A method for recovering lead from lead-containing waste

Abstract

The invention discloses a method for recovering lead from lead-containing waste, comprising the following steps: 1) reacting the lead-containing waste with a complexing agent aqueous solution, so that the lead oxide and / or lead sulfate in the lead-containing waste are completely dissolved, and the reaction After finishing, separate the supernatant containing lead ion and do not contain lead salt precipitate; 2) react the supernatant with precipitant, make the lead ion in the supernatant completely precipitate, and separate the lead salt precipitate and after the reaction finishes. Regenerating the complexing agent aqueous solution; 3) dissolving the lead-containing salt precipitation with the electrolyte A aqueous solution, so that the lead-containing salt precipitation is completely dissolved, and after the reaction finishes, the lead-containing electrolyte B and the precipitation agent are produced; Reclaim the precipitation agent; and Lead-containing electrolyte B is subjected to electrolytic reaction to obtain metal lead, oxygen and regenerated electrolyte A. The complexing agent, the precipitating agent and the electrolyte A used in the recovery process of the method of the present invention can be recycled and used repeatedly, which conforms to the characteristics of atomic economic reaction, thereby realizing zero consumption and zero discharge, and saving production costs.

Description

technical field [0001] The invention relates to a method for recycling waste. More particularly, it relates to a method of recovering lead from lead-containing waste. Background technique [0002] Since the invention of lead-acid batteries by French engineer Plante in 1859, lead-acid batteries have dominated the secondary battery market, especially the car starter and electric bicycle markets for a long time due to their low price, wide operating temperature range and outstanding stability. Location. According to battery statistics, the total consumption of refined lead in China in 2012 exceeded 4.646 million tons, of which the consumption of lead-acid batteries was 3.3 million tons, accounting for about 71% of the total lead consumption. Due to the rapid development of my country's automobile consumption, it can be predicted that for a long period of time in the future, it will still face the problems of continuous growth of lead consumption and increasingly scarce lead r...

AI Technical Summary

Problems solved by technology

[0006] (2) The silicon dioxide contained in the lead-containing flue ash will also have a side reaction with fluosilicic acid, thereby intensifying the consumption of fluosilicic acid;

[0007] (3) Sulfuric acid and sodium carbonate used in the reaction process cannot be recycled. For every 1 mol of lead oxide produced, theoretically at least 1 mol of sulfuric acid and 1 mol of sodium carbonate should be consumed, while 1 mol of sodium sulfate and 1 mol of carbon dioxide should be discharged.

[0009] In addition, the Yang Jiakuan research group of Huazhong University of Science and Technology recently tried to recycle lead-containing waste with citric acid and hydrogen peroxide. The main problem of this method is the high cost and pollution caused by the high-temperature roasting consumption of citric acid during the recycling process.

Pan Junqing's research group at Beijing University of Chemical Technology tried to use sodium hydroxide solution to realize the dissolution and recrystallization process of lead oxide-containing waste. Experimental studies have shown that this method is very superior to lead oxide-containing waste directly converted from a single type of lead-acid battery. Recycling, but for the complex composition of waste lead-acid battery lead paste and flue ash mixed with multiple varieties, especially lead oxide waste containing 10-30% silicon-aluminum composite oxide, alumina and silica , tin dioxide, etc. have significant dissolution and consumption in alkaline sodium hydroxide solution