A kind of treatment method of pickling wastewater in iron and steel industry
A technology for pickling wastewater and treatment methods, which is applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., and can solve the problems of waste of metal resources, difficulty in recycling, and non-recyclability. , to achieve the effect of reducing investment and operating costs, high metal particle separation efficiency, saving space and operation
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[0026] Embodiment 1 adopts the method of the present invention to process the pickling wastewater discharged from the cold rolling section of a certain steel plant
[0027] 1. The pickling wastewater discharged from the cold rolling section of a steel factory was introduced into the regulating tank, and the total iron in the wastewater was measured to be 3000mg / L, the concentration of chromium ions was 800mg / L, the concentration of nickel ions was 200mg / L, and the concentration of fluoride ions was 2000mg / L. pH between 1-2;
[0028] 2. The wastewater is introduced into the chromium reduction pool from the adjustment pool. The chromium reduction pool is divided into a primary chromium reduction pool and a secondary chromium reduction pool. The wastewater flows through the primary chromium reduction pool and the secondary chromium reduction pool in turn. Each level of chromium reduction A sufficient amount of reducing agent sodium metabisulfite is added to the pool for 30 minute...
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