Waste lead-acid battery diachylon hydrothermal reduction dual conversion method

A technology of waste lead-acid batteries and waste lead paste, which is applied in the field of hydrometallurgy process, can solve the problems of difficult reagent reaction and unreachable, and achieve the effect of low labor intensity, low production cost and stable technical indicators

Active Publication Date: 2016-09-21
CENT SOUTH UNIV
View PDF6 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This pretreatment method is perfect in theory, but in actual operation, the removal rate of sulfate is only 85-95%. Incomplete desulfurization and low reduction efficiency have seriously affected the application effect of this method. The researchers proposed to use supergravity , ball milling, ultrasonic and other means to strengthen the conversion desulfurization process, but the desired effect is still not achieved. The main reason may be that the non-conductive lead sulfate crystals precipitated on the grid of the waste lead-acid battery during the discharge process are difficult to be separated from the conventional conversion desulfurization process. Reagent reaction

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Waste lead-acid battery diachylon hydrothermal reduction dual conversion method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The main components of waste lead paste in the dismantling products of waste lead-acid batteries are (%): Pb73.80%, S5.25% and Sb0.15%, and sodium carbonate is an analytical reagent. Add 2,000g of waste lead paste and 320g of sodium carbonate to 4,000ml of water at the same time for slurrying, control the temperature at 80°C and stir at a speed of 120r / min for 4 hours. After the reaction is completed, use vacuum filtration to separate the liquid from the solid, and reduce the sulfur content in the conversion slag at normal pressure. to 0.54%, and the desulfurization rate in the normal pressure conversion process is 91.50%. Add 36g of sodium carbonate, 20g of starch and 4000ml of water to the conversion slag at normal pressure to slurry, then add the mixed slurry into a stainless steel high-pressure reaction kettle, control the stirring speed at 120r / min, ventilate into the kettle for 2min at a nitrogen partial pressure of 0.3MPa, and then Heat to raise the temperature t...

Embodiment 2

[0030] The main components of waste lead paste in the dismantling products of waste lead-acid batteries are (%): Pb73.80%, S5.25% and Sb0.15%, and sodium carbonate is an analytical reagent. Add 2000g of waste lead plaster and 230g of sodium hydroxide to 4000ml of water at the same time for slurrying, control the temperature at 80°C and the stirring speed at 120r / min for 4 hours, after the reaction is completed, use vacuum filtration to separate the liquid from the solid, and the sulfur content in the normal pressure conversion slag reduced to 0.42%, and the desulfurization rate in the normal pressure conversion process was 92.50%. Add 38g of sodium hydroxide, 380g of sodium sulfite and 4000ml of water to the normal-pressure conversion slag to make a slurry, then add the mixed slurry into a stainless steel high-pressure reaction kettle, control the stirring speed at 120r / min, and ventilate the kettle for 2min at a nitrogen partial pressure of 0.3MPa. Then heat up to 200°C, cont...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a waste lead-acid battery diachylon hydrothermal reduction dual conversion method. Waste diachylon and alkali solution are firstly converted under normal pressure to remove most sulfate radicals; normal-pressure conversion liquid is fed to recover sodium sulfate; normal-pressure conversion slag and the alkali solution are pulped to feed into a reducing agent to add in a high-pressure reaction kettle for reaction under requested temperature and nitrogen partial pressure, so that residual lead sulfate in the normal-pressure conversion slag is reacted with alkali to deeply remove the sulfate radicals; meanwhile, lead dioxide is reduced as lead monoxide; after the reaction time is reached, the solid-liquid separation is performed; hydrothermal conversion liquid is returned into the normal-pressure conversion process; and lead is further extracted from the hydrothermal conversion slag. The essence of the method is to realize dual purposes of deep conversion desulfurization and reduction conversion of the waste diachylon by using a water heat and reduction combined mode; the desulfurization rate and the lead dioxide reduction rate both reach above 99.0%; and advantageous conditions are created for subsequent lead extraction from conversion slag.

Description

technical field [0001] The invention relates to a hydrometallurgical process in the field of nonferrous metallurgy, in particular to a hydrometallurgical method for dual conversion of waste lead-acid storage battery lead paste by hydrothermal reduction. Background technique [0002] Lead is a silvery-white heavy non-ferrous metal. Based on its special physical and chemical properties, it is mainly used to make alloys. Among them, lead-acid batteries are the main consumption area, accounting for more than 80.0% of the world's total lead consumption. Although the weight-to-energy ratio of lead-acid batteries is lower than that of MH-Ni batteries and Li-ion batteries, they are widely used in various fields of the national economy due to their high cost performance, mature technology and good safety performance. More than 70.0% of the secondary battery market share. In recent years, the rapid development of my country's automobile industry has stimulated the rapid development o...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B13/00C22B1/11H01M10/54
CPCC22B1/11C22B7/006C22B13/045H01M10/54Y02P10/20Y02W30/84
Inventor 刘伟锋邓循博傅新欣朱鹏春令红斌张杜超陈霖杨天足
Owner CENT SOUTH UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap