Reuters reports imports of alumina fell 14.3% to hit a record low of 60kt in July due to high international prices and sufficient domestic supply, data from the General Administration of Customs showed.
China previously was one of the world's top alumina importers, but it has increased production and can cover more than 90% of the demand.
The world's top aluminium consumer exported 82,023t of primary aluminium and alloys in July, a rise of 38.6% from June 2011 and up 19.2% from July 2010 due to high alloy exports.
Aluminium alloys do not carry an export tax as long as they are made from imported materials. But the primary metal is subject to a 15% export tax.