wat are the main uses of aluminium

Answer 1

Here are the apparent uses:
http://sam.davyson.com/as/physics/aluminium/siteus/uses.html
I would add to that the use of Aluminum in the chemical industry, aluminum is a component of many widely used chemicals.

http://ntp.niehs.nih.gov/index.cfm?objectid=03DBC94E-AF52-C4FC-D5AA9BD2A7E6AE7F