer agent. It has excellent desulfurization and sulfur transfer performance and has broad application prospects.

The invention relates to the technical field of fine chemical engineering, in particular to a method for recycling hydrotalcite production wastewater. The method comprises the following steps: carrying out filtration and synthetic reaction conversion on wastewater generated in hydrotalcite production, and carrying out heating reaction, filtration and drying to obtain the finished product hydrotalcite. According to the method provided by the invention, the wastewater generated in the hydrotalcite production process can be converted into the finished product hydrotalcite again, the reduction rate of OH <-> in the wastewater reaches 90% or above, the reduction rate of CO3 < 2-> reaches 82% or above, and material waste and environmental pollution are reduced; the method provided by the invention is low in production wastewater treatment cost and convenient to operate.

The invention relates to a method for preparing a suspension of layered double hydroxide particles, which comprises the following steps: putting a solution containing a layered double hydroxide precursor into heat preservation equipment for heat locking treatment, and reacting to obtain the suspension of the layered double hydroxide particles, in the heat locking treatment, the temperature is maintained only through heat preservation equipment under the normal pressure condition. The method disclosed by the invention has the beneficial effects that the locking heat treatment is carried out through heat preservation equipment, the layered double hydroxide precursor does not need to be continuously heated and pressurized, and the high-quality layered double hydroxide particles with high crystallinity and uniform morphology can still be synthesized under the condition of normal pressure.

The present invention provides a novel method for producing an ion-exchanged hydrotalcite, the method including no complicated steps, needing no massive equipment, and enabling a hydrotalcite to be ion-exchanged while inhibiting the formation of a by-product, etc. This method for producing an ion-exchanged hydrotalcite (3) is characterized by comprising a first step, in which a powdery or pasty hydrotalcite (1) is mixed and reacted with an aqueous solution of an acid (2) so that the resultant mixture has a water content in the range of 10-60 mass%, and a second step, in which a reaction product obtained in the first step is dried and pulverized without via a cleaning step.

The present invention provides a double metal layered hydroxide represented by the formula [M(II) 1‑x M(III) x (OH)2] x+ (A n‑ ) x / n ·mH2O, wherein M(II) contains a divalent cation selected from at least one of Mg, Zn, Ca, Ni, Co, Cu, Fe, Mn, and Sr, M(III) contains a trivalent cation selected from at least one of Al, Fe, Cr, Co, In, Ga, and V, A n‑ contains an anion selected from at least one of CO3 2‑ , OH ‑ , F ‑ , Cl ‑ , SO4 2‑ , NO3 ‑ , PO4 3‑ , B(OH) ‑ , VO4 3‑ , MnO4 ‑ , ClO4 ‑ , a carboxylate, a sulfonate, a sulfinic acid, and a thiocarboxylate, x is 0 < x < 1, n is the valence of A, and m is a number of 0 or more, and the double metal layered hydroxide has an average particle diameter D50 of 0.3 to 1.0 μm, a BET specific surface area of 8 to 25 m 2 / g, and a crystallite size of a D003 plane of 340 to 400 angstroms.

The application discloses a method for preparing ultrathin layered composite metal hydroxide by using an atom economy reaction. The method uses divalent and trivalent metal hydroxide and an amide compound as raw materials, and through ultrasonic-assisted strengthening separation, ultrathin LDHs nanosheets with a c-axis direction size of only 2-3 nm are synthesized in one step. The amide compound raw material is hydrolyzed to generate formate, acetate and the like into the interlayer of the LDHs under a hydrothermal environment, the carboxyl group of the amide compound raw material is attached to the surface of the LDHs nanosheet, hydrogen bonds are formed between the carboxyl group and the hydroxyl group on the surface of the nanosheet, the hydrogen bonds between the hydroxyl group and the interlayer water molecules are prevented from being formed, the electrostatic attraction between the LDHs layers is reduced, the mutual accumulation between the layers is weakened, and the separation of the LDHs layers is further promoted under the high-frequency oscillation of the ultrasonic wave, the thickness of the layer accumulation is significantly reduced, and the ammonia water generated in the reaction can be recycled and reused, and the product can be obtained without washing.

