System and method for recycling iron and zinc from hot galvanizing waste acid

Abstract

The invention discloses a system and a method for recycling iron and zinc from hot galvanizing waste acid, and belongs to an industrial waste resourceful treatment technology. The system comprises: awaste acid storage tank, a bubbling type iron removal device, a first plate-and-frame filter press, a zinc precipitation device, a calcium hydroxide preparation tank, a second plate-and-frame filter press and a calcium chloride solution storage tank, the bubbling type iron removal device is respectively connected with the waste acid storage tank, the first plate-and-frame filter press and the calcium hydroxide preparation tank; and the zinc precipitation device is respectively connected with the first plate-and-frame filter press, the second plate-and-frame filter press and the calcium hydroxide preparation tank. The waste acid storage tank, the bubbling type iron removal device, the first plate-and-frame filter press, the zinc precipitation device, the calcium hydroxide preparation tank,the second plate-and-frame filter press and the calcium chloride solution storage tank are arranged, iron and zinc in the hot galvanizing waste acid are separated and recycled through the processes ofreaction, filter pressing and the like on the hot galvanizing waste acid, therefore considerable economic benefits are achieved, and the system and method have positive environmental protection significance.

Description

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AI Technical Summary

Benefits of technology

This technology helps recover valuable metals from spent acids that have been treated with various chemicals for several years or decades ago. By separating out these metal compounds during treatment, it becomes easier to reuse those resources without harmful side effects on other parts of our environment. Additionally, this separation allows us to reduce costs while still utilising useful energy sources like electricity. Overall, this technology makes better ways to dispose of industrial wastes more efficiently and economically.

Problems solved by technology

The technical problem addressed by this patented technology relates to finding ways to reuse valuable metals like Iron (Fe) or Zinc (Zn), while miniming environmental concerns associated with disposal of spent acid containing Fe/Zn impurities during production processes such as cleanings and activation treatments.

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