Usage
NOGAS briquettes are convenient to apply and most effective in removing dissolved hydrogen from molten copper and its alloys. A compacted degassing briquette is plunged beneath the metal surface to release a stream of scavenging gases from the decomposition which ensues. The scavenging gases do not produce any objectionable or toxic fumes and the only equipment required is a suitably protected plunger rod.
NOGAS is supplied as strong, robust briquettes that can be safely and easily stored, handled and applied.
Degassing with NOGAS briquettes can be carried out in the furnace in the case of lift-out, tilting and high frequency furnaces. For larger units it is recommended that degassing should be carried out in the transfer ladle.
The NOGAS briquettes are so designed that they can be attached to or wedged on, to a variety of plunger rod shapes, etc. Perhaps the most suitable tool is a simple steel rod, furnished with a peg or stop to prevent the briquette riding up the rod, when plunged into molten metal.
The briquette may also be wired to a suitable plunger made from either steel or graphite or, if a suitable graphite rod is available, the end can be turned down into a cone shape and the briquette wedged on to it. This is the most satisfactory method since it leaves the largest surface area of the briquette exposed to produce the scavenging gases. For very large melts a dummy stopper rod is probably the best approach.
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