It is called a pyx.
Pyx is a metal box or vessel in which the Blessed Sacrament is kept or carried. The term is more aptly applied to the small round metal case (usually gold-plated) used to carry a few hosts for the sick. A larger container used to store Hosts in the Tabernacle may also be called a pyx, but ciborium is the more common term for that. - extracted from Modern Catholic Dictionary by John A. Hardon, S. J.
a container is a bowl or something round that can hold objects
Is the 22 inch round measurement the circumference? The height of the container must also be given.
Practice round
Service Round/U.S. Army has yellow squares on the container.
Pyx
The answer depends on the size of the container as well as its 3-dimensional shape. A "round container" is not a useful description since a cylinder, hemisphere, sphere are all examples of containers which might be described as round.
Service Round/U.S. Army has yellow squares on the container.
Service Round/U.S. Army has yellow squares on the container.
Service Round/U.S. Army has yellow squares on the container.
Someone can determine which round plastic containers are recyclable by looking for a recyclable symbol on the plastic container. If there is a symbol then the plastic container is recyclable.
If you are asking about the round tin container. Then remove the tape around the can and twist it open.