Ion Exchange 2
Ion Exchange 2 :
(n). Drilling Fluids. A process of exchanging one ion for another ion on a charged, solid substrate, such as a natural clay, zeolite or resin. Cation exchange on clay minerals occurs in muds and during mud testing. In muds, various positive ions (for example, Ca+2) on clay surfaces can be replaced by other positive ions (for example, Na+) that occur in higher concentration or have a higher affinity for the substrate. In water muds, cation exchange is an ongoing and dynamic process. In mud testing, the methylene blue dyeis a cationic dye that goes onto clays in the mud sample being tested to show the extent of cation-exchange capacity. Ion exchange is the basis for clay peptization, which can improve a poorly performing clay. Syn: Peptization. See: Beneficiation, Cation, Cation-Exchange Capacity, Clay, Clay-Water Interaction, Hardness Ion, Methylene Blue Test, Resin
