CLAIM:
1. A method of purifying a contaminated salt while recycling a working Solution
used in the purification, the method comprising the Steps of:
a) contacting the working Solution with the contaminated salt to obtain a salt slurry, wherein the contaminated salt comprises one or more contaminants and the working Solution comprises saturating concentrations of the salt dissolved in one or more solvents;
b) separating purified salt firom the salt slurry thereby obtaining a used working Solution comprising the one or more contaminants;
c) contacting the used working Solution with one or more reagents for removing hardness, heavy metals, or a combination thereof to obtain a reagent-treated used working Solution and a precipitate;
d) separating the precipitate firom the reagent-treated used working Solution;
e) adjusting pH of the reagent-treated used working Solution to a value in the ränge of 4 to 8;
f) aerating the reagent-treated used working Solution while maintaining the pH in the ränge of 4 to 8;
g) contacting the reagent-treated used working Solution with one or more
oxidants to remove organic contaminants, thereby regenerating the working Solution; and
h) supplying the regenerated working Solution for further purification of contaminated salt.
2. The method of claim 1, wherein said one or more reagents comprises sodium
hydroxide, calcium oxide, calcium carbonate, calcium bi-carbonate, sodium carbonate,
sodium bicarbonate, calcium hydroxide, or a combination thereof.

3. The method of claim 1, wherein said salt is Na2SC>4, NaCl or a combination thereof.
4. The method of claim 1, wherein said solvent is water.
5. The method of claim 1, wherein the used working Solution is filtered prior to contacting with said one or more reagents.
6. The method of claim 1, wherein said one or more oxidants comprises oxygen, air, hydrogen peroxide, ozone, chlorine, a hypochlorite, a peroxide, a permanganate, a persulfate, a ferrate, peracetic acid, a peroxysulfate, hydroxyl radical, sulphate radical, Superoxide ion, or a combination thereof.
7. The method of claim 1, wherein said one or more oxidants degrade organic contaminants contributing to color, total organic carbon (TOC), or both in the used working Solution.
8. The method of claim 1, wherein said one or more oxidants is generated by application of electrical potential in a multiphase electrochemical System.
9. The method of claim 8, wherein the multiphase electrochemical System is a two-phase or a three-phase electrode System.
10. The method of claim 1, wherein said one or more oxidants are generated in the presence of a homogenous or a heterogeneous catalyst.
11. The method of claim 10, wherein the catalyst comprises MnC>2.

12. The method of claim 1, wherein said contacting the working Solution with the contaminated salt comprises: mixing the contaminated salt with the working Solution in the ränge of 1-75 w/w %.
13. The method of claim 1, wherein said contacting the working Solution with the contaminated salt comprises: supplying the contaminated salt in counter-current flow of the working Solution.
14. The method of claim 1, wherein said contacting the working Solution with the contaminated salt is performed in a batch mode or continuous mode.
15. An apparatus (300) for purifying contaminated salt while recycling a working Solution used in the purification, the apparatus comprising:

a) a reservoir (301) configured to störe and supply the working Solution;
b) one or more extraction Chambers (303-1,303-2,...303-n) configured to mix the contaminated salt and the working Solution to form a salt slurry, wherein the contaminated salt comprises one or more contaminants and the working Solution comprises saturating concentrations of the salt dissolved in one or more solvents;
c) a Separator (309) configured to filter purified salt from the salt slurry to obtain a used working Solution comprising the one or more contaminants;
d) one or more first treatment Chambers (311-1, 311-2,...311-n) configured to contact the used working Solution with one or more reagents for removing hardness, heavy metals, or a combination thereof;
e) one or more second treatment Chamber (325-1, 325-1,..325-n) for pH adjustment and aeration of the used working Solution; and
f) one or more third treatment Chambers configured to contact the reagent-treated used working Solution with one or more oxidants in a multiphase electrochemical System

(500. 500a) and/or a homogenous or heterogenous chemical catalytic System (313) to remove organic contaminants, and regenerate the working Solution.
16. The apparatus of claim 15, wherein said one or more extraction Chambers (303-l,...303-n) is configured to mix the contaminated salt in a counter-current flow of the working Solution.
17. The apparatus of claim 15, comprising a plurality of extraction Chambers (303-l,...303-n), wherein the plurality of extraction Chambers are connected in a serial or parallel configuration.
18. The apparatus of claim 15, further comprising a filter (315) configured to remove suspended solids in the used working Solution.
19. The apparatus of claim 15, wherein the treatment Chambers (500a) comprise a two phase electrode System.
20. The apparatus of claim 15, wherein the treatment Chambers (500) comprise a three phase electrode System.
21. The apparatus of claim 15, wherein the apparatus forms a closed-loop System for purification of the contaminated salt.