Process for preparing black iron oxide by utilizing wastewater generated in production of chlorinated benzene

[0032] Such as figure 1 Shown:

[0033] Utilize the waste water produced by chlorinated benzene to prepare the technique of iron oxide black, concrete steps are as follows:

[0034] (1) Waste acid water feeding: check the liquid level of washing waste water tank 1, and feed waste acid water into titanium reactor 3. When the liquid level reaches 70% of the volume of reactor 3, stop feeding waste acid water and open the steam valve , the steam pressure is controlled at 0.1 MPa, and the stirring speed is controlled at 80 r / min to stir at a constant speed;

[0035] (2) Add reducing agent: when the reaction temperature reaches 60 °C, close the steam valve, add reducing agent 4 according to the molar ratio of ferric ion and reducing agent in the solution is 1.5:1, reducing agent 4 is reduced iron powder, when the solution When the color changes from light yellow to yellow-green, it can be considered that the reduced iron powder is completely dissolved. At this time, the Fe in the ...

[0041] Such as figure 1 Shown:

[0042] Utilize the waste water produced by chlorinated benzene to prepare the technique of iron oxide black, concrete steps are as follows:

[0043] (1) Feed waste acid water: check the liquid level of washing waste water tank 1, feed waste acid water into titanium reactor 3, stop feeding waste acid water when the liquid level reaches 80% of the volume of reactor 3, and open the steam valve , the steam pressure is controlled at 0.2 MPa, and the stirring speed is controlled to rotate and stir at a rotating speed of 50 r / min;

[0044] (2) Add reducing agent: when the reaction temperature reaches 80 °C, close the steam valve, add reducing agent 4 according to the molar ratio of ferric ion and reducing agent in the solution is 2.5:1, reducing agent 4 is reduced iron powder, when the solution When the color changes from light yellow to yellow-green, it can be considered that the reduced iron powder is completely dissolved. At this time, the Fe in ...