In this study, the role of (NH₄)₂SO₄ during the sulfurization of azurite and its response to flotation were investigated. The flotation results showed that adding (NH₄)₂SO₄ prior to sulfurization decreased the formation of colloid in flotation pulp, and the floatability of the suppressed azurite caused by excess sodium sulfide was restored. After adding (NH₄)₂SO₄ prior to sulfurization, the formation of Cu(NH₃)_n²⁺ intermediate products changed the path of the sulfurization reaction, which slowed the direct impact of HS⁻ on the azurite surface. The nucleation rate was reduced, and the growth of copper sulfide crystal was improved. Covellite (syn, CuS) with larger crystal grains was formed on the azurite surface, thereby enhancing the mechanical stability of copper sulfide products onto the mineral surface. Therefore, the generated copper sulfide colloid significantly reduced, ultimately promoting the effective adsorption of xanthate on the azurite surface.

在这项研究中，研究了 (NH ₄ ) ₂ SO ₄在蓝铜矿硫化过程中的作用及其对浮选的响应。浮选结果表明，在硫化前加入(NH ₄ ) ₂ SO ₄可减少浮选矿浆中胶体的形成，并恢复因硫化钠过量引起的抑制蓝铜矿的可浮性。在硫化前加入(NH ₄ ) ₂ SO ₄后，Cu(NH ₃ ) _n ²⁺中间产物的形成改变了硫化反应的路径，减缓了HS的直接影响^-在蓝铜矿表面。成核率降低，硫化铜晶体生长得到改善。蓝铜矿表面形成了晶粒较大的铜蓝（syn，CuS），从而增强了硫化铜产品在矿物表面的机械稳定性。因此，生成的硫化铜胶体显着减少，最终促进了黄药在蓝铜矿表面的有效吸附。