Pulverizing Materials in the Extreme Fineness Range
The Raymond® vertical mill is a specialized unit intended for pulverizing materials in the extreme fineness range. The principle of integral air classification, originally developed by Raymond, has been applied with outstanding success to this mill and as a result a great many materials can be produced in the lower micron sizes with a very minimum of oversize.
The Raymond® Vertical Mill is a high-speed air swept swing hammer mill used to pulverize materials in the extreme fineness range. The principle of integral air classification, originally developed by Raymond, has been applied with outstanding success to this mill. As a result, a large number of products can be reduced to 95% to 99% passing 15 to 20 microns while others with smaller crystalline structure can be ground as fine as 95% to 99% passing 5 to 10 microns.
The Raymond® Vertical Mill is well adapted to the grinding of non-metallic minerals and manufactured materials in the extreme fineness range. Typical materials processed include graphite, limestone , cocoa powder, marble, kaolin, sugar, talc, certain synthetic resins, organic and inorganic colors, phosphate, chemicals, glass, enamel, food products, pharmaceuticals and a variety of chemicals.
Raymond® Vertical Mill Advantages
» Uniform particle size
» Unit swings open easily for inspection, cleaning and maintenance
» Easy replacement of wearing parts
» Simple straightforward operation
» Compact design requires little floor space
» Available with integral flash drying or water-cooled grindingchamber
Particle Size Range
In many cases, this Raymond mill operates in the fluid-energy mill fineness range. In most instances, ultimate crystalline particle size of the particular material handled has a definite effect on the fineness and determines the highest particle size range available. Thus, many products can be reduced with this mill to 95% to 99% passing 15 to 20 microns while some products with smaller crystalline
structure can be ground as fine as 95% to 99% passing 5 to 10 microns.
Principle of Operation
The distinguishing feature of the vertical mill is the straightforward manner of operation with no need for close clearances or complicated adjustments. One vertical shaft carries all the rotating parts within the mill. On top is the fan which produces the required air flow. Below this are the two banks of whizzers which do the classifying, and below these are the hammers or accelerating elements.
The feed enters the mill through the side mounted variable speed screw feeder between the hammers and the whizzer classifier. The airflow enters below the grinding chamber and carries pulverized material vertically, combining it with newly introduced feed, to the classifier where any acceptable material is removed from the mixture prior to being ground. This optimizes grinding efficiency and reduces power consumption.
The classifier’s high speed cyclonic action concentrates the coarser fraction along the walls where it
falls back to the grinding chamber for further size reduction. The pulverizing action combines impact of the hammers and attrition with the grinding chamber walls. The airflow then carries the reduced material to the classifier, where the finer material is separated from the combination of ground material and new feed, and it is then transported to the product collection system.The system airflow may recycle through the mill with only a portion vented in many applications, or it operates as a once-through system and
all the air is vented when the feed material is heat sensitive.
Range of Uses
The Raymond® Vertical Mill is well adapted to the grinding of a considerable number of non-metallic minerals and manufactured materials where these products are desired in the extreme fineness range.Typical materials processed include graphite, limestone, cocoa powder, marble, kaolin, sugar, talc, certain synthetic resins, organic and inorganic colors, phosphate chemicals, glass,enamel,pharmaceuticals, food products, and a variety of chemicals.
Mill Sizes
Raymond® Vertical Mills are available in two grinding chamber sizes – 18 and 35 inch. These mills are similar in operation and construction. Both are exceptionally compact requiring an usually small amount of floor space for their power transmission and product surface area capabilities. Pulverizing Materials in the Extreme Fineness Range The following table summarizes the Raymond® Vertical Mill’s performance features.
Preparation for Pulverizing
It is important that the materials be fed to the mill are properly sized. Materials to be ground should be pre-crushed to a maximum of 1/4 inch (6mm) in size and with some materials the best results can be obtained starting with a maximum of 10 to 20 mesh material. Feed rate and fineness can be easily and accurately controlled with the variable speed feeder which is furnished as standard equipment with both the 18″ and 35″ mills.
Built to Insure Dependability
Raymond® Vertical Mills are built to insure dependable operation year-afteryear. They are designed with heavy iron castings to get the rugged construction necessary to carry the high-speed vertical shaft and bearings. We dynamically balance the complete rotor with hammers and discs, whizzers and exhaust fan after assembly to provide a smooth, vibrationless operation.
The main body is built with a hinged section that allows for easy access for inspection, maintenance and cleaning. Depending on the model, the mill is either v-belt driven or direct-connected to the motor through a flexible coupling.
Raymond vertical mill application
Application area: Glass fiber industry, coal industry, chemical industry, and for large scale powder making and non mental mine industry.
Successfully grinded material: Pyrophillite, coal, calcite, barite, limestone, lime powder, marble, silica, talc, kaolin, gold ore, ferrite, clay, slag, marble, and so on.
Material requirements: max feeding size less than 55mm
Components of grinding line : Vertical mill plant is made up of feeding part, discharging part, gyre part, grinding table, decelerator, and roller and so on.
