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