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PrintThe german company RW silicium GmbH, is a manufacurer of metallurgical silicon. The silver coloured semi-metal is generated in a process whereby quartz and carbon are converted in electric arc furnaces. It is used in the Chemical Industry as a basic element for silicione chemistry, microelectronics and solar energy and furthermore it is utilized as an alloying metal in aluminium foundries.
Amorphous silicon dioxide (mikrosilica) is also obtained as a by-product during the manufacturing process. The so-called RW-Filler is used either as an uncompacted, high-grade microfiller - or compacted as RW-Compasil - in ceramic and refractory products and fibre-cement.
RW silicium GmbH today has about 110 employees.
| 1947 | The Vereinigte Aluminiumwerke (VAW) get the permission to produce Ferrosilicon (FeSi 45/ 75/ 90), which is needed in steel production. |
| 1948-1951 | Start-up of three Ferrosilicon-furnaces with a total load of 17 MW. |
| 1955 | Extension of the furnace building and start-up of a 4th furnace. |
| 1969 | The production is more and more changed to Silicon-Metal. |
| 1976 | Start-up of a filter baghouse to clean the off-gases (production of Silica-Fume) with a capacity of 800.000 m?/h. |
| 1995-1996 | Start-up of two casting machines for Silicon-Metal. The high grade product "Silcocast" is selled to the Chemical Industry for the production of silicones. |
| 1997 | Installation of tap hole de-dusting units to collect the fine dust. |
| 1998 | Change from VAW aluminium AG to Graphit Kropfm黨l AG on October 1st. |
| 1999 | Start-up of a second baghouse with 400.000 m?/h. Increase of the production from 20.000 to 26.000 metric tons per year. |
| 2001 | Start-up of two automatic raw material preparation plants. |
| 2002 | The production of "RW-Filler Q1" takes the demands of high grade Microsilica. Increase of the storage capacity for 250m?. |
| 2004 | Improvement of the metal-transport by increasing of the size of casting laddles. |
| 2008 | Comissioning of another baghouse filter with 400.000 m?/h capacity. |
| 2009 | Revamping of furnace No. 4 with new electrode system. |
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- [Editor:Yueleilei]
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