OCC造纸白水脱色后用于混合办公废纸脱墨浆生产的实践

Production Trials of Utilizing White Water from Decolored OCC for MOW Deinked Pulp Production

关键词:  造纸白水  混合办公废纸  气浮  脱色剂  絮凝剂

Key Words:papermaking white water  MOW  flotation  decolorant  flocculants

摘要:本研究主要探讨了浙江景兴纸业PM15纸机将废旧瓦楞箱纸板（OCC）造纸白水脱色后用于混合办公废纸（MOW）脱墨浆的生产实践。实验室和中试试验表明，双元脱色剂处理可以提高OCC清白水脱色效率，使气浮出水完全达到MOW制浆线回用水的要求（浊度<160 NTU，色度<900 CU）。其中最佳化学品用量为：脱色剂聚硅酸硫酸铝（PASS）500 mg/L，脱色剂改性双氰胺甲醛树脂（MDF）40 mg/L，固体絮凝剂阴离子聚丙烯酰胺（APAM）10 mg/L。处理后水样浊度从未处理前的361 NTU降到69 NTU，去除率为80.9%，色度从2740 CU降至382 CU，去除率为86.1%。使用该方案中试后，清水耗用量降低3.3 m³/t纸，化学品成本节约3.8元/t纸，每年可节省成本约243.6万元。

Abstract:The production trails of utilizing white water from decolored OCC to replace fresh water for MOW deinked pulp production in Zhejiang Jingxing PM15 was introduced in detail in this paper. Lab and pilot tests had proved that dual decolorant treatment could improve the decolorization efficiency of OCC clean white water， so that the air flotation could meet the requirements of the recycling water for MOW pulping production （turbidity<160 NTU， chroma<900 CU）. The results showed that optimal chemical dosage was decolorant polyaluminum silicate sulfate （PASS） of 500 mg/L， decolorant modified dicyandiamide formaldehyde resin （MDF） of 40 mg/L， and solid flocculant anionic polyacrylamide （APAM） of 10 mg/L. Compared to the water before treatment， the turbidity of the treated water sample was reduced from 361 NTU to 69 NTU，with the removal rate of 80.9%， and the chroma was reduced from 2740 CU to 382 CU， with the removal rate of 86.1%. After applying this process， the consumption of fresh water was reduced by 3.3 m³/t paper， and the chemical cost was saved by ¥3.8/t paper， which achieved the purpose of energy saving and consumption reduction. Meanwhile， an annual economic benefits of ¥2.436 million could be saved as well.