Simple method for preparing sprayed chrome oxide

A chromium oxide, simple technology, applied in the direction of chromium oxide/hydrate, etc., can solve the problems of high energy consumption, complicated process, and long time consumption, and achieve the effect of simple process, reduced energy consumption, and shortened calcination time

Inactive Publication Date: 2015-06-17
HEBEI UNIV OF ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to solve the problems existing in the current preparation of sprayed chromium oxide such as complex process, long time consumption, and large energy consumption, and realize simpler and low-cost preparation conditions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1.8~3g K 2 CrO 4 , 0.2-0.6g of methanol and 30g of water are evenly mixed, reacted in a closed system, the temperature is 180-240°C, and the reaction time is 60min; after the reaction, the obtained precipitate is taken out, washed, dried at 110°C, and then calcined at 1000°C After 2h, a micron-scale sprayed chromium oxide that is approximately spherical is obtained.

Embodiment 2

[0023] 2~3.5g K 2 CrO 4 , 0.3~1.0g formaldehyde and 30g water are evenly mixed, reacted in a closed system, the temperature is 180~240°C, and the reaction time is 60min; After 2h, a micron-scale sprayed chromium oxide that is approximately spherical is obtained.

Embodiment 3

[0025] 2.2~4gNa 2 Cr 2 o 4 , 0.2-0.7g of methanol and 30g of water are evenly mixed, reacted in a closed system, the temperature is 180-240°C, and the reaction time is 60min; after the reaction, the obtained precipitate is taken out, washed, dried at 110°C, and then calcined at 1000°C After 2h, a micron-scale sprayed chromium oxide that is approximately spherical is obtained.

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Abstract

The invention belongs to the field of inorganic material preparation and especially relates to a method for preparing sprayed chrome oxide by a surfactant-free hydrothermal method. The method is characterized in that a used oxidizing agent is a metal cation-containing hexavalent chromium compound and a used reducing agent is small molecular alcohol or aldehyde, the reducing agent, the oxidizing agent and water are blended according to oxidizing agent concentration of 40g/l or more and a mole ratio of the reducing agent to the oxidizing agent of 0.2-5, then the reaction system undergoes a reaction at a constant reaction temperature of 140-300 DEG C under hydrothermal conditions for some time and generally for less than 120min, and the precipitates are washed, dried and calcined to form spherical micron-sized sprayed chrome oxide, wherein a calcining temperature is generally in a range of 800-1200 DEG C and calcining time is generally less than 2h. The method has simple processes, is superior to the prior art, and has low energy consumption and a good popularization value.

Description

field of invention [0001] The present invention relates to a kind of simple preparation spraying chromium oxide (Cr 2 o 3 ) method, particularly a method for preparing spray-coated chromium oxide by a surfactant-free 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 struc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G37/02
Inventor 裴振昭
Owner HEBEI UNIV OF ENG
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