The study indicates that geochemical features of Au, Pd in the ore-bea ring hydrothermal system. Au is active and Pd is distinctly inert. Both tend to solute in alkaline media (P=100×10 5Pa,T=200℃). The conditio...The study indicates that geochemical features of Au, Pd in the ore-bea ring hydrothermal system. Au is active and Pd is distinctly inert. Both tend to solute in alkaline media (P=100×10 5Pa,T=200℃). The condition of P=100×10 5 Pa,T= 100℃ is favourable to the solution and rembilization of Au. The best physical a nd chemical environment of gold mineralization is P=20×10 5～30×10 5Pa,T=250 ℃,pH≈7.56.展开更多
This paper investigates the leaching behavior of heavy metals(V,Pb,Cd,Cr,and As) from stone coal waste rocks with various particle sizes using dynamic leaching experiments.The results show that the dissolved concentra...This paper investigates the leaching behavior of heavy metals(V,Pb,Cd,Cr,and As) from stone coal waste rocks with various particle sizes using dynamic leaching experiments.The results show that the dissolved concentrations of V and As initially increased and then slightly decreased as time progressed and that the dissolved concentrations of Pb,Cd,and Cr were high in the early stage before decreasing.The particle size of the stone coal waste rocks strongly influenced the heavy metal concentration in the leaching solutions.The effects of the particle size of the stone coal waste rocks on the dissolved concentrations of V,Pb,and As decreased in the order fine fraction > medium fraction > coarse fraction,and the effects of particle size on the dissolved concentrations of Cr and Cd decreased in the order medium fraction > coarse fraction > fine fraction and coarse fraction > medium fraction > fine fraction,respectively.The quantities of heavy metals dissolved from the stone coal waste rock with fine particle sizes were observed to decrease in the order V(17104.36 μg/kg) > As(609.41 μg/kg) > Pb(469.24 μg/kg) > Cr(56.35 μg/kg) > Cd(27.52 μg/kg),and the dissolution rates decreased in the order As(2.96%) > Pb(0.93%) > V(0.35%) > Cd(0.25%) > Cr(0.01%).The specific surface area,pore size of the stone coal waste rocks,and chemical forms of heavy metals also influenced the release of heavy metals from the stone coal waste rocks.Kinetic analysis showed that the dissolution of heavy metals fundamentally agreed with the rate equation controlled by the shrinking core model.The results of this study are expected to serve as a reference for the evaluation of heavy metals contamination from stone coal waste rocks.展开更多
As the multibarrier system has been adopted to dispose HLW glass in geological formation in many coun- tries, it was important to study the leaching behavior of vitrification under geological formation. This article d...As the multibarrier system has been adopted to dispose HLW glass in geological formation in many coun- tries, it was important to study the leaching behavior of vitrification under geological formation. This article describes the leaching behavior of simulated high level waste glass (90Nd/10), which can incorporate 16 wt.% simulated HLW in five kinds of geological media, such as granite, cement, bentonite, Fe3O4, etc. The durable experimental results show that the glass had less mass loss in granite and more mass loss in bentonite after a two-year leaching test. The SEM/XEDS analysis shows some element distributions on the leached specimen’s surface, i.e., Na, Si and Mg ele- ments were reduced on the specimen’s surface, whereas Ba, Al, and Fe were enriched on the specimen’s surface.展开更多
为了更高效地从粗制氢氧化镍钴中浸出镍、钴,采用两段浸出工艺,以瑞木粗制氢氧化镍钴为原料浸出镍、钴,考察一段浸出pH、温度、浸出时间,以及二段浸出硫酸加入量和时间对镍、钴、锰浸出效果的影响。研究得出:在一段浸出温度70℃、pH=2.0...为了更高效地从粗制氢氧化镍钴中浸出镍、钴,采用两段浸出工艺,以瑞木粗制氢氧化镍钴为原料浸出镍、钴,考察一段浸出pH、温度、浸出时间,以及二段浸出硫酸加入量和时间对镍、钴、锰浸出效果的影响。研究得出:在一段浸出温度70℃、pH=2.0~2.5、浸出时间1.5 h,二段浸出硫酸加入量为一段硫酸加入量的50%~70%的条件下,镍、钴浸出效果最好,分别可以达到100%和98.99%,锰的浸出率可以抑制在36.82%,此时渣率为5.32%,渣中钴和锰元素含量分别为0.71%和55.55%,两段总的酸耗在760 kg t左右。根据小试条件进行300 kg d连续扩大试验,结果可以达到小试的浸出效果。展开更多
文摘The study indicates that geochemical features of Au, Pd in the ore-bea ring hydrothermal system. Au is active and Pd is distinctly inert. Both tend to solute in alkaline media (P=100×10 5Pa,T=200℃). The condition of P=100×10 5 Pa,T= 100℃ is favourable to the solution and rembilization of Au. The best physical a nd chemical environment of gold mineralization is P=20×10 5～30×10 5Pa,T=250 ℃,pH≈7.56.
