mobile gold processing plant serves to scalp

The circuit illustrated in Fig. 3 is similar to that of Fig. 2, but includes a secondary mill 10' in circuit with primary mill 10. In this case the fines passing through the lower deck of vibrating screen 27 are separated as by means of a classifier 26,<a href=”http://www.sellercrusher.com/project/mobile-gold-processing-plant.html">mobile gold processing plant</a> the coarser portion being returned to the feed end of the primary mill 10, as shown by dotted line 30, while the finer portion of the slurry is conveyed to the feed end of the secondary mill 10'. The smaller grinding media discharged from primary mill 10 are scalped off by the fine meshed lower deck of screen 27 and serve as grinding media for the secondary mill 10'. Since the material being ground in secondary mill 10' is finer than that in the primary mill, it can utilize the smaller grinding media efficiently.

The discharge from secondary mill 10' passes to a separator 33, which in this case is a vibrating screen similar to that shown at 27. Here the larger,<a href=”http://www.sellercrusher.com/project/talc-powder-production-line.html">talc powder production line</a> useful grinding media are scalped off and returned to the feed of the secondary mill, as shown by path 34. The lower deck of screen 33 serves to scalp off the small and broken grinding media and pieces of liner, which are discarded.

The continuous removal of this useless media and spalls greatly increases the efficiency of the operation of the secondary grinding mill. The slurry passing through the lower deck of screen 33 may be further separated, as by means of a classifier 26', the fines being removed from the circuit as finished material at 35, while the coarser fraction is returned to the secondary mill feed, as shown at 36. It will be noted that classifier tailings circuits 30 and 36 are shown in dotted lines, to indicate that this part of the circuit, together with classifiers 26 and 26', may be omitted if no circulating load is desired. The term “grinding media” as used herein is generic to steel balls, “Concavex” grinding media, pebbles and other types of bodies used in grinding; while the term “raw material” refers to the material which is to be ground.