| 摘要 |
<p>The process comprises continuous lixiviation with alumina mfr. recycle liq., and weak alkali soln., and maintaining the caustic soda in the resulting aluminate soln. (suspension) at 50-150 kg/m3. The alkali modulus of the soln. is kept at 1.3-1.9 and the solids content is also kept constant thoughout. Pref., the suspension density remains at 1.4-2.3 t/m3 though variation of the agglomerate feed, and the lixiviator mixture temp. is 60-80 deg.C., while sodium carbonate solution is also added, to give a constant 5-25 kg/m3 carbonate soln..</p> |