Archives
Recent Posts
Categories
Calendar
Meta
Raymond vertical mill
Pulverizing Materials in the Extreme Fineness Range
The Raymond® vertical mill is a specialized unit intended for pulverizing materials in the extreme fineness range. The principle of integral air classification, originally developed by Raymond, has been applied with outstanding success to this mill and as a result a great many materials can be produced in the lower micron sizes with a very minimum of oversize.
The Raymond® Vertical Mill is a high-speed air swept swing hammer mill used to pulverize materials in the extreme fineness range. The principle of integral air classification, originally developed by Raymond, has been applied with outstanding success to this mill. As a result, a large number of products can be reduced to 95% to 99% passing 15 to 20 microns while others with smaller crystalline structure can be ground as fine as 95% to 99% passing 5 to 10 microns.
The Raymond® Vertical Mill is well adapted to the grinding of non-metallic minerals and manufactured materials in the extreme fineness range. Typical materials processed include graphite, limestone , cocoa powder, marble, kaolin, sugar, talc, certain synthetic resins, organic and inorganic colors, phosphate, chemicals, glass, enamel, food products, pharmaceuticals and a variety of chemicals.
Raymond® Vertical Mill Advantages
» Uniform particle size
» Unit swings open easily for inspection, cleaning and maintenance
» Easy replacement of wearing parts
» Simple straightforward operation
» Compact design requires little floor space
» Available with integral flash drying or water-cooled grindingchamber
Particle Size Range
In many cases, this Raymond mill operates in the fluid-energy mill fineness range. In most instances, ultimate crystalline particle size of the particular material handled has a definite effect on the fineness and determines the highest particle size range available. Thus, many products can be reduced with this mill to 95% to 99% passing 15 to 20 microns while some products with smaller crystalline
structure can be ground as fine as 95% to 99% passing 5 to 10 microns.
Principle of Operation
The distinguishing feature of the vertical mill is the straightforward manner of operation with no need for close clearances or complicated adjustments. One vertical shaft carries all the rotating parts within the mill. On top is the fan which produces the required air flow. Below this are the two banks of whizzers which do the classifying, and below these are the hammers or accelerating elements.
The feed enters the mill through the side mounted variable speed screw feeder between the hammers and the whizzer classifier. The airflow enters below the grinding chamber and carries pulverized material vertically, combining it with newly introduced feed, to the classifier where any acceptable material is removed from the mixture prior to being ground. This optimizes grinding efficiency and reduces power consumption.
The classifier’s high speed cyclonic action concentrates the coarser fraction along the walls where it
falls back to the grinding chamber for further size reduction. The pulverizing action combines impact of the hammers and attrition with the grinding chamber walls. The airflow then carries the reduced material to the classifier, where the finer material is separated from the combination of ground material and new feed, and it is then transported to the product collection system.The system airflow may recycle through the mill with only a portion vented in many applications, or it operates as a once-through system and
all the air is vented when the feed material is heat sensitive.
Range of Uses
The Raymond® Vertical Mill is well adapted to the grinding of a considerable number of non-metallic minerals and manufactured materials where these products are desired in the extreme fineness range.Typical materials processed include graphite, limestone, cocoa powder, marble, kaolin, sugar, talc, certain synthetic resins, organic and inorganic colors, phosphate chemicals, glass,enamel,pharmaceuticals, food products, and a variety of chemicals.
Mill Sizes
Raymond® Vertical Mills are available in two grinding chamber sizes – 18 and 35 inch. These mills are similar in operation and construction. Both are exceptionally compact requiring an usually small amount of floor space for their power transmission and product surface area capabilities. Pulverizing Materials in the Extreme Fineness Range The following table summarizes the Raymond® Vertical Mill’s performance features.
Preparation for Pulverizing
It is important that the materials be fed to the mill are properly sized. Materials to be ground should be pre-crushed to a maximum of 1/4 inch (6mm) in size and with some materials the best results can be obtained starting with a maximum of 10 to 20 mesh material. Feed rate and fineness can be easily and accurately controlled with the variable speed feeder which is furnished as standard equipment with both the 18″ and 35″ mills.
Built to Insure Dependability
Raymond® Vertical Mills are built to insure dependable operation year-afteryear. They are designed with heavy iron castings to get the rugged construction necessary to carry the high-speed vertical shaft and bearings. We dynamically balance the complete rotor with hammers and discs, whizzers and exhaust fan after assembly to provide a smooth, vibrationless operation.
The main body is built with a hinged section that allows for easy access for inspection, maintenance and cleaning. Depending on the model, the mill is either v-belt driven or direct-connected to the motor through a flexible coupling.
Raymond vertical mill application
Application area: Glass fiber industry, coal industry, chemical industry, and for large scale powder making and non mental mine industry.
Successfully grinded material: Pyrophillite, coal, calcite, barite, limestone, lime powder, marble, silica, talc, kaolin, gold ore, ferrite, clay, slag, marble, and so on.
Material requirements: max feeding size less than 55mm
Components of grinding line : Vertical mill plant is made up of feeding part, discharging part, gyre part, grinding table, decelerator, and roller and so on.