Importing records of SQL Type nText to AX

Hi! We are migrating many tables into AX2009 as part of a mayor merging project. The performance of the data import is so much better for csv files compared to EXCEL, that we are trying to do it by csv whenever it is possible. Unfortunately we noticed that importing columns of type nText from the SQL database we are losing the carriage returns when loading the data in csv format. Does anybody knows how to handle this issue? We are currently importing 300’000 records from Excel and the process so far took 24 hours. Any suggestions on how to improve or solve this case?