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Method for electrolyzing metals through wet method

A technology for electrolysis of metals and wet processes, which is applied in the improvement of process efficiency, photographic technology, instruments, etc., can solve the problems of electrolysis voltage drop, electrolyte purification and impurity removal, and energy consumption reduction, so as to improve the leaching rate and improve the utilization rate. Effect

Inactive Publication Date: 2016-01-27
北京中金瑞丰环保科技有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0016] Therefore, the present invention adopts weak alkaline complexing solution to leach and electrolyze the raw materials, which solves the problem that the metal leaching rate in current hydrometallurgy is low, it is difficult to dissolve metal silicates, and the lead paste pre-desulfurization process uses expensive sodium carbonate Or the high desulfurization cost problem that sodium hydroxide brings; The present invention adopts the compound of calcium or barium to remove sulfate or silicate in the electrolytic solution, has solved the purification and impurity removal problem of the electrolytic solution; In addition, the present invention will weakly alkaline The pH value of the complex solution is controlled at 7.5-13.5, which greatly reduces the electrolysis voltage and effectively reduces energy consumption

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0086] 1) Configure 10L of weakly alkaline complexing solution containing 1mol / L ethylenediamine, 0.7mol / L phenylalanine, 0.1mol / L zinc oxide, 1g / L gelatin, 2.5mol / L sodium sulfate, and adjust with sulfuric acid The pH of the solution is between 9.5-10.0, 1.2 kg of zinc sulfide calcine containing 4% lead, 3% copper, and 60% zinc is added, and reacted at 70°C for 0.5 hours.

[0087] 2) The solution obtained in step 1) is filtered, and excess zinc powder is added to the filtrate to remove lead and copper ions contained in the solution.

[0088] 3) Filter the solution obtained in step 2), and pass oxygen into the filtrate to convert the ferrous ions in the solution into iron hydroxide precipitates.

[0089] 4) Filter the solution obtained in step 3) and inject it into the electrolytic cell. The anode uses graphite electrode with an area of ​​500cm 2 , The cathode adopts pure aluminum inert electrode, with an area of ​​500cm 2 , Constant current electrolysis at a constant temperature of ...

Embodiment 2

[0092] 1) Take 10kg of lead paste from used lead-acid batteries and thermally decompose it at 550°C for 30 minutes to decompose all lead dioxide into lead oxide.

[0093] 2) Configure 25L weakly alkaline complexing solution containing 0.5mol / L phenylalanine, 0.4mol / L arginine, 0.1mol / L lead oxide, 0.1g / L rosin, 0.5mol / L potassium sulfate, using Adjust the pH value of the reaction solution with potassium hydroxide aqueous solution to be between 8.2 and 8.5, add 3.5 kg of the heat-treated lead paste in step 1), and react at 60° C. for 1.5 hours.

[0094] 2) The solution obtained in step 1) is filtered, and excess metallic lead is added to it to remove trace copper contained therein.

[0095] 3) Filter the solution obtained in step 2) and inject it into the electrolytic cell. The anode uses 5 titanium electrodes with an area of ​​500 cm 2 , The cathode adopts 6 pieces of pure lead chip electrodes with an area of ​​500cm 2 , Constant temperature 75℃, current density 450A / m 2 Under consta...

Embodiment 3

[0100] 1) Take 1 kg of copper ore containing 50% of basic copper carbonate and thermally decompose it at 400° C. for 1 hour to decompose basic copper carbonate into carbon dioxide and copper oxide.

[0101] 2) Configure 5L weakly alkaline complexing solution containing 1.3mol / L histidine, 0.5mol / L copper oxide, 0.1g / L polyethylene glycol, 1.8mol / L sodium chloride, and adjust with potassium hydroxide aqueous solution The pH value of the reaction solution is between 10.5-11.0, 300 g of the copper oxide ore obtained in step 1) is added, and the reaction is carried out at 90° C. for 0.5 hours.

[0102] 3) The solution obtained in step 2) is filtered, and excess metallic copper is added to it to remove trace amounts of silver contained therein.

[0103] 4) Filter the solution of step 3) and add calcium hydroxide to it to convert a small amount of silicate, sulfate and undecomposed carbonate dissolved in the ore into calcium sulfate, calcium silicate, and calcium carbonate precipitation.

...

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Abstract

The invention provides a process for electrolyzing and refining lead, zinc and copper through a wet method. The process includes the specific steps that an alkalescent complexing solution with high complexing capacity is selected as a leaching solution and all valuable metals are leached out; impurities of the leaching solution are removed through a metal replacement mode; deposited lead or deposited zinc or deposited copper and oxygen are obtained through an electrolytic method; then the solution is subjected to desulfuration and desilicication through calcium oxide or calcium hydroxide; and finally, the lead or the zinc or the copper is obtained after being refined. The alkalescent complexing solution is adopted for leaching and electrolyzing, so that the problems that the leaching rate is low and metal silicates and ferrates are hard to dissolve in terms of current metal smelting with the wet method are solved. Compounds of calcium or barium are adopted for desulfuration of metal sulfates, so that the problem of high desulfuration cost caused by current desulfuration through sodium carbonate or sodium hydroxide is solved. The potential of hydrogen (pH) value of the alkalescent complexing solution is controlled to be 7.5-13.5, the electrolytic voltage is substantially lowered, and the energy consumption is effectively reduced.

Description

Technical field [0001] The invention relates to the field of metal electrolysis, in particular to a method for wet electrolysis of metal. Background technique [0002] In 2013, China produced 4.47 million tons of lead, 5.3 million tons of zinc, and 6.83 million tons of copper, ranking 2-4 in the world's non-ferrous metal output. Copper, lead, and zinc are associated metals. Lead, copper, and zinc ores generally contain copper, lead, and zinc, but the content is different. Copper, lead, and zinc ores mainly contain copper, lead, and zinc, with associated cadmium and silver. , Indium, cobalt, gallium, germanium, tin, antimony, bismuth, arsenic, silicon, aluminum, calcium and other elements. Waste lead-acid batteries also contain a small amount of impurity metals, including copper, silver, cadmium, tin, antimony, bismuth, arsenic, etc., and their elemental composition is similar to that of ore. Lead, zinc, and copper are important industrial metals, which are widely used in life, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C1/12C25C1/18C25C1/16
CPCY02P10/20
Inventor 张超
Owner 北京中金瑞丰环保科技有限公司
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