A technology for recovering indium from Jinchuan copper-smelting ash was developed. Indium in the ash was first enriched to the leaching-slag in leaching process,and then recovered by sulfating roasting. The method in...A technology for recovering indium from Jinchuan copper-smelting ash was developed. Indium in the ash was first enriched to the leaching-slag in leaching process,and then recovered by sulfating roasting. The method included mixing the leaching-slag with sulfuric acid,making them into particles,roasting the mixture,and then leaching the calcine with hot water. Above 90% of indium in calcine could be dissolved into the leaching solution. The optimized conditions were determined as follows： the mass ratio of sulfuric acid to leaching slag was 0.1,the roasting time was about 1 to 1.5 h in the temperature range of 200-250℃,and the calcine was leached for 1 h with 5：1 of liquid/solid ratio at 60℃. Over 99% of indium in leaching solution was finally enriched by Zn substitution or sulfide precipitation.展开更多
An efficient and reliable approach based on solvent extraction to selectively recover copper from leaching solution of Jinchuan copper smelting ash has been developed in this work.And the extraction isotherm of 50%((?...An efficient and reliable approach based on solvent extraction to selectively recover copper from leaching solution of Jinchuan copper smelting ash has been developed in this work.And the extraction isotherm of 50%((?)) N902 with initial aqueous acidity of 19.6 g/L was determined at 25℃.The results show that the extractant,N902,has good selectivity to copper, and its saturated capacity of copper under the given conditions is over 23 g/L.The recovery rate of copper in the extraction is over 99%.And copper extraction equilibrium is reached in 90 s using 50% N902 with kerosene as the diluenting agent at an organic and aqueous volume phase ratio(O/A)of 1.Furthermore,over 99.5% of the loaded copper in the organic phase could be stripped by applying 196 g/L H_2SO_4 as the stripping agent.展开更多
The results of investigation to assess the possibility of copper slag with high MgO to be used as a mineral admixture in concrete were reported in this study. The soundness of cement paste containing the slag has been...The results of investigation to assess the possibility of copper slag with high MgO to be used as a mineral admixture in concrete were reported in this study. The soundness of cement paste containing the slag has been examined by autoclave test. Pozzolanic activity of the slag was studied in comparison to fly ash. The slag was mixed calcium hydroxide and water,and the progress of the pozzolanic reaction was determined by X-ray diffraction,differential thermal analysis-thermogravimetry and scanning electron microscopy from 28 to 90 d. The experimental results showed that the autoclave expansion value of cement paste containing the slag was far below the expansion limit (0.8%). It can be conclude that the slag has little periclase content. The consumption of calcium hydroxide showed the slag exhibits high pozzolanic activity,which was higher than that of fly ash. Hence,use of the copper slag with high MgO but low periclase content as a mineral admixture in concrete seems feasible.展开更多
以锌冶炼过程中的铜烟灰为原料,研究了硫酸浸出含铟铜烟灰过程中硫酸浓度、硫酸用量、浸出温度、浸出时间、氧化剂高锰酸钾用量等因素对铟浸出效果的影响。结果表明,当硫酸浓度300 g/L、液固比6 m L/g、反应温度90℃、反应时间5 h、高...以锌冶炼过程中的铜烟灰为原料,研究了硫酸浸出含铟铜烟灰过程中硫酸浓度、硫酸用量、浸出温度、浸出时间、氧化剂高锰酸钾用量等因素对铟浸出效果的影响。结果表明,当硫酸浓度300 g/L、液固比6 m L/g、反应温度90℃、反应时间5 h、高锰酸钾添加量0.3%时,铜烟灰中铟浸出率为65.73%。展开更多
文摘A technology for recovering indium from Jinchuan copper-smelting ash was developed. Indium in the ash was first enriched to the leaching-slag in leaching process,and then recovered by sulfating roasting. The method included mixing the leaching-slag with sulfuric acid,making them into particles,roasting the mixture,and then leaching the calcine with hot water. Above 90% of indium in calcine could be dissolved into the leaching solution. The optimized conditions were determined as follows： the mass ratio of sulfuric acid to leaching slag was 0.1,the roasting time was about 1 to 1.5 h in the temperature range of 200-250℃,and the calcine was leached for 1 h with 5：1 of liquid/solid ratio at 60℃. Over 99% of indium in leaching solution was finally enriched by Zn substitution or sulfide precipitation.
文摘An efficient and reliable approach based on solvent extraction to selectively recover copper from leaching solution of Jinchuan copper smelting ash has been developed in this work.And the extraction isotherm of 50%((?)) N902 with initial aqueous acidity of 19.6 g/L was determined at 25℃.The results show that the extractant,N902,has good selectivity to copper, and its saturated capacity of copper under the given conditions is over 23 g/L.The recovery rate of copper in the extraction is over 99%.And copper extraction equilibrium is reached in 90 s using 50% N902 with kerosene as the diluenting agent at an organic and aqueous volume phase ratio(O/A)of 1.Furthermore,over 99.5% of the loaded copper in the organic phase could be stripped by applying 196 g/L H_2SO_4 as the stripping agent.
文摘The results of investigation to assess the possibility of copper slag with high MgO to be used as a mineral admixture in concrete were reported in this study. The soundness of cement paste containing the slag has been examined by autoclave test. Pozzolanic activity of the slag was studied in comparison to fly ash. The slag was mixed calcium hydroxide and water,and the progress of the pozzolanic reaction was determined by X-ray diffraction,differential thermal analysis-thermogravimetry and scanning electron microscopy from 28 to 90 d. The experimental results showed that the autoclave expansion value of cement paste containing the slag was far below the expansion limit (0.8%). It can be conclude that the slag has little periclase content. The consumption of calcium hydroxide showed the slag exhibits high pozzolanic activity,which was higher than that of fly ash. Hence,use of the copper slag with high MgO but low periclase content as a mineral admixture in concrete seems feasible.
文摘在分析铜烟灰物料组成的基础上,采用硫酸浸出工艺,分别考查了硫酸加入量、液固比、浸出时间和浸出温度对铜浸出率的影响。实验得出最佳浸出条件为:硫酸初始加入量98 g/L,浸出时间60 min,浸出温度70℃,液固比5∶1。在此条件下,铜浸出率达到84.87%。研究了炼铜烟灰硫酸浸出过程中铜的浸出动力学。结果表明,硫酸浸出过程为扩散控制,浸出反应的表观活化能为8.05 k J/mol。
