Hebei Messi Biology Co., Ltd. stated that among the many cosmetic categories, cosmetics produced with spherical magnesium carbonate as an additive are smooth, delicate, good in feel, white in color, and make the skin shiny and whitening. They have excellent whitening effects and are especially popular among people. In addition, the national standard has strict regulations on the index requirements for magnesium carbonate for cosmetics, including the constant weight content of magnesium oxide on ignition, calcium oxide content, chloride content, sulfate content, acid insoluble matter, iron, manganese, heavy metals, arsenic, etc. In addition to these chemical indicators, the bulk density as a physical performance indicator is also crucial for magnesium carbonate products for cosmetics. The bulk density of magnesium carbonate for cosmetics will directly affect the fluidity, mixing uniformity and quality uniformity of cosmetics.
Add an appropriate amount of additives to the magnesium bicarbonate solution, and obtain magnesium carbonate whiskers of different specifications by controlling the conditions for the crystallization of magnesium carbonate. Although this process has high product purity, the reaction time is too long, which is not conducive to industrial production. Using soluble magnesium salt and soluble carbonate as raw materials, under the action of additives, by controlling the reaction conditions, high-purity spherical magnesium carbonate powder is obtained. The product obtained by this process has high purity and short reaction time, but the concentration of heavy metal ions contained in the product seriously exceeds the national standard and cannot meet the demand for cosmetic-grade spherical magnesium carbonate. At the same time, in actual application, cosmetic magnesium carbonate manufacturers require that the bulk density of cosmetic-grade magnesium carbonate should be controlled within the range of 0.16 to 0.5 g/mL. Therefore, in addition to meeting the performance indicators required by the national standard for cosmetic magnesium carbonate, it is very necessary to develop a production method that can produce cosmetic spherical magnesium carbonate with a bulk density in the range of 0.16 to 0.5 g/mL.