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Method for producing high-performance iron oxide red from hydrothermal ultra-fine grains

A technology of iron oxide red and ultra-fine crystals, which is applied in the direction of iron oxide, iron oxide/iron hydroxide, etc., can solve the problems of long process for treating ammonia nitrogen in the filtrate, high equipment performance requirements, and high recovery costs, and meet the production equipment performance requirements. High, good quality, cost-saving effect

Active Publication Date: 2017-02-22
CNMC GUANGXI PGMA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The invention patent of publication number CN105129866A applied for a method for producing iron oxide red by ferrous sulfate hydrothermal method. This process takes a long time to prepare seed crystals. The second-step oxidation adopts high-pressure and high-temperature hydrothermal method to prepare iron oxide red, which requires high equipment performance. The cost is high, the process of treating the filtrate ammonia nitrogen is long and the recovery cost is high

Method used

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  • Method for producing high-performance iron oxide red from hydrothermal ultra-fine grains

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Step 1. Take 600 parts of water and stir in parts by weight, mix 1 part of phosphoric acid and 100 parts of ferrous sulfate heptahydrate to obtain a first mixed liquid, and adjust the pH of the first mixed liquid to 1 with sulfuric acid ;

[0036] Step two, continue to stir, add 21 parts of hydrogen peroxide in parts by weight, at this time the potassium ferricyanide detector detects Fe 2+ Complete oxidation

[0037] Step 3: Heat the temperature to 70°C, add 1 part of lime slurry in parts by weight, and obtain the slurry after stirring, and adjust the pH of the slurry to 3 with liquid caustic soda;

[0038] Step 4. Air is blown into the slurry, after stirring, rinse with water until there is no SO4 in the supernatant of the slurry 2- ;

[0039] Step 5: Perform two-step oxidation on the rinsed slurry, then rinse, dry, and crush to obtain high-performance iron oxide red.

Embodiment 2

[0041] Step 1. Take 1000 parts of water and stir in parts by weight, mix 5 parts of phosphoric acid and 100 parts of ferrous sulfate heptahydrate to obtain a first mixed liquid, and adjust the pH of the first mixed liquid to 3.5 with sulfuric acid ;

[0042] Step two, continue to stir, add 40 parts of hydrogen peroxide in parts by weight, at this time the potassium ferricyanide detector detects Fe 2+ Complete oxidation

[0043] Step 3. The temperature is raised to 90°C, and 10 parts of lime slurry is added in parts by weight, the slurry is obtained after stirring, and the pH of the slurry is adjusted to 4 with liquid caustic soda;

[0044] Step 4. Air is blown into the slurry, after stirring, rinse with water until there is no SO4 in the supernatant of the slurry 2- ;

[0045] Step 5: Perform two-step oxidation on the rinsed slurry, then rinse, dry, and crush to obtain high-performance iron oxide red.

Embodiment 3

[0047] Step 1. Take 800 parts of water and stir in parts by weight, mix 2 parts of phosphoric acid and 100 parts of ferrous sulfate heptahydrate to obtain a first mixed liquid, and adjust the pH of the first mixed liquid to 2 with sulfuric acid ;

[0048] Step two, continue to stir, add 30 parts of hydrogen peroxide in parts by weight, at this time the potassium ferricyanide detector detects Fe 2+ Complete oxidation

[0049] Step 3. The temperature is increased to 75°C, and 5 parts of lime slurry is added in parts by weight, the slurry is obtained after stirring, and the pH of the slurry is adjusted to 3 with liquid caustic soda;

[0050] Step 4. Air is blown into the slurry, after stirring, rinse with water until there is no SO4 in the supernatant of the slurry 2- ;

[0051] Step 5: Perform two-step oxidation on the rinsed slurry, then rinse, dry, and crush to obtain high-performance iron oxide red.

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Abstract

The invention discloses a method for producing high-performance iron oxide red from hydrothermal ultra-fine grains. The method comprises the following steps: (based on parts by weight), fetching 600-1000 parts of water, stirring, mixing 1-5 parts of phosphoric acid with 100 parts of ferrous sulfate heptahydrate to obtain a first mixed solution, and regulating the pH value of the first mixed solution to 1-3.5 with sulfuric acid; continuing to stir, adding 21-40 parts of hydrogen peroxide until Fe<2+> is completely oxidized; heating to 70-90 DEG C, adding 1-10 parts of lime slurry, stirring to obtain slurry, and regulating the pH value of the slurry to 3-4 with liquid alkali; introducing air into the slurry, stirring, rinsing until no SO4<2> exists in supernate of the slurry with water; carrying out secondary oxidization on the rinsed slurry, rinsing, drying, and grinding, so as to obtain the high-performance iron oxide red. By virtue of the method, the uniform and stable grains with ultra-fine particle sizes can be prepared, the Fe2O3 content of the prepared iron oxide red is above 95.5%, and the tinting strength of the prepared iron oxide red is above 101%.

Description

Technical field [0001] The present invention relates to a production method of iron oxide red pigment. More specifically, the present invention relates to a method for producing high-performance iron oxide red from hydrothermal ultra-fine seeds. Background technique [0002] In my country, the process of producing iron oxide red is generally divided into dry method and wet method. Among them, the color performance of iron oxide red prepared by dry method is worse than that of wet method. For the wet preparation of iron oxide red, there are mainly sulfuric acid method, nitric acid method and mixed acid method. From the aspect of pigment quality, the nitric acid method is better than the mixed acid method, and the mixed acid method is better than the sulfuric acid method. However, the sulfuric acid process has a wide range of sources of raw materials, low production costs, and the working environment is far superior to the other two. This is the main reason why the sulfuric acid ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/06
CPCC01G49/06C01P2004/62C01P2006/60C01P2006/80
Inventor 林秋萍
Owner CNMC GUANGXI PGMA