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Process for preparing sprayed chromic oxide

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

Inactive Publication Date: 2015-03-18
HEBEI UNIV OF ENG
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  • Summary
  • 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, complicated process, long time consumption, high energy consumption, and easy broken products, so as to achieve more gentle and low-cost preparation conditions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1~4.5g K 2 CrO 4 , 0.3 ~ 1g methanol, 0.05 ~ 0.9g a mixture of polybasic acid and long-chain hydrocarbon polyammonium salt and other cations 1 # mixed with 30g water, react in a closed system, the temperature is 160 ~ 240 ℃, the reaction time is 60min; After the end, the obtained precipitate was taken out, washed, dried at 110°C for 5 hours, and then calcined at 1000°C for 2 hours to obtain a nearly spherical micron-scale sprayed chromium oxide.

Embodiment 2

[0022] 0.5~3.5g K 2 CrO 4 , 0.5-1.2g formaldehyde, 0.01-0.7g a certain polybasic acid and long-chain hydrocarbon-based polyammonium salt and other cation mixture 2#, mixed evenly with 30g water, and reacted in a closed system at a temperature of 180-240°C and a reaction time of 60 minutes; After the reaction, the obtained precipitate was taken out, washed, dried 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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PUM

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Abstract

The invention discloses a process for preparing sprayed chromic oxide, belongs to the field of inorganic material preparation, and particularly relates to a process for preparing sprayed chromic oxide by employing a hydrothermal process. The process is characterized by comprising the following steps: with a hexavalent chromium compound as an oxidant, a small molecular alcohol or aldehyde as a reducing agent, and a mixture of positive ions such as polyatomic acid and long-chain alkyl ammonium salt as a surfactant, mixing the raw materials according to the condition that the molar ratio (mol / mol) of the reducing agent to the oxidant is 0.1 to 5, the molar ratio (mol / mol) of the surfactant to the oxidant is 0.001-0.5, and the molar ratio (mol / mol) of the polyatomic acid to the long-chain alkyl ammonium salt in the surfactant is 0-100; keeping the reaction temperature constant at 100-300 DEG C in general under an initial hydrothermal condition; reacting for a period of time, wherein the general reaction time is shorter than 120 minutes; washing, drying and burning the obtained sediment, so as to obtain spherical micron grade sprayed chromic oxide, wherein the burning temperature is 600-1200 DEG C in general; and the burning time is shorter than 2 hours in general. The method is simple in process and low in energy consumption, and has promotional value; and the burning time is much shorter than that of an existing patent.

Description

field of invention [0001] The invention relates to a method for preparing sprayed chromium oxide (Cr 2 o 3 ) process, particularly a process for preparing sprayed chromium oxide by 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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Patent Type & Authority Applications(China)
IPC IPC(8): C01G37/033
CPCC01G37/033
Inventor 裴振昭
Owner HEBEI UNIV OF ENG
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