The invention provides a method for treating acidic iron-containing wastewater generated by a rusting and rinsing process in the production and processing of fasteners. The main steps of the present invention are as follows: (1) adjusting the pH of the acidic iron-containing wastewater to 4.0~4.5; 2 adding a nitrite catalyst and an additive to the reaction tank, and controlling the concentration of the nitrite catalyst in the reaction tank at 0.0005 mol/L. ~0.0015mol / L, after standing, continue to oxygen into the reaction tank, stirring reaction for 7 to 10 hours, then stop, control the pH of the reaction solution in the reaction process is 3.0 ~ 4.5, and maintain the gas circulation in the reaction tank; 3 After standing, the precipitate is dried to obtain an iron yellow pigment. The treatment effect of the invention is that the pH value of the discharged water is 6-8, the iron concentration is less than 2 mg/L, and the total nitrogen is less than 20 mg/L, which is in line with national emission standards. After the sale of the by-product iron yellow pigment, the cost of removing the acidic iron-containing wastewater can be profitable.
The surface of mounting sample is not smooth. Grinding is to remove excess part of the sample with abrasive materials.
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