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Viscosity of BOF Slags Fluidized with Fluorspar, Colemanite, and Fused Boric Acid.

PB283879

Publication Date	1978
Personal Author	Kilau, H. W.; Spironello, V. R.; Mahan, W. M.
Page Count	30
Abstract	A major consumer of fluorspar is the steel industry. The increased use of fluorspar in this industry reflects the growing use of the basic oxygen furnace process, which has been replacing open hearth steel production. The basic oxygen furnace (BOF) fluorspar requirement averages about 12 pounds per ton of steel produced, compared with 4 pounds per ton for the open hearth process. The objective of the present Bureau of Mines work was to identify potential fluorspar substitutes by determining the viscosity-temperature profiles of BOF slags fluidized with the substitute materials and comparing them with profiles obtained with fluorspar. A high-temperature rotational viscometer was used to test basic oxygen furnace slags to determine fluorspar requirements and to evaluate colemanite and fused boric acid as substitute fluidizers. A continuous technique of viscosity measurement was adapted to better determine the viscosity-temperature profiles of volatile fluorspar slags. Criteria used for estimating slag fluidizer effectiveness were (1) the apparent solidification temperature, and (2) the temperature range of slag crystallization.
Keywords	Steel making Fluorite Substitutes Slags Borate minerals Boric acids Boron oxides Basic converters Oxygen blown converters Viscosity Strategic materials Availability Fluxes Colemanite Contingency planning
Source Agency	Bureau of Mines
NTIS Subject Category	48A - Mineral Industries 71J - Iron & Iron Alloys
Corporate Authors	Bureau of Mines, Twin Cities, Minn. Twin Cities Metallurgy Research Center.
Document Type	Technical Report
Title Note	Rept. of investigations.
NTIS Issue Number	197823

Viscosity of BOF Slags Fluidized with Fluorspar, Colemanite, and Fused Boric Acid.

Viscosity of BOF Slags Fluidized with Fluorspar, Colemanite, and Fused Boric Acid.
PB283879

Publication Date	1978
Personal Author	Kilau, H. W.; Spironello, V. R.; Mahan, W. M.
Page Count	30
Abstract	A major consumer of fluorspar is the steel industry. The increased use of fluorspar in this industry reflects the growing use of the basic oxygen furnace process, which has been replacing open hearth steel production. The basic oxygen furnace (BOF) fluorspar requirement averages about 12 pounds per ton of steel produced, compared with 4 pounds per ton for the open hearth process. The objective of the present Bureau of Mines work was to identify potential fluorspar substitutes by determining the viscosity-temperature profiles of BOF slags fluidized with the substitute materials and comparing them with profiles obtained with fluorspar. A high-temperature rotational viscometer was used to test basic oxygen furnace slags to determine fluorspar requirements and to evaluate colemanite and fused boric acid as substitute fluidizers. A continuous technique of viscosity measurement was adapted to better determine the viscosity-temperature profiles of volatile fluorspar slags. Criteria used for estimating slag fluidizer effectiveness were (1) the apparent solidification temperature, and (2) the temperature range of slag crystallization.
Keywords	Steel making Fluorite Substitutes Slags Borate minerals Boric acids Boron oxides Basic converters Oxygen blown converters Viscosity Strategic materials Availability Fluxes Colemanite Contingency planning
Source Agency	Bureau of Mines
NTIS Subject Category	48A - Mineral Industries 71J - Iron & Iron Alloys
Corporate Authors	Bureau of Mines, Twin Cities, Minn. Twin Cities Metallurgy Research Center.
Document Type	Technical Report
Title Note	Rept. of investigations.
NTIS Issue Number	197823