研究在硝/硫混酸体系中浸出铜阳极泥中硒的动力学和影响硒的浸出过程的主要参数。结果表明,硒的浸出速率与搅拌速度无关,而与浸出温度以及硫酸和硝酸的浓度相关。硒的浸出包括两个阶段:在第一阶段,硒的浸出活化能为103.5 k J/mol,硒的...研究在硝/硫混酸体系中浸出铜阳极泥中硒的动力学和影响硒的浸出过程的主要参数。结果表明,硒的浸出速率与搅拌速度无关,而与浸出温度以及硫酸和硝酸的浓度相关。硒的浸出包括两个阶段:在第一阶段,硒的浸出活化能为103.5 k J/mol,硒的浸出主要由化学反应控制,硒的浸出与硫酸浓度无关,而与硝酸浓度相关,其反应级数为0.5613;在第二阶段,硒的浸出活化能为30.6 k J/mol,硒的浸出由扩散和化学反应混合控制。此时,硒的浸出与硝酸的浓度基本无关。展开更多
An efficient approach for lead extraction from waste funnel glass through the lead smelting process has been proposed. To clarify the effect of funnel glass addition on the degradation of magnesia-chromite refractorie...An efficient approach for lead extraction from waste funnel glass through the lead smelting process has been proposed. To clarify the effect of funnel glass addition on the degradation of magnesia-chromite refractories by ZnO-containing fayalite slag, the corrosion behavior of magnesia-chromite refractories in lead smelting slags with different funnel glass additions from 0wt% to 40wt% was tested. Scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDS) was used to acquire the microstructural information of the worn refractory samples. Experimental results showed that the corrosion of magnesia-chromite refractory consisted predominantly of the dissolution of MgO into slag. ZnO and FeO reacted with periclase and chromite to form (Zn,Fe,Mg)O solid solution and (Zn,Fe,Mg)(Fe,Al,Cr)2O4 spinel, respectively. With the addition of funnel glass, the solubility of MgO increased whereas ZnO levels remained stable, thereby resulting in a reduced Mg content and an elevated Zn and Fe content in the (Zn,Fe,Mg)O solid solution and the (Zn,Fe,Mg)(Fe,Al,Cr)2O4 spinel. Considering the stability of the (Zn,Fe,Mg)O solid solution layer and the penetration depth of the slag, the optimal funnel glass addition for lead smelting was found to be 20wt%.展开更多
An effective process for recycling lead from hazardous waste cathode ray tubes(CRTs) funnel glass through traditional lead smelting has been presented previously. The viscous behavior of the molten high lead slag, w...An effective process for recycling lead from hazardous waste cathode ray tubes(CRTs) funnel glass through traditional lead smelting has been presented previously. The viscous behavior of the molten high lead slag, which is affected by the addition of funnel glass, plays a critical role in determining the production efficiency. Therefore, the viscosities of the CaO–SiO_2–"FeO"–12wt%ZnO–3wt%Al_2O_3 slags were measured in the current study using the rotating spindle method. The slag viscosity decreases as the CaO/SiO_2 mass ratio is increased from 0.8 to 1.2 and also as the FeO content is increased from 8wt% to 20wt%. The breaking temperature of the slag is lowered substantially by the addition of FeO, whereas the influence of the CaO/SiO_2 mass ratio on the breaking temperature is complex. The structural analysis of quenched slags using Fourier transform infrared(FTIR) spectroscopy and Raman spectroscopy reveals that the silicate network structure is depolymerized with increasing CaO/SiO_2 mass ratio or increasing FeO content. The [FeO_6]-octahedra in the slag melt increase as the CaO/SiO_2 mass ratio or the FeO content increases. This increase can further decrease the degree of polymerization(DOP) of the slag. Furthermore, the activation energy for viscous flow decreases both with increasing CaO/SiO_2 mass ratio and increasing FeO content.展开更多
基金Project(U1608254) supported by the Special Fund for the National Natural Science Foundation of ChinaProjects(ZJKY2017(B)KFJJ01,ZJKY2017(B)KFJJ02) supported by Zijin Mining Group Co.,Ltd.,China
