Water-soluble salts or electrolytes are just some of the mineral contaminates found in everyday tap water used by foundries across the U.S for their green sand systems.
Bentonite is the main bonding compound of green sand systems, and fort it to have quality bonding, it first must be activated with the use of an agent. A good activating agent must fulfil three requirements.
- Be distinctly soluble in water, having a solubility of at least 1 g/100 g of water.
- Be composed of anions, which react with cations (Na+) to give insoluble compunds
- Supply small, univalent cations for ion exchange