6 results about "Lanthanum nitrate" patented technology

This invention relates to a method for preparing nanoscale perovskite-type LaCoO3 by stearic acid gel combustion. The method comprises: (1) weighing lanthanum nitrate, cobalt nitrate and stearic acid at a mol ratio of 1 : 1 : (9.5-12.0); (2) heating in an oil bath, dissolving stearic acid, adding lanthanum nitrate and cobalt nitrate, magnetically stirring at 110-120 deg.C and reacting to obtain a gel; (3) combusting at 450 deg.C in a muffle furnace, taking out the product, milling and torrefying at 850 deg.C for 3 h in the muffle furnace to obtain 10-35 nm perovskite-type LaCoO3. The method is simple and suitable for mass production.

The invention discloses a method for preparing lithium manganate by a wet-doping method. By the wet-doping method, manganese chloride solution, ammonium bicarbonate solution and lanthanum nitrate solution are reacted in aqueous solution. Lanthanum hydroxide and manganese carbonate are generated in a coprecipitation way. Manganic manganous oxide-doped crystals are obtained after high-temperature calcination, crushing and grading. Lithium carbonate and the manganic manganous oxide-doped crystals are mixed according to the molar ratio of lithium to manganese, and the molar ratio is 1.15:2. After being mixed effectively and uniformly, the above mixture is put into a kiln to be sintered at a high temperature. After cooling, crushing, grading, sieving and deironing of the sintered materials, spinel-shaped and lanthanum-doped lithium manganate is obtained. The method can combine materials and doping elements tightly. During the high-temperature calcination reaction, the doping elements can be inserted into crystal structures to be doped completely and fused with the doped crystals together. The doping of lanthanum element can raise the average oxidation state of manganese ions, inhibit Jahn-Teller effect effectively, reduce the capacity fading and raise the cycle performance.

The invention discloses a preparation method of a composite phosphorus removal adsorbent lanthanum oxycarbonate loading montmorillonite, and relates to a preparation method of a composite phosphorus removal adsorbent. The invention aims to solve the technical problems of multiple preparation processes, small adsorption capacity, difficulty in recycling a powdery adsorbent, high treatment cost andeasiness in causing secondary sludge of the existing phosphorus removal adsorbent. The method comprises the following steps: dissolving montmorillonite in a strong acid solution, uniformly stirring, repeatedly washing the acid-modified montmorillonite with deionized water until the montmorillonite is neutral, carrying out suction filtration, drying the filter cake to obtain modified montmorillonite, weighing a certain amount of lanthanum nitrate and glycine according to a molar ratio, putting into a beaker, adding a small amount of deionized water, uniformly stirring, adding a certain amount of modified montmorillonite, adding a small amount of deionized water, continuously stirring to uniformly mix, transferring into a drying oven, drying, transferring the precursor into a muffle furnace,calcining, cooling to room temperature, and uniformly grinding to obtain the composite phosphorus removal adsorbent lanthanum oxycarbonate loaded montmorillonite, which can be used in the field of phosphorus-containing wastewater treatment.

The invention discloses an efficient total-nutrient chelate fertilizer and a preparation method of the efficient total-nutrient chelate fertilizer, and belongs to the technical field of crop fertilizers. The efficient total-nutrient chelate fertilizer is prepared from the following raw materials by weight: 650-750 parts of urea, 800-100 parts of monopotassium phosphate, 80-120 parts of potassium humate, 75-85 parts of calcium chloride, 55-65 parts of magnesium sulfate, 18-22 parts of ferrous sulfate, 20-25 parts of manganese sulfate, 20-25 parts of copper sulfate, 20-25 parts of zinc sulfate,2-4 parts of ammonium molybdate, 40-60 parts of citric acid, 50-60 parts of tartaric acid, 90-110 parts of EDTA, 35-45 parts of boric acid, 15-20 parts of lanthanum nitrate, 25-30 parts of cerous nitrate, and 30-40 parts of a surfactant. The monopotassium phosphate, the compound trace element and the rare earth element chelate are compounded, the trace element and the rare earth element exist in the non-precipitate inorganic form, and the defect that the traditional micro element fertilizer cannot be compounded with the phosphate is overcome.