Process and apparatus for accurately controlling the rate of introduction and the content of {TAIL ~ alumina} in an igneous electrolysis tank in {HEAD ~ the production} of aluminium 
Process and apparatus for accurately controlling the rate of introduction and the content of { TAIL ~ alumina } in an igneous electrolysis tank in { HEAD ~ the production } of aluminium
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH