Spray chrome oxide preparation method

A technology of chromium oxide and oxidant, which is applied in the direction of chromium trioxide, chromium oxide/hydrate, etc., can solve the problems of long time consumption, high energy consumption, complicated process, etc., and achieve the effect of shortening calcination time, reducing energy consumption and simple process

Inactive Publication Date: 2013-08-14
HEBEI UNIV OF ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to solve the problems in the current preparation of sprayed chromium oxide, such as harsh control conditions, c

Method used

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  • Spray chrome oxide preparation method

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Effect test

Embodiment 1

[0021] 2~4g K 2 CrO 4 , 0.3 ~ 1g methanol, 0.05 ~ 0.7g of a certain polyol 1 # mixed with 30g of water, react in a closed system, the temperature is 180 ~ 240 ℃, the reaction time is 60min; after the reaction, take out the obtained precipitate, after washing, Dry at 110°C, and then calcined at 1000°C for 2 hours to obtain nearly spherical micron-scale sprayed chromium oxide.

Embodiment 2

[0023] 2~4g K 2 CrO 4 , 0.5~1.2g formaldehyde, 0.02~0.6g certain polyol 2# mixed with 30g water, react in a closed system, the temperature is 180~240°C, and the reaction time is 60min; after the reaction, take out the obtained precipitate and wash it , Dry at 110°C, and then calcined at 1000°C for 2 hours to obtain micron-sized spray-coated chromium oxide that is approximately spherical.

Embodiment 3

[0025] 2~4g CrO 3 , 0.3-1g methanol, 0.04-0.9g a polybasic acid 3# and 30g water are mixed evenly, react in a closed system, the temperature is 180-240°C, and the reaction time is 60min; Dry at 110°C, and then calcined at 1000°C for 2 hours to obtain nearly spherical micron-scale sprayed chromium oxide.

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Abstract

The invention relates to a spray chrome oxide preparation method, belongs to the inorganic material preparation field, and especially relates to a spray chrome oxide preparation method through a hydrothermal process. The method is characterized in that an oxidant is a hexavalent chromium compound, a reductant is micro-molecular alcohol or aldehyde, and a surfactant is polyol or polyprotic acid; and the method comprises following steps: mixing the reductant, the oxidant, the surfactant and water according to a reductant/oxidant ratio of 1-5(mol/mol) and a surfactant/oxidant ratio of 0.001-0.5(mol/mol), reacting at a constant reaction temperature of 100-300DEG C under an initial hydrothermal condition for a reaction period below 120min, washing the obtained precipitate, drying, and calcining at 800-1200DEG C for a period below 2h to obtain spherical micrometer controlled-spray chrome oxide. The method has the advantages of simple technology, realization of the calcining period far lower than that of present patents, less energy consumption, and popularization deserving.

Description

field of invention [0001] The invention relates to a method for preparing sprayed chromium oxide (Cr 2 o 3 ) method, particularly a method for preparing sprayed chromium oxide by a hydrothermal method. Background technique [0002] Spraying chromium oxide is chromium oxide (CrO) that is approximately spherical and has a particle size of more than 5 microns. 2 o 3 ), the common size is 5-200 microns. It is a high value-added product with superior performance, wide application and bright application prospect. It is resistant to grain wear, hard wear and particle erosion, resistant to acid, alkali, salt and various solvents, extremely stable to the atmosphere, high in hardness, small in friction coefficient, good in wear resistance and polishing performance, and is an excellent anti-corrosion wear layer Materials, mainly used for long-term anti-corrosion coatings on steel (such as large hydraulic steel structure gates, bridge steel structures, marine military, civil steel ...

Claims

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Application Information

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IPC IPC(8): C01G37/033
Inventor 裴振昭
Owner HEBEI UNIV OF ENG
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