基金Projects(51374066,U1608254) supported by the National Natural Science Foundation of ChinaProject(2014BAC03B07) supported by the National Key Technology R&D Program of ChinaProjects(2012223002,2014020037) supported by Industrial Research Projects in Liaoning Province,China
文摘研究在硝/硫混酸体系中浸出铜阳极泥中硒的动力学和影响硒的浸出过程的主要参数。结果表明,硒的浸出速率与搅拌速度无关,而与浸出温度以及硫酸和硝酸的浓度相关。硒的浸出包括两个阶段:在第一阶段,硒的浸出活化能为103.5 k J/mol,硒的浸出主要由化学反应控制,硒的浸出与硫酸浓度无关,而与硝酸浓度相关,其反应级数为0.5613;在第二阶段,硒的浸出活化能为30.6 k J/mol,硒的浸出由扩散和化学反应混合控制。此时,硒的浸出与硝酸的浓度基本无关。
基金financially supported by the National Key R&D Program of China (No. 2018YFC1902004)the National Natural Science Foundation of China (No. U1608254)+1 种基金the Project for Guangdong Collaborative Innovation and Platform Environment Building (No. 2017B090904035)the Special Project for Key Laboratory of Guangdong Science and Technology Department, China (No. 2017B030314046)
文摘An efficient approach for lead extraction from waste funnel glass through the lead smelting process has been proposed. To clarify the effect of funnel glass addition on the degradation of magnesia-chromite refractories by ZnO-containing fayalite slag, the corrosion behavior of magnesia-chromite refractories in lead smelting slags with different funnel glass additions from 0wt% to 40wt% was tested. Scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDS) was used to acquire the microstructural information of the worn refractory samples. Experimental results showed that the corrosion of magnesia-chromite refractory consisted predominantly of the dissolution of MgO into slag. ZnO and FeO reacted with periclase and chromite to form (Zn,Fe,Mg)O solid solution and (Zn,Fe,Mg)(Fe,Al,Cr)2O4 spinel, respectively. With the addition of funnel glass, the solubility of MgO increased whereas ZnO levels remained stable, thereby resulting in a reduced Mg content and an elevated Zn and Fe content in the (Zn,Fe,Mg)O solid solution and the (Zn,Fe,Mg)(Fe,Al,Cr)2O4 spinel. Considering the stability of the (Zn,Fe,Mg)O solid solution layer and the penetration depth of the slag, the optimal funnel glass addition for lead smelting was found to be 20wt%.
基金financially supported by the National Natural Science Foundation of China (Nos. 51374066 and 51304047)the National Key Technologies R&D Program (No. 2014BAC03B07)the Industrial Research Projects in Liaoning Province, China (Nos. 2012223002 and 2014020037)
文摘An effective process for recycling lead from hazardous waste cathode ray tubes(CRTs) funnel glass through traditional lead smelting has been presented previously. The viscous behavior of the molten high lead slag, which is affected by the addition of funnel glass, plays a critical role in determining the production efficiency. Therefore, the viscosities of the CaO–SiO_2–"FeO"–12wt%ZnO–3wt%Al_2O_3 slags were measured in the current study using the rotating spindle method. The slag viscosity decreases as the CaO/SiO_2 mass ratio is increased from 0.8 to 1.2 and also as the FeO content is increased from 8wt% to 20wt%. The breaking temperature of the slag is lowered substantially by the addition of FeO, whereas the influence of the CaO/SiO_2 mass ratio on the breaking temperature is complex. The structural analysis of quenched slags using Fourier transform infrared(FTIR) spectroscopy and Raman spectroscopy reveals that the silicate network structure is depolymerized with increasing CaO/SiO_2 mass ratio or increasing FeO content. The [FeO_6]-octahedra in the slag melt increase as the CaO/SiO_2 mass ratio or the FeO content increases. This increase can further decrease the degree of polymerization(DOP) of the slag. Furthermore, the activation energy for viscous flow decreases both with increasing CaO/SiO_2 mass ratio and increasing FeO content.