Synthesis Of Temperature-sensitive Polymer Flocculant And Its Flocculation Behavior

With the increasing amount of conventional energy coal and oil,the exploitation of oil sand is increasing day by day.A large number of oil sands mining produce large amounts of tailings,the formation of the days and months multiplying tailings pond.The environmental problems caused by tailings ponds and the two utilization of circulating water have been the hot spot of research.Especially,the problem of the separation of the asphalt from circulating water in tailings pond has not been solved very well.Therefore,in order to speed up the settlement of clay minerals in tailings pond and it also can effectively avoid the influence of residual flocculant in water on the asphaltene treatment.Studying on the flocculation of kaolinite which is the highest clay content in tailings and the flocculation of the conventional flocculant,at the same time researching and developping a new type of flocculant to solve these problems has very important significance.In this paper,we analyzed the flocculation of kaolinite in phase condensation and conventional flocculant in different p H conditions by using the dissipative quartz crystal micro balance?QCM-D?from the dynamic point of view.It is concluded that the ability of kaolinite is stronger than that of the weak alkaline condition under weak alkaline condition.The flocculation ability of cationic polyacrylamide in weak alkaline condition for kaolinite is stronger than in neutral and weakly acidic conditions The anionic polyacrylamide under weak acidic conditions flocculation ability is better than neutral and alkaline conditions.The flocculation ability of cationic polyacrylamide to kaolinite is stronger than that of anionic polyacrylamide.Using the principle of situ polymerization of organic inorganic hybrids with such organic and inorganic materials.In this paper we first use of N-isopropyl acrylamide?NIPAM?temperature response characteristics and cation dimethyl amino propyl methacrylamide?DMAPMA?in deionized water with redox trigger conditions to synthetic organic polymers p[NIPAM-co-DMAPMA].And using ferric hydroxide colloid solution instead of deionized water,and polymerized of the organic-inorganic temperature sensitive type hybrid flocculant Fe?OH?₃-p[NIPAM-co-DMAPMA],and used a variety ways to characterization.The results showed that ferric hydroxide colloid particles with ionic bonds of bonded in polymer.The characteristic viscosity of Fe?OH?₃-p[NIPAM-co-DMAPMA] in deionized water was 0.78 L/g and its low critical transition temperature?LCST?in the pH 8.5 solution was 35?.The following conclusions can be drawn from the flocculation experiment of kaolinite suspension:1.Hybrid Fe?OH?₃-p[NIPAM-co-DMAPMA] can be coordinated to play the part of organic flocculation bridging and ferric hydroxide colloid electrostatic neutralization.Its flocculation ability is better than p[NIPAM-co-DMAPMA] and physical mixture of {p[NIPAM-co-DMAPMA]+Fe?OH?₃}.2.Adding Fe?OH?₃-p[NIPAM-co-DMAPMA] when the solution temperature is lower than the LCST,and settling when the solution temperature rised above the LCST.Under these conditions,the flocculation effect is the best.In this way can effectively solve the problem of slow settling velocity of clay in tailings pond.Using the temperature sensitive property of polymer.As a result of the heating process,the potential influence of the flocculant in the circulating water can be solved very well in the following treatment.