A competing process, referred to as the " Silicol Process ", reacted Ferrosilicon with a strong Sodium hydroxide solution and had the advantage of flexibility.
32.
It is an ultrafine powder collected as a by-product of the silicon and ferrosilicon alloy production and consists of spherical particles with an average particle diameter of 150 nm.
33.
All correct mediums are kept at the correct density using a set of densifiers, supplemented by low intensity wet magnetic separators ( LIMS ) removing ferrosilicon from the dilute medium.
34.
Elemental silicon is added to molten cast iron as ferrosilicon or silicocalcium alloys to improve performance in casting thin sections and to prevent the formation of cementite where exposed to outside air.
35.
The Pidgeon process is a batch process in which finely powdered calcined dolomite and ferrosilicon are mixed, briquetted, and charged in retorts made of nickel-chrome-steel alloy.
36.
Silica fume on the other hand, is a very fine pozzolanic, amorphous material, a by-product of the production of elemental silicon or ferrosilicon alloys in electric arc furnaces.
37.
Additions to the molten iron such as ferromanganese, ferrosilicon, Silicon carbide and other alloying agents are used to alter the molten iron to conform to the needs of the castings at hand.
38.
Ferrosilicon is primarily used by the iron and steel industry ( see below ) with primary use as alloying addition in iron or steel and for de-oxidation of steel in integrated steel plants.
39.
Ferrosilicon production and use is a monitor of the steel industry, and although this form of elemental silicon is grossly impure, it accounts for 80 % of the world's use of free silicon.
40.
Most elemental silicon produced remains as a ferrosilicon alloy, and only about 20 % is refined to metallurgical grade purity ( a total of 1.3 1.5 million metric tons / year ).
