Bentonite in Iraq is a clay rock, also known as montmorillonite clay rocks, often contains a small amount of kaolinite, halloysite, quartz, feldspar, calcite, etc. Bentonite has strong moisture absorption and expansion can be adsorbed 8 to 15 times on its own volume of water, the volumetric expansion of up to several times to 30 times; have a certain adsorption capacity for various gases ...