Graphite used for high tech products such as Lithium ion batteries or fuel cells demands higher purity than typically upgraded by flotation. The chemical purification technology should be considered for further purification of graphite concentrate to TGC 99.99%.
When the aeration rate was greater than 0.9 L/min, the graphite flotation recovery increased less significantly with an increase in the aeration rate. The high flotation recovery of 97.67% to 99.84% shown in Fig. 9a suggests that the use of the static flotation column can achieve efficient graphite flotation separation performance. The behavior ...
As the graphite flake size is one of the most important quality indicators, so in the sorting method using multi stage grinding, multiple sorting process in order to select the flake graphite as soon as possible. Flotation commonly used collector for the kerosene, diesel, etc., foaming agent for the second oil, fourth oil, adjusting agent for the lime, sodium carbonate, inhibitor for the water glass.
The flotation method is a relatively common method for purifying minerals. Since the graphite surface is not easily wetted by water, it has good floatability and is easily separated from impurity minerals. The flotation of graphite ore is generally carried out by positive flotation followed by reverse flotation of the flotation concentrate.
Most low grade graphite ores are crystalline and respond very well to flotation treatment for graphite recovery. Where a fairly high percentage of the graphite in the comminuted ore is in the +100 mesh it is possible and sometimes desirable to screen out and recover the coarse fractions to market them as such. Coarse flake graphite generally commands a much higher price. On the other hand, where a maximum percentage of graphite in the concentrate is desired, the coarse fraction is recovered as soon and as coarse as possible and returned to a later point in the flotation circuit, thus avoiding overgrinding the coarse fraction.
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The flowsheet is for a mill of 125 tons ore per day capacity. One objective of the flowsheet is to attain maximum recovery of the graphite in a concentrate assaying about 84 85 percent graphite carbon, and having approximately the following screen analysis: Minus 100 plus 200 mesh. 10 11% Minus 200 plus 325 mesh. 20 21% Minus 325 mesh. 60 70% Many ores of this nature will assay about 20 percent graphite carbon. The gangue is normally siliceous, but may contain a small amount of pyrite. The specific gravity of this type of ore generally will run about 2.62. The ore would be classed as a medium ore to grind.
Crucible grade flake graphite has a size range of 20 to 50 mesh and contains 83 to 90 per cent carbon.
The production of a coarse, tough flake product with the desired impurity removal is necessary. Flotation is successful, but special reagents may be necessary to depress gangue particles that may become coated with some graphite in grinding. Stage grinding in closed circuit with vibrating screens may remove much gangue as oversize. Generally, for maximum grade, tabling of the cleaned flotation graphite concentrate is necessary to remove middlings for re grind and re treatment. Silica Sand: Mo...
Alcohol or pine oil frother alone, or with a mineral oil collector such as kerosene, is generally used. Acid or alkali reagents may be necessary to depress gangue. Graphite is one of the easiest minerals to float, even in flakes up to 10 mesh and coarser. Flowsheet of an operating graphite flotation plant treating up to 400 tons of ore per day. Grind is minus 10 mesh and flake graphite is recovered at coarse size. Source:This article is a reproduction of an excerpt of In the Public Domain d...