An apparatus for preparing sodium chloride crystals having large specific surface

An apparatus is described for preparing crystals of sodium chloride of mean particle size in the range 0.01 μ to 1 μ at rates as large as 0.8 g/h. Vapour is swept from the surface of molten sodium chloride in a turbulent stream of nitrogen and carried into an electrostatic precipitator where the small particles are collected. Although electron micrographs indicate that the particle size distribution is broad, large average specific surfaces (up to 64 m 2 /g) have been attained.