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...

Examples

Embodiment Construction

[0011] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0012] When this method is implemented specifically, the figure 1 device shown, as figure 1 As shown, a method for supplying hydrochloric acid for pickling in a steel rolling production line is characterized in that a plurality of hydrochloric acid containers 1 are arranged side by side, and the bottom of each hydrochloric acid container 1 is connected to each other by a first connecting pipe 2 and is supplied through a supply pipe 3. The pump 4 is connected to the production line pipeline 5 for pickling supply; the upper ends of the above-mentioned multiple hydrochloric acid containers 1 are connected to each other through the second communication pipeline 6 and then connected to the hydrochloric acid truck storage tank through the supply pipeline 7 through the new acid supply pump 8 to carry out hydrochloric acid replenishment; The...

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...

Examples

Embodiment Construction

[0011] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0012] When this method is implemented specifically, the figure 1 device shown, as figure 1 As shown, a method for supplying hydrochloric acid for pickling in a steel rolling production line is characterized in that a plurality of hydrochloric acid containers 1 are arranged side by side, and the bottom of each hydrochloric acid container 1 is connected to each other by a first connecting pipe 2 and is supplied through a supply pipe 3. The pump 4 is connected to the production line pipeline 5 for pickling supply; the upper ends of the above-mentioned multiple hydrochloric acid containers 1 are connected to each other through the second communication pipeline 6 and then connected to the hydrochloric acid truck storage tank through the supply pipeline 7 through the new acid supply pump 8 to carry out hydrochloric acid replenishment; The...

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