Treatment of Acid-Containing Exhaust Gas
There are two methods for treating acid-containing exhaust gas. Firstly, during the construction of workshops, a ventilation structure for natural exhaust can be designed to utilize air convection to discharge harmful gases. Secondly, an acid tank ventilation system with a blow-suction device can be adopted to directly draw acid mist out of the workshop through the blow-suction port at the tank edge. The acid mist is then removed by alkaline spray liquid in a waste acid treatment tower before being discharged into the atmosphere. This is currently a widely adopted method by manufacturers both domestically and internationally.
Treatment of Zinc Dust
When workpieces are galvanized in a zinc bath, a large amount of zinc vapor and ammonium chloride vapor are generated due to the evaporation of flux on the workpiece surface. The concentration of zinc dust (zinc chloride) in these gases is 1015g/m³, and the concentration of lead dust is 0.120.15mg/m³. For these dusty gases, the current method involves installing a blow-suction device at the tank edge to extract the harmful dusty air, which is then filtered through a baghouse dust collector [3]. This dust collector can capture dust particles larger than 5 micrometers with a capture rate of over 99%, fully meeting environmental protection standards. Additionally, pure zinc ash can be recovered, resulting in greater economic benefits.
