* China imported 100 mln T of iron ore in January
* Just below the record 102.8 mln T in September
* Mills replenished inventories ahead of holiday, lifting of curbs (Adds analyst comments, details)
SHANGHAI, Feb 8 (Reuters) - China's iron ore imports jumped to the second highest level on record in January as the world's top buyer built stockpiles ahead of the Lunar New Year holiday and the lifting of steel production curbs next month.
Shipments of the steelmaking raw material in January climbed 19 percent from December to 100 million tonnes, customs data showed on Thursday.
The January number was just below the record 102.8 million tonnes that arrived in September. It was also up from 91.99 million tonnes that arrived in January last year.
Analysts had expected a rebound in iron ore shipments last month, given December's imports of 84.14 million tonnes had come in well below estimates.
"There's also strong demand, restocking before the holiday and some mills were also preparing for restarts after the winter season," said Wang Di, analyst at CRU in Beijing.
China is set to lift steel production curbs across 28 cities in mid-March as the winter heating season ends. Beijing imposed the restrictions from November as part of its campaign to fight air pollution.
January's import number was not too far above the 93.7 million tonnes recorded for the month on Thomson Reuters ship-tracking data, underlining efforts of mills to replenish inventories.
Bai Jing, analyst with Galaxy Futures, said iron ore traders booked shipments in October for January shipments.
"It's because supply was seasonally tighter in the first quarter and on expectation that steel mills would resume production in March," said Bai.
China's iron ore imports rose to a record 1.075 billion tonnes in 2017, exceeding 1 billion tonnes for a second year. (Reporting by Ruby Lian and Manolo Serapio Jr.; Editing by Kenneth Maxwell and Richard Pullin)