Desulfurization process for waste material containing lead sulfate and circulation method of desulfurization mother liquor thereof

A desulfurization process, technology containing sulfuric acid, applied in the direction of improving process efficiency, etc., can solve the problems of aggravating lead and sulfur dioxide pollution, and achieve the effect of reducing lead pollution and mild process conditions

Active Publication Date: 2017-07-04
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high price of NaOH and sodium carbonate, the desulfurization agent required per ton of lead paste is as high as 240-400 yuan, which makes some

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Commercially available Fengfan valve-regulated sealed lead-acid batteries with specifications of 12V and 55Ah were crushed and separated to obtain lead paste and waste sulfuric acid solution. According to the traditional chemical titration analysis of the lead paste, the lead-containing components and contents thereof are respectively 9.8% of Pb, 15.6% of PbO, 15.6% of PbO 2 content of 33.7% and PbSO 4 The content is 39.8%. Then the lead paste is subjected to desulfurization reaction, and the treatment process is as follows:

[0034] (1) Weigh 1.0kg of lead paste and add it to a 10L leaching reactor, and add 5L of NH with a concentration of 10mol / L to the reactor 3 ·H 2 O and 2mol / L (NH 4 ) 2 SO 4 The solution was stirred and reacted at a constant temperature of 30° C. for 25 minutes, and the stirring rate was 150 rpm. Carry out solid-liquid separation to obtain the filtrate and unreacted filter residue of the complex of dissolved lead sulfate;

[0035] (2) tran...

Embodiment 2

[0040] Take 1 kg of lead-containing flue ash from Anyang Minshan Smelter, and analyze it by chemical titration to obtain its PbSO 4 The content is 63.5%, and the balance is iron oxide, silicon dioxide and clay. Then the flue ash will be subjected to desulfurization reaction, the treatment process is as follows:

[0041] (1) Add 1.0kg of flue ash to a 10L leaching reactor, and add 5L of NH with a concentration of 12mol / L to the reactor 3 ·H 2 O and 1mol / L (NH 4 ) 2 SO 4 solution, and added 0.1 kg of glycine as a leaching accelerator, stirred and reacted at a constant temperature of 40° C. for 15 minutes, and the stirring rate was 100 rpm. Carry out solid-liquid separation to obtain the filtrate and unreacted filter residue of the complex of dissolved lead sulfate;

[0042] (2) transfer the lead sulfate complex solution obtained above to the closed carbonization reactor, and feed CO 2 , the control pressure is 0.02MPa, the flow rate is 4L / min, the reaction temperature is ...

Embodiment 3

[0047] Get the same 1 kg of lead-containing flue ash from Minshan Smelter in Anyang as in Example 2 and the desulfurization circulating liquid recovered in Example 2 step (3). Its processing is as follows:

[0048] (1) Add the above-mentioned 1.0kg of flue ash into a 10L leaching reactor, add the desulfurization circulating liquid recovered in step (3) into the reactor, stir and react at a constant temperature of 40°C for 15min, and the stirring rate is 100rpm. Carry out solid-liquid separation to obtain the filtrate and unreacted filter residue of the complex of dissolved lead sulfate;

[0049] (2) transfer the lead sulfate complex solution obtained above to the closed carbonization reactor, and feed CO 2 , the control pressure is 0.015MPa, the flow rate is 4L / min, the reaction temperature is 50°C and the stirring rate is 200rpm, so that the dissolved lead sulfate is transformed into lead carbonate precipitate. Stir continuously for 20 min until no more precipitation occurs...

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Abstract

The invention relates to a desulfurization process for a waste material containing lead sulfate and a circulation method of desulfurization mother liquor thereof, belonging to the technical field of comprehensive utilization of solid waste materials containing lead. The desulfurization process comprises the steps: dissolving the waste material containing the lead sulfate with a compound leaching agent, thus dissolving lead sulfate solid, and obtaining filter liquor dissolved with the lead sulfate and unreacted filter residues after solid-liquid separation, wherein the compound leaching agent comprises an A and B conjugate solution, A is one or more of ammonia and amine substances, and b is ammonium salt; adding a carburizing agent providing carbonate into the lead sulfate filter liquor, and obtaining lead carbonate precipitation and deleading mother liquor after solid-liquid separation; adding a desulfurizing agent into the deleading mother liquor, and obtaining sulfate and the desulfurization mother liquor after solid-liquid separation. The desulfurization process industriously achieves the requirement of atom economy reaction.

Description

technical field [0001] The invention relates to a desulfurization method for recycling waste lead-acid batteries, and belongs to the technical field of comprehensive utilization of lead-containing solid waste. Background technique [0002] Since the lead-acid battery was invented by Plant in 1859, it has become one of the main types of secondary batteries due to its high reliability, wide operating temperature, and major advantages in high current density and starting performance. Lead-acid batteries are widely used in starting batteries for internal combustion engine vehicles, power supplies for electric vehicles, and in other fields such as energy storage and backup power. According to statistics, the total output value of global lead-acid batteries in 2015 was 43.21 billion US dollars, accounting for 54.6% of the global output value of secondary batteries. Due to the rise of the automobile industry in emerging countries and the improvement of environmental protection req...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B13/00
CPCC22B7/006C22B7/008C22B13/045Y02P10/20
Inventor 潘军青王平渊孙艳芝
Owner BEIJING UNIV OF CHEM TECH
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