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E-mail
hzhuf@163.com
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Phone
13503187732
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Hongwuzhuang Village, Zaoqiang County, Hebei Province
Zaoqiang Runhe Environmental Protection Equipment Co., Ltd
Waste gas treatment of alkaline spray tower electroplating process
Date: 2025-12-10Read: 12
The electroplating process generates various waste gases during acid washing, passivation, and other processes. The alkaline spray tower converts acidic waste gases into salts (such as NaCl and Na ₂ SO ₄) through acid-base neutralization chemical reactions, while achieving cooling and defogging, laying a foundation for subsequent treatments (such as activated carbon adsorption and RTO).
Structural Design of Alkali Spray Tower Body
| component | Selection Requirements (Customization of Electroplating Scenarios) | Function and advantages |
| Main body of the tower | Diameter of 800-1500mm (single tower), wall thickness ≥ 12mm, flange thickened to 18mm | Adapt to low airflow, ensure structural strength, and prevent negative pressure deformation |
| Packing layer | FRP stepped ring (φ 38 × 38 × 1.2mm) or PP multi-faceted hollow sphere, with a layer height of 1.2-1.8m | Specific surface area ≥ 180m ²/m ³, enhanced gas-liquid contact, acid and alkali corrosion resistance |
| sprinkler system | 2-layer FRP spiral nozzle (spray angle 120 °, aperture 1.5-2mm), nozzle spacing 300-400mm | Avoid clogging the nozzle with viscous impurities in electroplating waste gas to ensure even spraying |
| Defogging layer | FRP baffle defogger (equipped with PTFE wire mesh), defogging efficiency ≥ 98% | Treat alkali mist and heavy metal salt mist in exhaust gas to prevent pollution of subsequent equipment |
| Circulating liquid tank | Volume ≥ 5-minute flow rate of circulating pump, lined with FRP anti-corrosion layer, equipped with liquid level gauge and drain outlet | Store alkaline solution for regular discharge and removal of heavy metal precipitates (such as Cu (OH))₂、Ni (OH)₂） |
Technical parameters for waste gas treatment in alkaline spray tower electroplating process
| parameter | design value | Electroplating scene description |
| Empty tower gas velocity | 0.8-1.2m/s | Lower than conventional industrial waste gas (1.2-1.5m/s) |
| liquid-to-gas ratio | 8-12L/m³ | Higher than normal operating conditions |
| Alkali concentration | NaOH，NaOH，NaClO | |
| Gas liquid contact time | ≥3s | Ensure the reaction time of HCN and other waste gases |
| Circulating pump power | 3-5.5kW | Choose fluoroplastic pump to avoid pump body leakage |
| Tower resistance | 800-1200Pa | The supporting fan should be of anti-corrosion and explosion-proof type |
