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Method for electrolytically refining crude lead

A technology of electrolytic refining and rough lead, which is applied in the fields of process efficiency improvement, photographic technology, instruments, etc., can solve environmental and human hazards and other problems, and achieve the effects of improving direct recovery rate, overcoming environmental pollution, and improving electrolysis efficiency

Inactive Publication Date: 2014-06-18
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a method for electrolytically refining crude lead in order to solve the problem of great harm to the environment and human body in the prior art during the electrolytic refining of crude lead. The method carries out electrolysis of crude lead in an alkaline solution containing tartaric acid Refining, which can reduce environmental pollution and harm to human body during the electrolysis process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The lead content in crude lead is 98.30%, and the main impurities are 0.0008% tin, 0.8281% antimony, 0.1363% bismuth, 0.5127% arsenic, 0.0795% copper, 0.0006% zinc, 0.1406% ​​silver, and 0.0013% iron. Tartaric acid, sodium hydroxide and lead oxide were all analytically pure.

[0021] Weigh 500 g of crude lead, heat and melt in a muffle furnace at 600 °C for 15 min, take it out, and cast it into an anode plate in a graphite mold with a size of 10 cm × 10 cm.

[0022] Weigh 200 g of lead oxide, 180 g of sodium hydroxide, and 180 g of tartaric acid into 1.5 L of water, stir magnetically at 70°C for 4 h, and filter to obtain an electrolyte solution in which the concentration of lead ions is 110 g / L. Control the electrolysis temperature at 55°C and the current density at 140 A / m 2 , pole distance 4 cm, plate area 9.7 cm×9.9 cm, electrolyte circulation rate 30 mL / min, when the cell voltage rises to 1.0V, take out the anode plate, wash the anode slime and put it into the elec...

Embodiment 2

[0029] The lead content in crude lead is 98.10%, and the main impurities are 0.0008% tin, 0.9106% antimony, 0.1959% bismuth, 0.5451% arsenic, 0.0933% copper, 0.0006% zinc, 0.1521% silver, and 0.0015% iron. Tartaric acid, sodium hydroxide and lead oxide were all analytically pure.

[0030] Weigh 500g of crude lead, heat it in a muffle furnace to 650°C and melt it for 15 minutes, take it out, and cast it into an anode plate in a graphite mold with a size of 10cm×10cm.

[0031] Add 180 g of lead oxide, 210 g of sodium hydroxide, and 210 g of tartaric acid into 1.5 L of distilled water, stir magnetically at 80°C for 4 h, and filter to obtain an electrolyte solution in which the concentration of lead ions is 100 g / L. The electrolysis temperature was controlled at 45°C, the current density was 160 A / m2, the pole distance was 4 cm, the plate area was 9.7 cm×9.9 cm, the electrolyte volume was 1.5 L, and the electrolyte circulation rate was 30 mL / min. When the tank voltage rises to 1....

Embodiment 3

[0038] The lead content in crude lead is 98.30%, and the main impurities are 0.0008% tin, 0.8281% antimony, 0.1363% bismuth, 0.5127% arsenic, 0.0795% copper, 0.0006% zinc, 0.1406% ​​silver, and 0.0013% iron. Tartaric acid, sodium hydroxide and lead oxide were all analytically pure.

[0039] Weigh 500 g of crude lead, heat and melt in a muffle furnace at 600 °C for 15 min, take it out, and cast it into an anode plate in a graphite mold with a size of 10 cm × 10 cm.

[0040] Weigh 100 g of lead oxide, 120 g of sodium hydroxide, and 150 g of tartaric acid into 1.5 L of water, stir magnetically at 70°C for 4 h, and filter to obtain an electrolyte solution in which the concentration of lead ions is 80 g / L. Control electrolysis temperature 40℃, current density 100 A / m 2, pole distance 4 cm, plate area 9.7 cm×9.9 cm, electrolyte circulation rate 8.5 mL / min, when the cell voltage rises to 1.0V, take out the anode plate, wash the anode slime and put it into the electrolyzer to continu...

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Abstract

The invention discloses a method for electrolytically refining crude lead. The method comprises the following steps of: adding sodium hydroxide and tartaric acid into water in turn, and stirring to dissolve at normal temperature to obtain a mixed solution; adding lead oxide powder into the mixed solution, dissolving and filtering to obtain filtrate, namely electrolyte; and adding the prepared electrolyte into an electrolytic cell, and switching on direct current for electrolysis by taking a stainless steel plate or a pure lead plate as a cathode and crude lead to be refined as an anode. By the method, smoke and middle slag generated in pyro-refining are avoided, the direct recovery rate of lead and comprehensive recovery rate of valued metals in the refining process are improved, volatile smoke or acid mist cannot be generated, and a defect that electrolyte in a silicofluoric acid system pollutes environment is overcome; meanwhile, the sodium hydroxide and the tartaric acid are added into the electrolyte, so that the sodium hydroxide and the tartaric acid can form a complex with the lead oxide, the concentration of lead ions in the electrolyte is greatly increased and the electrolysis efficiency is improved.

Description

technical field [0001] The invention relates to the field of lead purification and refining, in particular to a method for electrolytically refining crude lead. Background technique [0002] In order to remove harmful impurities in crude lead and recover precious metals, it must be refined. There are two methods of refining crude lead: fire method and electrolysis method. The main steps of the pyro-refining process are: ① Copper removal: first smelt or condensate to remove copper, then add sulfur to remove copper in depth; ② add caustic soda to remove tellurium; ③ use oxidation or alkaline refining to remove arsenic, antimony, tin; ④ adding zinc to recover gold and silver; ⑤ removing zinc; ⑥ adding calcium and magnesium to remove bismuth; ⑦ finally refining ingots to obtain refined lead. The slag produced in each process is processed separately to recover valuable elements. Pyrorefining crude lead produces a considerable amount of lead (and other metals) smoke, various int...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C1/18
CPCY02P10/20
Inventor 刘伟杨天足周琼华张杜超刘伟锋
Owner HENAN UNIV OF SCI & TECH
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