System for producing magnesium chloride and system for producing magnesium

A system for producing magnesium chloride comprising:

• a removal unit;
• and
• a concentration unit that is connected to the removal unit,
• wherein the removal unit generates feedstock water by removing sulfate ions and sodium ions from treatment target water having seawater as a feedstock,
• wherein the concentration unit generates a slurry in which magnesium chloride is crystallized by concentrating the feedstock water, and
• wherein the removal unit has
• a first removal unit which reduces a sulfate ion concentration compared to the sulfate ion concentration in the treatment target water, and
• a second removal unit which reduces a sodium ion concentration compared to the sodium ion concentration in the treatment target water,
• wherein the second removal unit is connected to a rear part of the first removal unit, and
• wherein the second removal unit is a nano-filtering membrane that separates treated water in which the sulfate ion concentration has been reduced compared to the sulfate ion concentration in the treatment target water by the first removal unit into the feedstock water and waste-water.

A system for producing magnesium chloride comprising:

• a removal unit;
• and
• a concentration unit that is connected to the removal unit,
• wherein the removal unit generates feedstock water by removing sulfate ions and sodium ions from treatment target water having seawater as a feedstock,
• wherein the concentration unit generates a slurry in which magnesium chloride is crystallized by concentrating the feedstock water, and
• wherein the removal unit has
• a first removal unit which reduces a sulfate ion concentration compared to the sulfate ion concentration in the treatment target water, and
• a second removal unit which reduces a sodium ion concentration compared to the sodium ion concentration in the treatment target water,
• wherein the first removal unit is connected to a rear part of the second removal unit, and
• wherein the second removal unit is an electrodialysis tank that reduces the sodium ion concentration and a chloride ion concentration compared to the sodium ion concentration and the chloride ion concentration in the treatment target water.