(中南大學 資源加工與生物工程學院，長沙 410083)
摘 要: 為了降低經物理分選后的高爐精泥中鋅的含量，對高爐精泥進行化學浸出除鋅研究，考察浸出劑、浸出時間、溫度、液固比和攪拌速度等對浸出的影響，并進行理論分析。結果表明：硫酸對鋅的浸出率最高，氯化鐵次之，氨水最低；在合適的浸出條件下：液固比8׃1，溫度
關鍵字: 高爐塵泥；除鋅；循環(huán)利用；動力學；浸出
（School of Resources Processing and Bioengineering, Central South University, Changsha 410083, China）
Abstract:Chemical leaching zinc from blast furnace dust concentrate (BFDC) treated by physical separation was investigated in order to reduce the content of zinc, and all common operating factors, such as leaching duration, temperature, ratio of liquid to solid and stirring rate, have tested. The results show that among the three leaching chemicals tested (sulfuric acid, ferric chloride and amine) sulfuric acid is the best one for leaching zinc. A zinc leaching rate of 73.9% is achieved and resultantly the content of zinc in the product is reduced from 1.46% to 0.38% under the following proper leaching conditions: ratio of liquid to solid 8׃1, room temperature (about 20 ℃), acid concentration of 125 g/L, leaching time 35 min and stirring rate 150 r/min. The kinetics and reaction mechanism of zinc acid leaching indicate that the leaching reaction conforms to the equation: 1−2α/3−(1−α)2/3=kt, the activation energy for the sulfuric acid leaching is 8.89 kJ/mol, and the leaching process is controlled by diffusion.
Key words: blast furnace dust; zinc removal; recycling; kinetics; leaching
