METHOD OF DETERMINING WETTABILITY OF FINELY-DISPERSE POWDERS Russian patent published in 2014 - IPC G01N13/00 

FIELD: chemistry.

SUBSTANCE: suspension of evenly distributed in air powder particles with a diameter not larger than 5 mcm with an initial concentration of a particle suspension, selected on condition T₀≤0.2, is created in a cuvette with transparent flat-parallel walls, and a spectral coefficient of the suspension transmittance is measured. After that, a flow of monodisperse drops with a diameter 0.8÷2.5 mm is supplied from an evenly distributed on the transverse section of the cuvette drop counters within the specified time interval t_k, determined from condition T_k>2T₀, with re-measurement of the spectral coefficient of the suspension transmittance. A parameter of the powder wettability is calculated by formula $$\beta =\frac{4V\ln \left[\left(\ln \frac{1}{T_0}\right){\left(\ln \frac{1}{T_k}\right)}^{-1}\right]}{\eta \pi D^{2}hnf{t}_k},$$ where V is the cuvette volume; T₀, T_k is the spectral coefficient of transmittance before and after precipitation of drops; η is the capture coefficient; D is the drop diameter; h is the cuvette height; n is a number of drop counters; f is frequency of drop falling; t_k is a time interval of supplying drops into the cuvette.

EFFECT: increased accuracy of determining characteristics of the powder material wettability and provision of measurement carrying out directly in a dust-air mixture.

3 tbl, 7 dwg