This invention belongs to the field of flame retardant technology, specifically relating to a red mud-based nano-flame retardant, its preparation method, and its application. The invention involves mixing red mud with a carbon-containing reducing agent and subjecting it to reduction roasting. Iron oxides in the red mud are reduced to metallic iron. Then, the metallic iron is dissociated through crushing and grinding. Magnetic separation is then used to separate the magnetic product (metallic iron) and the non-magnetic product (aluminum-rich slag, mainly containing alumina). The aluminum-rich slag, magnesium additives, and water undergo a mechanochemical reaction in a CO2 atmosphere. Under mechanochemical action, the alumina in the aluminum-rich slag and the magnesium in the magnesium additives react with water and carbon dioxide to form magnesium aluminum carbonate-type hydrotalcite, resulting in a red mud-based nano-flame retardant containing hydrotalcite components.

The invention belongs to the technical field of solid waste resource utilization and aqueous solution and soil remediation, and discloses a method for preparing dolomite-coal gangue-based hydrotalcite based on an ice crystal precipitation method and application of the method, and the method comprises the following steps: crushing, grinding and sieving dolomite and coal gangue samples, and calcining in a muffle furnace for later use; then dolomite acidolysis liquid and coal gangue acidolysis liquid are obtained through an acid adding extraction method under the water bath heating and stirring conditions; treating the two acidolysis solutions by adopting an ice crystal precipitation method to obtain a high-purity acidolysis solution; then, mixing the two high-purity acidolysis solutions, and adding a NaOH solution to adjust the pH value of the system; carrying out hydrothermal reaction after adjusting; and after the reaction is finished, naturally cooling the system to room temperature, and sequentially washing, centrifuging, drying and grinding to obtain the dolomite-coal gangue based hydrotalcite powder material. The invention has the advantages of simple preparation and low cost, and can be widely applied to aqueous solution and soil remediation.

A method for regenerating a used carbonate-type Mg-Al layered double hydroxide in which at least some of interlayer carbonate ions of a carbonate-type Mg-Al layered double hydroxide are exchanged with another anion includes contacting the used carbonate-type Mg-Al layered double hydroxide with a carbon dioxide-containing gas that contains carbon dioxide in the presence of an alkali.

Provided is an aluminum material provided with a corrosion-resistant film by steam treatment, which can exhibit excellent corrosion resistance. **Solution**: It relates to an aluminum material comprising a base material made of aluminum or an aluminum alloy and a corrosion-resistant film formed on at least a part of the base material. The corrosion-resistant film contains at least one kind of aluminum hydroxide oxide and an Al-based layered double hydroxide (Al-based LDH) represented below. And the Al-based LDH essentially contains an Al-based LDH whose anion component is nitrate ion. Also, in the present invention, the Al-based LDH is preferentially oriented on the (003) plane. TIFF2026049968000006.tif11149 M1 is a divalent metal element and is any one of Co, Zn, Mg, Cu, Mn, Fe, Ni, Cr, Cd, Ca, and M1 2+ is a divalent metal ion. The anion component A n- is OH - , CO3 2- , NO3 - , SO4 2- , F - , Cl - is at least any one of them.

The invention discloses a sustained-release medicinal enteric-coated material and a preparation method thereof, and relates to the field of enteric-coated materials. When the sustained-release medicinal enteric-coated material is prepared, talcum powder, tannic acid and ferric chloride hexahydrate are uniformly mixed and react to obtain modified talcum powder; uniformly mixing an emulsifier, a molecular weight regulator, a pH buffer agent, a comonomer and an initiator, and reacting to obtain modified polyacrylic resin; and uniformly mixing the modified polyacrylic resin, the modified talcum powder, polyvinylpyrrolidone and absolute ethyl alcohol to obtain the sustained-release medicinal enteric-coated material. The slow-release medicinal enteric-coated material prepared by the invention has excellent enteric solubility, slow release property and anti-inflammatory property.

