A process was proposed to convert and separate selenium and arsenic in copper anode slime(CAS) by low-temperature alkali fusion process.Central composite design was employed to optimize the effective parameters,in whi...A process was proposed to convert and separate selenium and arsenic in copper anode slime(CAS) by low-temperature alkali fusion process.Central composite design was employed to optimize the effective parameters,in which Na OH/CAS mass ratio,fusion temperature and fusion time were selected as variables,and the conversion ratio of selenium and arsenic as responses.Second-order polynomial models of high significance and 3D response surface plots were constructed to show the relationship between the responses and the variables.Optimum area of >90% selenium conversion ratio and >90% arsenic conversion ratio was obtained by the overlaid contours at Na OH/CAS mass ratio of 0.65-0.75,fusion temperature of 803-823 K and fusion time of 20-30 min.The models are validated by experiments in the optimum area,and the results demonstrate that these models are reliable and accurate in predicting the fusion process.展开更多
Taking a copper anode slime as the raw material, a novel process for selenium extraction was studied. The primary selenium recovery can reach above 88.5% and the quality index of selenium product can be up to 99.5%. T...Taking a copper anode slime as the raw material, a novel process for selenium extraction was studied. The primary selenium recovery can reach above 88.5% and the quality index of selenium product can be up to 99.5%. The economic benefit resulted is remarkable and environment has been protected.展开更多
选用吉戎-Ⅱ生长獭兔随机分组,各组日粮中分别添加锌、铜、锰和硒,其中锌的添加量为0、40、80、120 m g/kg,硒为0、0.1、0.25、0.4、0.55、0.7 m g/kg,锰为0、5、15、25、35、45 m g/kg,铜为0、10、20、40、80、160 m g/kg。结果表明,4...选用吉戎-Ⅱ生长獭兔随机分组,各组日粮中分别添加锌、铜、锰和硒,其中锌的添加量为0、40、80、120 m g/kg,硒为0、0.1、0.25、0.4、0.55、0.7 m g/kg,锰为0、5、15、25、35、45 m g/kg,铜为0、10、20、40、80、160 m g/kg。结果表明,4种元素均能影响生长獭兔的生长性能。试验所选相关酶CuZn-SOD、GPX、M n-SOD、CP的活性能较好地反映此4种元素在獭兔体内的代谢状况。肾脏、肝脏中Zn和Se的沉积量能较好地反映饲粮Zn和Se在獭兔体内的沉积情况。胫骨和被毛中锰浓度则可以作为评价锰吸收利用率的敏感指标。综合各项指标得出,吉戎-Ⅱ獭兔日粮中锰、锌、铜、硒的适宜添加量分别为35、80、40、0.25 m g/kg。展开更多
原子荧光法测定水中硒时,铜元素的存在会对硒的测定造成干扰。该文通过大量试验优化条件参数,增加盐酸浓度或加入氯化铁溶液,总结出测定水中硒去除铜干扰的最佳条件,并对该条件下的精密度和准确度进行了评估。结果表明盐酸浓度20%或加入...原子荧光法测定水中硒时,铜元素的存在会对硒的测定造成干扰。该文通过大量试验优化条件参数,增加盐酸浓度或加入氯化铁溶液,总结出测定水中硒去除铜干扰的最佳条件,并对该条件下的精密度和准确度进行了评估。结果表明盐酸浓度20%或加入0.6 m L 10 g/L的氯化铁能有效抑制铜元素对硒的干扰,且操作简便、数据准确可靠。展开更多
基金Project(51234009)supported by the National Natural Science Foundation of ChinaProject(2014DFA90520)supported by International Cooperation Program of Ministry of Science of ChinaProject(2013A100003)supported by the Production,Teaching and Research Program of Guangdong Province,China
文摘A process was proposed to convert and separate selenium and arsenic in copper anode slime(CAS) by low-temperature alkali fusion process.Central composite design was employed to optimize the effective parameters,in which Na OH/CAS mass ratio,fusion temperature and fusion time were selected as variables,and the conversion ratio of selenium and arsenic as responses.Second-order polynomial models of high significance and 3D response surface plots were constructed to show the relationship between the responses and the variables.Optimum area of >90% selenium conversion ratio and >90% arsenic conversion ratio was obtained by the overlaid contours at Na OH/CAS mass ratio of 0.65-0.75,fusion temperature of 803-823 K and fusion time of 20-30 min.The models are validated by experiments in the optimum area,and the results demonstrate that these models are reliable and accurate in predicting the fusion process.
文摘Taking a copper anode slime as the raw material, a novel process for selenium extraction was studied. The primary selenium recovery can reach above 88.5% and the quality index of selenium product can be up to 99.5%. The economic benefit resulted is remarkable and environment has been protected.
文摘选用吉戎-Ⅱ生长獭兔随机分组,各组日粮中分别添加锌、铜、锰和硒,其中锌的添加量为0、40、80、120 m g/kg,硒为0、0.1、0.25、0.4、0.55、0.7 m g/kg,锰为0、5、15、25、35、45 m g/kg,铜为0、10、20、40、80、160 m g/kg。结果表明,4种元素均能影响生长獭兔的生长性能。试验所选相关酶CuZn-SOD、GPX、M n-SOD、CP的活性能较好地反映此4种元素在獭兔体内的代谢状况。肾脏、肝脏中Zn和Se的沉积量能较好地反映饲粮Zn和Se在獭兔体内的沉积情况。胫骨和被毛中锰浓度则可以作为评价锰吸收利用率的敏感指标。综合各项指标得出,吉戎-Ⅱ獭兔日粮中锰、锌、铜、硒的适宜添加量分别为35、80、40、0.25 m g/kg。
文摘原子荧光法测定水中硒时,铜元素的存在会对硒的测定造成干扰。该文通过大量试验优化条件参数,增加盐酸浓度或加入氯化铁溶液,总结出测定水中硒去除铜干扰的最佳条件,并对该条件下的精密度和准确度进行了评估。结果表明盐酸浓度20%或加入0.6 m L 10 g/L的氯化铁能有效抑制铜元素对硒的干扰,且操作简便、数据准确可靠。
