Methods of increasing the redox ratio of iron in a glass article

A method of producing an iron-containing glass article, comprising:

• melting in an overhead fired melter a batch of glass-forming components having an iron source to provide molten glass, wherein the iron source includes ferrous iron silicate-containing material, wherein the batch includes 48 to 72 wt. % sand;
• 0.15 to 6.50 wt. % fayalite and 0.01 to 0.50 wt. % coal;
• processing the molten glass to provide a glass article having a predetermined iron redox value, and
• selectively altering the batch while maintaining the predetermined iron redox ratio of the glass article by reducing the amount of coal by about 0.8 pounds per 1000 pounds of sand for every 6.4 pounds of fayalite added per 1000 pounds of sand.

An iron containing glass batch, comprising:

• 48 to 72 wt. % sand;
• 14 to 28 wt. % soda ash;
• 0 to 19 wt. % of dolomite;
• 0 to 15 wt. % of limestone;
• 0.1 to 2.30 wt. % of sulfate;
• 0.91 to 6.5 wt. % of a ferrous iron silicate source.

A method for preparing a ferrous iron containing float glass composition comprising:

• forming a batch of glass-forming components comprising a ferrous-containing iron source selected from the group consisting of iron garnet, magnesium iron olivine, grunerite, actinolite and iron anthophyllite and any combination thereof with and without fayalite;
• melting in a overhead fired melter the batch of glass forming components;
• and
• refining the resultant melt to obtain a finished flat glass composition comprising 0.5 to 2 percent by weight total iron.

An iron containing glass batch, comprising:

• 48 to 72 wt. % sand;
• 14 to 28 wt. % soda ash;
• 0 to 19 wt. % of dolomite;
• 0 to 15 wt. % of limestone;
• 0.1 to 2.30 wt. % of sulfate;
• 0.15 to 6.5 wt. % of a ferrous iron silicate source wherein the ferrous iron source is selected from the group consisting of iron garnet, magnesium iron olivine, grunerite, actinolite and iron anthophyllite and any combinations thereof with and without fayalite.

An iron containing glass batch, comprising:

• 48 to 72 wt. % sand;
• 14 to 28 wt. % soda ash;
• 0 to 19 wt. % of dolomite;
• 0 to 15 wt. % of limestone;
• 0.1 to 2.30 wt. % of sulfate;
• 5.1 to 6.5 wt % of a ferrous iron silicate source.