Mark 9:49–50 (ESV) For everyone will be salted with fire. 50 Salt is good, but if the salt has lost its saltiness, how will you make it salty again? Have salt in yourselves, and be at peace with one another.”
Everyone WILL be purified. Either we will enter into the work of mortifying the deeds of the flesh here and now, or God will do such work in Hell.
In this regard it must be remembered, those who judge themselves now – will not suffer God’s judgment then. (see: 1 Corinthians 11:31)
And the purifying fires of Hell – whatever that purification looks like – will not result in salvation. Sin may be done away with – but unless guilt is removed in justification one remains forever guilty and forever subject to the just punishment for the unforgiven sin of this life.