Sodium arsenate is the main component of arsenic containing solid waste pollutants, posing a serious threat to environmental health. Crystallization is one of the effective methods for separating and purifying sodium arsenate from the leaching solution of arsenic alkali residue. However, due to poor observability and lack of separation and purification data, the crystallization process is limited. This article designs a laser detection system with a magnetic field generator to study the solubility, metastable zone width, interfacial tension, interfacial entropy factor, crystal nucleation and growth rate of sodium arsenate in a constant composition environment. The results indicate that with the presence of a magnetic field, solubility, metastable zone width, interfacial tension, and interfacial entropy factor all decrease. The magnetic field shortened the crystallization induction time and altered the nucleation and growth rate of sodium arsenate. In addition, X-ray diffraction and infrared analysis showed that the magnetic field had no effect on the crystal structure of sodium arsenate, indicating that magnetic field enhanced crystallization process of sodium arsenate is a feasible engineering application method.

    The basic thermodynamic and kinetic datasets for the cooling crystallization process of sodium arsenate were obtained through experimental methods and formula inference calculations. The data format is decimal (. xls), with a total of 16 experiments and 3 sets of data.