碱化絮凝法海水脱硼预处理的研究

采用碱化絮凝法对渤海海水进行脱硼预处理,考察了单因素pH、温度、碱化剂种类、絮凝剂种类、絮凝剂用量、慢搅时间对脱硼效果的影响.结果表明,在30,℃,用碱化剂NaOH调节pH=11,加入絮凝剂聚硅酸铝铁(PAFCS)3,mg/L,聚丙烯酰胺(PAM)1,mg/L,慢搅(50,r/min)15,min,静沉3,h效果最佳,脱硼率达到89.24%,余硼含量0.48,mg/L.利用电子显微镜对浆料Mg(OH)2进行观测分析,初步探讨了碱化絮凝机理.

Study on Pretreatment of Seawater and Boron Removal from Seawater by Alkalization-Flocculation Method

Boron removal from Bohai seawater by alkalization-flocculation have been investigated.The influences of main single factors such as pHt,emperaturet,he types of alkalizer and flocculantt,he dosage of flocculant,and slow stirring time on the boron removal have been explored.The results showed that at 30,℃,pH was adjusted to 11 by alkalizer(NaOH)t,he dosage of flocculant-poly aluminium ferrumiron chloride silicate(PAFCS)was 3,mg/L,and the dosage of polyacryla-mide(PAM)was 1,mg/L,slow stirring time was 15,min,standing time was 3,h,which was the best experimental condition.The rate of boron removal obtained 89.24%t,he remaining amount of boron was 0.48,mg/L.In additiont,he slurry Mg(OH)2 was observed and analysed by electronic microscope,and explored the alkalization-flocculation mechanism primary.