基金financially supported by the Major Science and Technology Program for Water Pollution Control and Treatment of China (No.2015ZX07205003)
文摘This paper investigates the leaching behavior of heavy metals(V,Pb,Cd,Cr,and As) from stone coal waste rocks with various particle sizes using dynamic leaching experiments.The results show that the dissolved concentrations of V and As initially increased and then slightly decreased as time progressed and that the dissolved concentrations of Pb,Cd,and Cr were high in the early stage before decreasing.The particle size of the stone coal waste rocks strongly influenced the heavy metal concentration in the leaching solutions.The effects of the particle size of the stone coal waste rocks on the dissolved concentrations of V,Pb,and As decreased in the order fine fraction > medium fraction > coarse fraction,and the effects of particle size on the dissolved concentrations of Cr and Cd decreased in the order medium fraction > coarse fraction > fine fraction and coarse fraction > medium fraction > fine fraction,respectively.The quantities of heavy metals dissolved from the stone coal waste rock with fine particle sizes were observed to decrease in the order V(17104.36 μg/kg) > As(609.41 μg/kg) > Pb(469.24 μg/kg) > Cr(56.35 μg/kg) > Cd(27.52 μg/kg),and the dissolution rates decreased in the order As(2.96%) > Pb(0.93%) > V(0.35%) > Cd(0.25%) > Cr(0.01%).The specific surface area,pore size of the stone coal waste rocks,and chemical forms of heavy metals also influenced the release of heavy metals from the stone coal waste rocks.Kinetic analysis showed that the dissolution of heavy metals fundamentally agreed with the rate equation controlled by the shrinking core model.The results of this study are expected to serve as a reference for the evaluation of heavy metals contamination from stone coal waste rocks.
文摘As the multibarrier system has been adopted to dispose HLW glass in geological formation in many coun- tries, it was important to study the leaching behavior of vitrification under geological formation. This article describes the leaching behavior of simulated high level waste glass (90Nd/10), which can incorporate 16 wt.% simulated HLW in five kinds of geological media, such as granite, cement, bentonite, Fe3O4, etc. The durable experimental results show that the glass had less mass loss in granite and more mass loss in bentonite after a two-year leaching test. The SEM/XEDS analysis shows some element distributions on the leached specimen’s surface, i.e., Na, Si and Mg ele- ments were reduced on the specimen’s surface, whereas Ba, Al, and Fe were enriched on the specimen’s surface.
文摘为了更高效地从粗制氢氧化镍钴中浸出镍、钴,采用两段浸出工艺,以瑞木粗制氢氧化镍钴为原料浸出镍、钴,考察一段浸出pH、温度、浸出时间,以及二段浸出硫酸加入量和时间对镍、钴、锰浸出效果的影响。研究得出:在一段浸出温度70℃、pH=2.0~2.5、浸出时间1.5 h,二段浸出硫酸加入量为一段硫酸加入量的50%~70%的条件下,镍、钴浸出效果最好,分别可以达到100%和98.99%,锰的浸出率可以抑制在36.82%,此时渣率为5.32%,渣中钴和锰元素含量分别为0.71%和55.55%,两段总的酸耗在760 kg t左右。根据小试条件进行300 kg d连续扩大试验,结果可以达到小试的浸出效果。
