(1. 江西理工大學(xué) 冶金與化學(xué)工程學(xué)院，贛州341000；
2. 北京礦冶研究總院 冶金研究設(shè)計(jì)所，北京100160)
摘 要: 采用常壓浸出與加壓浸出相結(jié)合的方法，研究硫化鋅精礦在富氧硫酸體系中的常壓直接浸出動(dòng)力學(xué)。結(jié)果表明：鋅浸出受界面化學(xué)反應(yīng)控制，浸出反應(yīng)表觀活化能為(44.28±4.28) kJ/mol。浸出槽底部鋅的浸出速率遠(yuǎn)高于浸出槽上部鋅的浸出速率，且隨槽底礦漿壓力的增大，鋅的浸出速率明顯提高。進(jìn)一步基于收縮核模型，通過二次回歸方法，建立浸出槽底部鋅的浸出動(dòng)力學(xué)方程。在硫化鋅精礦常壓富氧直接浸出中，對(duì)于位于浸出槽底部的鋅浸出，溫度的影響明顯大于礦漿壓力的影響。
關(guān)鍵字: 硫化鋅精礦；硫酸；常壓直接浸出；富氧；動(dòng)力學(xué)
（1. School of Metallurgical and Chemical Engineering, Jiangxi University of Science and Technology,
Ganzhou 341000, China;
2. Institute of Metallurgy, Beijing General Research Institute of Mining and Metallurgy, Beijing 100160, China）
Abstract:The atmospheric direct leaching (ADL) kinetics of zinc sulfide concentrate in oxygen-rich sulfuric acid system was studied by the integration of atmospheric leaching and pressure leaching. The results show that the extraction of zinc is controlled by interface chemical reaction and the apparent activation energy of leaching reaction is calculated as (44.28±4.28) kJ/mol. The leaching rate of zinc at the bottom of ADL tank is much higher than that at the top of ADL tank and it is improved greatly with the increase of the slurry pressure at the bottom of ADL tank. The kinetic equation for zinc leaching at the bottom of ADL tank was further established by quadratic regression on the basis of shrinking core model. The influence of temperature on the extraction of zinc at the bottom of ADL tank is greater than that of slurry pressure.
Key words: zinc sulfide concentrate; sulfuric acid; atmospheric direct leaching; oxygen-rich; kinetics
