天然苦咸水浸泡凹凸棒石的胶体性能研究

Study on colloidal properties of the attapulgite soaked with natural brackish water

摘要:

利用天然苦咸水浸泡凹凸棒石黏土，考察了浸泡时间对凹凸棒石黏度、流变性和悬浮性等性能的影响。结果表明，苦咸水中所含的金属离子与凹凸棒石棒晶表面离子发生了交换反应，改变了棒晶的表面电荷，从而影响凹凸棒石的胶体性能。浸泡90d后，凹凸棒石表现出最优的悬浮稳定性，浸泡180d后，凹凸棒石的黏度从1188 mPa.s提高到2444 mPa.s。

Abstract:

Attapulgite clay was soaked with natural brackish water, and the effects of soaking time on the viscosity, rheological and suspension stability of attapulgite were intensively investigated. The results indicate that the metal ions in the brackish water were exchanged with the surface ions of attapulgite, which altered the surface charges of attapulgite and thus improved its colloidal properties. After soaking for 90 d, attapulgite exhibits the best suspension stability. After soaking for 180d, the rotary viscosity of attapulgite was increased from 1188 mPa.s to 2444 mPa.s.