A complex lead-zinc-silver sulfide ore containing 2.98% Pb, 6.49% Zn and 116.32×10-4% Ag (mass fraction) from Yunnan Province, China, was subjected to this work. Research on mineral processing was conducted accor...A complex lead-zinc-silver sulfide ore containing 2.98% Pb, 6.49% Zn and 116.32×10-4% Ag (mass fraction) from Yunnan Province, China, was subjected to this work. Research on mineral processing was conducted according to the properties of the lead-zinc-silver ore. Under low alkalinity condition, the lead minerals are successfully separated from the zinc minerals with new reagent YZN as zinc depressant, new reagent BPB as lead collector, CuSO4 as zinc activator and ethyl xanthate as zinc collector. The associated silver is mostly concentrated to the lead concentrate. With the process utilized in this work, a lead concentrate of 51.90% Pb with a recovery of 82.34% and a zinc concentrate of 56.96% Zn with a recovery of 81.98% are produced. The silver recovery in the lead concentrate is 80.61%. Interactions of flotation reagents with minerals were investigated, of which the results indicate that the presence of proper amount of Na2S can precipitate Pb2+ and has a sulfidation on oxidized lead minerals. The results also show that Na2CO3 and YZN used together as combined depressants for sphalerite can signally improve the depressing effect of new reagent YZN on sphalerite.展开更多
On the basis of an experimental study and thermodynamic calculation, the mechanisms of paragenesis and separation of silver, lead and zinc in the hydrothermal system have been studied. At acidic to nearly neutral pH, ...On the basis of an experimental study and thermodynamic calculation, the mechanisms of paragenesis and separation of silver, lead and zinc in the hydrothermal system have been studied. At acidic to nearly neutral pH, their chloride complexes are stable, and among them the chloride complexes of zinc are most stable. And the sulfide complexes are the dominant species at nearly neutral to alkaline pH, while the sulfide complexes of silver are most stable. With decreasing temperature, , f-{O-2} and increasing pH, the solubilities of silver, lead and zinc will decrease, leading to their deposition and separation. For sulfide complexes, the concentrations of reduced sulfur and pH are two important factors affecting their stabilities. Complexes of different forms and stabilities respond to the variation of conditions to different extents, which gave rise to the paragenesis and separation of silver, lead and zinc in the whole ore-forming process of dissolution, transport and deposition.展开更多
这是一篇矿物加工工程领域的文章。河北某铅锌矿中主要有价元素为铅、锌,品位分别为1.07%、2.08%。矿石中的铅主要赋存于方铅矿中,另有白铅矿、硫酸铅、铅铁矾等含铅矿物,锌主要赋存于硫化物闪锌矿中,占总锌的66.96%,其次为氧化锌矿物,...这是一篇矿物加工工程领域的文章。河北某铅锌矿中主要有价元素为铅、锌,品位分别为1.07%、2.08%。矿石中的铅主要赋存于方铅矿中,另有白铅矿、硫酸铅、铅铁矾等含铅矿物,锌主要赋存于硫化物闪锌矿中,占总锌的66.96%,其次为氧化锌矿物,锌氧化率较高。在实验研究中,确定了在-0.074 mm 65%的磨矿细度条件下,优先浮铅再浮锌的工艺。浮选产品中,铅精矿产率1.74%,铅精矿中铅、锌、铜品位分别为51.73%、10.86%、3.81%,回收率分别为83.93%、8.98%、68.20%;锌精矿产率为2.26%,锌精矿中铅、锌、铜品位分别为1.25%、51.64%、0.73%,回收率分别为2.63%、55.42%、16.97%。展开更多
基金Project(50874117) supported by the National Natural Science Foundation of China
文摘A complex lead-zinc-silver sulfide ore containing 2.98% Pb, 6.49% Zn and 116.32×10-4% Ag (mass fraction) from Yunnan Province, China, was subjected to this work. Research on mineral processing was conducted according to the properties of the lead-zinc-silver ore. Under low alkalinity condition, the lead minerals are successfully separated from the zinc minerals with new reagent YZN as zinc depressant, new reagent BPB as lead collector, CuSO4 as zinc activator and ethyl xanthate as zinc collector. The associated silver is mostly concentrated to the lead concentrate. With the process utilized in this work, a lead concentrate of 51.90% Pb with a recovery of 82.34% and a zinc concentrate of 56.96% Zn with a recovery of 81.98% are produced. The silver recovery in the lead concentrate is 80.61%. Interactions of flotation reagents with minerals were investigated, of which the results indicate that the presence of proper amount of Na2S can precipitate Pb2+ and has a sulfidation on oxidized lead minerals. The results also show that Na2CO3 and YZN used together as combined depressants for sphalerite can signally improve the depressing effect of new reagent YZN on sphalerite.
文摘On the basis of an experimental study and thermodynamic calculation, the mechanisms of paragenesis and separation of silver, lead and zinc in the hydrothermal system have been studied. At acidic to nearly neutral pH, their chloride complexes are stable, and among them the chloride complexes of zinc are most stable. And the sulfide complexes are the dominant species at nearly neutral to alkaline pH, while the sulfide complexes of silver are most stable. With decreasing temperature, , f-{O-2} and increasing pH, the solubilities of silver, lead and zinc will decrease, leading to their deposition and separation. For sulfide complexes, the concentrations of reduced sulfur and pH are two important factors affecting their stabilities. Complexes of different forms and stabilities respond to the variation of conditions to different extents, which gave rise to the paragenesis and separation of silver, lead and zinc in the whole ore-forming process of dissolution, transport and deposition.
文摘这是一篇矿物加工工程领域的文章。河北某铅锌矿中主要有价元素为铅、锌,品位分别为1.07%、2.08%。矿石中的铅主要赋存于方铅矿中,另有白铅矿、硫酸铅、铅铁矾等含铅矿物,锌主要赋存于硫化物闪锌矿中,占总锌的66.96%,其次为氧化锌矿物,锌氧化率较高。在实验研究中,确定了在-0.074 mm 65%的磨矿细度条件下,优先浮铅再浮锌的工艺。浮选产品中,铅精矿产率1.74%,铅精矿中铅、锌、铜品位分别为51.73%、10.86%、3.81%,回收率分别为83.93%、8.98%、68.20%;锌精矿产率为2.26%,锌精矿中铅、锌、铜品位分别为1.25%、51.64%、0.73%,回收率分别为2.63%、55.42%、16.97%。
