Characteristics of attapulgite clay
The attapulgite clay ore is a soil-like structure with grayish white, blueish gray, light yellow, and light green colors. Grease luster, light specific gravity, Mohs hardness 2-3, sticky and plastic when wet, small shrinkage on drying, no cracks, strong water absorption, can reach more than 150%, pH = 8.5, due to the internal porous channel , The specific surface area is large, which can reach more than 350M2 / G. Most of the cations, water molecules and organic molecules of a certain size can be directly absorbed into the pores, and its electrochemical performance is stable. The attapulgite crystals with a magnification of 40,000 times are rod-shaped and fibrous, with a length of 0.5-5 micrometers and a width of 0.05-0.15 micrometers. It is a 2: 1 type clay mineral, that is, two layers of silicon-oxygen tetrahedron sandwiched by a layer of aluminum-oxide Noodles. Attapulgite clay minerals have the properties of nanomaterials and are nanostructured mineral materials with nanochannel structures. Because of their very large specific surface area and certain ion exchange properties, they are widely used as desiccants, moisture-proof beads, adsorbents, Catalyst carrier and antibacterial agent carrier. Researchers have produced nano-attapulgite with a purity of more than 99.5%, with a diameter of 20-20 nm and a length of 0.5-1.5 microns.