A comprehensive contrast of ore-forming geological background and ore-forming fluid features, especially fluid ore-forming processes, has been performed between the Tianmashan and the Datuanshan ore deposits in Tongli...A comprehensive contrast of ore-forming geological background and ore-forming fluid features, especially fluid ore-forming processes, has been performed between the Tianmashan and the Datuanshan ore deposits in Tongling, Anhui Province. The major reasons for the formation of the stratabound skarn Au-S ore deposit in Tianmashan and the stratabound skarn Cu ore deposit in Datuanshan are analyzed in accordance with this contrast. The magmatic pluton in Tianmashan is rich in Au and poor in Cu, but that in Datuanshan is rich in Cu and Au. The wallrock strata in Tianmashan contain Au-bearing pyrite layers with some organic substance but those in Datuanshan contain no such layers. Moreover, the ore-forming fluids in Tianmashan are dominantly magmatic ones at the oxide and sulfide stages, but those with high content of Cu in Datuanshan are mainly groundwater fluids. In addition, differences in compositional evolution and physicochemical condition variation of the ore-forming fluids result in gradual dispersion展开更多
The continuous expansion of vinyl chloride production increases environmental pollution caused by mercury catalysts,which is an issue that urgently needs to be solved.Green and stable catalysts should be researched to...The continuous expansion of vinyl chloride production increases environmental pollution caused by mercury catalysts,which is an issue that urgently needs to be solved.Green and stable catalysts should be researched to alleviate this issue.In this research,Thiolactic acid acts as a ligand where sulfhydryl groups form a stable complex with Au on the surface of a spherical activated carbon(SAC).An Au-thiolactic acid/SAC catalyst was designed with a Au theoretical loading of 0.5%(mass)to overcome the disadvantages of traditional Au-based catalysts,such as a low conversion rate and poor life cycle.The ratio of Au to ligand was screened,and the activity was best when Au/S=1:8.The formation of the Au-S bond was proven by FT-IR and UV-vis.The longevity test of the Au1 S8/SAC catalyst was carried out at 1200 h^(-1) for 50 h.Samples with reaction times of 0 h,5 h,10 h,20 h,and 50 h were taken to monitor the catalyst status.The XPS and TPR tests proved that the Au-S bond broke as the acetylene hydrochlorination reaction proceeded,The DFT calculation proved that the Au-S bond is the active site,and the sulfur atom promotes the adsorption of C_(2)H_(2) by the catalyst.展开更多
金铜合金作为金基合金钎焊料在电子工业电真空器件的焊接中发挥关键作用。本文采用真空感应熔炼方法制备金铜合金铸锭,通过冷轧使铸锭发生塑性变形,并结合后续的不同热处理工艺,研究了大变形量（－90%）的金铜合金在不同热处理条件下的...金铜合金作为金基合金钎焊料在电子工业电真空器件的焊接中发挥关键作用。本文采用真空感应熔炼方法制备金铜合金铸锭,通过冷轧使铸锭发生塑性变形,并结合后续的不同热处理工艺,研究了大变形量（－90%）的金铜合金在不同热处理条件下的固态相转变过程;采用光学显微镜（OM）、扫描电镜（SEM）对微观组织进行观察,发现冷变形金铜合金在673－723 K温度范围发生回复,在748－923 K发生再结晶,在923 K以上出现再结晶晶粒长大现象;随后,采用差示扫描量热法（DSC）研究了再结晶组织在连续升温-降温过程中的相转变,即升温过程中发生无序相→Au Cu I→Au Cu II→无序相的转变;而降温过程仅发生了无序相→Au Cu I相的直接转变。利用X射线衍射仪（XRD）发现再结晶组织为金的固熔体结构,而在无序-有序相Au Cu I的转变温度区间,其快淬组织为四方结构的Au Cu I结构;随后,采用高分辨透射电镜（HRTEM）观察证实了此结构,且认为该合金在临界温度以下确实存在有序相的转变。展开更多
基金financially supported by the Ministry of Science and Technology of China(Grant No.1999043206)the National Natural Science Foundation of China(Grant Nos.40272034 and 40133020).
文摘A comprehensive contrast of ore-forming geological background and ore-forming fluid features, especially fluid ore-forming processes, has been performed between the Tianmashan and the Datuanshan ore deposits in Tongling, Anhui Province. The major reasons for the formation of the stratabound skarn Au-S ore deposit in Tianmashan and the stratabound skarn Cu ore deposit in Datuanshan are analyzed in accordance with this contrast. The magmatic pluton in Tianmashan is rich in Au and poor in Cu, but that in Datuanshan is rich in Cu and Au. The wallrock strata in Tianmashan contain Au-bearing pyrite layers with some organic substance but those in Datuanshan contain no such layers. Moreover, the ore-forming fluids in Tianmashan are dominantly magmatic ones at the oxide and sulfide stages, but those with high content of Cu in Datuanshan are mainly groundwater fluids. In addition, differences in compositional evolution and physicochemical condition variation of the ore-forming fluids result in gradual dispersion
基金supported by the National Natural Science Foundation of China(21666033)the State Key Research and Development Project of China(2016YFB0301603)+1 种基金the International Corporation of S&T Project in Xinjiang Bingtuan(2018BC003)the International Corporation of S&T Project in Shihezi University(GJHZ201701)。
文摘The continuous expansion of vinyl chloride production increases environmental pollution caused by mercury catalysts,which is an issue that urgently needs to be solved.Green and stable catalysts should be researched to alleviate this issue.In this research,Thiolactic acid acts as a ligand where sulfhydryl groups form a stable complex with Au on the surface of a spherical activated carbon(SAC).An Au-thiolactic acid/SAC catalyst was designed with a Au theoretical loading of 0.5%(mass)to overcome the disadvantages of traditional Au-based catalysts,such as a low conversion rate and poor life cycle.The ratio of Au to ligand was screened,and the activity was best when Au/S=1:8.The formation of the Au-S bond was proven by FT-IR and UV-vis.The longevity test of the Au1 S8/SAC catalyst was carried out at 1200 h^(-1) for 50 h.Samples with reaction times of 0 h,5 h,10 h,20 h,and 50 h were taken to monitor the catalyst status.The XPS and TPR tests proved that the Au-S bond broke as the acetylene hydrochlorination reaction proceeded,The DFT calculation proved that the Au-S bond is the active site,and the sulfur atom promotes the adsorption of C_(2)H_(2) by the catalyst.
文摘金铜合金作为金基合金钎焊料在电子工业电真空器件的焊接中发挥关键作用。本文采用真空感应熔炼方法制备金铜合金铸锭,通过冷轧使铸锭发生塑性变形,并结合后续的不同热处理工艺,研究了大变形量（－90%）的金铜合金在不同热处理条件下的固态相转变过程;采用光学显微镜（OM）、扫描电镜（SEM）对微观组织进行观察,发现冷变形金铜合金在673－723 K温度范围发生回复,在748－923 K发生再结晶,在923 K以上出现再结晶晶粒长大现象;随后,采用差示扫描量热法（DSC）研究了再结晶组织在连续升温-降温过程中的相转变,即升温过程中发生无序相→Au Cu I→Au Cu II→无序相的转变;而降温过程仅发生了无序相→Au Cu I相的直接转变。利用X射线衍射仪（XRD）发现再结晶组织为金的固熔体结构,而在无序-有序相Au Cu I的转变温度区间,其快淬组织为四方结构的Au Cu I结构;随后,采用高分辨透射电镜（HRTEM）观察证实了此结构,且认为该合金在临界温度以下确实存在有序相的转变。
