What is the cost of extracting silver from photographic waste liquid?

Will be high, because it is not worth it.

Its main component is silver nitrate. The way to extract silver is to use other metals, which are probably cheaper and richer in raw materials, but there is almost no silver nitrate in the waste liquid, so on the one hand, a lot of waste liquid is needed, and on the other hand, a lot of iron is needed to exchange a small amount of silver. Moreover, there are technical conditions. The general feeling is that unless you have very good conditions, it is better to buy silver directly in RMB.