Method for increasing purity of carbonyl iron powder

Abstract

The invention discloses a method for increasing the purity of carbonyl iron powder, and relates to a method for increasing the purity of the carbonyl iron powder by introducing gas into the common carbonyl iron powder for reduction. The method is characterized in that the process is as follows: reduction treatment is carried out on the carbonyl iron powder under the condition of introducing hydrogen, ammonia or mixed gas of hydrogen and water steam, the reduction temperature is 350 DEG C-850 DEG C, the reduction time is 0.5h-5h, and the use amount of gas is 1.0-50Nm<3> / kg (carbonyl iron powder). In the method for increasing the purity of the carbonyl iron powder, the operation is simple and convenient, the reduction treatment is carried out on the carbonyl iron powder by introducing the gas, detection and analysis are carried out on the obtained carbonyl iron powder, the content of iron in a product is greatly increased, the contents of impurities of carbon, oxygen and nitrogen are obviously reduced, and high-purity carbonyl iron powder is produced. For the carbonyl iron powder treated by the method, the purity is greatly increased, and is increased from 96 percent to more than 98.5 percent.

Description

technical field [0001] A method for improving the purity of carbonyl iron powder relates to a method for increasing the purity of carbonyl iron powder through gas reduction of common carbonyl iron powder. Background technique [0002] Ordinary carbonyl iron powder is produced by thermally decomposing the mixed gas of carbonyl iron, carbon monoxide and ammonia at a certain temperature and pressure. Due to the difficulty in controlling the process parameters such as the temperature field of the decomposer, and the small amount of ammonia and carbon monoxide The decomposition of ordinary carbonyl iron powder produced by ordinary carbonyl iron powder has relatively high impurity content of carbon, oxygen, and nitrogen, and it is difficult to meet the requirements of users in the high-end field. and equal impurity content to produce high-purity carbonyl iron powder. Contents of the invention [0003] The object of the present invention is to provide a method for improving the ...

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Problems solved by technology

[0002] Ordinary carbonyl iron powder is produced by thermally decomposing the mixed gas of carbonyl iron, carbon monoxide and ammonia at a certain temperature and pressure. Due to the difficulty in controlling the process parameters such as the temperature field of the decomposer, and the small amount of ammonia and carbon monoxide The decomposition of ordinary carbonyl iron powder produced by ordinary carbonyl iron powder has relatively high impurity content of carbon, oxygen, and nitrogen, and it is difficult to meet the requirements of users in the high-end field. Equal impurity content, produce high-purity carbonyl iron powder