Extracting materials from finished products should be a very complex process. Even modern industry needs to undergo a lot of trouble and multiple treatments to achieve this, and it's not something that can be solved with just a forging furnace.
But in the fantasy world, this isn't a problem, the only issue is whether you can find a flame hot enough to smelt a divine artifact level trident.
The Nanming Li Fire here happens to meet this standard. Watching the trident slowly melt, Zhao Changhe grew even more certain, thinking that this fire is indeed stronger than the Vermilion Bird. This flame still comes from a very distant source; he couldn't imagine what it would be like at its core... The trigger for Vermilion Bird's breakthrough might likely be found here.
Under the enhancement of Xuanwu's forging skill, as long as you can melt the metal, it will automatically separate the materials.
However, Zhao Changhe found that he still couldn't escape the eye behind him.