How Continuous or Batch Dry Grinding Attritors Work

Dry Grinding Attritors can be operated in Continuous or Batch operation. For a complete explanation of how Dry Grinding Attritors work in both Continuous and/or Batch operation, please download the Technical Paper “Attrition Dry Milling in Continuous and Batch Modes”.

Download PDF (236 KB PDF)

SD Series

The SD Dry Grinding Attritors can be operated in both continuous and batch processing applications. In the continuous operation, the material is fed into the vessel at the top. It then migrates through the agitating media bed where it is processed to a desired particle size and is discharged through metering bar grids at the bottom of the tank.

In the batch mode, material is charged into the mill at the top, ground for a predetermined time, then discharged through grids at the bottom. The system can easily be sealed for grinding under inert gases such as nitrogen or argon.

The SD Attritor is also used to make dispersion-strengthened metal (DSM). In this process (known as mechanical alloying or cold welding), the kinematic porosity results in the grinding media breaking the metals into small particles and beating them together to form agglomerates. By repeating the process, the various metals are evenly mixed and dispersed to form a new composition of alloy (DSM).

Union Process SD Dry Grind Attritors are ruggedly built machines with specially designed, two-speed, high starting torque motors. They are also equipped with jacketed, stainless steel tanks and tilting mechanisms for ease of cleaning and maintenance.

SD SERIES Features and Options:

• All eight models can be outfitted to operate in either batch or continuous mode.
• All models equipped with ammeter.
• When metal contamination must be eliminated, tank liners and arm sleeves of tungsten carbide or various ceramics can be applied.
• Cover seals can be provided for conditions where dust control is desired, or where grinding must be done under a closed inert gas system.
• Torque meter is available including torque and speed sensor read-out.
• Media discharge valves can also be installed.
• Variable frequency drives and controls are available.

SDL-50 Special cover with brush seal and vent and metering discharge valve assembly. 75 HP, variable frequency drive, TEFC electricals. CE Marked.

SD-30 Sealed cover with ceramic-lined tank, zirconium oxide sleeved arms, and actuated discharge assembly. Explosion-proof electricals.

 

ENGINEERING DATA
ATTRITOR MODEL	SD-5	SD-10	SD-15	SD-30	SD-50	SD-100	SD-200	SD-250
Gross Tank Volume (gals)	9	16	24	52	81	155	255	288
Material Capacity (gals)	2-3	4-6	5-7	10-18	15-25	30-50	60-100	75-125
Media Volume (gals)	5	9	12	25	37	75	150	187
HP*	5-10	10-20	15-25	25-60	40-75	60-125	125-200	150-200
Height (H)	79"	83"	86"	96"	104"	114"	126"	136"
Floor Space (W x D)	34"x 68"	59"x41"	59"x41"	66"x44"	74"x48"	84"x58"	94"x64"	106"x68"
Machine Weight (lbs) w/o media	2000	2400	2800	3500-5500	4500-6000	5600- 7900	11,000- 14,000	14,000- 16,000
Various types of ceramice linings are available for all models. *For ceramic media, less horsepower is required. Equipment can be built to CE specifications, if required.

How Continuous or Batch Dry Grinding Attritors Work

Dry Grinding Attritors can be operated in Continuous or Batch operation. For a complete explanation of how Dry Grinding Attritors work in both Continuous and/or Batch operation, please download the Technical Paper “Attrition Dry Milling in Continuous and Batch Modes”.

Download PDF (236 KB PDF)

HSA Series

The HSA High Speed Attritor is generally used in a continuous mode. The material is charged into the mill at the top and is discharged out the bottom side, making use of centrifugal force. The HSA is used when smaller particle size (generally 40 mesh) materials are fed into the machine and micron size end product is desired.

Also, it is often used for fibrous and polymer types of materials.

HSA Attritors feature a patented design concept that includes a unique grinding tank internal configuration which allows higher shaft speeds, finer grinding, and continuous operation with side discharge.

A series of specially shaped agitating arms and diverter discs are mounted along the longitudinal axis of the agitator shaft. This engineering design makes it possible to use smaller grinding media, operate at higher shaft RPM, and increase residence time of the material to be processed to insure a finer grind.

HSA SERIES Features and Options:

• Fully integrated system
• Stainless steel grinding chamber
• High speed, high volume production
• Equipped with ammeter
• Fully jacketed grinding tank temperature control
• T.E.F.C. or explosion-proof electricals available
• Efficient side discharge
• Can be equipped with a metering pump for grinding aid
• Exceptionally fine grinding

Common Applications for Attritors

• Ceramic Powders
• Glass frits
• Metal powders
• Mechanical alloying
• Metal oxides
• Fibers and cellulose
• Food products
• Ferrite
• Pigments
• Minerals
• Coal and coke
• Graphite
• Plastics and rubbers
• Chemicals

HSA-30

HSA-100

 

ENGINEERING DATA
ATTRITOR MODEL	HSA-10	HSA-20	HSA-30	HSA-50	HSA-100
HP	20	40	50	75	150
Gross Tank Volume (gals)	10.3	18.7	28.6	43.4	85.0
Media Volume* (gals)	3.8	7.6	11.4	19.0	38.0
Height (H)	87"	89"	91"	99"	113"
Floor Space (W x D)	65"x32"	73"x34"	76"x35"	91"x46"	98"x50"
Discharge Height (X)	21"	16"	13"	16"	16"
Machine Weight (lbs) w/o media	2600	3300	3700	5100	7400
*May vary depending on application. Equipment can be built to CE specifications, if required.