针对低品位硫氧混合锌矿含钙高的特点，在低温下对其进行氧化焙烧，通过控制气相中的硫势和氧势，使矿石的矿相发生转变，促进锌在氨性体系中溶解；同时利用矿石中钙的固硫作用，使硫转化成CaSO4，有效避免SO2对环境的污染. 结果表明，锌品位为5.45%的硫氧混合锌矿在300℃下焙烧3 h，矿石中的异极矿和闪锌矿转化成了易溶出的ZnO，方铅矿和黄铁矿分别转化成了PbSO4和Fe2O3，方解石转化成了CaSO4，所得焙砂在NH3?(NH4)2SO4?H2O体系中45℃下浸出，锌浸出率可达73.27%；焙烧温度大于300℃时，焙砂中会产生大量铁酸锌，使锌浸出率下降.
Based on the characteristics of high calcium content, the low-grade sulfide and oxide mixed zinc ore was treated via an oxidation roasting at low temperatures by controlling the sulfur and oxygen potentials in the gas phase to make the transformation of zinc-bearing mineral phases and promote the dissolution of zinc in the ammonia system. At the same time, sulfur in the ore could be transformed into CaSO4 in the presence of CaCO3 and the pollution of SO2 to environment could be effectively avoid. The results showed that when the mixed zinc ore with a Zn content of 5.45% roasting at 300℃ for 3 h, the hemimorphite and sphalerite in the ore were transformed into easily soluble ZnO, while the galena, pyrite and calcite were transformed into PbSO4, Fe2O3 and CaSO4, respectively. The obtained calcine was leached with NH3?(NH4)2SO4?H2O system at 45℃ and the zinc leaching rate was up to 73.27%. When the temperature was higher than 300℃, however, a large amount of franklinite would be produced in the calcine, resulting in a decrease in the leaching rate of zinc.
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