Yes, very easily actually.
When not wet or contaminated with food or oil, cardboard is recyclable. As a matter of fact, cardboard can be recycled many times over. Some cardboard is made from almost 100% recycled materials, while most cardboard is made from an average of 70% to 90% recycled material.
When used cardboard arrives at the paper mill, it is sorted shredded and pulped. Shredding breaks the cardboard into teeny tiny pieces, which are mixed with water and chemicals to break down the fibers. This is known as pulping.
A thorough filtering process cleans the pulp of things such as tape, glue, metal clips, and dyes and ink.
The clean pulp is put to dry. When it dries, the pulp becomes solid sheets called linerboards. The linerboards are then glued together layer by layer to create new cardboard, e.g. used to manufacture cardboard boxes and packaging.
Recycling cardboard is an easy way to reduce environmental footprint and degradation. It also reduces production costs of new cardboard because no extraneous materials and energy is needed to manufacture new cardboard boxes.