Study on the leaching behavior of antimony in stibnite under the action of different oxidants

In order to investigate the release process of antimony from stibnite under the leaching effect of rain and snow in Hunan Xikuangshan(XKS) mining area, some important environmental factors are selected: dissolved oxygen, Fe(III) and Pseudomonas sp. AO-1 (referred to as AO-1). The one-factor batch sequence experimental method is adopted to study the change law of pH, Sb(III), Sb(V) under different oxidizing conditions. The results show that dissolved oxygen, Fe(III) and AO-1 all can promote the dissolution and release of antimony, in which dissolved oxygen and AO-1 mainly affected the release process of antimony, while Fe(III) mainly affected the oxidation process of antimony. During the process, biomineralization occurs and produces (NH₄)Mg(PO₄)-6H₂O and NaSb(OH)₆. The common effect of AO-1 and Fe(III) can obviously promote the dissolution and oxidation of stibnite. The release rate of antimony under different oxidizing agents are as follows: AO-1&Fe(III) > Fe(III) > AO-1 > Dissolved Oxygen.