Green Sand Reclamation & Dust Control
湿型砂再生与车间粉尘控制
标签：湿型砂, 砂再生, 矽肺防护, 除尘
湿型砂每次回用前经磁选（除铁豆）→过筛（除砂块）→除尘（除微粉）三级处理，循环砂死黏土含量控制在 8–12%，超限则混砂时补新砂并把有效膨润土补到 6–8%、有效煤粉 4–6%。落砂机与混砂机密闭并配布袋除尘，车间粉尘浓度须 <4 mg/m³（游离 SiO₂ 超 10% 时更严）——矽肺是铸造业头号职业病。型砂性能以透气率 80–120、湿压强度 90–130 kPa 为常规窗口，每班快检一次维持循环品质。
Green sand passes three steps each cycle — magnetic separation (shot), screening (lumps), and dust extraction (fines) — with dead clay in the circulating sand held at 8–12%; when exceeded, blend new sand and top up active bentonite to 6–8% and seacoal to 4–6%. Enclose shakeout and mullers with baghouse filtration; shop dust must stay under 4 mg/m³ (stricter above 10% free silica) — silicosis is the foundry's signature occupational disease. Maintain permeability 80–120 and green compressive strength 90–130 kPa with a once-per-shift quick test.