Differences between Extractors and Privacy Amplification for Quantum Random Generators

Question

We know that for the last step of QRNG: we need to separate quantum and classical noises from each other so we use extractors, after extractor we need privacy amplification step. At this point: if extractor is a strong extractor we can use it as a privacy amplification too. However I could not understand differences between extractor and privacy amplification. If I use the strong extractor for the second time, will I be able to complete my privacy amplification step? What will change in privacy amplification? If what happens, privacy amplification will be completed? Thanks