REMOVAL IMPURITIS GARAM DENGAN METODE PERTUKARAN ION SECARA BATCH

Abstract

Salt is one of the consumer and industrial consumption products that has the main
content of sodium chloride (NaCl). The present quality of the salt product currently
contains about 90-93% sodium chloride, and the other is known as an impurities of
calcium (Ca), magnesium (Mg), potassium (K) and sulfate (SO4) ions. The presence of
these impurities will decrease the quality of the salt product, so a method is needed to
decrease the content of impurities in the salt product. One of the methods that can be
used to reduce the levels of impurities such as Ca, Mg, K, and sulfate (SO4) ions in salt
solution is ion exchange method. In this study we studied the effect of cation resin
amount (50-150) grams per liter of salt solution and anion solution (150 grams) and
contact time (5-25) minutes on removal of Ca, Mg, K and SO4 ions. The study was
conducted in a stirred tank with a fixed rotation speed of 200 rpm, and the initial quality
of the salt solution contained Ca ions: 0.07%, Mg: 0.09%, K: 0.04% and SO4: 0.4%.
Based on the result of the research, the removal of Ca ion: 93.6%, Mg: 78.93%, K:
25.00% dan SO4: 85.47 % at condition of cation resin amount: 150 gram/liter and
contact time 25 minutes.