Iron, on the other hand, is a very different beast. The carbon monoxide trick works just as well with iron, but the relevant working temperatures of iron are way higher than with copper. Which means that you need a more advanced furnace to work with iron. However, the melting point of iron is higher than the melting point of its impurities, so you can't use the same trick you can with copper to purify it. Instead what you have to do is hold iron at around its welding temperature, and you melt the impurities within the iron. What you end up with is an iron "sponge" (or bloom) that you then remove from the furnace and beat with hammers to squirt out all the remaining molten impurities. Worse yet, cast iron is not a particularly good material in comparison to cast bronze, especially for tools and weapons. The proper way to make tools from iron is to make steel, and to forge it (heating it and beating it with hammers and other implements into shape). There are yet additional complexities involving quenching and cooling that can greatly affect the material properties of forged steel. All of these things are very much unlike bronze working and also require a lot of non-obvious steps to improve the process from one step to the next.

All of which is why the bronze age lasted for such a long time, even though some elements of iron working were known (from, for example, working with meteorites). The big advantages of iron working are that the materials (iron ore, etc.) are fairly common everywhere if you know where to find them (compared to the rarity of tin) and iron/steel implements can be mended and recycled extremely easily, even in the field.

As a side note, Tutankhamun is an interesting figure largely due to his father, Akhenaten, who completely upset the entire Egyptian religious system. Akhenaten demanded that the egyptians worship him directly, and he in turn worshiped the god Aten, forsaking all other gods in the egyptian pantheon. This was a big deal due to the importance of the religious bureaucracy at the time, among other reasons. When Tutankhamun (originally Tutankhaten) came to rule after his father's death he restored the old ways, including the importance of the religious establishment. It's thought by many that king tut's lavish funeral gifts are in large part from the religious order, as a thank you to bringing them back to prominence and power.