The invention belongs to the technical field of nanofluid materials, and particularly relates to hydrotalcite nanofluid and a preparation method thereof. The preparation method comprises the following steps: mixing a mixed salt solution (divalent metal salt and aluminum salt) and a mixed alkali solution (sodium hydroxide and sodium carbonate), carrying out a co-precipitation reaction, carrying out solid-liquid separation, and washing the obtained precipitate to obtain a hydraulically gypsum-like precipitate; and dispersing the hydraulically gypsum-like precipitate in an alcohol-water mixed solvent for high-temperature crystallization to obtain the hydrotalcite nanofluid. According to the invention, a one-step process route is innovatively adopted to realize technical breakthrough, rich hydroxyl groups on the surface of the hydrotalcite material endow the nanoparticles with hydrophilicity, the main body laminate has positive charges to maintain dispersion stability through electrostatic repulsion, and a long-term stable system can be formed without depending on an exogenous stabilizer. The hydrotalcite nanofluid prepared by the invention has super-long stability, can be kept at room temperature for 8 months without generating sedimentation, and can meet the requirements of practical application.

To provide an apparatus for manufacturing a layered double hydroxide that can reduce effort when switching a manufacturing target and shorten a time required for the switching.SOLUTION: An apparatus for manufacturing a layered double hydroxide by mixing an acid solution and an alkaline solution comprises: a mixing unit that mixes the acid solution and the alkaline solution; a first supply unit that supplies a first acid solution to the mixing unit; a second supply unit that supplies a second acid solution different from the first acid solution to the mixing unit; and a supply switching unit that switches between a state where the first acid solution is supplied from a first pipe connected to the first supply unit to the mixing unit and a state where the second acid solution is supplied from a second pipe connected to the second supply unit to the mixing unit.SELECTED DRAWING: Figure 1

A composite material, wherein the composite material contains aluminum alloys with at least one of alkaline-earth metals and transition metals, and are used for removing pollutants by dissolving to release divalent metal ions, trivalent aluminum ions and hydroxide ions, which contact with other divalent and trivalent metal cations and anions in the contaminated water, to perform an in situ self-assemble of two-dimensional Layered Double Hydroxides (LDH) precipitates; consists of 18-70 weight % of aluminum metal, 30-80% weight of a second type of metal, and 0-2 weight % of an auxiliary agent; has a particle size of 0.01-3 mm; and preferably forms a micro-nano Alloy@LDH composite material with a core-shell structure by pretreating with dilute HCl. The present invention is used for soil remediation or sewage purification, and is suitable for chemical removal and degradation of complex contaminants from an acidic to alkaline environment.

The invention provides a synthetic method of a hydrotalcite-like compound and the hydrotalcite-like compound, and relates to the technical field of layered mineral materials, and the synthetic method comprises the following steps: dropwise adding a metal salt solution into a mixed solution of an ammonia water-ammonium chloride buffer pair and a target anion salt to obtain a reaction mixed solution, and heating the reaction mixed solution to 100-180 DEG C, and aging for 8-48 hours to obtain the hydrotalcite-like compound. Metal ions in the metal salt solution comprise divalent metal ions and trivalent metal ions, and in the reaction mixed solution, the concentration of the divalent metal ions is 0.01-0.12 mol / L, and the concentration of the trivalent metal ions is 0.001-0.05 mol / L; in the mixed solution, the concentration of the target anions is 0.012 to 10 mol / L. The method comprises the following steps: directly dropwise adding a metal salt solution into a mixed solution of an ammonia water-ammonium chloride buffer pair and a target anion salt to obtain a reaction mixed solution, aging the reaction mixed solution at 100-180 DEG C for 8-48 hours, and controlling the concentration of target anions, the concentration of metal ions and aging conditions to obtain LDHs crystal grains with uniform particle size and larger size.

The present invention provides hydrotalcite that does not cause thickening of the resin or a decrease in its mechanical properties, and that exhibits excellent anion scavenging performance in the resin. [Solution] Hydrotalcite containing magnesium and aluminum, wherein the hydrotalcite is particulate and the primary particles have a plate-like shape. The primary particles have an average plate diameter with a major axis of 400-700 nm and an aspect ratio (average plate diameter major axis / average plate diameter minor axis) of 1.4-2.0. Hydrotalcite for electronic materials characterized by the following features.

