Silicon steel sulfuric acid refining system cleaning process

Abstract

The invention relates to a cleaning process of a cold-rolled silicon steel acid cleaning system, which is the supplementary of the circulatory system of the total acid cleaning process and cleans the heater and the total system with hot natrium hydroxydatum solution. The invention can heat with self-heating system and adjust the temperature of the cleaning liquid and the circulatory time according to the cleaning effect. The total acid cleaning system can clean according to the actual operation condition; the graphite heater which is clogged easily can be cleaned completely on the line in order to reduce the accident. The invention can improve the operation reliability of the system, which reduces the discharging of the waste water, and doesn't pollute the environment.

Description

(1) Technical field [0001] The invention relates to a cleaning process for a cold-rolled silicon steel pickling system. (2) Background technology [0002] At present, most of the existing silicon steel pickling units are deep tank pickling, and the application of shallow tank pickling has been developed in recent years. Deep tank pickling is a technology of immersing strip steel in hydrochloric acid for cleaning. There is no circulation system in the whole acid tank, and heating, acid replenishment, and acid discharge are all carried out directly through the acid tank. After a period of production, the bottom of the acid tank is A certain amount of silica mud will be deposited. Therefore, the deep tank pickling unit needs to stop production to remove the silica mud in the acid tank after running for a period of time. According to the available data, it generally takes three days to remove silica mud. The cleaned-up silica mud causes great pollution to the pickling plant, ...

AI Technical Summary

Problems solved by technology

However, although the shallow tank turbulent flow pickling technology has optimized the device and equipped with a silicon sludge removal system, it is limited by the processing capacity. The silicon sludge is in the circulation pipeline of turbulent flow pickling, especially in the external heater. Still clogging, accumulating in acid tanks, pipes, and spray beams

For shallow tank pickling equipment such as pipelines, heaters, acid tanks, and spray beams, except for the heaters, which can be cleaned at the heater manufacturer, other equipment is cleaned on site, some using HF acid for cleaning, and some Use hot alkali to clean, and the cleaned silica mud, residual acid and residual alkali are directly discharged into the ditch, causing secondary pollution to the sewage discharge system

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