Secondary and tertiary crushing
Secondary and tertiary crushing, if necessary, are the final steps in reducing the material to a desired product size. Historically, cone and roll crushers were the most common choice crushers, but in recent years impact crushers are more widely used. These crushers also are sometimes used as primary crushers for fine-grained gravel deposits.
The cone crusher (a compression type) simply crushes the aggregate between the oscillating cone and the crusher wall. Clearance settings on this equipment are required to be checked and maintained as part of standard operating procedure.
As with other compression crushers, the cone crusher yields a somewhat elongated and slivery particle shape. This may be minimized, however, by “choke” feeding the crusher. This technique will also make the shape and size more uniform. One way to choke feed is with a surge hopper and a controlled belt-feed to the cone crusher. Automatic level controls measure the head of the material over the top of the cone.
A roller crusher is another compression type crusher that simply breaks the material by pinching the aggregates. These types of crushers are often found in gravel operations.
Roller crushers have constant maintenance problems and are prone to excessive wear. The rollers are required to be checked frequently to insure proper clearance and uniformity across each roller. Rebuilding and remilling the roller is a standard operating procedure.
Secondary and tertiary crusher manufacturer NFLG
Primary, Secondary, Or Tertiary Crushing Machine Suppliers, Offering All Kinks Of Stone Crushers And Static & Portable crushing plant . Depending on the purpose of their use, the crushing machine can be constructed in the following versions: jaw crusher , cone crusher, impact crusher , gyratory crusher , hammer crusher , mobile crusher etc.
NFLG has been serving the aggregate crushing & grinding industry for over 20 years, it is one of the most famous rock and mineral processing company in the world. NFLG has a group of bridle-wise workers and experienced on-site engineers, who ensure every set of equipments is of high performance and high reliability.
Cone crusher series: Unique crushing ability in primary, secondary and tertiary crushing. Standard type is for PYZ (secondary crush); middle type is for PYD (tertiary crush); short-head type is for primary and secondary crush.
VSI crusher series: NFLG Company offers three types of VSI crusher(PCL/VSI/VSI5x), introduces high quality roller bearing like Sweden SKF and America TIMKEN, which ensure the smooth running of main unit.