Method of producing iron oxide red using ferrous sulphate

A technology of iron oxide red and ferrous sulfate, applied in the direction of iron oxide, iron oxide/iron hydroxide, fibrous filler, etc., can solve the problems of high impurity content, poor product performance, poor product quality, etc., and achieve iron recovery rate High, good product quality, short reaction time effect

Active Publication Date: 2007-01-31
PANZHIHUA LIYU MINING
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If not handled properly, it will cause serious environmental pollution
[0003] At present, in addition to a small amount of by-product ferrous sulfate used as polyferric sulfate water purifier and feed additive, some of them use conventional direct calcination method or ammonium bicarbonate precipitation method to produce iron pigments (mainly iron red) and iron pigments. Iron oxide is used for oxygen body, but the product quality is poor, the impurity content is high, and the product performance is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Ammonia water with a concentration of 21% is added into a ferrous sulfate solution with an iron ion concentration of 100 g / L, and the pH of the prepared liquid solution is 8. At the same time, the autoclave starts to stir and heat up, and the stirring speed is 60 rpm. When the temperature reaches 160°C, the pressure is raised to 1.2MPa by introducing oxygen, and the above-mentioned prepared liquid is pumped into the autoclave for reaction, and the The stirring speed is adjusted to 300 rpm, and after a reaction time of 90 minutes, the iron oxide red is obtained after discharging, filtering, washing, drying and crushing, and the purity of the iron oxide red reaches more than 98.5%.

Embodiment 2

[0018] Ammonia water with a concentration of 18% is added into a ferrous sulfate solution with an iron ion concentration of 50 g / L, and the prepared liquid solution has a pH of 9. At the same time, the autoclave starts to stir and heat up, and the stirring speed is 60 rpm. When the temperature reaches 170°C, the pressure is raised to 1.8MPa by introducing oxygen, and the above prepared liquid is pumped into the autoclave for reaction, and The stirring speed was adjusted to 300 rpm, and after a reaction time of 120 minutes, the iron oxide red was obtained after discharging, filtering, washing, drying and crushing, and the purity of the iron oxide red reached more than 98.5%.

Embodiment 3

[0020] Ammonia water with a concentration of 25% is added into a ferrous sulfate solution with an iron ion concentration of 150 g / L, and the pH of the prepared liquid solution is 6. At the same time, the autoclave starts to stir and heat up, and the stirring speed is 60 rpm. When the temperature reaches 120°C, the pressure is raised to 1.6MPa by introducing oxygen, and the above prepared liquid is pumped into the autoclave for reaction, and the The stirring speed is adjusted to 300 rpm, and after a reaction time of 180 minutes, the product is obtained after discharging, filtering, washing, drying, crushing and packaging, and the purity of iron oxide red reaches more than 98.5%.

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Abstract

The present invention provides a method for producing iron oxide red by using ferrous sulfate. Said method includes the following steps: (1), placing ferrous sulfate and ammonia water into a reactor; (2), introducing oxygen gas to make oxidation reaction; (3), discharging material, filtering, washing, drying and pulverizing so as to obtain the iron oxide red.

Description

technical field [0001] The invention relates to a method for producing iron oxide red by using ferrous sulfate. Background technique [0002] In the production process of titanium dioxide factory, a large amount of ferrous sulfate will be produced, and every ton of titanium dioxide will be produced by-product ferrous sulfate (FeSO 4 ·7H 2 O) 3.5 to 4 tons. According to incomplete statistics, the by-product of ferrous sulfate in my country's titanium dioxide industry exceeds 1 million tons per year. If not handled properly, it will cause serious environmental pollution. [0003] At present, in addition to a small amount of by-product ferrous sulfate used as polyferric sulfate water purifier and feed additive, some of them use conventional direct calcination method or ammonium bicarbonate precipitation method to produce iron pigments (mainly iron red) and iron pigments. Iron oxide is used as oxygen body, but the product quality is poor, the impurity content is high, and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/06C09C1/24
Inventor 汪云华关晓伟何德武
Owner PANZHIHUA LIYU MINING
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