Extrusion Agent

Lignosulfonates are yellowish powders having variable compositions and also variable molecular dimensions (because they are polymers that can be modified by the addition of organic or inorganic groups to the molecule). They are anionic derivatives of lignin, water soluble and surfactants. Lignosulfonates are very effective in increasing mechanical green and dry strength in ceramic pieces. In addition, they act as lubricants during extrusion or pressing operations. Additions of lignosulfonates to ceramic slips can vary from 0.1 to 2.0% and they are relatively inexpensive. For pressed tiles, 1% lignosulfonate can double mechanical strength (however often a black core appears). Lignosulfonates are often used to reduce shrinkage yet maintain after-forming mechanical strength (because reduced amounts of plastic clays are needed).

Especially,for the chemical fertilizer granulation,could make the wet past into granulation under low pressure extrusion is used for the conversion of powders into granules.

 

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