74results 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.

According to the present embodiment, there is provided a resin composition for bonded magnets which is excellent in physical properties such as heat resistance, bending strength, and IZOD impact strength without decreasing magnetic properties and which reduces generation of corrosive gas. There is provided: a resin composition for bonded magnets that includes a magnetic powder, a PPS resin, and a hydrotalcite powder, in which the content of the hydrotalcite powder is 0.1 to 25.0 wt% relative to the PPS resin; and a molded body of the resin composition for bonded magnets.

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 invention provides hydrotalcite for improving thermal stability and initial whiteness of PVC (polyvinyl chloride) and a preparation method of the hydrotalcite. The chemical composition of the hydrotalcite comprises M < 2 + > xM < 3 + > y (OH) 2x + 3y-x / 2 (CO3) x / 4. MH2O, wherein M < 2 + > is a divalent metal ion or a mixture of divalent metal ions and is selected from one or two of Mg < 2 + >, Ca < 2 + >, Ni < 2 + >, Zn < 2 + >, Mn < 2 + >, Cu < 2 + >, Co < 2 + >, Pd < 2 + > and Fe < 2 + >; m < 3 + > is a trivalent metal ion and is selected from one of Al < 3 + >, Ga < 3 + > and In < 3 + >; x and y are positive numbers, and the molar ratio of x to y satisfies x / y = 2.0-3.0; m is the content of crystal water, and m is 3.5-4.0. By regulating and controlling the specific surface area to be less than 20 m < 2 > / g, D50 to be less than 0.150 mu m and the grain size to be greater than or equal to 800 and combining a surface modification process, the compatibility and dispersity of the hydrotalcite and PVC are improved. The preparation method comprises the steps of raw material mixing and sanding, hydro-thermal synthesis, solid-liquid separation and washing, surface modification, drying and post-treatment, the hydrotalcite capable of improving PVC thermal stability and initial whiteness is obtained, the hydrotalcite can be uniformly dispersed in a PVC matrix, thermal decomposition is inhibited by absorbing HCl, the static aging time is prolonged, and meanwhile light scattering is reduced.

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.

The present invention provides a method for preparing magnesium-aluminum hydrotalcite from sludge. The preparation method comprises the following steps: Step 1: drying the sludge, ball-milling it, sieving it, and mixing it with a magnesium salt to form a mixture; pouring the mixture into an acid solution, stirring it, and letting it stand; collecting the supernatant to obtain a metal salt solution; and Step 2: mixing the metal salt solution and a mixed alkaline solution in deionized water, stirring to obtain a complex; transferring the complex to a reactor for crystallization; washing, filtering, separating, and drying to obtain the magnesium-aluminum hydrotalcite. The present invention can effectively utilize the magnesium-aluminum hydrotalcite prepared from the sludge. The product can be used as an adsorbent to treat heavy metal ion wastewater, has strong adsorption properties, and high yield, thereby achieving waste treatment with waste.

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.

To provide a composite of a hydrotalcite compound and an amino acid, with the composite having a high aspect ratio while allowing for control of coloration.SOLUTION: The present disclosure relates to a composite that includes a hydrotalcite compound and an amino acid. The composite has an aspect ratio of 85 or more. An Y.I. value of the composite is 0-5. The Y.I. value indicates yellowness. A content of the amino acid in the composite is more than 0 mass% and equal to or less than 10.0 mass%. The content of the amino acid is a content with respect to the total mass of the composite.SELECTED DRAWING: Figure 2

The invention provides an oxygen-containing small-molecule intercalated hydrotalcite, a rubber composite material, and a preparation method and application of the oxygen-containing small-molecule intercalated hydrotalcite and rubber composite material. The oxygen-containing small molecule intercalated hydrotalcite is obtained by mixing and reacting components including ethanol salt, methoxide and a solvent; the ethanol salt comprises divalent ethanol salt and trivalent ethanol salt; the rubber composite material is prepared from the following components: rubber, oxygen-containing small molecule intercalated hydrotalcite and a vulcanizing agent. The oxygen-containing micromolecule intercalated hydrotalcite prepared by the method has larger interlayer spacing and better dispersity in a rubber matrix, interlayer water can be removed at the temperature of 100 DEG C or below, the influence in the vulcanization process is avoided, and the oxygen-containing micromolecule intercalated hydrotalcite is suitable for a high-temperature vulcanization environment, is used in a rubber composite material and can improve the gas barrier property of the composite material.

