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Method for producing high-performance iron oxide red with hydrothermal ultra-fine crystal seeds

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 cost, and meet the production equipment performance requirements. High, good quality, cost-saving effect

Active Publication Date: 2018-02-06
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 with hydrothermal ultra-fine crystal seeds

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0036] Step 2, continue to stir, add 21 parts of hydrogen peroxide in parts by weight, at this moment, potassium ferricyanide detector detects Fe 2+ fully oxidized;

[0037] Step 3, heat up to 70°C, add 1 part of lime slurry in parts by weight, stir to obtain the slurry, adjust the pH value of the slurry to 3 with liquid caustic soda;

[0038] Step 4, feed air into the slurry, rinse with water after stirring until there is no SO in the supernatant of the slurry 2- ;

[0039] Step 5, performing two-step oxidation on the rinsed slurry, then rinsing, drying, and crushing to obtain high-performance iron oxide red.

Embodiment 2

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

[0042] Step 2, continue to stir, add 40 parts of hydrogen peroxide in parts by weight, at this time, the potassium ferricyanide detection agent detects Fe 2+ fully oxidized;

[0043] Step 3, heat up to 90°C, add 10 parts of lime slurry in parts by weight, stir to obtain the slurry, adjust the pH value of the slurry to 4 with liquid caustic soda;

[0044] Step 4, feed air into the slurry, rinse with water after stirring until there is no SO in the supernatant of the slurry 2- ;

[0045] Step 5, performing two-step oxidation on the rinsed slurry, then rinsing, drying, and crushing to obtain high-performance iron oxide red.

Embodiment 3

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

[0048] Step 2, continue to stir, add 30 parts of hydrogen peroxide in parts by weight, at this time, the potassium ferricyanide detection agent detects Fe 2+ fully oxidized;

[0049] Step 3, heat up to 75°C, add 5 parts of lime slurry in parts by weight, stir to obtain the slurry, adjust the pH value of the slurry to 3 with liquid caustic soda;

[0050] Step 4, feed air into the slurry, rinse with water after stirring until there is no SO in the supernatant of the slurry 2- ;

[0051] Step 5, performing two-step oxidation on the rinsed slurry, then rinsing, drying, and crushing 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 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 with hydrothermal ultrafine seeds. Background technique [0002] In my country, the production process of 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 preparation of iron oxide red by wet method, there are mainly sulfuric acid method, nitric acid method and mixed acid method. In terms of the quality of the pigment, 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 method has a wide source 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 Patents(China)
IPC IPC(8): C01G49/06
CPCC01G49/06C01P2004/62C01P2006/60C01P2006/80
Inventor 林秋萍
Owner CNMC GUANGXI PGMA
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