Film Processing Device

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Passivation of the concentrated liquid with a lifting pump to the concentration of the input into the pool, through the metering pump will be added to the reduction pool of the sulfuric acid tank, so that the pH value of the pool to reach 2-3, and then through the metering pump will be reduced to the reduction of the pool of sub sulfuric acid, the six reduction of chromium.

After reduction treatment of passivating solution and pretreatment, zinc plating, nickel plating rinse water into the regulation pool, all kinds of waste water in the regulation pool after full after homogenization by lifting pump up to the reaction tank 1, through the metering pump into CaCl2, to destroy the Zn2 + complexes, in 2 of the reactor through the metering pump into NaOH, adjusting the pH value in the range of 9 / 11 and waste water into the reaction pool 3, through the metering pump enter aid coagulant PAM, after into the inclined plate settling pool, metal hydroxide formed sludge sank to the bottom of the sludge bucket, the supernatant by gravity into neutralization tank for pH adjustment and transferred back to the pH in the range of 6 to 9, and then discharged. Inclined plate sedimentation tank sludge discharged periodically to sludge pool, with van type filter press into cake Sinotrans buried deep, the sludge water return regulation pool


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