At the end of the 19th century, due to the increasing d […]
At the end of the 19th century, due to the increasing demand for metals, the resources of coarse-grained lead, zinc, and copper sulphide minerals that could be treated by re-election decreased gradually. In order to sort fine-grained ore, flotation was explicitly proposed as a beneficiation method. In 1903 Elmer proposed the hybrid oil flotation method, which was considered to be the starting point of modern flotation. Subsequently, the flotation process achieved rapid development. The development of flotation equipment was also in full swing, in 1909 Goover T.
The first multi-tank impeller stirrer for froth flotation, the inflatable flotation machine invented by John Callow in 1913, and the inflatable flotation column invented by Robert Towne and Frederick Flinn were manufactured. In 1914 Callow G patented a flotation device that injects air from the porous bottom of the trough. In 1915 Durrel made a prototype of a jet flotation machine. In the 1920s, foreign manufacturers developed various types of mechanical agitation flotation machines and inflatable mechanical agitation flotation machines in order to meet the needs of the flourishing copper industry in the power industry.
Since 1930, with the market's demand for copper metal plummeting, the development of new flotation machines 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. The shadows of economic recession and war gradually dispersed. The flotation equipment began to grow in size, and a few years later, the first large-scale mechanical flotation flotation machine The successful use of Bougainville Island announced the beginning of the large-scale flotation machine. Since the 1970s, in addition to mechanically agitated flotation machines, equipment such as inflatable flotation machines and flotation columns has also been continuously innovated in structure and materials, and has been gradually recognized by the market for large-scale industrial applications.