Ferrochrome

Due to thek similarity to a-c furnaces, d-c furnaces can be substituted for neatly any a-c furnace including the open-arc, submerged-arc, and arc-resistance furnaces, provided that design criteria, particularly electrical parameters, are properly chosen. Currently, steel and ferrochrome is being made commercially in d-c furnaces and a siUcon metal pilot plant is being built. 

Uses. The sinter oxide form is used as charge nickel in the manufacture of alloy steels and stainless steels (see Steel). The oxide furnishes oxygen to the melt for decarburization and slagging. In 1993, >100, 000 metric tons of nickel contained in sinter oxide was shipped to the world s steel industry. Nickel oxide sinter is charged as a granular material to an electric furnace with steel scrap and ferrochrome the mixture is melted and blown with air to remove carbon as CO2. The melt is slagged, pouted into a ladle, the composition is adjusted, and the melt is cast into appropriate shapes. A modification of the use of sinter oxide is its injection directiy into the molten metal (33). 

Ferro-, ferrous, ferro-, ferroeo-, iron(II). -ammonsulfat, n. ammonium ferrous sulfate, -azetat, n. ferrous acetate, iron(II) acetate, -bor, n. ferroboron. -bromid, n. ferrous bromide, iron(II) bromide, -chlorid, n. ferrous chloride, iron(II) chloride, -chrom, n. ferrochrome, ferrochromium. 

Lignosulfonate freshwater muds contain ferrochrome lignosulfonate for viscosity and gel strength control. These muds are resistant to most types of drilling contamination due to the thinning efficiency of the lignosulfonate in the presence of large amounts of hardness and salt. 

The only important ore of chromium is chromite, FeCr2 O4. Reduction of chromite with coke gives ferrochrome, an iron-chromium compound FeCr2 04(.5 ) + 4 C(.5 ) FeCr2(.5 ) + 4 CO(g) Ferrochrome is... 

V. S. Kotelnikov, S. N. Demochko, V. G. Fil, and I. S. Marchuk. Drilling mud composition—contains carboxymethyl cellulose, acrylic polymer, ferrochrome lignosulphonate, cement and water. Patent SU 1829381-A, 1996. 

V. S. Kotelnikov, S. N. Demochko, M. P. Melnik, and V. P. Mikitchak. Improving properties of drilling solution—by addition of ferrochrome-lignosulphonate and aqueous solution of cement and carboxymethyl cellulose. Patent SU 1730118-A, 1992. 

Silicothermic reduction is also an important technique for the production of ferroalloys. The production of low-carbon ferrochrome and of ferrovanadium are carried out by this technique. The overall reaction for the reduction of vanadium pentoxide by ferrosilicon to yield ferrovanadium can be represented as... 

The electrowinning of aluminum, magnesium, sodium, and zinc and the electric furnace processing of ferrochrome and ferromanganese require large amounts of electrical... 

Simplex A process for reducing the carbon content of ferrochrome, an alloy of iron and chromium. Some of the alloy is oxidized by heating in air, and this is mixed in appropriate proportions with the remainder on heating the mixture in a vacuum furnace the carbon volatilizes as carbon monoxide. 

The final proof of the physical reality of our model of macromolecular adsorption was provided by simultaneous independent work, by an entirely different method, at the National Bureau of Standards (27). Stromberg et al., allowed polystyrene fractions, besides other polymers, to become adsorbed on ferrochrome plates and determined the thicknesses of the adsorbed layers... 

Chromium may be produced from high-carbon ferrochrome by electrolytic process. Alternatively, the metal may be obtained by electrolysis of chromic... 

Ferrochromium (Ferrochrome). An alloy composed principally of Fe Cr nsed as a means of adding Cr to steels, such as in manuf of stainless steels. The alloy is available in... 

Much heat is generated, and the mixture becomes white-hot. Indeed, thermite reactions have been used to generate intense heat as well as the reduced metal for certain welding applications. Chromium, however, is usually made by coke reduction of chromite (FeC CU) m the electric furnace. The product is ferrochrome, an Fe-Cr alloy, but this is acceptable if, as is often the case, the intention is to make stainless steel. 

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