Magnesium hydroxideIt is a chemical material, which has many applications in the industrial field, such as fire prevention, sewage treatment and many other aspects, and it also has its own technical characteristics in the preparation method. So, what are the preparation methods of magnesium hydroxide?

1. Seawater and calcium hydroxide solution

It is obtained by the reaction of lime milk, so that a magnesium hydroxide precipitate can be obtained.

2, salty liquid water-lime method preparation.

The pre-purified brine and lime treated by slag removal are prepared into lime milk, precipitated and reacted in the tank, and a certain amount of flocculant is added to the obtained slurry. After mixing, the slurry is separated into a settling tank, filtered, washed and dried. After crushing, the slurry can be madeMagnesium hydroxideIt's up.

3, salty liquid water-ammonia preparation method.

Is the use of purification treatment, remove sulfate, carbon dioxide and boron and other impurities, with its brine as the basic raw material, the use of ammonia as a precipitant, precipitation in the reaction kettle, and then the reaction, and before the reaction need to cast a certain amount of seed, after stirring. The ratio of brine to ammonia is generally 1:0.9, but the temperature needs to be controlled at about 40°C. After the reaction, the flocculant is added, and the precipitate can be washed and dried after filtration, and the magnesium hydroxide product is made. This method has high recovery rate and short washing cycle, which is an advanced production process.

4. Bitter soil-hydrochloric acid-ammonia method

Magnesium hydroxide and carbon dioxide can be prepared by burning magnesite ore and anthracite, or coke in a shaft kiln. Magnesium hydroxide can also be prepared by reacting with a certain concentration of hydrochloric acid after pulping of bitter soil powder.

Anyway,Magnesium hydroxideIn the preparation is not complicated, but also through certain technical means, the use of certain additives and reaction materials, but pay attention to a certain ratio, so that magnesium hydroxide can be prepared.