Application overview of basic magnesium carbonate
Basic magnesium carbonate is an inorganic compound that can be used as an important inorganic chemical product. In addition to being used as a raw material for the preparation of high-purity magnesia, magnesium salts and other series of products, basic magnesium carbonate can also be used as rubber, Additives and improvers for chemical products such as drugs and insulation materials have broad application prospects.
Application and preparation of basic magnesium carbonate
Method 1. Basic magnesium carbonate is prepared as follows:
(1) Dissolve MgCl2·6H2O in the aqueous solution, add an appropriate amount of absolute ethanol to form 48g/L MgCl2 Aqueous solution, control the pH of the reaction solution to 9 to 11;
(2) Pour high-purity carbon dioxide gas into the MgCl2 aqueous solution, and control the injection rate to about 0.5L/min;
(3) Heat the above solution under high-speed stirring, the heating temperature is from room temperature to 80 degrees, and the reflux time is from 1 to 4 hours;
(4) The obtained sample is filtered, washed with deionized water to make it neutral, and finally washed with absolute ethanol 1 to 2 times;
(5) Dry the white precipitate obtained in (4) at 50-80 degrees for 10 hours.
Method 2: The process of producing high-purity basic magnesium carbonate in a fully automatic assembly line, which includes the following steps:
S11: After the magnesium salt and carbonate, the raw materials required for synthesis, are dissolved respectively, pump them into the reaction kettle at a weight ratio of magnesium salt: carbonate = 2:1;
S12: After the reaction is completed according to the reaction conditions of 80 to 90°C and normal pressure, open the reaction kettle valve and inject the slurry obtained by the reaction into the automatic washing machine. At the same time, open the high-purity water to enter the washing divider and discharge the material. Perform lithium carbonate at the same time as washing;
S13: The washing is completed and basic magnesium carbonate is obtained.
Applications of basic magnesium carbonate
Basic magnesium carbonate is a commonly used and important inorganic magnesium chemical raw material. It can be used as a precursor for calcining magnesium oxide to obtain magnesium oxide with special morphology. Basic magnesium carbonate is non-flammable, light and loose, so it can be used as a heat-insulating, high-temperature-resistant fireproof insulation material; basic magnesium carbonate is composed of flaky microcrystals, has a high specific surface area, high oil and water absorption properties, low bulk density and low porosity, so it can be used as low-density paper filler; basic magnesium carbonate can be made into aluminum magnesium carbonate double salt, which can increase the pH value of the stomach, promote tissue repair and regeneration, and is useful in treating ulcers It plays an important role and has wide applications. In addition, basic magnesium carbonate can also be used in daily necessities such as medicines, paints, toothpastes, and cosmetic additives. Basic magnesium carbonate has a wide range of applications, and its prospects cannot be underestimated.
A process for producing rare earth magnesium borate alloys from basic magnesium carbonate, using hydrous magnesium chloride and hydrous rare earth chloride as electrolytic raw materials, using molybdenum rods as cathodes or liquid metal rare earths or liquid magnesium rare earth alloys as sinking cathodes. Using a graphite crucible as the anode, direct current electrolysis is carried out through molten salt electrolysis, and a rare earth magnesium alloy is obtained at the cathode. A mixture of potassium chloride and sodium chloride with a mass ratio of 1:1~3 is used as the electrolyte. The hydrous magnesium chloride is produced by alkali Formula magnesium carbonate is prepared, and the preparation method is: (1) acid leaching of basic magnesium carbonate to obtain magnesium chloride solution; (2) evaporation and crystallization of magnesium chloride to obtain magnesium chloride hexahydrate crystals. The present invention uses basic magnesium carbonate as raw material and obtains a rare earth magnesium alloy with a rare earth content of 5% to 90% or more by DC electrolysis on the basis of obtaining a high-purity magnesium chloride hexahydrate intermediate product through an acid leaching pretreatment method. It has the advantages of smooth process, low cost, stable product quality and good quality, and has great promotion and application value.
A method for preparing monolithic porous carbon through phenolic polymerization catalyzed by basic magnesium carbonate, including the following steps: (1) preparing a saturated basic magnesium carbonate solution; (2) sequentially adding m-phenylene to the saturated basic magnesium carbonate solution Diphenols and formaldehyde are stirred and sealed, and reacted at 70-100°C for 4 hours to obtain a wet gel; (3) After drying the wet gel obtained in step (2), place it in a tubular carbonization furnace and inert gas Under the protection of the manufacturer, the temperature is raised to 650-1050°C, reacted for 2 hours, and then naturally cooled to room temperature to obtain monolithic porous carbon. The present invention uses resorcinol and formaldehyde as carbon sources, utilizes the catalytic effect and easy decomposition characteristics of basic magnesium carbonate, and quickly gels andMonolithic porous carbon is produced through carbonization, with a mechanical strength of 9.4MPa. This method has fast gelation speed, and the prepared product has a large specific surface area and a high CO2 equilibrium adsorption capacity.
