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Despite the Woxna project producing graphite to grade and recovery specifications, the global flake graphite became increasingly challenging during 2015, with prices falling to four year lows of less than US700/tonne. Given these weakening conditions, in July 2015 the Board elected to halt production until graphite prices recover.
This pretreatment increases the flotation performance, the graphite concentrate grade increase from % C to % C with 10 minutes attrition, with a stable carbon recovery of 90 wt. %.
Graphite Beneficiation Process
In the raw ore, the grade is 4%5%, but after this flotation separation process, the grade should be 89% and the recovery rate is about 80%. To get high purity graphite and high carbon graphite products, the fine concentrates should go through wet process chemical purification to reach the grade of 98%.
Crystalloid graphite most use concentrate regrinding process, normally, the recovery ratio can up to around 80%. Cryptocrystalline graphite mineral processing flowsheet: although Cryptocrystalline graphite have high grade, it is different to separate.
The grade of amorphous graphite ranges from 2040% in Cg (graphite content), and the purity varies between 7085% carbon after refining. Large amorphous graphite deposits are found in China, Mexico, and United States.
#0183;#32;It is important to note that obtaining highgrade graphite by conventional flotation depends on the many factors such as (i) nature of graphite crystallinity, (ii) percentage of impurities present in graphite ore, (iii) grade and fixed carbon content of graphite ore, (iv) preprocessing of graphite ore by grinding, scrubbing, screening, etc. and (v) number of stages involved in flotation process.
Graphite Test Results. Based on the results of the assay and flake size characterization, you will be able to see how the recovery process will affect your graphite project economics. If the results show promise, we will continue with testing to discover the optimal way to recover the graphite.
Starting with the initial characterization of the graphite ore through development of a beneficiation process to obtain a high quality flake graphite concentrate, shaping and purification into battery grade spherical graphite, characterization of electrochemical performance and testing of Li ion cells.
#0183;#32;Importantly, the results in Table 7 via the process in Fig. 6 indicate a consistent recovery range of more than % and a grade of higher than % total graphite carbon regardless of the feed grade.
#0183;#32;A graphite processing plant with a capacity to process 300,000t/y of ore with a TGC grade of 16% is planned for the mine. The processing plant is designed with a graphitic carbon recovery rate of approximately 85%.
...recovery scenarios Nameplate Capacity 85% Availability Process plant CAPEX Total infrastructure CAPEX Recovery 70% 80% 90% 94% Baseby Lincoln, outlined high grade flake graphite grading up to 12m at % total graphitic carbon (TGC) in trenches over a strike length in excess of 550m.
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