Research on magnesium hydroxide treatment of acidic wastewater

Hebei Messi Biology Co., Ltd. stated that my country’s coastal cities have unique and superior resources for treating urban industrial wastewater. This is the very rich salt field brine resource. The concentration of Mg2+ in the brine is as high as 110g/L~130g/L. Cheap lime is used As a precipitant, these Mg2 can be precipitated in the form of magnesium hydroxide slurry. Magnesium hydroxide is a new weakly alkaline and efficient pollution control raw material that is rising in the world in recent years. It can be called a “green and safe neutralizer”. Some strongly alkaline materials originally used in the treatment of acidic industrial wastewater and acidic waste gas, such as lime, caustic soda, soda ash, etc., are gradually being restricted in their use due to the increasing environmental protection calls and the improvement of environmental legislation in various countries around the world.

wastewater treatment magnesium hydroxide

The world is so optimistic about magnesium hydroxide because magnesium hydroxide has the following excellent qualities of acidic industrial wastewater:

(1) Magnesium hydroxide has buffering properties. No matter which acid it neutralizes, its highest pH does not exceed 9, which is the limit value specified by the US Environmental Protection Agency’s “Clean Water Regulations”. Therefore, even if the amount of magnesium hydroxide is too much, the pH value still meets the specified value and is easy to control. However, if other alkalis are used in excess, the pH value may be very high. For example, the pH value can reach 12.5 with lime, and the pH value can reach 14 with caustic soda. In contrast, magnesium hydroxide is safe, reliable and easy to operate;

(2) Using magnesium hydroxide as the neutralizing agent does not contain scaling substances, making it easy to operate and manage;

(3) Magnesium hydroxide has high activity and strong adsorption capacity. It can neutralize acidic liquids and adsorb various heavy metal ions, organic matter and various suspended solids in it, thereby effectively treating sewage;

(4) Slurry magnesium hydroxide (containing Mg(OH)2: 30%~45%) has non-settling, non-agglomerating and good fluidity, and is easy to pump and store, and is easy to use and adjust. convenient;

(5) It is not corrosive and does not require special anti-corrosion equipment;

(6) Safe, non-toxic and harmless.

Because of this, the United States, Japan, and some European countries are competing to expand the research, development and production capabilities of magnesium hydroxide, and at the same time explore research and development activities to improve grades and increase varieties.

Hebei Messi Biology Co., Ltd. stated that my country’s magnesium hydroxide production has just started in recent years. It is mainly obtained by calcining magnesite and is on a small scale. The use of brine-lime method to produce magnesium hydroxide is still in the research and development stage, and the research and development of using brine, that is, using magnesium hydroxide to treat urban industrial wastewater, has just started.

Scroll to Top