Hebei Messi Biology Co., Ltd. stated that in recent years, the application field of basic magnesium carbonate has been continuously expanded, and many new uses have been developed, such as: used as an additive and improver for rubber, medicine, insulating materials, dental preparations, high-grade glass, food and various chemical products. At present, the demand for basic magnesium carbonate in various countries in the world is increasing, and the market for basic magnesium carbonate in my country is also in the development stage, and the application prospects are very broad.
Basic magnesium carbonate is a white monoclinic crystal or amorphous powder, non-toxic, odorless, stable in the air, and slightly soluble in water. The basic magnesium carbonate used in industry is usually expressed by the chemical formula xMgC03.Mg(0H)2.yH20. The values represented by x and y in this chemical formula vary due to changes in production conditions, so they are not constants. Usually X is 3 to 5 and y is 3 to 8. Basic magnesium carbonate is usually obtained in the form of amorphous aggregated particles of flaky microcrystals, with a bulk density as low as 0.2~0.3g/ml and a relatively high specific surface area of 10~40m2/g. Due to these characteristics, basic magnesium carbonate has become an important inorganic chemical product and can be used to prepare high-purity magnesia and magnesium salt products.
Taking magnesium chloride and sodium carbonate as raw materials, basic magnesium carbonate whiskers are obtained by controlling the reaction temperature, stirring time, aging time and other conditions. Basic magnesium carbonate is obtained by mixing magnesium sulfate solution and sodium carbonate solution at 20-60°C. Taking sodium bicarbonate and magnesium chloride as raw materials, magnesium carbonate whiskers are first obtained by controlling the reaction conditions, and then the filtered magnesium carbonate solution is further reacted to obtain basic magnesium carbonate.
In the selection of raw materials for the preparation of basic magnesium carbonate, the selected carbonate raw materials are all sodium carbonate or sodium bicarbonate solution, and these raw materials are relatively expensive. The object of the present invention is to provide a method for preparing basic magnesium carbonate. The raw material carbonate adopted is agricultural grade ammonium bicarbonate, which can greatly reduce the production cost. At the same time, in order to maximize the utilization of raw materials, the utilization rate of the raw material magnesium chloride is high, the magnesium yield reaches more than 95%, and the obtained basic magnesium carbonate is of high quality, and the magnesium oxide content is 41% to 44%.