聚合硫酸铁的合成试验

EXPERIMENTAL INVESTIGATION ON SYNTHESIS OF POLYFERRIC SULFATE

进行了聚合硫酸铁合成试验 ,探讨了反应温度、压力、硫酸用量和催化剂用量对反应速率及产品质量的影响 .结果表明 ,温度对反应速率的影响符合向下弯曲的抛物线 ,其最佳操作温度为 12 0℃ ;提高压力、增加硫酸及催化剂用量 ,都可提高合成反应速率 ,且合成速率与催化剂用量成正比 ,但当压力升高至 0 .3MPa以上时 ,继续升高压力对提高反应速率的贡献很小 .当硫酸与亚铁离子的摩尔比为 0 .2 5～ 0 .5 0时 ,减少硫酸用量可显著提高产品盐基度 ,但当该比值小于 0 .2 5时 ,生产过程将产生大量氢氧化铁凝胶沉淀 。

Synthetic tests of polyferric sulfate (PFS) is carried out in this paper. The effects of the operation temperature, pressure, dosages of sulfuric acid and catalysts on reaction rate and quality of product are investigated. The results indicate that the effect of temperature on reaction rate is like a parabola with a downward curvature, and the homologous best temperature is about 120°C. The reaction rate for synthesis of PFS is directly proportional to the dosage of catalysts and increases progressively with increasing dosage of sulfuric acid as well, but the rate increase will become unremarkable unless the pressure is less than 0.3 MPa. When the molar ratio of sulfuric acid to ferrous ion is in the range of 0.25-0.50, the alkalinity degree of the final product will increase with the decrease of sulfuric acid dosage. Once when the molar ratio is less than 0.25, the alkalinity degree and ferric content will remarkably decrease and a lot of ferric hydroxide precipitates.