Light magnesium oxide reacts with water to generate magnesium hydroxide, powdered magnesium oxide reacts with sewage to generate magnesium hydroxide MgO+H2O=Mg(OH)2, magnesium hydroxide has the characteristics of buffering, large activity, strong adsorption capacity, not corrosive, safe, non-toxic and harmless, which can react out the harmful impurities such as silica in sewage, and has been widely used in water treatment system in recent years. Especially the heavy metal in the sewage is more serious to the environment because of its high toxicity, not easy to be metabolized in the environment, easy to be biologically enriched and expand along the biological chain step by step, etc.
Magnesium hydroxide has a large surface area, strong adsorption capacity, solubility is larger than the general metal, so the treatment of heavy metal ions with magnesium hydroxide, in addition to the adsorption effect, will also produce precipitates due to the replacement effect.
According to the research of Hebei Messi Biology Co., Ltd, magnesium hydroxide can not only neutralize the acid in wastewater, but also form precipitation for Cu, Fe, Cr(111), Pb, Zn plasma in water, and further remove it through the adsorption of magnesium hydroxide, which can achieve the purpose of complete removal, and the Ni and Cd plasma can also be partially removed.
The magnesium oxide for wastewater treatment is divided into light-burned magnesium oxide and light magnesium oxide, manufacturers who want to save cost will choose light-burned magnesium oxide, because its production process is simple and the price is relatively low. And light magnesium oxide has good quality, high purity and low heavy metal content, which will be more effective as adsorbent.