某高炉瓦斯灰硫酸浸锌试验

Leaching Zinc with Sulfuric Acid from Blast Furnace Gas Ash

某高炉瓦斯灰粒度较细、成分较复杂,主要成分有氧化钙、赤铁矿、方解石、氧化锌、炭等,铁、锌、碳含量分别为27.44%、8.76%、13.51%,主要含锌矿物为氧化锌,含铁矿物为赤铁矿,碳主要以焦炭的形式存在。为确定硫酸浸取锌的合适硫酸浓度、液固比和浸出时间,进行了3因素3水平正交试验。结果表明,硫酸浓度对锌浸出率影响最显著,其次是液固比;在硫酸浓度为0.6 mo L/L、液固比为7 m L/g、浸出时间为25 min情况下硫酸浸锌,锌浸出率达97.03%。

The blast furnace gas ash has features of fine particle size and complex composition,and its main ingredients are calcium oxide,hematite,calcite,zinc oxide,carbon with the content of iron,zinc and carbon 27. 44%,8. 76% and 13. 51%respectively. The main zinc-containing is zinc oxide,iron-containing ore is hematite,and carbon mainly exists in the form of coke. In order to determine the appropriate sulfate concentration,solid-liquid ratio and leaching time of sulfuric acid leaching zinc,the 3 factors 3 levels orthogonal test was carried out. The results showed that the concentration of sulfuric acid played an important role in zinc leaching rate,followed by liquid-solid ratio; At the same time,it showed that when the sulfuric acid concentration was 0. 6 mo L / L,the liquid-solid ratio was 7 m L / g,leaching time was 25 min,the zinc leaching rate reached at97. 03%.