Purificationof Crude Sodium Chloride by Simple Economical Method for the Production of Table Salt

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.