The effect of sodium carbonate on flotation system of smithsonite with sodium oleate and its mechanism were investigated through flotation experiments, calculations of solution chemistry, Zeta potential tests and adsorption tests. The results of the micro-flotation experiments indicate that the floatability of smithsonite is very low using NaOH as pH above pH 10, and increasing the concentration of sodium carbonate can improve the flotation recovery of smithsonite clearly at pH 10.5. Carbonate mainly exists in the form of CO32- ions in pH range and can't absorb on the smithsonite surface, also can't improve the adsorption of sodium oleate on smithsonite surface. The froth stability of sodium oleate solution results indicate that foam layer is more stabilized with the increase of sodium carbonate concentration above pH 10. The experiment results of MIBC and pine oil indicated that the froth stability behavior of sodium oleate solution above pH 10 which is more likely caused by Na2CO3 improves smithsonite's floatability.%通过菱锌矿纯矿物浮选试验、溶液化学理论计算、动电位测试和吸附量测试,考察碳酸钠在油酸钠浮选菱锌矿体系中的影响.结果表明:在碱性条件下(pH>10),油酸钠浮选菱锌矿效果较差,当pH 10.5时,碳酸钠用量的增加能显著改善菱锌矿的可浮性.由泡沫稳定性测试可知,浮选体系三相泡沫层稳定性能随着碳酸钠浓度的增加而增强.结合起泡剂MIBC、松醇油实验说明,当pH>10时碳酸钠调浆能显著提高菱锌矿矿物的可浮性很可能是起到稳定油酸钠泡沫层作用.
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