This study aimed to investigate the suitability of sodium polyacrylate (PAAS) as a pyrite depressant in a Cu-S separation system through flotation and adsorption experiments. Micro-flotation tests showed that chalcopyrite was selectively separated from pyrite using PAAS as a pyrite depressant in the pH range 2–4. A satisfactory separation effect, a copper concentrate with 30.02% Cu and a recovery of 94.16% was obtained in artificial mixed minerals tests. Adsorption studies showed that PAAS selectively adsorbed on pyrite in the pH range 2–4, while the adsorption on chalcopyrite was weaker, about 6.6 times lower than that on pyrite. PAAS adsorption on pyrite occurred through the interaction between (R-COO⁻)_n and Fe(OH)_n⁽³⁻ⁿ⁾⁺ at the solid/liquid interface. Oxidation pretreatment promoted the adsorption of Fe(OH)_n⁽³⁻ⁿ⁾⁺ on pyrite, thus providing additional adsorption sites for PAAS and enhancing the adsorption of PAAS on pyrite. After PAAS adsorption, the weak floatability of pyrite in the presence of xanthate was due to the strong hydrophilicity imparted to pyrite by PAAS rather than hindering xanthate adsorption on pyrite.

本研究旨在通过浮选和吸附实验研究聚丙烯酸钠 (PAAS) 作为黄铁矿抑制剂在 Cu-S 分离系统中的适用性。微浮选试验表明，使用 PAAS 作为黄铁矿抑制剂，在 2-4 的 pH 范围内，黄铜矿可以从黄铁矿中选择性地分离出来。人工混合矿物试验获得了满意的分离效果，铜精矿含铜30.02%，回收率94.16%。吸附研究表明，PAAS 在 2-4 范围内选择性吸附在黄铁矿上，而对黄铜矿的吸附较弱，约为黄铁矿的 6.6 倍。^{PAAS 在黄铁矿上的吸附是通过 (R-COO -} ) _n和 Fe(OH) _n ^(3-n)+之间的相互作用发生的在固/液界面。氧化预处理促进了 Fe(OH) _n ⁽³⁻ⁿ⁾⁺在黄铁矿上的吸附，从而为 PAAS 提供了额外的吸附位点，增强了 PAAS 在黄铁矿上的吸附。PAAS吸附后，黄铁矿在黄药存在下的较弱可浮性是由于PAAS赋予黄铁矿的强亲水性，而不是阻碍黄药在黄铁矿上的吸附。