Scrapy,
Not 100% on just what the cutting bits are in those cones..I don't know if they mix diamond in carbides or not for well drilling. The carbide buyer should be able to give you some info on what the bits usually are made from.
Those carbides "should" be brazed or silver soldered into the drill cones....but your mileage may vary. This means that to get the carbides out, you gotta get a fair bit of heat into the drill cone--get it up to a bright red with a rosebud tip on an oxyacetylene torch. And you need a way to grab the bits, which might be a bit of a challenge if the exposed surfaces are rounded. Some experimenting might be in order--maybe a small chisel to hammer down into the red hot metal beside the bit to give it a bit of upward urging. Especially if the drilling action has disturbed the steel around the bit and is crimped against it a little. Kinda like pulling a tooth!!
I'd hate to have to gouge each bit out with the torch--you'll spend enough on gas on just heating the cone to red hot, let alone excavating each bit out.
To sell used carbide, this far west in Canada I'd call up some of the big carbide suppliers, (who all should be in Alberta like dirty shirts to chase the oil business) and see what they offer for scrap carbide. Kennametal is one who comes to mind. Then compare with our SMF buyers, who are at a heck of a disadvantage with the border and being a long ways away. But you may be surprised. I know at least one scrap outfit in Calgary buys carbide but I don't know how competitive they are.
Let us know what you find out....and take photos!!!
Jon.
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