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.

The invention discloses durable earthenware pot glaze slurry and an earthenware pot glazing and firing method. The earthenware pot glaze slurry is prepared from dihydrogen phosphate intercalated hydrotalcite, kaolin, potassium feldspar, borax, magnesium oxide and water. According to the invention, dihydrogen phosphate intercalated hydrotalcite is used as a main material for preparing the earthen pot glaze for the first time, and a compact and smooth specially-made glaze surface is prepared by utilizing the bonding assisting effect of an aluminum dihydrogen phosphate binder in the sintering process and specially-made acidic pores in the sintering process and matching with a specially-made salt boiling process; the glaze is soft and moist in color, smooth and compact in hand feeling, durable and resistant to dry burning, has the dry burning resistance and health care value of a marmite, and has wide market application prospects.

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.

The invention belongs to the field of hydrotalcite production, and particularly relates to a separation process of sodium sulfate in hydrotalcite mother liquor, which comprises the following steps: MVR (mechanical vapor recompression) evaporation: preheating wastewater to 70-100 DEG C, introducing the wastewater into a primary separator, performing secondary separation on secondary steam generated at the top of the primary separator, and performing mechanical compression to serve as a heating heat source of an evaporator; crystal mush at the lower part of the first-stage separator is conveyed by the circulating pump, heated by the evaporator and then returned to the first-stage separator, and condensed water is recycled. The MVR evaporation technology is adopted, so that compared with a traditional process, the MVR evaporation technology saves more than 75% of energy, and the operation cost is reduced; full-amount recycling of sodium carbonate is achieved through accurate regulation and control, and the raw material purchasing expenditure is reduced; the separated high-purity (90-98%) sodium sulfate is sold as a by-product, no waste solid is generated, and both economic and environmental benefits are considered; a novel method for regulating and controlling dissolution conditions based on a phase diagram breaks through the limitation of traditional separation, and sodium sulfate solids are efficiently and accurately separated.

The present invention pertains to a new nanostructured composite material with a layered hydrotalcite-type ternary structure of CuMgAI LDH (layered double hydroxides) and comprising particles of metal copper Cu° and particles containing cuprous ion Cu+ (such as cuprous oxide), as a redox couple Cu° / Cu+, preferably placed in intimate contact with the layered hydrotalcite-type structure.

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.

The application discloses a kind of amidoxime hydroslate-antimony alkene composite material and its preparation method and application, by first on the surface of hydroslate modification amino group, then using amino group graft modification cyano group, the cyano group is converted into hydroxamic acid group by amidoxime reaction, obtain amidoxime hydroslate;The amidoxime hydroslate dispersion is formed by dispersion, then with antimony alkene dispersion liquid is mixed and is mutually stacked to form two-dimensional layered composite material, by centrifugation, dry obtain.This composite material can effectively inhibit the agglomeration of antimony alkene and hydroslate nanosheet, and can increase the active site of material and uranium ion combination, be applied to the electrochemical detection of uranium ion, with high conductivity, high stability of antimony alkene, and high specificity adsorption of hydroslate.

The invention relates to a desiliconization method of chromite alkali liquor, in particular to the field of chromium salt production, and the desiliconization method comprises the following steps: adding magnesium salt into the chromite alkali liquor for stirring treatment, and then carrying out solid-liquid separation to obtain desiliconization liquid; wherein the solid-to-liquid ratio g / L of the magnesium salt to the chromite alkali liquor in the stirring treatment is (0.5-10): 1; the temperature of the stirring treatment is 30-95 DEG C; the stirring treatment time is 0.5 to 8 hours. According to the deep desilicication method, an adsorption-coprecipitation synergistic effect method is adopted, soluble magnesium salt is added firstly, specific reaction conditions are controlled, the magnesium salt and aluminum in the solution are subjected to an in-situ reaction to generate magnesium-aluminum hydrotalcite, and silicon in the chromite alkaline leaching solution is synchronously and deeply removed.

The present invention belongs to the field of biomedical materials, and more particularly relates to a composite modified hydrogel formulation and its preparation method. This composite modified hydrogel formulation comprises the following raw materials, calculated by weight: 0.8-1.5% bovine milk lipid microspheres grafted with hyaluronic acid, 0.1-0.3% modified magnesium-aluminum layered double hydroxide, and the balance deionized water. This composite modified hydrogel formulation exhibits high drug loading and excellent sustained-release properties.

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.