The proper type and amount of binder can not only make the pressing process go on smoothly, improve the density and strength of pellet, but also improve the thermal stability and reducibility of pellet, which is beneficial to smelting.The binders used for cold consolidation molding mainly include water glass, cement, asphalt, humic acid salt, carboxymethyl cellulose, starch, etc. inorganic binders have side effects of increasing harmful elements in iron concentrate, which may lead to poor metallurgical properties of pellets, so organic binders came into being. The organic binder will volatilize or burn out in the process of pellet roasting, most of which can obviously improve the mechanical strength of pellet, and have strong viscosity, activity and adsorption. Because of its unique characteristics, bentonite can be partially or completely replaced in pellet production, without reducing pellet grade. The problem is that the cost is too high. Its characteristics are soluble in water, which can significantly improve the viscosity of water, thus improving the pelletizing process of fine concentrate, reducing the evaporation rate of water in the drying process, improving the bursting temperature of raw pellets. After drying, the binder forms a film like solid bridge at the contact of many ore particles, which improves the strength of dry pellets.
However, the decomposition temperature of organic matter in organic binder is relatively low. After the wet ball is dried and evaporated at high temperature, most of the binders will decompose and volatilize, and the degree of consolidation will decrease naturally. Generally speaking, the price is too high. These problems limit the application of organic binders. Inorganic binder and organic binder have their own advantages and disadvantages in the process of agglomeration. Therefore, it has been considered that the combination of the two to develop composite binder has been successful. It has been successfully used in coal powder forming and iron concentrate cold solid forming.
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