Product category:
Powder and Solids Handling
News Release from: Schenck Process GmbH | Subject: MechaTron Feed System
Edited by the Processingtalk Editorial
Team on 03 October 2005
MechaTron feed system updated at cement
plants
After a new European Parliament directive, over 350 cement plants throughout the European union had to be upgraded to the latest state of the art on or before the end of 2004
According to European Parliament Directive 2003/53/EC, in force since 17 January 2005, cement and cement-containing preparations after hydration can feature a maximum of soluble chrome-VI of 0.0002% (2 ppm) in the oven-dry mass When in contact with human skin for a long period of time, chrome-VI can cause severe allergic reactions, the so-called chromate dermatitis
This article was originally published on Processingtalk on 3 Jul 2006 at 8.00am (UK)
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In Germany, over 300 people a year are affected by this syndrome, particularly masons and tilers.
Iron-II and tin-II sulphates are particularly suitable for reducing the amount of chrome in the cement.
Combined with reducing agents and water, chromate-VI is converted into an insoluble chromate-III hydroxide harmless to the skin.
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The reaction is CrO4-- + 3Fe++ + 4OH- + 4H2O = Cr(OH)3 + 3Fe(OH)3.
The optimal solution involves switching to the Schenck MechaTron feeder.
Before the change-over took place, many cement plants were equipped with.
* Compact weigh units, VKN type.
* Measuring eyes, DMA type.
* Ring-torsion load cells, RTN type, for hopper weighing.
* Multidos weighfeeders.
* Multicor mass flow feeders operating on the Coriolis principle.
* DFT road weighbridges for weighing the truck below the cement silo.
The Multidos weighfeeder for the cement industry, for instance, is designed to cope with feed rates between 0.5 and 600 t/hr.
To meet the requirements of Directive 2003/53/EC it was necessary to add 0.3 to 0.5% tin sulphate/Fe(II) sulphate, related to the total amount fed.
A product change was required.
Among the numerous products in the continuous weighing system range offered by Schenck, the MechaTron features the whole gamut of requisite properties - up to the highest degree of flexibility.
In accordance with bulk solids characteristics and nominal feed rate requirements, different MechaTron variants are employed.
For the sluggish Fe(II) sulphate, Schenck specialists recommend the use of the Coni-Flex variant.
For the extremely sluggish and slightly adhesive tin sulphate, Coni-Steel is the system of choice.
The two variants differ by the material agitation system employed.
Coni-Flex is equipped with a flexible discharge hopper.
Paddles attached to the side massage the hopper wall so that bridges are destroyed and mass flow in the hopper is ensured.
If the material tends to build up on hopper walls, an agitation system in the surge hopper is required, ie our Coni-Steel variant equipped with internal agitator.
Depending on the feed rate, four series are available, comprising feeders for rates from 0.2 dm3/h to 32 m3/h, that can be used for volumetric and gravimetric applications.
For material change, the MechaTron allows all parts in contact with the product to be dismantled and mounted from the service side.
All steps for removal of the feeding unit and feed hopper can be performed by a single person with utmost ease.
This helps to reduce cleaning and shutdown times, thus cutting the operating cost.
On every MechaTron feeder, the Disocont weighing electronics, comprising system unit and optional extensions, are integrated into the mechanical feeder system.
Thanks to its modular design, the individual units can be combined and optimised with regard to application and cost.
The Disocont internal communication bus permits the I/O modules to be arranged flexibly.
All components can be replaced by plug and play with no need for re-calibration and re-configuration.
The MechaTron solution excels through minimum space requirements, reduced cabling, low investment cost and easy servicing.
When mounted in potentially explosive atmospheres, the electronics can be mounted in a control cubicle using conventional techniques.
The MechaTron feeding system can be used for any commercial reducing agent.
With an installed base of more than 450 feeders and complete plants, Schenck has impressively demonstrated its market leadership.
For many decades Schenck has been successfully represented world-wide in almost every cement plant.
In the cement industry, as well as in many other sectors, the company has made itself a name as a competent, reliable and committed system supplier and partner.
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