| 摘要 |
<p>FIELD: metallurgy. ^ SUBSTANCE: method consists in dissolving solubilisated components of ore by means of carrying out two or more successive stages of leaching. The first stage includes leaching at atmospheric pressure (AL), while during the second stage leaching is performed under (HPAL) pressure. In the course of this combined process average fraction of ore (0.075-0.5 mm) (1) is subjected to leaching under atmospheric pressure (AL) thereby producing flow (3) of high dissolved iron, aluminium and residual acid concentration. This said flow (3) is supplied to the next stage of leaching under pressure (HPAL) of fine fraction of ore (<0.075 mm) (4); contained free acid is re-used. Reaction of hydrolysis of iron and aluminium sulphates causes sedimentation of iron and aluminium and, thereby, regeneration of sulphuric acid. ^ EFFECT: reduced amount of consumed acid used for leaching. ^ 7 cl, 4 dwg</p> |
