Reduction of nickel sulfide stones in a glass melting operation

Details Reduction of nickel sulfide stones in a glass melting operation Reduction of nickel sulfide stones in a glass melting operation

C - Chemistry, Metallurgy

03

B

C03B 5/225 (2006.01) C03C 1/00 (2006.01) C03C 3/087 (2006.01)

Patent

CA 2129086

Material selected from the group consisting essentially of molybdenum, arsenic, antimony, bismuth, copper, silver, potassium dichromate and iron chromite, is added during the manufacture of soda-lime-silica float glass to reduce the occurrences of nickel sulfide stone defects. Material is added in sufficient amounts such that the resulting glass is at least 0.010 wt. % of the selected material. In a preferred embodiment of the invention, molybdenum is added in the form of sodium molybdate such that the resulting glass is at least 0.015 wt. % molybdenum.

Des matières premières sélectionnées dans le groupe constitué essentiellement du molybdène, de l'arsenic, de l'antimoine, du bismuth, du cuivre, de l'argent, du dichromate de potassium et du chromite de fer sont ajoutées pendant la fabrication du verre flotté sodo-calco-silicaté afin de réduire la présence de particules indésirables de sulfure de nickel dans le verre. Ces matières sont ajoutées en quantités suffisantes pour que le verre résultant en contienne au moins 0,010 %, en poids. Dans une version privilégiée de l'invention, du molybdène est ajouté sous forme de molybdate de sodium de sorte que le verre résultant est constitué d'au moins 0,015 %, en poids, de molybdène.

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