Method for enriching and recovering precious metal in lead anode slime
A technology of lead anode slime and precious metals, which is applied in the fields of process efficiency improvement, photographic technology, instruments, etc., and can solve the problems of large loss of precious metals, low direct recovery rate, and reduction of direct recovery rate of gold and silver, etc.
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Embodiment 1
[0061] The precious metals in the lead anode slime produced by the lead electrolytic cell of a lead smelter were enriched. Before the enrichment, the lead anode slime was put into a drying oven and dried at 140°C for 6 hours.
[0062] The composition of the obtained dry lead anode slime is shown in Table 1.
[0063] Table 1 Composition of dry lead anode slime
[0064]
[0065] It can be seen from Table 1 that the main metals of the lead anode slime are: Sb, Bi, Pb, Ag, and a small amount of As, Te, Cu, Au.
[0066] Take 1 kg of dried lead anode slime, put the graphite crucible filled with lead anode slime into a vacuum resistance furnace, and carry out vacuum distillation at 1173K and system residual pressure of 10Pa. The time of vacuum distillation is 2.5h. After the vacuum distillation is finished, the first volatile matter and the obtained oxygen-containing high-silver alloy are collected, weighed, and then chemically analyzed.
[0067] The composition of the obtained ...
Embodiment 2
[0081] The temperature of the vacuum distillation was changed between 1073-1273K, and the other operations were the same as in Example 1. The volatility rate of the obtained first volatile matter is shown in Table 6.
[0082] The volatilization rate of the first volatile matter under table 6 different distillation temperatures
[0083]
[0084]
[0085] The direct yields of Ag obtained at different distillation temperatures are shown in Table 7.
[0086] The direct yield of Ag under the different distillation temperatures of table 7
[0087]
[0088] The direct yields of Au obtained at different distillation temperatures are shown in Table 8.
[0089] The direct yield of Au obtained under the different distillation temperatures of table 8
[0090]
[0091] It can be seen from Tables 6-8 that vacuum distillation is performed between 1073-1273K, and the obtained first volatile matter has a good volatility rate, and the obtained Ag and Au have good direct yields.
Embodiment 3
[0093] Control vacuum distillation temperature to be 1173K, system residual pressure to be 10Pa, change the time of vacuum distillation to be 2h, 3h, 3.5h, 4h, all the other operations are the same as embodiment 1. The volatilization rates of the volatiles obtained under different vacuum distillations are shown in Table 9.
[0094] The volatilization rate of volatile matter under the different distillation time of table 9
[0095]
[0096]
[0097] The direct yields of Ag obtained under different distillation times are shown in Table 10.
[0098] The direct yield of Ag obtained under the different distillation times of table 10
[0099]
[0100] The direct yields of Au obtained under different distillation times are shown in Table 11.
[0101] The direct yield of Au obtained under the different distillation times of table 11
[0102]
[0103] It can be seen from Tables 9 to 11 that the volatilization rate of volatile matter is about 40% when the distillation tim...
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