摘要
研究了以炼铅厂铅锌烟灰为原料,采用盐酸浸取并以高锰酸钾氧化铁锰、锌粉置换镉铅铜两步法生产氯化锌的新方法。以锌浸出率最高、铅浸出率最低、铁锰镉铅铜除杂最彻底为考察目标,通过实验找到最佳工艺条件:40 g铅锌烟灰在由71 m L浓盐酸和130 m L水配制的混酸中在30℃条件下浸取50 min,然后加入高锰酸钾0.017 g在10℃条件下继续反应2 h,过滤后的滤液中加入锌粉0.15 g在40℃条件下反应50 min,过滤得到浓度为1.65 mol/L的氯化锌溶液。在上述工艺条件下锌的浸出率为95.4%。用制备的氯化锌溶液生产氧化锌,杂质含量满足GB/T 19589—2004《纳米氧化锌》一级品要求。
A new technology of preparing zinc chloride with lead-zinc ash from a lead smelter plant as raw material was studied.The technology applied a two-step method as below：leaching from hydrochloric acid, oxidating Fe^2＋ and Mn^2＋ with potassium permanganate ,and replacing Cd^2＋ ,Pb^2＋ ,and Cu^2＋ by zinc powder.To get the highest leaching rate of zinc ,the lowest leaching rate of impurity Pb, and the thoroughly removing of Fe, Mn, Pb, Cd, and Cu elements, the optimum experimental acid leaching and purification conditions were obtained as follows： after40glead-zinc ash,was leached bythe mixed acid （71 mL concentrated hydrochloric acid and 130 mL water） for 50 min at 30 ℃ ,0.017 g KMnO4 was added into the solution to continue the reaction for 2 h at 10 ℃ ,and then 0.15 g Zn powder was added into the filtration and let the replacement reaction go at 40 ℃ for 50 min ,and finally the zinc chloride solution with the concentration of 1.65 mol/L was obtained. Under above condi- tions, the leaching rate of zinc was 95.4%.The obtained zinc chloride solution was used for the preparation of zinc oxide and the impurity ion content met the requirement of the first grade of Nano-sized Zinc Oxide, GB/T 19589--2004.
出处
《无机盐工业》
CAS
北大核心
2015年第3期49-51,共3页
Inorganic Chemicals Industry
关键词
酸浸
锌灰
氯化锌
氧化
置换
acid leaching
zinc ash
zinc chloride
oxidation
replacement
