At a time when the world is practicing energy conservation and emission reduction in order to achieve carbon neutrality, it is particularly important to enhance the extraction of valuable metals from low-grade resources. In the current process of extracting valuable metals from limonitic laterite, the characteristic that the laterite is a highly porous mineral is often overlooked. Inspired by our previous studies on the porous kinetics of limonitic laterite during nitric acid pressure leaching, this paper investigated the enhanced recovery of nickel from limonitic laterite. Response surface methodology was first used to optimize the nitric acid pressure leaching limonitic laterite process parameters to obtain the optimum conditions (Temperature: 194 °C, Time: 75 min, Liquid/Solid: 3.4 mL/g, and the initial nitric acid concentration: 178 g/L). Based on this process condition, two enhancement options were performed, namely bleed air treatment and adding surfactant. The results showed that both bleed air treatment and the addition of surfactant promoted the leaching of limonitic laterite. The best enhancement was achieved by DTAB (dodecyl trimethyl ammonium bromide), with a 5.22% increase in nickel extraction under optimal process conditions (from 90.63% to 95.85%). Furthermore, the analysis of the reinforcement mechanism shows that the bleed air treatment mainly removes the obstruction of the leaching reaction by the air in the pore, thus accelerating the reaction. The reinforcing effect of surfactants is mainly based on improved diffusion efficiency and increased permeability.

在全球为实现碳中和而进行节能减排的当下，加强从低品位资源中提取有价金属显得尤为重要。在目前从褐铁矿红土中提取有价金属的过程中，往往忽视了红土是一种高孔隙率矿物的特性。受我们之前对硝酸加压浸出过程中褐铁矿红土的多孔动力学研究的启发，本文研究了从褐铁矿红土中提高镍的回收率。首次采用响应面法对硝酸加压浸出褐铁矿红土矿工艺参数进行优化，得到最佳条件（温度：194℃，时间：75min，液固比：3.4mL/g，初始硝酸浓度： 178 克/升）。基于此工艺条件，执行了两个增强选项，即引气处理和添加表面活性剂。结果表明，引气处理和添加表面活性剂均促进了褐铁矿红土的浸出。DTAB（十二烷基三甲基溴化铵）实现了最佳增强效果，在最佳工艺条件下镍提取量增加了 5.22%（从 90.63% 到 95.85%）。此外，强化机理分析表明，排气处理主要是消除孔隙中空气对浸出反应的阻碍，从而加速反应。表面活性剂的增强作用主要基于提高扩散效率和增加渗透性。即引气处理和添加表面活性剂。结果表明，引气处理和添加表面活性剂均促进了褐铁矿红土的浸出。DTAB（十二烷基三甲基溴化铵）实现了最佳增强效果，在最佳工艺条件下镍提取量增加了 5.22%（从 90.63% 到 95.85%）。此外，强化机理分析表明，排气处理主要是消除孔隙中空气对浸出反应的阻碍，从而加速反应。表面活性剂的增强作用主要基于提高扩散效率和增加渗透性。即引气处理和添加表面活性剂。结果表明，引气处理和添加表面活性剂均促进了褐铁矿红土的浸出。DTAB（十二烷基三甲基溴化铵）实现了最佳增强效果，在最佳工艺条件下镍提取量增加了 5.22%（从 90.63% 到 95.85%）。此外，强化机理分析表明，排气处理主要是消除孔隙中空气对浸出反应的阻碍，从而加速反应。表面活性剂的增强作用主要基于提高扩散效率和增加渗透性。DTAB（十二烷基三甲基溴化铵）实现了最佳增强效果，在最佳工艺条件下镍提取量增加了 5.22%（从 90.63% 到 95.85%）。此外，强化机理分析表明，排气处理主要是消除孔隙中空气对浸出反应的阻碍，从而加速反应。表面活性剂的增强作用主要基于提高扩散效率和增加渗透性。DTAB（十二烷基三甲基溴化铵）实现了最佳增强效果，在最佳工艺条件下镍提取量增加了 5.22%（从 90.63% 到 95.85%）。此外，强化机理分析表明，排气处理主要是消除孔隙中空气对浸出反应的阻碍，从而加速反应。表面活性剂的增强作用主要基于提高扩散效率和增加渗透性。