摘要
采用均相水溶液聚合法,新型水溶性偶氮引发剂M合成了用于赤泥沉降的聚丙烯酰胺絮凝剂。通过大量实验确定了合成的优化条件为:单体浓度为25%;引发剂浓度为单体质量的0.01%;引发温度30℃;介质pH值为6;EDTA-2Na用量为15mg/L;甲酸钠用量为350μg/L。该条件下制得的聚丙烯酰胺分子量可达2000万。通过赤泥沉降实验测试了絮凝性能,相对分子质量为1200万自制絮凝剂NP2用量为30g/t-干赤泥时,沉降速度为13.5m/h,优于Nalco9779,但澄清度不及Nalco9779。
Polyacrylamide used as flocculant in the dewatering of red mud was synthesized with acrylamide using a new type water- soluble azo initiator by the method of polymerization in aqueous solution. By a large amount of experiment, the optimal technological parameter in acrylamide polymerization was established as follows： Monomer concentration： 25 % ; Initiator concentration： 0.01% ;Initiation temperature： 30℃ ; pH value： 6; EDTA - 2Na doasge： 15mg/L; HCOONa dosage： 350μg/L. Under these conditions, molecular weight of PAM synthesized reaches about 20 million. Flocculating effect was determined by red mud settling test. The settling rate of red mud is 13.5m/h when NP2 flocculant synthesized is used. The settling rate is higher than those when Nalco9779 flocculant is used. However. the overflow clarity is worse than using Nalco9779.
出处
《轻金属》
CSCD
北大核心
2008年第2期16-20,共5页
Light Metals
