Clean synthesis method of iron oxide red pigment with low oil absorption

A technology of iron oxide red and synthesis method, applied in the directions of iron oxide, iron oxide/iron hydroxide, etc., can solve problems such as high cost

Active Publication Date: 2021-09-14
SHENGHUA GROUP DEQING HUAYUAN PIGMENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to statistics, each ton of iron red pigment products uses 20 tons of water, and the concentration of ammonia nitrogen in wastewater before treatment reaches about 1500ppm, resulting in high costs for the subsequent ammonia nitrogen treatment of production enterprises

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Weigh 30g FeSO4 7H2O, 0.4g EDTA and 1.5g NaCl into a 1000mL large beaker with an electronic balance, then add 450mL deionized water to dissolve to form solution A, then add 22mL 30wt.% NaOH solution B under stirring , and then use an air pump to blow oxygen into the beaker to ensure that the precipitate in the beaker is evenly oxidized, and then add 30wt.% NaOH solution dropwise during the oxygen flow process to keep the pH value of the reaction solution between 6.5 and 6.8, until the suspension in the beaker is completely dark green. After it turns orange-yellow and the pH value is no longer lowered, stop blowing oxygen and make a primary seed crystal of γ-FeOOH;

[0030] Weigh 0.5g FeSO4·7H2O and dissolve it in 20mL deionized water to make FeSO4·7H2O solution, heat the γ-FeOOH primary seed suspension on an electric furnace, and add the prepared FeSO4 solution into the boiling liquid after the suspension boils , continued to heat and boil for 1.5 hours, and obtained ir...

Embodiment 2

[0033] Weigh 30g FeSO4 7H2O, 0.4g EDTA and 1.5g NaCl into a 1000mL large beaker with an electronic balance, then add 450mL deionized water to dissolve to form solution A, then add 22mL 30wt.% NaOH solution B under stirring , and then use an air pump to blow oxygen into the beaker to ensure that the precipitate in the beaker is evenly oxidized, and then add 30wt.% NaOH solution dropwise during the oxygen flow process to keep the pH value of the reaction solution between 6.5 and 6.8, until the suspension in the beaker is completely dark green. After it turns orange-yellow and the pH value is no longer lowered, stop blowing oxygen and make a primary seed crystal of γ-FeOOH;

[0034] Add 150mL of solution A to the primary seed crystal of γ-FeOOH, then add 7.3mL of solution B under stirring, then blow oxygen into the cup with an air pump to ensure uniform oxidation of the precipitate in the cup, and then add 30wt.% NaOH solution dropwise during the oxygen flow process to make The p...

Embodiment 3

[0038]Weigh 30g FeSO4 7H2O, 0.4g EDTA and 1.5g NaCl into a 1000mL large beaker with an electronic balance, then add 450mL deionized water to dissolve to form solution A, then add 22mL 30wt.% NaOH solution B under stirring , and then use an air pump to blow oxygen into the beaker to ensure that the precipitate in the beaker is evenly oxidized, and then add 30wt.% NaOH solution dropwise during the oxygen flow process to keep the pH value of the reaction solution between 6.5 and 6.8, until the suspension in the beaker is completely dark green. After it turns orange-yellow and the pH value is no longer lowered, stop blowing oxygen and make a primary seed crystal of γ-FeOOH;

[0039] Add 150mL of solution A to the primary seed crystal of γ-FeOOH, then add 7.3mL of solution B under stirring, then blow oxygen into the cup with an air pump to ensure uniform oxidation of the precipitate in the cup, and then add 30wt.% NaOH solution dropwise during the oxygen flow process to make The pH...

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PUM

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Abstract

The invention provides a clean synthesis method of an iron oxide red pigment with low oil absorption. The method comprises the following steps: 1, preparation: adding 30-50 parts of FeSO4.7H2O into an auxiliary agent, and dissolving to prepare a solution A; 2, primary crystallization: mixing the solution A obtained in the step 1 with a NaOH solution B, and then precipitating and uniformly oxidizing to prepare gamma-FeOOH primary seed crystal; 3, secondary crystallization: adding the gamma-FeOOH primary seed crystal suspension prepared in the step 2 into the solution A in the step 1, stirring and oxidizing, and adding a NaOH solution B to prepare gamma-FeOOH secondary seed crystal; 4, tertiary crystallization: adding the gamma-FeOOH secondary seed crystal obtained in the step 3 into the solution A obtained in the step 1, adding a NaOH solution B at the same time, and stirring and oxidizing to obtain gamma-FeOOH tertiary seed crystal; and 5, preparation of a finished product of iron oxide red: preparing a FeSO4.7H2O solution, heating the gamma-FeOOH tertiary seed crystal suspension obtained in the step 4, then adding the FeSO4.7H2O solution, heating, and carrying out suction filtration, washing, drying and grinding to obtain the finished product of iron oxide red.

Description

technical field [0001] The invention relates to a clean synthesis method of iron oxide red pigment with low oil absorption. Background technique [0002] In recent years, my country's inorganic pigment industry has developed rapidly. Among all kinds of pigments, iron oxide pigments have become the largest color inorganic pigments. The amount of waste water in the production process of iron oxide products is large, especially the mixed acid method (nitric acid-sulfuric acid) is used in the production process of iron red pigments, which will produce high-concentration ammonia nitrogen waste water. The waste water volume fluctuates greatly, the concentration of NH3-N is high, and the treatment is difficult It is one of the factors leading to the eutrophication of closed water bodies and one of the pollutants strictly controlled by the state. According to statistics, 20 tons of water is used for each ton of iron red pigment products, and the concentration of ammonia nitrogen in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/06
CPCC01G49/06C01P2006/19Y02P20/10
Inventor 潘国祥沈辉徐敏虹李金花竺增林郭玉华青木功荘
Owner SHENGHUA GROUP DEQING HUAYUAN PIGMENT
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