| dc.description.abstract | Aluminum is one element in nature that is very much usefulness to humans. Aluminium
bar (ingot) aluminium molding is obtained from liquid (molten). Raw materials used
include alumina (Al2O3), anode, cathode, kliorit (Na3AlF6), soda ash (Na2CO3) and
aluminum fluoride (AlF3). Generated a lot of aluminum bars contain impurities, such as
Fe and Si. Because of iron (Fe) can cause corrosion (rusting), while the element silicon
(Si) causes the aluminum color to yellow. When levels of iron and silicon in aluminum so
there are a lot shall be controlled by way of re-stirring (stirring again), the addition of
molten, partially molten molding (speak out), and a decrease in grade. Results of
observations made it was found that aluminum produced at PT INALUM still the
standard that is applied in PT INALUM, namely for S1-B grade aluminum with purity
levels of 99.90%, and grade G1 with 99.70% purity aluminum. | en_US |
