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 If the cohesive forces (particulate cohesion, valence forces, recrystallization, van Der Waals forces...) between the particles are low, a binder has to be used before agglomeration. The physical properties of the feed material, the end use of the briquettes and the cost of binder addition have to be taken into account before a selection is made. A large variety of (liquid or solid) binders is offered : starch, bentonite, bitumen, lime, cement, water, flour, lignosulphonates, molasses, polymer, resin, sodium silicate, etc...The briquettes are obtained at a low or high pressure and can undergo mechanical or thermal treatment according to the characteristics of the processed material, the binder used and the desired end product.According to the material, the binder that may be necessary and the end-product required, the main stages of the process can be as follows :- Product preparation unit (screening-crushing, drying, sieving) - Dosing and mixing of product with binder - Briquetting unit - Post treatment of the briquettes (air or oven drying, curing, polymerization, aging)
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