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Primary Examiner: Garvin, Patrick P.
Assistant Examiner: Bell, Mark
Attorney: Ross; Karl F., Dubno; Herbert

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Title: Covering layer for metallic baths

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Claims: We claim:

1. A method of reducing metal loss from a molten brass bath to which scrap brass, e.g. chips and wire scraps, having a large surface area/volume ratio is added, comprising the steps of melting away from said bath components for a covering material consisting of:

10 to 70% by weight B.sub.2 O.sub.3

5 to 65% by weight SiO.sub.2 and

5 to 40% by weight of an alkali metal oxide selected from

the group which consists of Na.sub.2 O, K.sub.2 O and Li.sub.2 O to form a homogeneous molten alkali borosilicate glass;

solidifying said glass;

comminuting the solidified alkali borosilicate glass to a particle size less than 60 microns; and

depositing the comminuted homogeneous alkali borosilicate glass upon said molten brass bath by mixing it with the scrap introduced into said melt in an amount of 0.5 to 1.5% of the glass based upon the weight of the scrap added to the melt.

2. The method defined in claim 1 wherein said covering material consists of:

10 to 38% by weight Na.sub.2 O

10 to 70% by weight B.sub.2 O.sub.3 and

5 to 65% by weight SiO.sub.2.

3. The method defined in claim 1 wherein said covering material consists of:

20 to 40% by weight K.sub.2 O

10 to 70% by weight B.sub.2 O.sub.3 and

5 to 60% by weight SiO.sub.2.

4. The method defined in claim 1 wherein said covering material consists of:

5 to 30% by weight LiO.sub.2

20 to 70% by weight B.sub.2 O.sub.3 and

5 to 65% by weight SiO.sub.2.

5. The method defined in claim 1 wherein said covering material consists of:

20 to 70% by weight B.sub.2 O.sub.3

5 to 60% by weight SiO.sub.2 and

10 to 30% by weight of said alkali metal oxide.

Other info:

Inventors: Wunder, Wolf (Weisskirchen, DT)
Kohne, Volker (Montabaur, DT)
Hill, Rosolde (Nieder-Roden, DT)
Leogrande, Antonio (Werdohl, DT)

Application Number: 578945
Filing Date: 1975-05-19
Publication_date: 1976-08-24
Assignee: Vereinigte Deutsche Metallwerke AG (Frankfurt am Main, DT)
Primary Class(es): 75/709 75/313, 501/65, 501/77
Other Classes:
US Patent Ref:

943639	Dec, 1909	Rockey et al.	75/96.
1964321	Jun, 1934	Hood	106/54.
2106744	Feb, 1938	Hood et al.	106/54.
2466849	Apr, 1949	Hood	106/54.
2535536	Dec, 1950	Hagmaier	75/94.
3110399	Nov, 1963	Godron	106/54.
3144370	Aug, 1964	Bennett et al.	106/54.
3175937	Mar, 1965	Bayer et al.	106/54.
3748170	Jul, 1973	Michael	106/54.
3765205	Oct, 1973	Schaumberg	106/54.

Other Refs: Other References: "The Properties of Glass," 6. Morey 2nd Ed., Reinhold Publishing Co., N.Y. pp. 235, 250-257, (1954).