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Method for recycling valuable metals from lead anode slime

A valuable metal and lead anode slime technology is applied in the field of hydrometallurgy, which can solve the problems of difficult leaching of antimony and low yield of valuable metals, and achieve the effects of high recovery rate, reduced reagent consumption and simple process route.

Active Publication Date: 2013-02-13
HUNAN RARE EARTH METAL MATERIAL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for recovering valuable metals from lead anode slime, so as to solve the technical problems of difficult leaching of antimony and low yields of valuable metals such as copper, bismuth, antimony and tellurium in the prior art

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  • Method for recycling valuable metals from lead anode slime

Examples

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Embodiment 1

[0050] 1) Chlorinated acid leaching: Dry the anode slime at 80°C for 2 days and then grind it into a fine powder. The fine powder is oxidized naturally in the air for 9 days to obtain oxidized anode slime. Soak 78wt% oxidized anode slime, 17wt% sodium chloride, and 5wt% sodium chlorate in a strong acid solution with a solid-to-liquid volume ratio of 1:5 and a concentration of 6mol / L, stir at 80°C for 4 hours, and filter to obtain Pickling solution and pickling residue.

[0051] 2) Hydrolysis of Tellurium Precipitation: Cooling and crystallizing the acid leaching solution and filtering to obtain the first filter residue and the first filtrate; recover antimony from the first filter residue; add an equal amount of water to the first filtrate to dilute, and adjust the pH value with alkaline solution 2. Obtaining the hydrolyzate, carrying out the heat preservation and filtering step of the hydrolyzate to obtain the second filter residue and the second filtrate; and recovering the ...

Embodiment 2

[0056] 1) Chlorinated acid leaching: Dry the anode slime at 80°C for 2 days and then grind it into a fine powder, then place the fine powder in the air for natural oxidation for 3-9 days to obtain oxidized anode slime. Take 65wt% oxidized anode slime, 15wt% sodium chloride, and 20wt% sodium chlorate and soak them in a strong acid solution with a solid-to-liquid volume ratio of 1:10 and a concentration of 3mol / L, stir at 80°C for 4 hours, and filter to obtain Pickling solution and pickling residue.

[0057] 2) Hydrolysis of Tellurium Precipitation: Cooling and crystallizing the acid leaching solution and filtering to obtain the first filter residue and the first filtrate; recover antimony from the first filter residue; add an equal amount of water to the first filtrate to dilute, and adjust the pH value with alkaline solution 1. Obtaining a hydrolyzate, carrying out heat preservation and filtration on the hydrolyzate to obtain a second filter residue and a second filtrate; and ...

Embodiment 3

[0062] 1) Chlorinated acid leaching: Dry the anode slime at 80°C for 2 days and then grind it into a fine powder, then place the fine powder in the air for natural oxidation for 3-9 days to obtain oxidized anode slime. Soak 72wt% oxidized anode slime, 20wt% sodium chloride, and 8wt% sodium chlorate in a strong acid solution with a solid-to-liquid ratio of 1:3 and a concentration of 10mol / L, stir at 80°C for 4 hours, and filter to obtain acid Leach liquor and pickling residue.

[0063] 2) Hydrolysis of Tellurium Precipitation: Cooling and crystallizing the acid leaching solution and filtering to obtain the first filter residue and the first filtrate; recover antimony from the first filter residue; add an equal amount of water to the first filtrate to dilute, and adjust the pH value with alkaline solution 0 to obtain a hydrolyzed solution, the hydrolyzed solution is subjected to an insulated filtration step to obtain a second filter residue and a second filtrate; the second filt...

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Abstract

The invention provides a method for recycling valuable metals from lead anode slime, which comprises the following steps: preprocessing anode slime to obtain oxide anode slime, and performing chloration and leaching on 65-78 wt% of oxide anode slime, 15-20 wt% of sodium chloride and 5-20 wt% of sodium chlorate to obtain an acid leaching liquor and acid leaching residue; performing cooling crystallization on the acid leaching liquor and filtering to obtain first filter residue and a first filter liquor; hydrolyzing, insulating and filtering the first filter liquor to obtain second filter residue and a second filter liquor; recycling antimony from the second filter residue; adding iron powder into the second filter liquor and reducing and filtering to obtain a third filter liquor and third filter residue; recycling bismuth, copper and arsenic from the third residue; taking 70-95 wt% of the acid leaching residue and 5-30 wt% of a reducing agent and performing alkaline leaching to obtain alkaline leaching liquor and alkaline leaching residue; recycling tellurium from the alkaline leaching liquor; and performing pyrogenic process smelting on the alkaline leaching residue to recycle gold and silver. The method solves the technical problems that in the prior art, antimony is difficult to leach, and the recovery rate of valuable metals such as copper, bismuth, antimony, tellurium and the like is low.

Description

technical field [0001] The invention relates to the field of hydrometallurgy, in particular to a method for recovering valuable metals through wet treatment of lead anode slime. Background technique [0002] Lead anode slime is the sediment produced at the bottom of the electrolytic tank during lead electrolytic refining. Generally, lead ore contains more silver and various valuable metals. The valuable metals in the lead concentrate enter the corresponding finished or semi-finished products along with the main metal during the pyro-smelting process, and are separated from the main metal into the anode slime during the final electrolytic refining. Therefore, the lead anode slime is a comprehensive Important raw materials for recovering antimony, bismuth, copper, lead, arsenic, tellurium and other metals. Due to the complex composition of lead anode slime and its different properties due to different sources, it is a difficult material to handle. Metallurgists from all over ...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B3/04C22B3/44C22B11/00C22B15/00C22B30/00C01B19/02
CPCY02P10/20
Inventor 刘吉波吴文花王志坚苏正夫刘素梅毛鹏
Owner HUNAN RARE EARTH METAL MATERIAL RES INST
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