Abstract:
The crude sodium chloride in Sudanese market’s is highly
contaminated with undesirable contaminants which make it
un conformative with the international standards for table salt.
Random samples were collected from the market and
wereanalysed . The result revealed high contamination with
SO₄²ˉ, Ca²+, Mg²+, and the moisture content was also found to
be high, in addition to insoluble matter.
To get rid of these contaminants the crude salt was washed by
brine solution which dissolves the contaminants, but not the
sodium chloride. As a result the percentages of impurities were
lowered ie. SO₄²ˉfrom 0.5 % to 0.3 % and Ca²+ from 0.28% to
0.12% and Mg ²+ from 0.52% to 0.21%. Matter insoluble from
1. 30 %to 0.01% this resulted is increasing the percentage
ofsodium chloride 96.5% to 99.1% this simple economical
method produced table salt which satisfies the requirements of
the standards.
