Abstract:

A modified dicyandiamide?formaldehyde decolorizing flocculant was prepared using cyclohexylamine as modifier, and was used to simulate dye wastewater decolorization, flocculation and sedimentation experiments. The effect of reaction temperature, reaction time, material molar ratio and other factors on the decolorization performance of the modified flocculation was studied. The results show that reaction time is 3.5 h, reaction temperature is 85 ℃, material molar ratio of dicyandiamide to formaldehyde to ammonium chloride to cyclohexylamine is 1.00∶3.00∶0.50∶0.15, the decolorization rate 88.6% is achieved at a modified flocculant dosage of 100 mg/L. The decolorization and flocculation performance of the dicyandiamide?formaldehyde modified decolorizer is obviously better than that of the unmodified product.

Key words: Decolorization and flocculation, Dicyandiamide, Formaldehyde, Cyclohexylamine, Modification

摘要：

以环己胺为交联剂，制备了改性的双氰胺?甲醛絮凝剂，并用于模拟染料废水脱色絮凝沉降实验。研究了反应温度、反应时间、物料物质的量比等因素对改性絮凝剂脱色性能的影响。结果表明，在反应时间为3.5 h、反应温度为85 ℃、n(双氰胺)/n(甲醛)/n(氯化铵)/n(环己胺)=1.00∶3.00∶0.50∶0.15、改性絮凝剂的质量浓度为100 mg/L的条件下，脱色率可达到88.6%，双氰胺甲醛型改性脱色剂的脱色絮凝性能明显优于未改性产品。

关键词: 脱色絮凝, 双氰胺, 甲醛, 环己胺, 改性