Any township board of such township is hereby authorized to levy not to exceed two (2) mills on each dollar of the assessed valuation of taxable property, real and personal, in any special fire protection district organized under the provisions of this act and also to certify authorized levy of taxes in such district to the county clerk of the county in which such township is located for collection of the taxes levied for such purposes. Such special levy shall be in addition to all other levies authorized or limited by law: Provided, That payment of such special levy of taxes for special purposes will not exempt such taxpayer from payment of general levy made throughout such township for fire protection purposes.