Method for treating potassium chloride cyanide-free cadmium plating wastewater
A treatment method, potassium chloride technology, applied in metallurgical wastewater treatment, water/sewage treatment, chemical instruments and methods, etc., can solve problems such as inapplicability, and achieve the effect of simple and convenient treatment method
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Embodiment 1
[0032] Embodiment 1: a kind of processing method of potassium chloride cyanide-free cadmium plating rinse water
[0033] A. Reduction of hexavalent chromium: transfer potassium chloride cyanide-free cadmium plating rinsing water from the electroplating wastewater adjustment tank to the pH adjustment tank, stir the pool liquid, add dilute sulfuric acid solution to adjust the pH of potassium chloride cyanide-free cadmium plating rinsing water to 3.0, Add a 10% sodium metabisulfite aqueous solution with a mass concentration, use a potentiometer to control the ORP value of potassium chloride cyanide-free cadmium plating rinse water to be -250mV, and adjust the amount of 10% sodium metabisulfite aqueous solution;
[0034] B. Precipitation of heavy metal ions: the potassium chloride cyanide-free cadmium-plating rinse water after step A flows into the precipitation reaction tank, and under stirring conditions, every ton of potassium chloride cyanide-free cadmium-plating rinse water a...
Embodiment 2
[0039] Embodiment 2: a kind of processing method of chromic acid passivation rinse water of cadmium plating layer
[0040] The difference between embodiment 2 and embodiment 1 is that the processing object is the chromic acid passivation rinse water of the cadmium plating layer, and the remaining parameters and operations refer to embodiment 1.
[0041] The treatment results show that the contents of cadmium and chromium in the chromic acid passivation rinse water of the treated cadmium plating layer all meet the requirements in Table 3 of GB21900-2008 "Electroplating Pollutant Discharge Standard" (cadmium 0.01mg / L, chromium 0.5mg / L) .
Embodiment 3
[0042] Embodiment 3: A kind of treatment method of unqualified coating deplating rinsing water
[0043] The difference between embodiment 3 and embodiment 1 is that the processing object is unqualified coating deplating rinse water, and other parameters and operations refer to embodiment 1.
[0044] The treatment results show that the contents of cadmium and chromium in the deplating and rinsing water of unqualified coatings after treatment all meet the requirements in Table 3 of GB21900-2008 "Electroplating Pollutant Discharge Standard" (cadmium 0.01mg / L, chromium 0.5mg / L).
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