.... LINKING THE RELATIONSHIP 
   Home      SERVICES      OUR R&D PROJECTS

 
 
R&D PROJECT:
  
SCRUBBING AS A PROCESS TO REFINE GRAPHITE
(INITIAL DESIGN AND TRIAL OF SCRUBBING SYSTEM)


PROJECT OVERVIEW
 
Large graphite flakes are essential raw materials in applications for many industries. In the traditional processing of graphite flakes, a multi-stage grinding-flotation process is used to conserve large flakes in graphite concentrates.  A stirring mill is typically used for regrinding, wherein small impact forces and strong grinding stripping strength prevent large flakes from being destroyed during regrinding. 
 
However, high-quality graphite resources that contain large graphite flakes are increasingly scarce rendering traditional techniques potentially wasteful. Furthermore, fractional flake graphite ores do not contain any large flakes and have relatively finely disseminated grain sizes. 
 
A stirred mill is often used in regrinding processes. However, stirred mills require high energy consumption and engender serious wear. 
 
In traditional processing of graphite flakes, a grinding-flotation process is used to conserve large flakes of graphite concentrates.   The main problem with this is that the technology cannot be used to process flake graphite ore without the presence of large-sized flakes in the ore. 
 
PROJECT OBJECTIVE
 
The aim of this project is to build a process whereby regrinding can be replaced with scrubbing in graphite flotation process.  Scrubbing technology is typically used for the processing of high purity molybdenum concentrates or molybdenum disulfides by removing superfluous reagents adsorbed on particle surfaces and breaking up particle agglomeration.  Additionally, scrubbing produces an abrasive action.  Because the main functions of regrinding are breaking and "cleaning", we could potentially replace regrinding with scrubbing and substitute stirred mills with powerful scrubbing machines to remove or minimise flotation foams in graphite concentrates. 
 
Initial tests have shown that after several cleaner flotation stages, a graphite concentrate with an ideal fixed carbon content (FC) of 94.53% and 60.03% recovery could be obtained by scrubbing to the same rough grinding fineness compared with regrinding.   Furthermore reagent adsorption showed that scrubbing could remove a fraction of the adsorbed reagents on the graphite surface to improve the floatability of graphite concentrate. 
 
CORE ACTIVITY
 
The basis of this project is to complete the trials of various forms of scrubbing with a range of graphite flake sizes so as to produce an effective flowsheet utilizing this new technology.  This in turn will lead to a more cost effective with significantly less damage large flake sizes within the ore.