Question

Why iron and Manganese cannot be removed by Demineralization process? *​

Answer 1

Answer:

Demineralization generally results in almost complete removal of minerals, and is thus typically reserved for applications requiring higher level of water purity, such as feed or makeup water for high pressure boilers, rinse water for food and beverage industries, or process streams used in electronics manufacture, for example. For fresh water applications, demineralization can be a good alternative to distillation, as it is capable of producing water similar in quality to distilled water, but through a more cost-effective ion exchange process.

Below we have outlined the most common contaminants treated by demineralizers:

Cations

The cation resins within a demineralization system will exchange cations, or contaminants having a positive charge. Common cationic contaminants include:

Calcium (Ca2+)

Iron (Fe3+)

Magnesium (Mg2+)

Manganese (Mn2+)

Potassium (K+)

Sodium (Na+)

Anions

The anion resins within a demineralization system will exchange anions, or contaminants having a negative charge. Common anionic contaminants include:

Alkalinity (CO32-, HCO3–)

Chloride (Cl–)

Nitrate (NO3–)

Sulfates (SO42-)

Silica (SiO2)