A device and method for reducing the concentration of emulsion in the last stand cold rolling mill

Abstract

The invention discloses a device and a method for reducing the emulsion concentration of a cold rolling mill at the end stand. The device includes a front stand emulsion cleaning tank group and an end stand emulsion cleaning tank. The device also includes a The fluid overflow in the frame emulsion cleaning tank is directed to the overflow pipe structure in the front frame emulsion cleaning tank group. By adopting this device, combined with the corresponding operation method, it is possible to conveniently and effectively reduce the concentration of the emulsion at the end stand to the required range without discharging the emulsion, and the operation is simple without using pumping power Consumption, investment and operating costs are low.

Description

technical field [0001] The invention belongs to the technical field of cold rolling of iron and steel metallurgy, and in particular relates to a device and a method for reducing the emulsion concentration of a cold rolling mill at the end stand. Background technique [0002] In the process of rolling and producing cold-rolled sheet in a cold tandem mill, an emulsion is used. Emulsion is a mixture of rolling oil stock solution and desalted water in a certain proportion, which is mainly composed of mineral oil and various additives. The concentration is the percentage of rolling oil in the total mixture. The emulsion plays the role of rolling lubrication, cooling and cleaning of the surface of cold-rolled strip steel during production. While satisfying the rolling process, the surface of the strip will also absorb a small amount of residual substances. As the residue increases, defects such as surface color difference, spots, and bonding may occur in subsequent processes (suc...

AI Technical Summary

Problems solved by technology

On the one hand, due to the entry of a large amount of desalinated water, the temperature of the system will drop, resulting in a decrease in the stability of the emulsion system and negative harm to product quality; on the other hand, during the concentration adjustment process, the concentration and temperature of the emulsion changes, directly affect the lubrication and cooling of the rolling process, and easily cause various production accidents

[0005] Especially for the 3# emulsion cleaning tank at the end of the service stand, due to the large supply of emulsion in the first few stands and the fast rolling speed, although the existing technology uses compressed air to blow and isolate it through large blowing to prevent emulsification liquid channeling in order to achieve the purpose of suppressing the concentration difference, but a small amount of the high-concentration emulsion before the last stand will still enter the last stand rolling mill along the rolling direction and flow into the No. 3 emulsion system, resulting in No. 3 emulsion The system concentration gradually increases and exceeds the required range, thereby reducing the cleaning effect on the steel strip surface and getting worse

The emulsion with excess concentration is forced to be discharged into the pit and then sent to the water treatment station for disposal, which not only wastes the emulsion resources, but also increases the pressure on the environmental protection facilities for subsequent disposal.

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