用褐铁矿制备聚硅氯化硫酸铁的研究
摘要: 通过正交实验研究了用盐酸、硫酸、褐铁矿和硅酸钠制备聚硅氯化硫酸铁（PSFCS）絮凝剂的工艺条件。实验结果表明，浸取时间为2.5～3 h，浸取温度为110℃，硫酸浓度为6 mol/L，盐酸浓度为3 mol/L，质量液固比为4∶1，铁的浸出率可达95.7%～96.3%。溶液中加入少量聚乙烯醇作稳定剂，亚硝酸钠作氧化催化剂。PSFCS的合成条件：Fe/Si摩尔比为2，硅酸活化pH值为2，硅酸活化时间是30～40 min，陈化时间是2～2.5 h。与聚合硫酸铁（PFS）和聚合氯化铝（PAC）比较了处理印染废水的效果，表明PSFCS具有良好的絮凝性能，COD和浊度的去除率分别可达81.4%和96.1%。
Study on preparation of poly-silicic-ferric chloride sulfate using limonite
- 1. Huaihai Institute of Technology, Lianyungang 222005)
- Received Date:
2007-12-18
Fund Project:
Abstract: The processing conditions of using hydrochloric acid, sulphuric acid, limonite and sodium silicate as raw materials to prepare poly-silicic-ferric chloride sulfate (PSFCS) flocculant are discussed by means of the perpendicular experiment. The experimental result shows that under the condition of lixiviating time being 2.5~3 hours, lixiviating temperature being 110℃, sulphuric acid thickness being 6 mol/L, hydrochloric acid thickness being 3 mol/L, liquid-to-solid quality ratio being 4∶1, the extraction rate of iron will reach 95.7%~96.3% in mass fraction. In the experiment, ounce stabilizing agent pva and oxidation catalyst sodium nitrite were added into the solution. The synthesis condition of PSFCS were: Fe-to-Si mol ratio being 2, silicic acid activation pH being 2, silicic acid activation time being 30~40 minutes, ageing time being 2~2.5 hours. Compared with the performance of polymerization ferric sulfate (PFS) and polyaluminium chloride (PAC),the result indicates that PSFCS has good flocculation performance, and can purge the dyeing wastewater effectively, the removal rates of the turbidity and COD can reach 81.4% and 96.1% respectively.
点击查看大图
下载:
