Clean wet-method solid-liquid two-phase electroreduction lead recovery method

A technology for cleaning wet and electrolytic cells, applied in the field of lead hydrometallurgy for regenerated lead from waste lead materials, can solve the problems of small cathode reduction depth, uneconomical power consumption, low equipment utilization rate, etc., to reduce energy consumption, avoid toxic and harmful Effects of the use of substances

Inactive Publication Date: 2010-09-15
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In 1985, German patent (DE, 3402338A) and British patent (1368423 and 1428957) successively reported the principle of forming the negative plate of lead-acid battery, fixing the lead paste of waste battery on a metal plate or metal basket, and in dilute sulfuric acid solution As the cathode for electrolytic reduction, metallic lead and sulfuric acid are obtained, but due to the limited solubility of lead sulfate in dilute acid, the current density and laminate thickness are small, resulting in low utilization of equipment, resulting in small cathode reduction depth, high tank pressure, and energy efficiency. Consumption is large; and the concentration of recovered sulfuric acid is only about 10%, thus limiting industrial promotion
Chinese patent ZL2008101114308.3 (method for recycling waste lead-acid battery battery lead by acid-type wet electrolysis) uses dual power sources and activators to greatly increase the reduction speed and efficiency of lead sulfate, and realizes lead-acid battery lead paste and grid The direct reduction of the lead-acid battery realizes the power consumption of 600-700KWh per ton of lead, and can recycle up to 30% of sulfuric acid. The disadvantage is that this process requires separate electrolytic treatment of the monomers of the lead-acid battery during the electrolysis process, which is not easy to achieve large-scale Industrial production
The disadvantage of this method is that d

Method used

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Effect test

Embodiment 1

[0032] Take 10 pieces of 12V, 10Ah waste lead-acid batteries for electric vehicles from Tianjin Lantian Hi-Tech Company. The total weight of the battery pack is 42.6 kg. The specific implementation process is as follows:

[0033] 1) After discharging 10 batteries first, put them into a crusher and crush them, and then separate them in the water phase by density difference to obtain lead paste, grids, waste sulfuric acid, separators and shells.

[0034] 2) Put the pressure-filtered lead paste into a ball mill for wet grinding and then screen it with a 60-mesh stainless steel screen. The larger lead paste particles will continue to be transferred to the pulverizer for pulverization until all the lead paste has penetrated Sieve.

[0035] 3) Take 60L of waste sulfuric acid obtained in the process of 1 and adjust its acidity to contain 3mol / L of H 2 SO 4 And 0.1mol / L SnSO 4 Then, the 20 kilograms of lead paste powder obtained by sieving in step 2) and the waste sulfuric acid solution wer...

Embodiment 2

[0041] Take one 12V, 45Ah lead-acid battery from Baoding Fengfan Company, the total weight of the battery pack is 13.5 kg. The specific recovery process is as follows:

[0042] 1) After the battery is first subjected to discharge treatment, and then put into a crusher to be broken, the water phase is separated by density difference to obtain lead paste, grids, waste sulfuric acid, separators and shell.

[0043] 2) Put the pressure-filtered lead paste into a ball mill for wet grinding and then screen it with an 80-mesh stainless steel screen. The larger lead paste particles will continue to be transferred to the pulverizer for pulverization until all the lead paste has penetrated Sieve.

[0044] 3) Take 10L of waste sulfuric acid obtained in process 1 and adjust its acidity to contain 4.2mol / L of H 2 SO 4 And 0.2mol / L SnSO 4 Then, 5.5 kg of lead paste powder and waste sulfuric acid solution obtained by sieving in the second process were mixed uniformly, and kept at a constant tempera...

Embodiment 3

[0050] Take 5 kilograms of lead-containing waste from the lead-acid battery production workshop of Jiangsu Sanhuan Company, pulverize it into powder by a ball mill, and conduct the following lead recovery in sequence:

[0051] 1) After ball milling the lead-containing waste powder, it is sieved with a 60-mesh screen to obtain fine powder, and then 90 L of 27% NaOH solution is added, and the extraction reaction is performed at 90°C. In order to appropriately increase the solubility of lead, the 27% NaOH solution contains 0.2mol / L nitrilotriacetic acid and 0.2mol / L EDTA as co-complexing agents. In this process, the fine powder of lead-containing materials and NaOH undergo a complex dissolution reaction, where Pb(OH) 2 And PbO both form Na with NaOH 2 [Pb(OH) 4 ], after determination, Na 2 [Pb(OH) 4 ] Part of the lead content is 53g / L, and the remaining about 0.3 kg of soil-like sediment, which is mainly composed of silicate-containing soil after analysis.

[0052] 2) When the extract...

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Abstract

The invention relates to a wet-method electroreduction clean lead recovery method with closed circulation. In the method, based on an electrochemical principle, a solid-liquid two-phase one-step reduction reaction is performed by establishing a closed electrolyte circulation and by the lead-containing material activation of an active agent and the catalytic oxygen absorption action of a high-efficiency anode so as to convert waste lead storage batteries or the lead-containing waste material from lead storage battery production plants into metal lead directly. Thus, the method is a novel environmentally-friendly and energy-saving wet-method electroreduction lead recovery method, and is a novel technique that can be used for large-scale industrial production.

Description

Technical field: [0001] The invention relates to a clean wet solid-liquid two-phase electrolytic reduction and recovery method for lead, which belongs to the field of waste lead material regeneration lead wet metallurgy. Background technique: [0002] Lead-acid batteries, as an indispensable electrical energy storage device for vehicles such as automobiles, are consumed and scrapped rapidly with the consumption of automobiles and electric vehicles. In 2002, the consumption of lead in lead-acid batteries in my country reached 645,000 tons, an increase of more than 150% over 2000. According to statistics from the China Physical and Chemical Power Industry Association, China's lead consumption will reach more than 2 million tons in 2008, accounting for more than 23% of the world's total lead consumption. Due to the contradiction between the limited existing lead mine resources and the increasing demand, lead prices have risen day by day. How to efficiently recycle lead-acid batter...

Claims

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Application Information

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IPC IPC(8): C25C1/18
CPCY02P10/20
Inventor 潘军青岳希红孙艳芝唐路万平玉伊晓波王子镐
Owner BEIJING UNIV OF CHEM TECH
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