Melting technique melt agglomeration

See Binding mechanism (Section 2.2). Technique involving induration of green agglomerate by heat. Generally, bonding at a temperature below the melting point of the main constituent by application of heat. 

The fust documented development of fertilizer granulation in suspended solids agglomerators was in the early 1960s using the spouted bed technique, and in 1970 Fisons Fertilizer Ltd, UK, introduced prilling , the granulation of fertilizers from a melt by solidification of droplets in a vertical cooling chamber. 

For a variety of applications, spherical particles are required. Many of these are associated with the field of powder metallurgy. While it is relatively easy to produce spherical particles from low melting materials by conventional techniques, such as shot or prilling towers (see Chapter 5), refractory solids in general and, specifically, high melting point metals can not be converted by these techniques. However, if the solid is available in powder form, various methods are available to produce spherical particles by agglomeration. 

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