Method for replenishing hydrochloric acid for acid washing on rolled steel production line

Abstract

The invention discloses a method for replenishing hydrochloric acid for acid washing on a rolled steel production line, which is characterized in that the upper ends of a plurality of hydrochloric acid containers are communicated through pipelines and connected to a water solution of an acid mist collecting tank through a collecting pipeline; the collecting pipeline is provided with a pressure sensor for detecting the air pressure in the collecting pipeline, and a by-pass pipe for replenishing air, so that one end of the by-pass pipe far from the collecting pipeline is communicated with the atmosphere; the by-pass pipe is provided with an electric ball valve; and the pressure sensor is utilized to control the electric ball valve, so that the air pressure in the hydrochloric acid containers can be kept normal in the fresh acid replenishment process and the acid washing hydrochloric acid production supply process. The method has the advantages of low implementation cost, practical and reliable effect and the like, and is convenient and simple to implement; and since the hydrochloric acid is recycled, the loss is lowered, and thus, the invention has favorable economic benefit and environmental benefit if being used for a long time.

Description

technical field [0001] The invention relates to a cold rolling production line of an iron and steel enterprise, in particular to a method for supplying hydrochloric acid for pickling of a steel rolling production line. Background technique [0002] In the rolling mill, the rolled steel needs to go through a pickling step in the rolling process. In this step, it is necessary to use hydrochloric acid to remove dirt and iron scale on the steel surface and to treat the steel surface to improve product performance. Hydrochloric acid is generally stored in plastic container storage tanks made of PPH. Concentrated hydrochloric acid is highly corrosive and volatile, and can easily pollute surrounding people, buildings, plants, and the air. Metals, in particular, are prone to corrosion and rust when exposed to hydrochloric acid. In the past, the cold-rolled hydrochloric acid storage tanks were all open containers, and a large amount of hydrochloric acid mist was volatilized from th...

AI Technical Summary

Problems solved by technology

In this way, the hydrochloric acid container is a closed container, and its upper part is a mixture of hydrogen chloride gas and air volatilized by concentrated hydrochloric acid. When new hydrochloric acid is purchased from the factory, it needs to be stored in the container for production needs. The pump pumps the hydrochloric acid in the storage tank of the hydrochloric acid truck into the hydrochloric acid container. At this time, because the container is airtight, as the liquid level in the container rises, the mixed gas in the upper part of the container is compressed. If the pressure continues to rise, the container is easy to Deformation under pressure, while increasing the operating load of the pump

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