System for cleaning surface of strip steel through hot-water circulation

Abstract

The invention discloses a method and a system for cleaning the surface of strip steel through hot-water circulation, wherein the surface of the strip steel is subjected to alkali scrubbing, electrolytic cleaning and hot-water poaching; before carrying out the alkali scrubbing on the surface of the strip steel, the two surfaces of the strip steel are sprayed and cleaned at the pressure of 8-12 MPa by using spraying and cleaning hot water through a pressure-stabilizing and pressure-accumulating tank; the temperature of the spraying and cleaning hot water is 40-70 DEG C; the waste water after the hot-water poaching enters a buffer tank; the waste water for spraying and cleaning the surface of the strip steel enters the buffer tank; after being filtered, water in the buffer tank enters a water storage tank; and the water in the water storage tank forms the spraying and cleaning hot water. According to the method disclosed by the invention, all factors by using the hot-water spraying and cleaning and the hot-water circulation are comprehensively considered; the optimization of a process for cleaning and degreasing the surface of the strip steel is realized; the equipment combination number of the subsequent alkali scrubbing and the electrolytic process section and the energy consumption are reduced by more than 40%; and the purposes of saving energy and reducing consumption are achieved.

Description

technical field [0001] The invention belongs to the strip steel surface treatment technology after cold rolling, in particular to a strip steel surface cleaning and degreasing technology after cold rolling. Background technique [0002] After pickling and cold rolling, a layer of dense film structure will be firmly adhered to the surface of the strip steel. Formed under a large rolling force of 600-1000 tons. According to the inspection statistics, the residual rolling oil on the surface of the steel plate off-line from the cold rolling line is 400-450 mg / m 2 (Single side), the amount of residual iron powder on the surface is 200~250mg / m 2 (one-sided). The rolling oil and iron powder remaining on the surface of the strip cannot be eliminated in the subsequent bright annealing process of recrystallization, but will form carbides and free iron powder respectively due to reduction and adhere to the surface of the strip, which will easily cause the strip to Defects such as r...

AI Technical Summary

Problems solved by technology

Although this technology can adapt to high-speed production requirements, its power consumption is more than 10 times that of traditional technology, and the cost is high, the equipment is sophisticated, and the maintenance requirements are high.

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