These Tilting Concentrators play a most important part in recovering the mineral in the fine size range. The overflow slime product from the hydraulic classifier is thickened in a Spiral Rake Thickener and treated on Buckman Tilting Concentrators to recover the extremely fine tungsten mineral. The table middling is pumped back to the rod mill for regrinding after being dewatered in a spitz-type dewaterer.īuckman Tilting Concentrator to recovery Wolframite The flotation tailing is hydraulically or mechanically classified and tabled to produce a finished high grade tungsten concentrate, a middling product, and a final tailing.
A rougher concentrate is shown, but this can be cleaned, and a high grade concentrate produced in the same flotation machine, provided that a “Sub-A” Flotation Machine is used. The object of the flotation section is to remove the remaining fine gold and sulphides before table concentration for the recovery of tungsten. The classifier overflow passes by gravity to a Super-Agitator and Conditioner prior to “Sub-A” Flotation. Scheelite, a calcium tungstate, is non-magnetic. Magnetic separation may also be employed to concentrate Wolframite or other magnetic tungsten minerals, such as Ferberite and Huebnerite. In some cases the treatment of the jig concentrate may not require additional grinding but can be subjected to roasting followed by magnetic separation to remove pyrite. For simplicity, retreatment of the jig concentrate is not shown, but this includes regrinding with the possibility of amalgamation, flotation, and cyanidation to produce gold in either concentrate or bullion form and a high grade Scheelite concentrate. This jig is selective in its action and is particularly suited for the recovery of fine mineral as well as coarser particles in a high grade product.
#Eternal lands wolframite ore free#
The free sulphides, gold and tungsten, are removed in the grinding circuit by means of the Mineral Jig. The rod mill is of the special grate-discharge type which is extensively used for tungsten and many non-metallic ores where overgrinding is a serious factor. The crushed ore from the fine ore bin is ground in a Rod Mill to free the minerals with as little sliming as possible. A possibility not used in this flowsheet but sometimes advisable, is to remove the approximate minus 10 mesh fraction from the crushed ore and treat this product on a Mineral Jig prior to grinding. The vibrating screen undersize passes to a fine ore bin for storage prior to grinding.
This arrangement requires one less conveyor belt than old- style crushing flowsheets. Note the ingenious features of this crushing circuit whereby the jaw crusher and cone crusher products are conveyed to the vibrating screen on common belt conveyor. The screen oversize is crushed in a secondary cone crusher and the crushed product returned to the vibrating screen.Ĭrushing Rolls (with large diameter shells) could be employed in place of the cone crusher and in some cases, would probably be preferable. Primary crushing is accomplished by the Forced Feed jaw Crusher which discharges to a conveyor and then to a Vibrating Screen. The crushing section is designed to remove the undersize between each crushing step and thus prevent excessive production of fines. THE Tungsten Rich Wolframite Ore FLOWSHEET Tungsten Rock Crushing Circuit There are numerous possibilities that could be applicable to this problem, but the described flowsheet offered the greatest degree of flexibility. Consequently, it is evident that other concentration processes must be incorporated in the flowsheet to produce separate marketable concentrates of tungsten and gold. Straight gravity concentration of this ore, using the flowsheet shown, would result in a mixed gold-tungsten concentrate containing much sulphide which is not desirable for marketing. This fact was kept in mind for the study shown here, but the problem was complicated due to the occurrence of iron sulphides and free gold with Scheelite.
This is necessary because of the friable nature of all tungsten minerals. The first consideration of any tungsten ore is to recover the mineral as coarse as possible and avoid sliming and overgrinding by stage crushing and grinding. The flowsheet study previously shown for tungsten was devised for a simple tungsten ore free of other heavy minerals. The flowsheet study shown here was recently developed for treatment of a very complex tungsten-gold ore. The present great demand for tungsten due to world conditions has resulted in an increase of tungsten ore dressing problems for our metallurgists.
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