Silicon steel magnesium oxide wastewater treatment method

Abstract

The invention discloses a silicon steel magnesium oxide wastewater treatment method, which comprises the following steps: homogenization treatment and primary filtration are sequentially carried out on magnesium oxide wastewater generated in a silicon steel scrubbing section, wherein the primary filtration is membrane filtration, and the pore diameter of the membrane is 1-10 microns; the magnesiumoxide wastewater subjected to primary filtration, alkali liquor and a flocculant solution are mixed, and a coagulant aid solution is added to obtain a mixed solution; the mixed solution is precipitated, supernatant is taken, and secondary filtration is carried out; and the mixed solution subjected to secondary filtration is mixed with a scale inhibitor to obtain reuse water. When the method is used for treating the silicon steel magnesium oxide wastewater, suspended solids in the magnesium oxide wastewater can be removed, reuse water is sent back to the silicon steel scrubbing section to be reused, and the problems that the surface of strip steel cannot be brushed cleanly and the quality of the strip steel is influenced due to the fact that the suspended solids in the reused water block aspray pipe are solved. And meanwhile, rinsing water and rinsing water heating steam consumption of the silicon steel CT unit are greatly saved, and wastewater discharge is reduced.

Description

technical field [0001] The invention belongs to the technical field of iron and steel environmental protection, and in particular relates to a treatment method for silicon steel magnesium oxide wastewater. Background technique [0002] Cold-rolled ordinary grain-oriented silicon steel is a high value-added and deep-processed product of iron and steel enterprises. In order to improve the electromagnetic properties and prevent the bonding problem caused by annealing of grain-oriented silicon steel, it is necessary to coat the surface of grain-oriented silicon steel with a magnesium oxide coating. During the formation of the magnesia coating, there will always be a small amount of magnesia solids remaining on the surface of the oriented silicon steel. Before entering the next step of the insulating coating, these residual magnesia solid powders must be cleaned with hot water. Conventional magnesia brushing Most of the sections are 1# scrubbing section, sulfuric acid pickling sp...

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Problems solved by technology

[0005] Aiming at the deficiencies of the above-mentioned prior art, the present invention provides a method for treating silicon steel magnesia wastewater to solve the problem that the magnesia wastewater in the p

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