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- W1642006 abstract "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 sizemore » 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.« less" @default.
- W1642006 created "2016-06-24" @default.
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- W1642006 date "1992-04-21" @default.
- W1642006 modified "2023-09-27" @default.
- W1642006 title "Composition involving V sub 2 O sub 3 FeO-Sio sub 2 and process for making composition" @default.
- W1642006 hasPublicationYear "1992" @default.
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