Composition involving V sub 2 O sub 3 FeO-Sio sub 2 and process for making composition

Patent · Tue Apr 21 04:00:00 EDT 1992

OSTI ID:5132621

Muan, A; Najjar, M S

This patent describes a method of preparing a composition involving V{sub 2}O{sub 3}, FeO and SiO{sub 2} that is crystallized from a liquid with which the composition is in equilibrium on the liquidus surface and wherein the liquid has a composition that falls within a polygon shaped shaded area ABCDE as shown in the disclosed Figure for a ternary composition diagram of V{sub 2}O{sub 3}, FeO and SiO{sub 2}. It comprises heating V{sub 2}O{sub 5} powder having a particle size of less than about 50 microns in an atmosphere in which the partial pressure of oxygen is in the range of 10{sup {minus}5} to 10{sup {minus}10} atmosphere while gradually increasing the temperature over a temperature range of about 600{degrees} C to 1300{degrees} C and holding the final temperature for a period to ensure complete reduction of all vanadium to V{sup 3+}; heating Fe{sub 2}O{sub 3} powder having a particle size of less than about 50 microns for a period of about 10 to 14 hrs. at a temperature in the range of about 1400{degrees} C to 1450{degrees} C whereby substantially all of the Fe{sub 2}O{sub 3} is converted into Fe{sub 3}O{sub 4}; heating SiO{sub 2} powder having a particle size of less than about 50 microns for a period of about 10 to 14 hours at a temperature in the range of about 1000{degrees} C to 1200{degrees} C; thoroughly grinding together an amount of V{sub 2}O{sub 3} from in the range of about 25 to about 98 wt. %, with an amount of Fe{sub 3}O{sub 4} from in the range of more than 0 to about 50 wt. %, and with an amount of SiO{sub 2} from in the range of about more than 0 to about 43 wt. % to produce a mixture having a grain size of less than about 50 microns, pelletizing the mixture from (4) at a pressure of about 5,000 psi.

• Assignee: Texaco Inc., White Plains, NY (United States)
• Patent Number(s): US 5106811; A
• Application Number: PPN: US 7-590745
• OSTI ID: 5132621
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
CHALCOGENIDES
CHEMICAL COMPOSITION
CHEMICAL PREPARATION
DIAGRAMS
EQUILIBRIUM
HEAT TREATMENTS
IRON COMPOUNDS
IRON OXIDES
OXIDES
OXYGEN COMPOUNDS
PARTICLE SIZE
PHASE DIAGRAMS
POWDERS
SILICON COMPOUNDS
SILICON OXIDES
SIZE
SYNTHESIS
TEMPERATURE RANGE
TEMPERATURE RANGE 0400-1000 K
TEMPERATURE RANGE 1000-4000 K
TRANSITION ELEMENT COMPOUNDS
VANADIUM COMPOUNDS
VANADIUM OXIDES