Treatment process and treatment system of circulating water for fine cooling of surface of cold-rolled silicon steel

Abstract

The invention relates to treatment process and a treatment system of circulating water for fine cooling of surface of cold-rolled silicon steel. The treatment process comprises the following steps: intermittently adding 0.1% of polyacrylamide used as a flocculant aid; mixing and flocculating; introducing the mixed and flocculated cooling water backwater into an inclined plate settler for settlement; introducing the settled water into an intermediate water tank, and then pumping to a filter through a pump for treatment; and introducing the filtered water to a cooler tower utilizing residual pressure for cooling treatment. The treatment system is characterized in that the bottom of a flocculant aid feeding device is connected with the upper part of a mixing and distributing tank through a feeding pump; the mixing and distributing tank is connected with the inclined plate settler; the inclined plate settler is connected with the upper part of the intermediate water tank; the lower part of the intermediate water tank is connected with the filter through a filter transfer pump; the filter is separately connected with a first-stage cooling tower and a second-stage cooling tower; the second-stage cooling tower is connected with a cooling circulating water supply pump; and the cooling circulating water supply pump is connected with the upper part of the mixing and distributing tank. The system provided by the invention has the advantages of saved occupation area, low one-time investment, stable treatment effect, low production and operation cost, high automatic operation degree and the like.

Description

technical field [0001] The invention belongs to the field of water treatment, and in particular relates to a cooling circulating water treatment process and system for finely cooling the surface of cold-rolled silicon steel. Background technique [0002] After the cold-rolled silicon steel is heated in the heating furnace, in order to make the subsequent processing of the silicon steel go on normally, it is necessary to use circulating water for fine cooling. The cold-rolled silicon steel treated by the heating furnace is difficult to meet the requirements of subsequent treatment due to the high surface temperature. At present, the conventional treatment process is to use the hot-rolled strip turbid circulating water treatment process, that is, the swirl type iron pit, the advection type Sedimentation tank, filtration, cooling, but the iron oxide scale produced by the cold-rolled strip steel after the heating furnace is essentially different from the iron oxide scale produce...

AI Technical Summary

Problems solved by technology

The cold-rolled silicon steel treated by the heating furnace is difficult to meet the requirements of subsequent treatment due to the high surface temperature. At present, the conventional treatment process is to use the hot-rolled strip turbid circulating water treatment process, that is, the swirl type iron pit, the advection type Sedimentation tank, filtration, cooling, but the iron oxide scale produced by the cold-rolled strip steel after the heating furnace is essentially different from the iron oxide scale produced by the hot-rolling mill. If the hot rolling turbid circulating water treatment process is used for fine cooling circulating water, there are disadvantages such as large floor space and high energy consumption

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