8 results about "Lanthanum carbonate" patented technology

This invention discloses an antifouling membrane made of lanthanum-loaded carbon nanomaterials suitable for phosphorus recovery in wastewater, its preparation method, and its applications. The invention involves loading lanthanum carbonate octahydrate onto the surface of multi-walled carbon nanotubes (MWCNTs) to form lanthanum-loaded carbon nanomaterials (La@MWCNTs), which are then deposited onto the surface of a polyethersulfone-based membrane using vacuum filtration to form a self-supporting membrane. The prepared lanthanum-loaded carbon nanomaterial antifouling membrane possesses both phosphorus removal and recovery capabilities, exhibiting high efficiency in phosphorus removal from water. This facilitates phosphorus elution and recovery, effectively solving the problems of lanthanum-loaded carbon nanomaterial aggregation and recovery, and effectively avoiding the risk of lanthanum-based adsorbent leakage during phosphorus removal. Furthermore, the lanthanum-loaded carbon nanomaterial antifouling membrane operates within a low-pressure range, exhibiting low energy consumption and effectively mitigating membrane fouling caused by humic acid. It shows promising application prospects in wastewater phosphorus recovery and eutrophication control.

This invention belongs to the field of polymer composite materials technology, specifically relating to a method for preparing and applying an antibacterial agent for ABS composite materials. The method involves reacting lanthanum acetate, sodium carbonate, anhydrous ethanol, and deionized water in a reactor to obtain solution A. Solution A is then filtered, washed, dried, and cooled to obtain lanthanum carbonate. The lanthanum carbonate is then calcined to obtain lanthanum oxide. Lanthanum oxide, linalool, 3-isocyanopropyltrimethoxysilane, anhydrous ethanol, and deionized water are reacted to obtain an antibacterial agent of the linalool / 3-isocyanopropyltrimethoxysilane / lanthanum oxide type. This antibacterial agent is then used in ABS to prepare antibacterial ABS composite materials. The antibacterial agent of this invention inhibits the metabolic activity of bacteria by interfering with their respiratory chain function. Furthermore, lanthanum ions, with their high positive charge density, adsorb onto the bacterial cell membrane surface, disrupting normal cellular physiological functions and thus killing the bacteria.

This invention relates to a hexagonal basic lanthanum carbonate and its preparation method, belonging to the field of rare earth compound technology. It addresses at least one of the problems of existing methods for synthesizing hexagonal basic lanthanum carbonate, including the presence of impurity phases in the product, dependence on high-temperature and high-pressure synthesis conditions, high cost and energy consumption, long reaction cycles, and low production efficiency, which are unfavorable for large-scale continuous production. This invention uses a lanthanum salt solution and a mixed precipitant, controlling the molar ratio of NH3·H2O and ammonium bicarbonate in the mixed precipitant, as well as the ratio of the total amount of NH3·H2O and ammonium bicarbonate added to water to the amount of lanthanum ions, to carry out the precipitation reaction and aging. Under normal pressure and mild conditions, a single-phase hexagonal basic lanthanum carbonate is prepared, avoiding the high energy consumption and safety hazards caused by high-temperature and high-pressure conditions. The process is simple and suitable for large-scale production.

The application discloses a preparation method of thin sheet four-water lanthanum carbonate powder crystal based on microwave / ultrasonic technology, which comprises the following steps: (1) preparation of eight-water lanthanum carbonate, slowly drop sodium bicarbonate solution into lanthanum chloride solution, fully react for 2-5 hours at a reaction temperature of 30 DEG C; then, the final product is washed with water, filtered and dried to prepare eight-water lanthanum carbonate powder; (2) preparation of thin sheet four-water lanthanum carbonate powder crystal, the eight-water lanthanum carbonate powder prepared in the step (1) is placed in a solvent medium at room temperature, different microwave intensities are regulated to carry out rapid dehydration treatment; then, the product is peeled by means of high-frequency ultrasonic vibration, centrifuged and dried to obtain four-water lanthanum carbonate powder crystal product. The four-water lanthanum carbonate is prepared by means of microwave / ultrasonic technology, which can avoid the generation of basic lanthanum carbonate impurities, and the obtained four-water lanthanum carbonate is thin sheet and uniform in dispersion, and the purity is more than 99.5%.

This invention belongs to the technical field of automotive steel manufacturing, specifically relating to a green, low-carbon high-strength automotive steel and its preparation method. The invention adds nickel-doped modified niobium carbide to the high-strength steel, dispersing it in the iron matrix to effectively improve the strength and toughness of the steel plate and increase its porosity. Simultaneously, the addition of Ca, Mg, and lanthanum and cerium carbonate as composite refining agents to the alloy melt improves casting quality and mechanical properties. Furthermore, precise control of the composition of elements such as C, Mn, Si, Cr, Mo, Cu, and Ti, combined with hot rolling, cold rolling, continuous annealing, or hot-dip galvanizing processes, enables the material to possess both high strength and excellent porosity.

This invention discloses a method for indirectly producing lithium manganese oxide and a lithium manganese oxide composite material using a carbonate system. The method includes the following steps: pretreating a lithium source, a manganese source, lanthanum and cerium carbonate, and aluminum oxide for later use; weighing the lithium source and manganese source at a Li:Mn molar ratio of (0.50-0.53):1, and adding 0.8-1.2% lanthanum and cerium carbonate and 1.8-2.3% aluminum oxide by mass of the total mixture, and ball milling the mixture; placing the mixture in a sintering furnace for stepped heating sintering: heating at 2-4℃ / min to 400-450℃ and holding for 2-4h; heating at 2-4℃ / min to 570-630℃ and holding for 3-5h; heating at 2-4℃ / min to 720-790℃ and holding for 15-20h to generate lithium manganese oxide; and cooling to room temperature with the furnace to obtain the lithium manganese oxide composite material. The process of heating and decomposing lanthanum and cerium carbonate to generate oxides and release carbon dioxide can promote more uniform doping of rare earth sources and facilitate the formation of Ce. 3+ Partial doping is incorporated into the lithium manganese oxide lattice to form stable lithium-ion migration channels, thereby improving the overall electrical performance of lithium manganese oxide.

The present application relates to the technical field of ceramsite, in particular to a low-thermal-conductivity expanded ceramsite based on rare earth modification and fly ash solid waste and a preparation method thereof, which is made of the following raw materials in parts by weight: 5-15 parts of high-aluminum poly-light waste brick powder, 40-60 parts of fly ash, 10-20 parts of waste anvil powder, 10-15 parts of coal gangue powder, 5-9 parts of rare earth modified light powder and 1-3 parts of additional additives. The rare earth modified light powder is prepared by wet co-grinding, spray granulation and high-temperature sintering of fly ash powder and lanthanum cerium carbonate powder. The present application uses solid waste such as high-aluminum poly-light waste brick powder, fly ash, waste anvil powder and coal gangue powder to prepare low-thermal-conductivity expanded aggregate through scientific proportioning and reasonable process, and the raw materials are widely distributed, easy to obtain and low in cost. The sintering temperature in the preparation process is low, energy is saved, and the prepared product is low in density, high in strength, smooth in surface and low in water absorption.

The invention relates to a method for producing a lanthanum oxycarbonate powder, comprising the following steps: an initial step of grinding a powder comprising lanthanum hydroxide La(OH)3 in the presence of a control agent, the control agent comprising ethylene glycol and the grinding resulting in a paste, and a subsequent step in which the paste is subjected to a heating step for oxidising the La(OH)3 powder to give an La2O2CO3 powder.