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Iron oxide red pigment and preparation method thereof

A technology of iron oxide red and pigment, which is applied in the field of preparation of low heavy metal full liquid phase method iron oxide red by titanium dioxide by-product ferrous sulfate, and achieves the effect of fine particles, saving iron resources and improving automation.

Active Publication Date: 2016-11-16
阳山景润陶瓷色料实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large amount of acidic wastewater will eventually be produced

Method used

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  • Iron oxide red pigment and preparation method thereof
  • Iron oxide red pigment and preparation method thereof
  • Iron oxide red pigment and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Get 300ml of refined ferrous sulfate, dilute it with water to a concentration of 1.0g / L, put it into a reactor equipped with an air device, add 0.02% dispersant propylene glycol and hydrogen peroxide, and quickly (complete within five minutes) add Use 32% liquid caustic soda to make the pH reach 9, and ventilate the air to maximize the air. The oxidation reaction takes 15 minutes until the color is brownish red, and iron red seed crystal solution is obtained.

[0027] Within 5 minutes, take the above-mentioned seed crystals and add them to the oxidation tank, adjust the pH value to about 5 with dilute sulfuric acid, add refined ferrous sulfate, heat up to 60°C with steam, and add about 10% concentrated alkali dropwise at the same time. Control the pH value between 2.5-3.0 until the material liquid hair gel turns into a yellow-red phase; at this time, raise the temperature to 80°C, continue to control the pH value between 3.5-4.5, oxidize for 16 hours, and reach the ideal...

Embodiment 2

[0031] Get refined ferrous sulfate 300ml. Dilute to a concentration of 0.4g / L and put it into a reactor equipped with air, add 0.02% dispersant propylene glycol and hydrogen peroxide, quickly add 32% liquid caustic soda to pH 10, and ventilate to maximize the air to oxidize the seed crystal quickly, and the oxidation reaction lasted for 20 minutes until the color was brownish red, and the iron red seed crystal solution was obtained.

[0032] Take the above-mentioned seed crystals and add them to the oxidation tank within 5 minutes, adjust the pH to about 6 with dilute sulfuric acid, add a certain amount of refined ferrous sulfate, raise the temperature to 60°C, and add about 10% concentrated alkali dropwise to control the pH at the same time. Between 2.5-3.0, until the material liquid hair gel turns into a yellow-red phase; at this time, raise the temperature to 85°C, continue to control the pH between 3.5-4.5, oxidize for 16-30 hours, and reach the ideal color, put it in a bu...

Embodiment 3

[0036] Get 300ml of refined ferrous sulfate, dilute to a concentration of 0.5g / L and put it into a reactor equipped with air loading, add 0.02% dispersant propylene glycol and hydrogen peroxide, add quickly with 32% liquid caustic soda to make the pH reach 11, The air was ventilated to maximize the air, and the reaction was carried out for 25 minutes until the color was brownish red to obtain an iron red seed crystal solution.

[0037] Take the above-mentioned seed crystals and add them to the oxidation tank within 5 minutes, adjust the pH to about 7 with dilute sulfuric acid, add a certain amount of refined ferrous sulfate, raise the temperature to 60°C, and add about 10% concentrated alkali dropwise to keep the concentration of the material. The pH is between 2.5-3.0, until the material liquid hair gel turns into a yellow-red phase; at this time, the temperature is raised to 80°C, and the pH is continued to be controlled between 3.5-4.5, and the oxidation reaction takes 16-30...

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Abstract

The invention discloses an iron oxide red pigment and a preparation method thereof. The preparation method comprises the specific steps that 1, acidic waste water generated after production of titanium dioxide pigments or acidic waste water in an iron and steel plant is adopted for preparing a ferrous sulfate solution; 2, the ferrous sulfate solution is diluted with water, a dispersion agent and caustic soda liquid are added, air is introduced, air is maximized, the pH value of the feed liquid is controlled to range from 9 to 12, an oxidizing reaction is carried out till the color is brownish red, and an iron oxide red seed crystal solution is prepared; 3, the iron oxide red seed crystal solution is added, the pH value is adjusted to range from 5 to 8, the ferrous sulfate solution is added, heating is carried out, air is introduced, when the temperature ranges from 60 DEG C to 80 DEG C, the caustic soda liquid is continuously and evenly added into a reactor dropwise, the pH value is controlled to range from 2.5 to 3.5 till the feed liquid is fermented into a yellowish red phase, the temperature is controlled to range from 80 DEG C to 85 DEG C at this moment, the pH value is controlled to range from 3.5 to 4.5, the oxidizing reaction is carried out for 16-30 hours, and the iron oxide red pigment is prepared. The method is environmentally friendly, and the product is fine and even in particle and bright in color.

Description

technical field [0001] The invention relates to a method for preparing iron oxide red, in particular to a method for preparing iron oxide red by a low-heavy-metal full-liquid phase method using ferrous sulfate as a by-product of titanium dioxide. Background technique [0002] Ferric oxide red chemical name Fe 2 o 3 , also known as iron oxide red, is used for various paint coloring and protective substances. There are many methods for producing iron oxide red at home and abroad. All iron oxide reds will have more or less heavy metals. And the iron oxide red produced by this method is low heavy metal full liquid phase method iron oxide red, is applicable to medicine, cosmetics, food, toy. The color changes from red-yellow phase to blue-purple phase. The relative density of the product produced by this method is between 4.80-5.20, the hiding power is less than 7G / M2, the light resistance reaches level 8, and its heat resistance can reach 1200. Chemical resistance It is inso...

Claims

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Application Information

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IPC IPC(8): C01G49/06
CPCC01G49/06
Inventor 高顺强廖金华冯仕元
Owner 阳山景润陶瓷色料实业有限公司
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