Pickling system and pickling method

Abstract

The invention relates to the plating field and discloses a pickling system and a pickling method. The pickling system comprises a pickling bath group (1) which comprises a plurality of pickling baths (101) that are arranged between a feeding end and a discharging end in the length direction of the pickling system, and parts to be pickled can be sequentially pickled in the pickling baths (101). Through step-by-step pickling of the parts to be pickled in the pickling baths, not only can the pickling quality be improved and the parts to be pickled be prevented from mis-plating, but also a pickling agent in one of the pickling baths can be transferred to the upper stage step by step, a pickling solution, of which the concentration is reduced and impurities are increased, in the first-stage pickling bath can be discharged and disposed, the dilution speed of the pickling agent in the multiple stages of the pickling baths is reduced, accordingly, the utilization ratio of the pickling agent is improved, and the production cost is lowered.

Description

technical field [0001] The invention relates to the field of plating, in particular to a pickling system and a pickling method. Background technique [0002] Hot-dip galvanizing is an effective metal anti-corrosion method, which plays an important role in reducing corrosion and prolonging the life of metal parts, saving energy and materials. Generally, the hot-dip galvanizing process steps of metal parts include: loading - pickling, rinsing, fluxing - drying - hot-dip galvanizing - internal and external blowing - cooling - passivation - inspection. Among them, pickling is a key link in the production process of hot-dip galvanizing, and the quality of pickling directly affects the quality of hot-dip galvanizing products. At present, the pickling process in the hot-dip galvanizing industry adopts the pickling-rinsing-helping method. The pickling material used is hydrochloric acid. The specific steps are: pickling, soaking the metal parts in the pickling pool to remove the oxi...

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Problems solved by technology

[0004] However, this pickling method has the following problems: (1) A large amount of acid mist is generated during the pickling process, which is difficult to collect and recycle. The acid mist will cause corrosion and damage to the plant and equipment, pollute the environment, and endanger human health at the same time (2) the pickling efficiency is low, the pickling quality is poor, and the missing plating phenomenon caused by insufficient pickling often occurs; (3) the acid consumption is large, and a large amount of rinse water needs to be used after pickling, resulting in acid and water A lot of waste of resources; (4) The cost of waste acid and waste water treatment is high, and the direct discharge of waste acid and waste water will cause serious pollution to the environment

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