Method of making glass including use of boron oxide for reducing glass refining time
This invention relates to a method of making soda-lime-silica based glass. In certain example embodiments, boron oxide (e.g., B 2 O 3 ) is used in the glass for reducing the refining time (or increasing the refining rate) thereof. The boron oxide may be introduced into the glass batch or melt in the form of boric acid, sodium tetraborate pentahydrate, sodium tetraborate decahydrate, sodium pentahydrate, or in any other suitable form. In certain example embodiments, the resulting soda-lime-silica based glass ends up including from about 0.1 to 3%, more preferably from about 0.1 to 2.5%, and most preferably from about 0.5 to 2.0% (e.g., about 1%), boron oxide. It has been found that the use of boron oxide, and/or the form in which the same is introduced into the glass, is advantageous in that it permits the refining time of the glass to be substantially reduced.
1 . A method of making soda-lime-silica based glass comprising a base glass portion that includes:
Ingredient
wt. %
SiO 2
67-75%
Na 2 O
10-20%
CaO
5-15%
Al 2 O 3
0-7%
K 2 O
0-7%
the method comprising:
providing boron oxide in a glass melt used in making the glass, the boron oxide acting to reduce refining time of the glass melt; and
increasing a pull rate and/or reducing residence time of the glass melt in a refining zone of a glass manufacturing apparatus, compared to a situation where no boron oxide is present.
2 . The method of claim 1 , wherein the boron oxide is provided in the glass melt in an amount sufficient so that the final glass made using the melt includes from about 0.1 to 3% boron oxide.
3 . The method of claim 1 , wherein the boron oxide is provided in the glass melt in an amount sufficient so that the final glass made using the melt includes from about 0.5 to 2.0% B 2 O 3 .
4 . The method of claim 1 , wherein the boron oxide is provided in the glass melt in an amount sufficient so that the final glass made using the melt includes from about 0.75 to 1.25% B 2 O 3 .
5 . The method of claim 1 , wherein the boron oxide is introduced into the glass melt and/or a glass batch for the melt in a form of boric acid.
6 . The method of claim 1 , wherein the boron oxide is introduced into the glass melt and/or a glass batch for the melt in a form of sodium tetraborate pentahydrate or sodium tetraborate decahydrate.
7 . The method of claim 1 , wherein the boron oxide is introduced into the glass melt and/or a glass batch for the melt in a form of sodium pentahydrate.
8 . The method of claim 1 , further comprising providing Epsom salt in the glass melt and/or a batch for the melt so as to reduce the refining time.
9 . A method of making soda-lime-silica based glass, the method comprising:
providing boron oxide in a glass melt used in making the soda-lime-silica based glass, in order to reduce refining time of the glass melt.
10 . The method of claim 9 , wherein the boron oxide is provided in the glass melt in an amount sufficient so that the final glass made using the melt includes from about 0.1 to 3% boron oxide.
11 . The method of claim 9 , wherein the boron oxide is provided in the glass melt in an amount sufficient so that the final glass made using the melt includes from about 0.5 to 2.0% B 2 O 3 .
12 . The method of claim 9 , wherein the boron oxide is provided in the glass melt in an amount sufficient so that the final glass made using the melt includes from about 0.75 to 1.25% B 2 O 3 .
13 . The method of claim 9 , wherein the boron oxide is introduced into the glass melt and/or a glass batch for the melt in a form of boric acid.
14 . The method of claim 9 , wherein the boron oxide is introduced into the glass melt and/or a glass batch for the melt in a form of sodium tetraborate pentahydrate or sodium tetraborate decahydrate.
15 . The method of claim 9 , wherein the boron oxide is introduced into the glass melt and/or a glass batch for the melt in a form of sodium pentahydrate.
16 . The method of claim 9 , further comprising providing Epsom salt in the glass melt and/or a batch for the melt so as to reduce the refining time.