Is it permissible to pay off part of a usurious loan with usurious interest obtained from the same bank?

It is not permissible to benefit from the usurious interest you obtained from the bank, neither by consuming it nor by paying it to the bank to settle your debt. Rather, you must dispose of it by spending it on the welfare of Muslims and giving it to the poor and needy. You must also repent to Allah and cease dealing with usurious banks.