dry blowing การใช้

The observer found the dry blowing process to be " both tedious and unhealthy ."
In 1914 only 1.5 tons of tin was obtained through sluicing operations on the Tate, while just 5.5 ton were recovered by dry blowing.
A contemporary description of the dry blowing process used at Mount Browne in 1881 states that miners there went to work with " a small broom made of twigs and a tin dish ".
The former La Soci閠?Fran鏰ise des M閠aux Rares treatment plant has the potential to contribute to our understanding of the different processing methods used in the treatment of wolfram, prior to WWI . The relatively high value of the mineral led to the experimentation with different processing methods such as the dry blowing process used at La Soceite de Francaise des Metaux Rares treatment plant.