It has been proved that it is economical and feasible to eliminate educt alkali from coarse sodium tungstate with electrodialysis method of negative ion (1) selective membrane.

一价阴子选择膜电渗析法从粗钨酸钠溶液中脱除游经济可的。

The reasons forming abnormal formation pressure mainly includes digenesis, thermogenesis, biochemical action, tectonic action, dialysis, and fluid density difference action.

形成层压力的原因主要有成岩作用、热力作用、生化作用、构造作用、渗析及流体密度差作用等。