A kind of in-situ core-shell structure iron molybdate powder and preparation method thereof

Abstract

The invention relates to an in-situ core-shell structure iron molybdate powder and a preparation method thereof. Its technical scheme is: get two parts of deionized water identical in volume, by iron salt: molybdate molar ratio is 1: (1.3~1.8), described iron salt and described molybdate are respectively dissolved in the described In deionized water, the corresponding iron salt solution and molybdate solution were obtained. Under the conditions of water bath and stirring, the iron salt solution is evenly added to the molybdate solution to obtain a mixed solution; the mixed solution is transferred into a stainless steel reaction kettle and kept at 130-210°C for 1 ~24h, a solution containing precipitate was obtained. The solution containing the precipitate is washed with deionized water until neutral, and dried at 90-110° C. for 20-30 hours to obtain an iron molybdate powder with an in-situ core-shell structure. The invention has the advantages of simple process, low cost and easy control of reaction, and the obtained in-situ core-shell structure iron molybdate powder has controllable particle size and good catalytic effect.

Description

technical field [0001] The invention belongs to the technical field of iron molybdate powder. Specifically relates to an in-situ core-shell structure iron molybdate powder and a preparation method thereof. Background technique [0002] Carbon-containing refractories have excellent physical and chemical properties, such as excellent high-temperature mechanical properties, thermal shock resistance and slag erosion resistance, and are widely used in sliding bricks of sliding nozzle systems in ladles, ladle upper and lower nozzles, and tundish nozzles And the three major pieces of continuous casting. With the development of iron and steel metallurgy technology, higher requirements are put forward for carbon-containing refractory materials. For example, the main requirements of continuous casting process for refractory materials are: high temperature resistance, no reaction with molten steel, strong slag resistance and high thermal shock resistance, etc. Ordinary carbon-contain...

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Problems solved by technology

"A preparation method of iron molybdate nanocone material with lamellar structure" (CN201110347429.4) patented technology, although the microwave radiation method is used to prepare iron molybdate with a thickness of 20-40 nanometers and a length of 5-15 microns Nano-cone materials, but the method is difficult to process and requires professional microwave radiation equipment, which is difficult to apply on a large scale; "A method for preparing iron (II) molybdate nano-cubes" (CN201410051059.3) patented technology, using sodium acetate and Polyvinylpyrrolidone is used as an auxiliary agent to prepare iron (II) molybdate nanocubes by a one-step liquid phase method. Although this method obtains nanoscale iron molybdate cubes, polyvinylpyrrolidone is a carcinogen, which is harmful to environmental protection and human health. Unfavorable; "Synthetic method of iron molybdate powder" (CN201610947035.5) uses Fe powder, Fe 2 o 3 Powder and MoO 3 Ferric molybdate powder was used as raw material. Although ferric molybdate powder was obtained at 1000-1200°C, the synthesis temperature was high and the powder morphology was difficult to control; "a monoclinic iron molybdate nanosheet with high activity and exposed crystal plane "Preparation method" (CN107213904A) patented technology, using ferric nitrate, sodium molybdate and sodium nitrate as raw materials, though the iron molybdate powder of (100) surface is prepared by hydrothermal reaction, but this method is difficult to apply on a large scale; A flaky iron molybdate photocatalyst for dye wastewater treatment and its preparation method” (CN201810163420.X) patented technology, using sol-gel method to prepare flaky iron molybdate powder, although the specific surface area is large and the dispersibility is good, but The process is complex and requires continuous heating and drying processes

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