Gravity separation is based on ore mineral density differential selection methods, beneficiation in contemporary plays an important role. It's a long history, from ancient humans began to understand when the use of metal materials, the use of animal skins in natural metal or panning rivers in natural minerals. Later with a wooden chute for sorting. About 400 years ago the original type of jig , but then the production or workshop-style. 18 to 60 years in the Western industrial revolution took place, the metal of the demand for raw materials increasing l. At the same time the emergence of the steam engine has provided the impetus for the mechanization of production, so the re-election as an industrial sector and the emergence of 1830-1840 was asked in German Haz (Harz) mining the early days of the Pistons continue to be improved jig has been widely used.(Baum jig)。 1892 invented a large-scale wind-driven coal jig with Baum (Baum jig). 1890 United States built the first coal with combat-style shaker ,1896-1898 A · Will Foley (Wilflev) invented the modern type of shaker.Although the shaking was also regarded as a chute, called out of disk, but since then its unique way of sorting and self-contained.With the emergence of Shaker, pre-classification sorting, removing mud and other preparatory work is also widely used. Thus, the main process re-election of the type of classification ,Sawtooth wave jig, Shaking table, and Chute already selected in the 19th century, the basic form, and became almost the only way of dressing.
In the 20th century who started the rise of froth flotation,.While in weak magnetic separator made ??after 1890 to obtain promotion.They are dealing with micro-fine disseminated sulphide and magnetite achieved excellent results.． The relative position of re-election has been reduced.But in ore handling capacity still exceeds flotation and magnetic separation. Early 20th century after a period of stagnation, the re-election to continue to deal with coarse-grained method to improve separation efficiency。
Centrifugal concentrator
jig machine
shaking table
spiral concentrator
vibrating sluice box
