What is fused calcium chloride?
The term &quot;fused&quot; in chemistry generally refers

to become physically joined together

as by melting, adherence or other means of consolidation [1].
At an industrial scale solutions containing $\ce{CaCl2}$ are obtained either as by-products in the production of soda (by the ammonia method) and Berthelot's salt, or by the adding $\ce{HCl}$ to limewater. Solutions are then evaporated and $\ce{CaCl2}$ is isolated as a white or greyish porous mass, which is called fused calcium chloride and is generally water-free or contains trace amounts of water.
To make it clear, in this case &quot;fused&quot; ≠ &quot;melted&quot;, as it's not about melting $\ce{CaCl2}$ (m.p. = $\pu{772^\circ C}$), but rather a physical adhesion as a result of a set of steps applied to calcium chloride solution (or its deliquescent form) of gradually increasing the temperature from $\pu{70 .. 80^\circ C}$ to approx. $\pu{300^\circ C}$. This results in formation of hydrated forms ($\ce{CaCl2 * x H2O}$) with subsequent complete dehydration and solidifying above $\pu{250^\circ C}$ alongside with minor partial hydrolysis to form $\ce{CaO}$ and $\ce{HCl}$.
Fused refers to the fact that this porous mass is granulated, but not dispersed, in order to increase the surface area and improve its dehumidifying ability and at the same time to prevent the salt from deliquescing swiftly.
Reference

fused. (n.d.) American Heritage® Dictionary of the English Language, Fifth Edition. 2011.