The Development of A Technology for the Purification of Sodium Chloride by Removing Impurities Using the Phosphate Method

Sodium chloride is widely used in medicine, food production, and chemical industry. One of the main requirements in any of these fields is the purity of the product.

NaCl can be purified to any desired level, but there is a cost associated with this, which is added to the cost of the raw material. The aim of the paper is to provide purification in the most practical way. The paper addresses the purification of table salt through the desliming of rock and the separation of the insoluble residue. It also describes the separation of impurity ions of calcium and magnesium, which are formed by interaction with sodium phosphate, into a solid phase from a saturated NaCl solution. The suspension is then settled through the separation of precipitated impurities, and the clarified solution is dried in a spray dryer to obtain the finished product.

Processing of halite ore from the Bakhyt-tany deposit, IR, SEM and spectrometric analysis methods.

The optimal ratio of the liquid and solid phases of the system during mixing was determined, as well as the optimal mixing time. The stoichiometric ratio for the cleaning reagent, sodium phosphate, was determined to achieve a maximum degree of purification from magnesium and calcium ions of 99%.

The data obtained has enabled the preparation of a technological scheme for the cleaning of sodium chloride by the phosphate method.