摘要
通过计算赤泥中所含金属氧化物与盐酸反应的吉布斯自由能,论证了两步盐酸酸浸提钪工艺的可行性。为使钪离子有高浸出率,同时与其他金属有较高的分离率,在二次酸浸中采用2.5 mol/L左右的低浓度盐酸开展了正交实验。使用Design-Expert 8.0软件对试验数据进行了分析,讨论了温度、时间、液固比、盐酸浓度对赤泥中各主要金属离子浸出的影响,建立了相应的多项式关联模型。确定的二次酸浸的最佳操作条件组合为:浸出温度为70℃,浸出时间为70 min,液固比为6,盐酸浓度为2.5 mol/L,在此条件下钪浸出率超过80%,铁、锆、钛等主要杂质离子浸出率维持在较低水平。
The Gibbs free energy of reaction between various metal oxides and hydrochloric acid,was calculated to explore the feasibility of two-step hydrochloric acid leaching for scandium recovery from red mud produced in Bayer process. In order to achieve a high leaching rate of scandium ion and a high selectivity of scandium against other metals,orthogonal experiments of secondary acid leaching with low-concentration hydrochloric acid of about 2. 5 mol/L were conducted. Design-Expert 8. 0 software was utilized to analyze the experimental data,and the impacts of key factors,i.e. temperature,time duration,liquid-solid ratio,hydrochloric acid concentration on the leaching rate of various metal ions were discussed. The corresponding polynomial models were also established. Finally,the optimum operating conditions were determined as follows: leaching temperature of 70 ℃,duration of 70 min,liquid solid ratio of 6 and HCl concentration of 2. 5 mol/L. A high leaching rate of more than 80% was achieved for scandium under such condition,while the leaching rates for the key impurities,i.e. Fe,Zr and Ti kept low.
作者
郝帅
李诚
席艺慧
李爱民
杨福胜
郭焱
HAO Shuai;LI Cheng;XI Yi-hui;LI Ai-min;YANG Fu-sheng;GUO Yan(Xi’an Jiaotong University,School of Chemical Engineering and Technology,Department of Process Equipment and Control Engineering,Xi’an 710049,China;Shanxi Institute of Rock Ore Test and Application,Taiyuan 030001,China;Xi’an Jiaotong University,School of Energy and Power Engineering,Department of Environmental Engineering,Xi’an 710049,China)
出处
《环境工程》
CAS
CSCD
北大核心
2021年第1期136-141,200,共7页
Environmental Engineering
基金
国家自然科学基金(21736008)。
关键词
赤泥
盐酸浸出
正交实验
吉布斯自由能
red mud
acid leaching
orthogonal experiment
Gibbs free energy
