新型聚合硫酸铁的制备研究

The Preparation Study of Novel Polyferric Sulfate

进行了新型聚合硫酸铁的合成实验 ,探索了反应温度、反应时间、硫酸用量、氧化剂用量对反应速率及产品质量的影响 ,并利用自制的聚合硫酸铁对染料废水进行了混凝脱色试验。结果表明 ,在常温常压条件下能生成高分子量的聚合硫酸铁产品 ,试验表明产品的混凝脱色性能良好 ,盐基度在 1 2 .7%～ 1 5 .2 % ,CODCr去除率 >80 % ,脱色率 >72 % ;增加硫酸用量及氧化剂用量 ,都可提高合成反应速率 ,当硫酸与Fe2 + 的摩尔比为 0 .1 4～ 0 .3 2时 ,减少硫酸用量可显著提高产品的盐基度 ,但当该比值小于 0 .1 4时 ,生产过程中将产生大量的氢氧化铁凝胶沉淀 。

Synthetic tests of novel polyferric sulfate(PFS) is carried out in this paper.The effects of reaction temperature, reaction time, dosages of sulfuric acid and oxidant on reaction rate and quality of product are investigated, and the flocculating properties of PFS on printing and dyeing wastewater are also studied.The results indicate that the large molecular weight PFS can be synthesized in normal temperature and normal pressure, The alkalinity degree of the novel PFS is 12.7 %～15.2%,and completely suited to treat printing and dyeing wastewater,the removal efficiency of chemical oxygen demand is >80%,the decolorizability is greater than 72%. The reaction rate for synthesis of PFS is increase progressively with increasing dosage of sulfuric acid and oxidant. When the molar ratio of sulfuric acid to ferrous ion is in the range of 0.14～0.32, the alkalinity degree of the final product will increase with the decrease of sulfuric acid dosage.Once when the molar ratio is less than 0.14,the alkalinity degree and ferric content will remarkably decrease and a lot of ferric hydroxide precipitates.