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Method of utilizing carbonyl iron to produce high purity iron oxide

A carbonyl iron and iron oxide technology, which is applied in the field of preparation of high-purity iron oxide materials, can solve the problems that the purity of iron oxide needs to be improved

Inactive Publication Date: 2018-04-06
JINCHUAN GROUP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The traditional method is obtained by calcining ferrous sulfate, ferric oxide yellow or scrap iron at high temperature, or directly from liquid medium, but the purity of ferric oxide needs to be improved, and the impurity content is not the same due to different processes. Therefore, the preparation of high-purity iron oxide by a new process is a new development trend

Method used

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Effect test

Embodiment 1

[0014] A method for producing high-purity iron oxide using carbonyl iron, the specific process is as follows: (a) Pass the carbonyl iron liquid and oxygen-containing inert gas into the evaporator, heat the evaporator to control the temperature at 30°C to produce a mixture of carbonyl iron Gas, wherein the supply rate of carbonyl iron liquid is 0.20L / h, and the volume ratio of carbonyl iron liquid to inert gas containing oxygen is 1L:0.5m 3 , the volume ratio of oxygen and nitrogen in the inert gas containing oxygen is 1:4. (b) The mixed gas of carbonyl iron and the inert gas containing oxygen enter the reactor, and the flow rate of the mixed gas of carbonyl iron entering the reactor is 1.5m 3 / h, the volume ratio between the mixed gas of carbonyl iron and the inert gas containing oxygen is 1:2, and the volume ratio of oxygen and nitrogen in the inert gas containing oxygen is 1:4. Heating the reactor so that the temperature of the middle and upper zone in the reactor is: 300°C...

Embodiment 2

[0016] A method for producing high-purity iron oxide using carbonyl iron, the specific process is as follows: (a) Pass carbonyl iron liquid and oxygen-containing inert gas into the evaporator, heat the evaporator to control the temperature at 25°C to produce carbonyl iron mixed Gas, wherein the supply rate of carbonyl iron liquid is 0.30L / h, and the volume ratio of carbonyl iron liquid to inert gas containing oxygen is 1L:0.8m 3 , the volume ratio of oxygen and nitrogen in the inert gas containing oxygen is 1:10. (b) The mixed gas of carbonyl iron and the inert gas containing oxygen enter the reactor, and the flow rate of the mixed gas of carbonyl iron entering the reactor is 3.0m 3 / h, the volume ratio between the mixed gas of carbonyl iron and the inert gas containing oxygen is 1:4, and the volume of oxygen and nitrogen in the inert gas containing oxygen is 1:10. Heating the reactor so that the temperature of the middle and upper zone in the reactor is: 520°C, the temperatu...

Embodiment 3

[0018] A method for producing high-purity iron oxide using carbonyl iron, the specific process is as follows: (a) Pass the carbonyl iron liquid and oxygen-containing inert gas into the evaporator, heat the evaporator to control the temperature at 30°C to produce a mixture of carbonyl iron Gas, wherein the supply rate of carbonyl iron liquid is 0.25L / h, and the volume ratio of carbonyl iron liquid to inert gas containing oxygen is 1L:0.6m 3 , the volume ratio of oxygen and nitrogen in the inert gas containing oxygen is 1:12. (b) The mixed gas of carbonyl iron and the inert gas containing oxygen enter the reactor, and the flow rate of the mixed gas of carbonyl iron entering the reactor is 6m 3 / h, the volume ratio between the mixed gas of carbonyl iron and the inert gas containing oxygen is 1:5, and the volume of oxygen and nitrogen in the inert gas containing oxygen is 1:12. Heating the reactor so that the temperature of the middle and upper zone in the reactor is: 400°C, the ...

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Abstract

A method of utilizing carbonyl iron to produce high purity iron oxide comprises the following steps: (a) introducing a carbonyl iron liquid and inert gas containing oxygen into an evaporator, and heating the evaporator to control the temperature of the evaporator in a range of 25 to 30 DEG C to generate mixed gas of carbonyl iron; and (b) introducing the mixed gas of carbonyl iron and inert gas containing oxygen into a reactor, and heating the reactor to control the temperature of the reactor in a temperature of 250 to 520 DEG C so as to decompose the mixed gas of carbonyl iron in the reactorto obtain high purity iron oxide powder after 40 to 60 seconds. The method can obtain iron oxide powder with certain purity; the content of Fe<3+> is in a range of 65-68.66%, and the content of Fe<2+>is in a range of 0.2-0.3%. By burning carbonyl iron and excess oxygen, iron oxide is prepared, the powder is in a filament shape in a microscopic view; the method can prevent the side reactions thatgenerate carbon impurities, iron, cementite, and the like. High purity iron oxide powder with different contents of Fe<3+>, Fe<2+>, and carbon is obtained.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of high-purity iron oxide materials, and in particular relates to a method for producing high-purity iron oxide by using carbonyl iron. Background technique [0002] High-purity carbonyl iron powder is more and more widely used in various technical fields. It is used for high-grade fine grinding materials, used for polishing of precision hardware instruments, optical glass, etc. High-purity iron oxide is the main base material of powder metallurgy, which is used to smelt various magnetic alloys and other advanced alloy steels. The traditional method is obtained by calcining ferrous sulfate, ferric oxide yellow or scrap iron at high temperature, or directly from liquid medium, but the purity of ferric oxide needs to be improved, and the impurity content is not the same due to different processes. Therefore, it is a new development trend to prepare high-purity iron oxide by means of a n...

Claims

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Application Information

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IPC IPC(8): C01G49/06
CPCC01G49/06C01P2004/32C01P2006/80
Inventor 王永前肖冬明马国生王良罗世铭张华江林陈正乾李登瑞董伟陈旭军甄超兴
Owner JINCHUAN GROUP LIMITED
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