Since 1930, with the market's demand for copper metal plummeting, the development of new Flotation Equipment has stagnated. By the end of World War II in 1945, the mechanical flotation flotation machine had become the most widely used type of flotation machine, although the inflatable flotation machine was still in use.
At that time, a large concentrator had to use hundreds of flotation tanks of about 2 m3, and the construction, management and operation costs were high. For example, in 1942, the American Mollensey Concentrator was the largest concentrator at the time, with a processing capacity of 40.8 kt/d. The plant used 432 1.7 m3 Fagergren flotation machines. It was not until 1960 that the price of copper metal rose again.
Comparing to regular Flotation Machine, in the reverse flotation of dolomite the recovery and grade of MgO has no significance improvement. While, in the case of reverse flotation of silicon dioxide, the new flotation machine has significance advantage. In 5 minutes of flotation time, the yield of froth is 20.66% with new machine, which equals to yield using regular machine under 8 minutes. The flotation time has been shorten by new machine. In addition, the recovery of silicon dioxide improved by 6% and the grade of silicon dioxide in phosphate concentrate decreased by 1.3% comparing the regular flotation machine. The results demonstrate that new flotation machine is more suitable and efficient for phosphate flotation.