闪锌矿在碳酸钙存在下的低温氧化焙烧研究

摘要

在碳酸钙存在的条件下,对两种不同闪锌矿提出了预先低温氧化焙烧的处理方法.结果表明,在300℃焙烧3h时,锌品位为11.46％的1#矿样中的闪锌矿在焙烧过程中都转化成了易于溶出的ZnO,且硫与碳酸钙作用转化成了CaSO4,在45℃的NH3-(NH4)2SO4-H2O溶液中浸出1h,锌浸出率可达100.0％;而锌品位为49.25％的2#矿样相对1#矿样来说,矿物组成较为复杂,在相同试验条件下,锌浸出率仅为91.76％.%Pretreatment of oxidation roasting at low temperature with CaCO3 for two kinds of sphalerite was proposed.The results show that sphalerite in sample No.1 with 11.46％Zn is completely transformed into easily soluble ZnO,sulfur is fixed as CaSO4 by CaCO3when roasted at 300 ℃ for 3 h.Leaching rate of zinc in calcine of No.1 sample in NH3-(NH4)2SO4-H2O system at 45 ℃ for 1 h is 100.0％.However,for No.2 sample with 49.25％Zn,the leaching rate of zinc is only 91.76％ under the same conditions due to its complex mineral composition.