Rock Salt from salt
production methods
performed by Akram fresh water to dissolve salt in Rock Salt. Then pump the slurry was purified by adding NaOH solution with Na2CO3 to get rid of Ca2 + and Mg2 + in reaction
Mg2 + (AQ) + 2OH- (AQ) ® Mg (OH) 2 (s)
Ca2 + (AQ) + CO32- (AQ) ®. CaCO3 (s)
, then the precipitate formed is filtered out. Then the solution came NaCl crystals separate out the NaCl solution is decreased and the solution has Na2SO4 and Na2CO3 melt contaminated salt, which is undesired. The solution was "bitter water" solution to fill CaCl2 sufficient to eliminate ions of a substance CaSO4 and CaCO3 is insoluble equation
Ca2 + (AQ) + SO42- (AQ) ® CaSO4 (s)
Ca2 + (AQ. ) + CO32- (aq) ® CaCO3 (s)
separate NaCl solution was to crystallize out again.
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