Technology of purifying metallurgical industry wastewater

Abstract

The invention discloses a technology of purifying metallurgical industry wastewater. The technology comprises the following steps: adding bivalent iron salt at normal temperature; adjusting pH; stirring to generate a MeO.Fe2O3-Fe3O4 solid solution shown in the description. Since metal ions in the wastewater enter the crystal lattice of the solid solution, the suspended solids are adsorbed and coated to form ferrite sediment, and thus the wastewater is purified. A polar surfactant and hydrocarbon oil or water are added into the sediment for surface treatment so that the particles are transferred into an oil phase or water phase to form ferromagnetic fluid. The raw materials are cheap and easily available, the energy consumption is low, the period is short, and waste residue is avoided. The obtained magnetic fluid is easy to magnetize, hard to saturate and free of residual magnetism, and thus is suitable for treating magnetism wastewater.

Description

technical field [0001] The invention relates to a process for purifying metallurgical industrial wastewater. Background technique [0002] In the prior art, ferrite is used to purify metallurgical industrial wastewater by adding divalent and trivalent iron salts under alkaline high temperature to produce ferrite to purify metallurgical industrial wastewater. The disadvantage of using this method is that the purification of metallurgical industrial wastewater needs to be carried out at high temperature, which requires a lot of energy: adding divalent and ferric iron salts, the cost is high; the purification speed is slow and the purification cycle is long; the generated ferrite waste residue has no It is only used for stockpiling, and the continuous increase of sediment takes up a lot of space, and improper storage will cause secondary pollution. [0003] Therefore, it is of great practical significance to improve the shortcomings of the appeal and study a method that can pu...

AI Technical Summary

Problems solved by technology

The disadvantage of using this method is that the purification of metallurgical industrial wastewater needs to be carried out at high temperature, which requires a lot of energy: adding divalent and ferric iron salts, the cost is high; the purification speed is slow and the purification cycle is long; the generated ferrite waste residue has no Use, only for stockpiling, the continuous increase of sediment takes up a lot of space, improper storage will cause secondary pollution