MMH的结构与提粘提切机理研究

A STUDY ON THE CRYSTAL STRUCTURE OF MMH AND THE THICKENING MECHANISMS IN MMH MUD

本文利用Ｘ射线衍射仪，微电泳仪对ＭＭＨ的晶体结构，等电点（ＩＥＰ）进行了研究。结果表明，ＭＭＨ是属于六方晶系的晶体，其表面电荷密度的理论值是蒙脱土的２—４倍，表面羟基呈碱性；ＭＭＨ提粘提切机理：一是ＭＭＨ同蒙脱土的静电引力；二是两种颗粒表面羟基的氢键化作用，这两种作用是协调一致的。

The crystal structure of MMH and its thickening mechanisms in mud are studied by X ray diffraction and isoelectric point measurements. It is shown that the crystal lattice of MMH is hexagonal and the lattice parameters c and a increase with Mg/Al ratio; the value of surface charge density of MMH theoretically calculated is 2—4 times larger than that of montmorillonite; the sufrace hydroxyls are of basicity; the mechanisms involved in MMH mud thickening are:(1) strong electric attraction between MMH and montmorillonite particles; (2)hydrogen bond formation between surface hydroxyls of these particles.