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<\/span><\/span> <\/p>水玻璃砂再生技術<\/span><\/span><\/em><\/strong> <\/p>根據水玻璃舊砂的特點，我公司和某科技大學開發成功了“強擦洗新型水玻璃舊砂濕法再生系統”。新型水玻璃舊砂濕法再生系統主要由砂塊破碎機、濕法再生機、砂水分離及脫水設備、污水處理設備等組成。該系統具有如下特點：<\/span><\/span> <\/p>（<\/span>1<\/span><\/span>）采用兩級強擦洗濕法再生工藝，<\/span>Na2<\/sub>O<\/span><\/span>的去除率高：兩級強擦洗濕法再生<\/span>Na2<\/sub>O<\/span><\/span>的去除率為<\/span>85~95%<\/span><\/span>；單級濕法再生，<\/span>Na2<\/sub>O<\/span><\/span>的去除率為<\/span>70~80%<\/span><\/span>。<\/span><\/span> <\/p>（<\/span>2<\/span><\/span>）濕法再生砂的質量好，可代替新砂作面砂或單一砂使用。<\/span><\/span> <\/p>（<\/span>3<\/span><\/span>）濕法再生的耗水量小，噸再生砂耗水<\/span>2~3<\/span><\/span>噸；污水經處理后可循環使用或達標排放。<\/span><\/span> <\/p>“強擦洗新型水玻璃舊砂濕法再生系統”經省部級組織的專家鑒定認為，它具有：系統組成緊揍合理、設備結構簡單新穎、磨損件少，<\/span>Na2<\/sub>O<\/span><\/span>去除率高、再生砂的質量好，耗水量小、用水實現循環等優點，具有很好的推廣應用價值。<\/span><\/span> <\/p>采用兩級強擦洗的新型水玻璃舊砂濕法再生系統工藝流程如圖<\/span>1<\/span><\/span>所示。<\/span><\/span> <\/span><\/span><\/span> <\/p> <\/span><\/span><\/span>圖<\/span>1 <\/span><\/span><\/span><\/span><\/p>新型水玻璃舊砂濕法再生系統工藝流程圖<\/span> <\/p><\/span><\/p> <\/div><\/span><\/p>新型水玻璃舊砂濕法再生系統的關鍵技術是：強擦洗舊砂濕法再生機和少耗水量的兩級濕法再生工藝，污水處理循環回用系統等三項技術。<\/span><\/span> <\/p>廢水玻璃砂治理項目的經濟效益分析<\/span><\/strong> <\/p> 目前，鑄造廠的新砂購入成本約為每噸<\/span>180~300<\/span><\/span>元。初步分析，含泥量較大、細砂含量較多，舊砂的再生回收率約<\/span>75~80%<\/span><\/span>。但濕法再生的水玻璃砂的質量，會優于現有的新砂。按每噸濕法再生砂的成本為60-70<\/span>元計（含電力消耗費、燃料消耗費、設備折舊費、污水處理費、人工管理費等），每噸濕法再生水玻璃砂的經濟效益約<\/span>100~200<\/span><\/span>元。<\/span><\/span> <\/p>因此，如按每年再生<\/span>100,00<\/span><\/span>噸水玻璃砂計算，本項目的年經濟效益約為<\/span>100~200<\/span><\/span>萬元。<\/span><\/span> <\/p><\/div><\/div><\/div>
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