Method for controlling foam production in reduced pressure fining
First Claim
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1. A method for controlling the foam produced when a molten material encounters reduced pressure in a vacuum chamber, comprising:
- passing the molten material through an aging zone in the vacuum chamber, wherein the molten material is allowed to drain from between the bubbles of the foam; and
breaking the bubbles of the drained foam.
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Abstract
A method for controlling the foam produced when a molten material encounters reduced pressure in a vacuum chamber includes passing the molten material through an aging zone in the vacuum chamber in which the molten material is allowed to drain from between the bubbles of the foam and then collapsing the bubbles of the drained foam.
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Citations
14 Claims
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1. A method for controlling the foam produced when a molten material encounters reduced pressure in a vacuum chamber, comprising:
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passing the molten material through an aging zone in the vacuum chamber, wherein the molten material is allowed to drain from between the bubbles of the foam; and
breaking the bubbles of the drained foam. - View Dependent Claims (2, 3, 4)
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5. A method for controlling the foam produced when a molten material encounters reduced pressure in a vacuum chamber, comprising:
allowing the foam to flow from the vacuum chamber into a foam chamber separate from the vacuum chamber. - View Dependent Claims (6, 7, 8, 9)
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10. A method for controlling the foam produced when a molten material encounters reduced pressure in a vacuum chamber, comprising:
allowing the molten material to flow into the vacuum chamber through an inclined conduit, wherein bubbles in the molten material collect at a surface of the conduit. - View Dependent Claims (11)
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12. A reduced pressure finer, comprising:
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a finer chamber having a pressure below atmospheric pressure;
a first conduit for conducting molten material to the finer chamber, the first conduit being inclined to the vertical, wherein the bubbles in the molten material collect at a surface of the first conduit as the molten material flows through the first conduit; and
a second conduit for removing the molten material from the finer chamber. - View Dependent Claims (13, 14)
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Specification