Preparation technology of transparent iron oxide yellow pigment
A technology of transparent iron oxide yellow and preparation process, applied in the field of preparation of transparent iron oxide yellow pigment, can solve the problems of reduced production efficiency, easy agglomeration, difficult to control product quality and the like, and achieves reduced production cost, high transparency and high yield Effect
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[0020] The present invention proposes a kind of preparation technology of transparent iron oxide yellow pigment, comprises the following steps:
[0021] S1. Add a certain proportion of dispersant to the 0.5mol / L-3.0mol / L ferrous sulfate solution, and adjust the pH to 2.1-2.5 with dilute sulfuric acid to form the first solution;
[0022] S2. Under the condition that the stirring speed is 400-600r / min, slowly add the first solution to the alkaline solution with a pH of 9-11 to form ferrous salt precipitation and the second solution. During the addition, control the reaction temperature at Between 15-25°C, supplemented by stirring at a certain stirring speed, at the end of the precipitation reaction, the pH of the second solution is 7-8;
[0023] S3. Under the condition that the stirring speed is 200-300r / min, pass air into the second solution to oxidize for 1-2 hours to form the third solution. The air intake speed is 300-700L / h. The pH of the three solutions is <4.5;
[0024]...
Embodiment 1
[0032] Add tartaric acid as a dispersant to 1.5 mol / L ferrous sulfate solution, the molar ratio of tartaric acid and ferrous sulfate is 1.5:100, adjust the pH to 2.5 with dilute sulfuric acid to form the first solution. Slowly add the first solution to the lye (mixed solution of sodium carbonate and sodium bicarbonate) with pH = 10.7 to form ferrous salt precipitate and the second solution. During the addition, control the reaction temperature to 18°C, supplemented by The stirring speed was 450 r / min, and the pH of the second solution was 7.2 at the end of the reaction. After the precipitation reaction, at a stirring speed of 250r / min, air was oxidized into the second solution for 2 hours to form a third solution. The air feeding speed was 450 liters / hour, and the pH of the third solution at the end point was 4.4. The third solution is heated to a constant temperature of 100°C at a rate of 1°C / min, and an oxidant is added to form a fourth solution. After the oxidant is added, ...
Embodiment 2
[0034] Add sodium hexametaphosphate and zinc sulfate to the 3.0mol / L ferrous sulfate solution as a dispersant, the molar ratio of sodium hexametaphosphate, zinc sulfate and ferrous sulfate is 0.75:1.75:100, adjust pH=2.4 with dilute sulfuric acid A first solution is formed. Slowly add the first solution to the lye (mixed solution of sodium carbonate and sodium bicarbonate) with pH = 11 to form ferrous salt precipitation and the second solution. During the addition, control the reaction temperature to 25 ° C, supplemented by The stirring speed is 400 r / min, and the pH of the second solution at the end of the reaction is 7.1. After the precipitation reaction, at a stirring speed of 200r / min, air was oxidized into the second solution for 2 hours to form a third solution. The air feeding speed was 400 liters / hour, and the pH of the third solution at the end point was 4.4. The third solution was heated to a constant temperature of 95°C at a rate of 1.2°C / min, and an oxidant was ad...
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