How to improve the purity of magnesium carbonate?

Improving the purity of magnesium carbonate is an important goal in chemical preparation,as high-purity magnesium carbonate has a wide range of applications in fields such as medicine,ceramics,rubber and plastics.Here are some methods to improve the purity of magnesium carbonate

Improving the purity of magnesium carbonate is an important goal in chemical preparation,as high-purity magnesium carbonate has a wide range of applications in fields such as medicine,ceramics,rubber and plastics.Here are some methods to improve the purity of magnesium carbonate:

Choosing high-purity raw materials:Using high-purity raw materials is the basis for obtaining high-purity magnesium carbonate.For example,using industrial grade magnesium hydroxide coarse powder as raw material,it can be made into a nanoscale suspension slurry through liquid-phase grinding,and then reacted with ammonium carbonate solution to significantly improve the purity of magnesium carbonate.

Optimizing preparation process:Different preparation methods can affect the purity of magnesium carbonate.Precipitation method is a commonly used preparation method,which involves adding carbonate ions to a solution containing magnesium ions to react with them to form magnesium carbonate precipitate.This method is easy to operate and cost-effective,but it requires careful control of reaction conditions to reduce the introduction of impurities.Hydrothermal and electrolytic methods are also effective methods for preparing magnesium carbonate,among which the hydrothermal method produces magnesium carbonate with higher purity,but requires larger equipment investment;The purity of magnesium carbonate prepared by electrolysis is also high,but it consumes a lot of energy.

Strict control of reaction conditions:During the preparation process,strict control of reaction temperature,pH value,reaction time,and other conditions can reduce the occurrence of side reactions and improve the purity of magnesium carbonate.For example,in the precipitation method,pure magnesium carbonate precipitation can be formed by adjusting the pH of the solution to around 8.

Multiple washing and filtration:During the preparation process,the precipitate is washed with hot water multiple times and filtered to remove most soluble impurities and some insoluble impurities,thereby further improving the purity of magnesium carbonate.

Post processing purification:For the already prepared magnesium carbonate powder,further purification can be achieved through methods such as calcination and recrystallization.For example,calcining magnesium carbonate powder at different temperatures can remove organic matter and other impurities from it.

Adding stabilizers or accelerators:In some cases,adding an appropriate amount of stabilizers or accelerators can improve the thermal stability of magnesium carbonate or promote its crystallization process,indirectly increasing its purity.For example,adding carbon dioxide as an equilibrium promoter for the reverse hydrolysis reaction of ammonium bicarbonate during the preparation process.

Avoid pollution:Throughout the entire preparation process,contact with oxygen,moisture,or other pollutants in the air should be avoided as much as possible to prevent magnesium carbonate from being oxidized or introducing other impurities.

It should be noted that improving the purity of magnesium carbonate is a complex process that requires comprehensive consideration of multiple factors.In practical operation,appropriate methods and measures should be selected according to the specific situation.In addition,with the advancement of technology and the deepening of research,new preparation methods and purification technologies continue to emerge,providing more possibilities for improving the purity of magnesium carbonate.