The preparation of calcium carbonate with different morphologies under the effect of alkanolamide 6502

The shape, size and polymorph of the crystals will affect their separation, drying and other properties. Surfactants may affect the crystallization process and crystalline products' properties by changing the surface tension in the solution. In this paper, the effects of alkanolamide 6502 as additive on the morphology of calcium carbonate was studied under the conditions of different additive volumes, temperatures and stirring rates. The results showed that the presence of alkanolamide 6502 has a certain effect on the morphology and crystal form of calcium carbonate. The addition of alkanolamide 6502 during the crystallization process was conductive to form vaterite, and the particle size of calcium carbonate was more uniform. Meanwhile, alkanolamide 6502 can change the surface properties of the product from hydrophilic to hydrophobic, preventing the agglomeration. Moreover, vaterite is more likely to form in the presence of alkanolamide 6502, and it is explained from the perspective that adsorption of hydroxyl on the crystal surface changes the physical surface properties of the crystal and inhibits the transformation of polymorphs.