Coarse Crushing and Processing Services Explained
Minerals contain chemical compositions that are useful to many different industries. Typically their properties can be economically extracted using crushing and grinding processes. Minerals are used to make a wide variety of mixes, powders, slurries, and solids. Custom Processing Services, a contract manufacturer offering toll manufacturing services and toll processing, or tolling, provides a range of drying, sizing, and mixing services. Methods used to achieve Custom Processing Coarse Grinding results include jaw crushing, impact crushing, roll crushing, and pulverizing. Drying is done with flash dryers or horizontal kiln drying. Mixing is done with a ribbon blender. Custom Processing Services also offers ultra fine grinding and micronizing of chemicals, minerals, pharmaceuticals, waxes, paints, pigments and personal care products in the micron and sub micron (nano) particle size range.
Coarse crushing falls into three categories.
Jaw Crushing
- Largest raw feed handler: 24″ Pennsylvania Jaw Crusher
- When material is too large to process through the jaw crusher, a pre-crush is done using a ram hammer
- Raw feed is no larger than 8 inches or less
- The Jaw crusher reduces feed to approximately ¾″ X down
- Material then is placed on a conveyor belt and fed to a large rotary kiln dryer.
Drying
- The dryer is either used to drive off unwanted moisture or to heat the materials before crushing.
- From the dryer, material goes into a bucket elevator and is taken vertically over an impactor which is similar to a hammer mill.
Impact Crushing
- From the dryer material goes into a bucket elevator and is taken vertically over an impactor which is similar to a hammer mill.
- The material can further be sized based on how many times and how fast the impact hammers strike the material..
- Pennsylvania Reversible Impactor - a set of three hammers that smash material between the hammers and breaker blocks.
- “Sledge Hammer” action with three different speeds
- Size reduction: Typical range is ½″ to below 30 mesh
Screening
- Material exiting the impactor is then taken vertically up into a screener deck via bucket elevator.
- Typically, two screens are used to capture material between a large screen and a smaller screen. Over sized material is sent to a roll crusher and them back to the impactor. Undersized material is often kept separate from screen size or customers ask for a Mesh meaning the customer wants a size no bigger than a specification but the material can be as small as it is made.
Roll Crushing
- 18″ × 30″ Roll Crusher
- The roll crusher will reduce oversize material and then send the material back through the Impactor for further crushing.
Custom Processing Services includes a full range of particle size reduction options, from crushing to pulverizing to ultra fine micronizing and media milling.
Bio: Linda Dunkelberger is a freelance writer and editor. “Coarse Crushing and Processing Services Explained” briefly states the definition of Processing Services and procedures for Coarse Crushing. Custom Processing Services, in Reading and East Greenville, Pennsylvania, is a contract manufacturer (toll processor) offering ultra-fine micronizing, grinding, pulverizing, blending, drying, surface treating, heat treating , screening and packaging for materials such as chemicals, pharmaceutical excipients, waxes and minerals just to name a few.