Messi Biology stated that basic magnesium carbonate is an important inorganic chemical product and has wide applications in modern society. With the acceleration of the modernization process, the demand for basic magnesium carbonate in countries around the world has increased. Existing products can no longer meet the growing demand, and it is urgent to solve the contradiction between supply and demand. This article introduces the physical and chemical properties of basic magnesium carbonate, summarizes the main synthesis methods and applications of basic magnesium carbonate in detail, and discusses some existing problems. Finally, the future development direction of basic magnesium carbonate is predicted. and prospects, hoping to provide reference for the research work on basic magnesium carbonate.
1. Preparation method
Basic magnesium carbonate is an important inorganic compound widely used in rubber, coatings, plastics and other industrial fields. Its preparation methods are mainly divided into three categories: chemical methods, physical methods and biological methods.
(1) Chemical method
Commonly used chemical methods to prepare basic magnesium carbonate include solution method and solid reaction method.
1.Solution method
The solution method is prepared by mixing an aqueous solution of calcium and magnesium. Specifically: first add the aqueous solution containing calcium and magnesium to the sodium carbonate solution, add an appropriate amount of ammonia or sodium hydroxide to make the system alkaline, then evaporate the mixed solution to a certain solution concentration using a high-temperature and low-pressure evaporator, and finally cool and crystallize. Basic magnesium carbonate is obtained.
2. Solid reaction method
The solid reaction method is prepared by solid mixing. Specifically: mix magnesium hydroxide and calcium carbonate powder, heat to 800-1000°C, react to generate basic magnesium carbonate and water vapor, and then obtain the product through cooling and crystallization.
(2)Physical method
The physical method is to mix multiple raw materials through physical means. Currently, the commonly used physical methods to prepare basic magnesium carbonate include co-precipitation method and magnesium hydroxide method.
1. Co-precipitation method
The co-precipitation method uses the precipitation generated in the aqueous phase by chemical reactions to prepare basic magnesium carbonate. First, the calcium salt and magnesium salt are put into the aqueous solution at the same time, and carbonate ions or sodium carbonate are added to make the system alkaline. Then the turbidity generated by the rapidly precipitated magnesium carbonate is used as a precipitate. After washing and filtration, the required basic carbonic acid is obtained. magnesium.
2. Magnesium hydroxide method
The magnesium hydroxide method is to mix magnesium hydroxide and calcium carbonate, and then use hot water or other methods to turn it into a certain form of basic magnesium carbonate.
(3) Biological method
The method of biological preparation of basic magnesium carbonate is a recently emerging modern biotechnology. Microorganisms are used to act on inorganic salt solutions and their metabolic reactions are used to synthesize magnesium carbonate. This method has many advantages such as sustainability and environmental protection. Research on its preparation and use technology can promote the development of biomanufacturing.
2. Application
Basic magnesium carbonate is an important inorganic compound widely used in rubber, coatings, plastics and other industrial fields.
(1) Rubber industry
Adding a certain proportion of basic magnesium carbonate to rubber can improve the hardness, wear resistance and oxidation resistance of the rubber, and reduce the deformation and aging of the rubber during production and use. Therefore, in rubber production, basic magnesium carbonate is widely used in various types of tires, sealing rings, rubber tubes, rubber rollers and other products.
(2) Paint industry
Adding a certain proportion of basic magnesium carbonate to the paint can not only improve the hardness and wear resistance of the paint, but also increase the adhesion and aging resistance of the paint, and improve the paint color. Therefore, in the modern coatings industry, basic magnesium carbonate is often used in various resins, spray paints, epoxy floor paints and other coatings.
(3) Plastic industry
Basic magnesium carbonate is an effective flame retardant. Adding it to plastics can improve the flame resistance of plastics. At the same time, adding basic magnesium carbonate to plastics can also adjust the mechanical properties of plastics, increase gloss and improve surface treatment. Therefore, basic magnesium carbonate is widely used in the plastics industry and has become an indispensable substance in plastic processing.
Messi Biology stated that the application of basic magnesium carbonate in the industrial field is extensive, diverse and important. In the future, with the development of industry and technological progress, the application prospects of basic magnesium carbonate will be even better. At the same time, we also need to continuously optimize its preparation methods and technologies to improve its production efficiency and environmental protection.