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