Product category:
Mixers, Blenders, Grinders and Mills
News Release from: Cyclotec | Subject: Ultra fine grinding machine
Edited by the Processingtalk Editorial
Team on 26 June 2006
Ultra fine grinding machine developed
for 120 yrs
Cyclotec, an engineering team from St Peterburg in Russia, has developed an innovative ultra fine grinding machine - based on a US patent dating from 1886!!
Cyclotec an engineering team from St Peterburg in Russia has developed an innovative ultra fine grinding machine - based on a US patent dating from 1886!! This technology, says Ezry Akkerman, marketing director of Cyclotec, is the most cost effective large scale production method for ultra fine and sub micron powders This technology will play a key role in the development and production of innovative materials in the 21st century
This article was originally published on Processingtalk on 12 Oct 2004 at 8.00am (UK)
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New technology has been developed in an effort to improve the production process of superfine powders, introducing a practical planetary centrifugal mill!
According to Cyclotec, the PCM operates on a principle similar to a ball mill.
In addition to rotation around a longitudinal axis, the drum also rotates around an axis of the motion of transport (similar to the planets rotating around the sun).
The motion of transport "replaces" gravitational acceleration (G) acting upon the balls in the ball mill, with a centripetal acceleration of the motion of transport acting upon the balls in the PCM--and exceeding gravitational acceleration by 10 to 300 G.
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Problems that have so far hindered emergence of a commercial PCM include.1] Failure of planetary gear at high load high speed operation.
2] Complexity of design for continuous even feed and discharge of material.
3] Removal of excessive heat from the drums.
4] Provisions for dust removal.
The technology has potential for processing any material of mineral/ceramic origin, and would be well-suited for mobile applications.
The developers claim that it offers extended run times and is designed to significantly reduce energy consumption.
From a scientific perspective, Cyclotec claims an improvement for ground materials properties by reducing particle size to a molecular level, and by making the substance mechanically active.
Due to the energy intensity (which exceeds 2000 kW/m3 of grinding volume, compared to around 30 kWh/m3 in a ball mill), the mechanical activation effect causes significant acceleration of chemical and upgrading processes.
TECHNOLOGY ADVANTAGES.
Planetary Centrifugal mill technology enables control of two additional processing parameters, that will enable broader control of the grinding process.
1] Centrifugal speed (no critical speed limitation!).
2] Ratio of angular speeds.
These result in.
* Extremely Compact footprint (1.5 t/h capacity achieved in four drums five liter volume each!) with low weight (1.5 t/h model weights 1.2 tons).
* Significant energy saving: at least half the power draw in size ranges smaller then 400 mesh (Minus 20 micron class, silica sand milling, feed F80 500 micron, LESS THEN 50 kW/ton).
* Unmatched reduction ratio- (feed 5mm, product 20 micron class).
* Extended run tim (high speed, high efficiency planetary gear with planned life span), with low wear rate since there is no impact - milling is achieved by attrition.
* Ability to operate under superior centrifugal loads - no critical speed limitation.
* Simplicity of continuous even feed and discharge of the raw and ground materials.
* Simplicity of removal of the excessive heat and dust.
* No vibration - no need for foundations.
* Simplicity of the design - we practically have four ball mills united together- meaning simple production adaptation.
* Maintenance - easy and simple - complete disassembly and assembly takes six hours by one person (a liner change would require four hours, if there is a spare set of drums, 2 hours).
* Grinding Media charge ---- effortless and non stop grinding process.
* Autogenious Grinding - great potential for the realization of the technology of AG with various materials --- extremely low power draw comparing to existing grinding processes/technologies, eliminating contamination: the feed size capability in AG mode is up to 70 millimeters!! Drastic improvement in critical class limitation.
* Versatility- our PCM mill could be operated either in dry or wet grinding processes.
* Intense Mechanical activation (milled granite could be a partial cement substitute, milled slag could replace cement on a pound to pound basis, self ignition of stored milled coal).
* Practically immediate stabilisation of the grinding process (about one minute!).
* The design could be applied either in continuous or batch mode(for sub micron/nano applications).
* Potential for large scale production of sub micron product.
* Grinding process - We already provide milling services to local companies - demonstrations are possible anytime.
* Upscale capability 50 t/h - ultra fine mode,100 t/h in AG mode: Milled material is less than five microns and 30% of this material is less then one micron in size.
Surface area by BET 5.1m2/gr! (continuous action-- filter product after classification) Feed fraction 5mm (top size)!! (in ultra fine grinding mode with grinding media) (F80 2000 microns) -- Which means unmatched reduction ratio.
Energy consumption for silica sand (filter product after classification) for d97 is.
5 microns max 163 kWh/t.
10 microns max 103 kWh/t.
20 microns max 71 kWh/t.
30 microns max 58 kWh/t.
40 microns max 43 kWh/t.
50 microns max 40 kWh/t.
60 microns max 35 kWh/t.
70 microns max 28 kWh/t .
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