CONTINUOUS PICKLING METHOD AND CONTINUOUS PICKLING DEVICE

摘要

A pickling line control device (24) calculates forecast acid amounts consumed at pickling by pickling liquids stored in the third tank (11c) and the final tank (11d) of a continuous pickling device (10), determines respective acid liquid supply amounts to the third and final tanks (11c, 11d), and allows the an acid liquid supply system (12) to supply acid liquid. The acid concentrations of pickling liquids respectively stored in the acid liquid-supplied third and final tanks (11c, 11d) are continuously measured by acid concentration continuous measuring devices (13c, 13d), and acid liquid is supplied from the acid liquid supply system (12) to the third and final tanks (11c, 11d) based on the continuously measured values of measured acid concentrations so that the acid concentrations of pickling liquids stored in the third and final tanks (11c, 11d) match respective target values. Thereby, it is possible to increase, while restricting the acid concentration of pickling liquid from the final pickling tank to up to 12%, the acid concentrations of pickling liquids stored in the other pickling tanks.