Journal of Hazardous Materials ( IF 9.038 ) Pub Date : 2021-02-09 , DOI: 10.1016/j.jhazmat.2021.125365 Jianrong Xue; Dongping Long; Hong Zhong; Shuai Wang; Lihua Liu
In view of reducing contaminant and recovery arsenic and antimony, a novel technology was proposed to recover arsenic and antimony from arsenic-rich copper smelter dust comprehensively. The technique route includes three stages: arsenic and antimony trioxides were leached from the copper smelter dust with hydrochloric acid; trivalent arsenic ions (As3+) were then reduced to less toxic simple arsenic (As) by sodium hypophosphate (NaH2PO2) and recovered; and stepwise recovery of antimony by SbCl3 was achieved by the continuous distillation technique. The results indicates that the leaching efficiency of As and Sb was over 97.5% and 96.8% under conditions of initial 4.0 mol/L HCl, liquid-solid ratio (L/S) of 6:1, leaching temperature of 363 K and time of 2 h. Over 92.5% arsenic was recovered by NaH2PO2 reduction under the suitable conditions: 363 K, 1.5 h and 2.0 times addition of NaH2PO2. The recovery rate of Sb is more than 97.53% at 393 K. The distillation temperature of SbCl3 was optimized between 463 K and 473 K. The corresponding mechanisms of the leaching and recovering of arsenic and antimony were systematically investigated and confirmed by E-pH diagram, thermodynamic calculation, arsenic speciation, composition analysis and XRD characterization.
鉴于减少污染物并回收砷和锑，提出了一种从富含砷的铜冶炼厂粉尘中综合回收砷和锑的新技术。该工艺路线包括三个阶段：用盐酸从铜冶炼厂的粉尘中浸出砷和三氧化二锑。然后通过次磷酸钠（NaH 2 PO 2）将三价砷离子（As 3+）还原为毒性较小的简单砷（As ）并回收；SbCl 3逐步回收锑通过连续蒸馏技术实现。结果表明，在初始4.0 mol / L HCl，液固比（L / S）为6：1，浸出温度为363 K，浸出时间为4：1的条件下，As和Sb的浸出效率分别达到97.5％和96.8％以上。 2小时 超过92.5％的砷被回收的NaH 2 PO 2 363 K，1.5小时和时间加入NaH 2.0：在合适的条件下还原2 PO 2。SbCl 3的蒸馏温度为393 K时，Sb的回收率大于97.53％。 在463 K和473 K之间进行了优化。通过E-pH图，热力学计算，砷形态，组成分析和XRD表征，系统研究了砷和锑的浸出和回收的相应机理。