The application relates to the technical field of lithium extraction and resource utilization, and particularly discloses a method for preparing lithium carbonate by purifying a lithium-containing solution through an adsorption-pressurized desorption method, which comprises the following steps: step (1), preparing a granular lithium adsorbent, comprising the following steps: step a, mixing LiCl, AlCl3.6H2O, urea, deionized water, sodium oleyloxyethanesulfonate to obtain a liquid adsorbent, then performing suction filtration to remove the filtrate, and preparing a powder adsorbent; step b, mixing the powder adsorbent, DMF and ethylene-vinyl acetate copolymer, then adding water, and aging to prepare the granular lithium adsorbent; step (2), passing the lithium-containing solution into the granular lithium adsorbent, then performing pressurized desorption through flushing with a desorbent after adsorption saturation, and obtaining a lithium-rich desorption solution; and step (3), performing heating decomposition on the lithium-rich desorption solution, then performing crystallization, and obtaining lithium carbonate. The lithium extraction method has the advantages of large lithium extraction capacity, good effect and low cost.

The invention provides hydrotalcite that can inhibit foaming and can exhibit excellent heat stability when added to resins such as chlorine-containing resins, while also inhibiting resin coloration, without the combined use of additives with the resins. The hydrotalcite of the invention is represented by formula (1) and has a specific surface area of 120 m2 / g to 250 m2 / g as determined by the BET method.         M2+xZny·M3+zOx+y+(3 / 2)z     (1) (In the formula, M2+ represents at least one divalent metal ion, M3+ represents at least one trivalent metal ion, and x, y and z represent numbers satisfying 0 < x ≤ 0.5, 0 < y ≤ 0.2 and 0 < z <_ 0.4.)

The application provides a naphthalene carboxylic acid and / or derivative acid intercalated layered double hydroxide and a preparation method thereof. The preparation method comprises: reacting a mixed system containing naphthalene carboxylic acid and / or derivative, or alkali metal salt of naphthalene carboxylic acid and / or derivative, divalent metal chloride, trivalent metal chloride and alkali to obtain the naphthalene carboxylic acid and / or derivative acid intercalated layered double hydroxide. The preparation method of the application uses magnesium chloride and aluminum chloride as metal ion sources, naphthalene carboxylic acid and / or derivative or salt thereof as anion source, and sodium hydroxide or potassium hydroxide as alkali source to prepare the LDHs, solves the problems of low flame retardant efficiency, poor ultraviolet resistance of common layered double hydroxide fillers and the problem that common layered double hydroxide fillers cannot have both flame retardant and ultraviolet resistance, and can simultaneously improve the flame retardant property and ultraviolet absorption property of the layered double hydroxide.

This invention discloses a method for synthesizing magnesium aluminum hydrotalcite, comprising the following steps: (1) mixing magnesium oxide, magnesium bicarbonate, aluminum hydroxide, and sodium hydroxide, then adding an ethanol aqueous solution for wetting and grinding; (2) gradually increasing the temperature while grinding, and then maintaining the temperature for reaction; (3) after the reaction is completed, restoring to room temperature, filtering, washing with water, and drying to obtain magnesium aluminum hydrotalcite. The magnesium aluminum hydrotalcite obtained by this invention has high crystallinity, small particle size and good particle size dispersion, high purity, no impurities, and high yield.

The present invention provides a novel method for producing an ion-exchanged hydrotalcite, the method including no complicated steps, needing no massive equipment, and enabling a hydrotalcite to be ion-exchanged while inhibiting the formation of a by-product, etc. This method for producing an ion-exchanged hydrotalcite (3) is characterized by comprising a first step, in which a powdery or pasty hydrotalcite (1) is mixed and reacted with an aqueous solution of an acid (2) so that the resultant mixture has a water content in the range of 10-60 mass %, and a second step, in which a reaction product obtained in the first step is dried and pulverized without via a cleaning step.

The application discloses a kind of sustained-release medicinal enteric material and preparation method thereof, and relates to the field of enteric material.In the preparation of sustained-release medicinal enteric material, talcum powder, tannic acid and iron chloride hexahydrate are mixed and reacted to obtain modified talcum powder;Emulsifier, molecular weight regulator, pH buffer, comonomer and initiator are mixed and reacted to obtain modified polyacrylic acid resin;Modified polyacrylic acid resin, modified talcum powder, polyvinylpyrrolidone and anhydrous ethanol are mixed to obtain sustained-release medicinal enteric material.The sustained-release medicinal enteric material prepared by the application has excellent enteric solubility, sustained-release property and anti-inflammatory property.