Lead paste smelting process

A processing technology and lead paste technology, which is applied in the field of lead paste smelting and processing technology, can solve the problems such as the purity of metal lead cannot meet the requirements, and achieve the effects of improving production capacity, strong reducing ability and wide source.

Active Publication Date: 2019-11-29
ANHUI NARADA RENEWABLE RESOURCE TECH CO LTD
View PDF8 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The Chinese patent with the patent number CN201310721550.8 discloses a method for smelting lead-containing paste of waste lead-acid batteries. The method controls the reducing atmosphere to produce crude lead while utilizing copper-containing slag and waste lead-acid battery Sulfur reaction to obtain copper matte, which is rich in copper and sulfur, realizes the direct recovery of lead, copper and sulfur, but this method will introduce impurities such as Si and Ca, so that the purity of the recovered metal lead cannot meet the requirements

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
  • Lead paste smelting process
  • Lead paste smelting process
  • Lead paste smelting process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] A process for melting and processing lead paste, comprising the steps of:

[0050] The first step, raw material pretreatment: waste lead plaster, the dismantled product of waste lead-acid batteries, is washed with water until the pH value is 6.8, then dried at 110°C, ground, and passed through a 180-mesh sieve;

[0051] The second step, impurity removal: waste lead paste with 3mol / L H 2 SO 4 The solution was soaked at a temperature of 95°C for 50 minutes, and after liquid-solid separation, it was washed with water until the pH value was 6.8 to obtain an acid-treated lead paste;

[0052] The third step, the first smelting: add the acid-treated lead paste into the furnace body 21 of the smelting furnace, and add it in three to four times. Cause the furnace body to swing, loosen and flatten the pile of materials until the acid-treated lead paste is completely added, turn on the heating to melt the acid-treated lead paste in the melting furnace, then add the mixture of le...

Embodiment 2

[0057] A process for melting and processing lead paste, comprising the steps of:

[0058] The first step, raw material pretreatment: waste lead plaster, the dismantled product of waste lead-acid batteries, is washed with water until the pH value is 6.9, then dried at 110°C, ground, and passed through a 180-mesh sieve;

[0059] The second step, impurity removal: waste lead paste with 3mol / L H 2 SO 4 The solution was soaked at a temperature of 96°C for 55 minutes, and after liquid-solid separation, it was washed with water until the pH value was 6.9 to obtain an acid-treated lead paste;

[0060] The third step, the first smelting: add the acid-treated lead paste into the furnace body 21 of the smelting furnace, and add it in three to four times. Cause the furnace body to swing, loosen and flatten the pile of materials until the acid-treated lead paste is completely added, turn on the heating to melt the acid-treated lead paste in the melting furnace, then add the mixture of le...

Embodiment 3

[0065] A process for melting and processing lead paste, comprising the steps of:

[0066] The first step, raw material pretreatment: waste lead plaster, the dismantled product of waste lead-acid batteries, is washed with water until the pH value is 7, then dried at 110°C, ground, and passed through a 180-mesh sieve;

[0067] The second step, impurity removal: waste lead paste with 3mol / L H 2 SO 4 The solution was soaked at a temperature of 98°C for 60 minutes, and after liquid-solid separation, it was washed with water until the pH value was 7 to obtain an acid-treated lead paste;

[0068] The third step, the first smelting: add the acid-treated lead paste into the furnace body 21 of the smelting furnace, and add it in three to four times. Cause the furnace body to swing, loosen and flatten the pile of materials until the acid-treated lead paste is completely added, turn on the heating to melt the acid-treated lead paste in the melting furnace, then add the mixture of lead o...

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 lead paste smelting process. The process includes the following steps: firstly, raw material pretreatment; secondly, impurity removal; thirdly, primary smelting, wherein acid-treated lead paste is molten in a melting furnace, and then a mixture of lead oxide and starch is added and smelted at a low temperature to obtain first smelt; fourthly, secondary smelting, wherein the first smelt is heated and molten and kept warm, then starch is added to the first smelt, and reaction and discharging are conducted to complete smelting. There are two smelting steps; the primary smelting is low-temperature smelting, in the low-temperature smelting, NaOH is adopted as a desulfurizing agent, starch is adopted as a reducing agent, and polysaccharide starch is adopted as a naturalhigh-molecular substance, sources are wide, no harmful impurities are introduced, the reducing capacity is strong, and the desulfurization conversion and reduction conversion of lead paste are simultaneously realized through a hydrothermal reduction method; in the secondary smelting, starch is directly adopted as a reducing agent for reducing PbO to obtain high-purity lead. After testing, the recovery rate of metal lead can reach 96.0% or above, and the purity of the recovered metal lead reaches 99.95% or above.

Description

technical field [0001] The invention belongs to the technical field of lead paste smelting, and in particular relates to a lead paste smelting process. Background technique [0002] Waste lead-acid batteries are the main raw materials for secondary lead. After the recovered waste lead-acid batteries are crushed to a certain particle size, a hydraulic or medium sorting system is used to produce hard rubber, plastic, lead-antimony alloy particles and lead-containing paste sludge, of which the lead-containing paste sludge mainly contains PbSO 4 , PbO 2 , PbO and Pb, etc. At present, there are two treatment processes for metal lead recovery from lead-containing plaster sludge: fire method and wet method. [0003] The pyrometallurgy of lead-containing paste generally adopts the method of reduction smelting, which has the disadvantages of low heat utilization efficiency of smelting furnace and high production energy consumption. At the same time, the produced flue gas contains l...

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): C22B7/00C22B13/02H01M10/54C22B3/08C22B13/00
CPCC22B7/001C22B7/007C22B13/025C22B13/045H01M10/54Y02W30/84Y02P10/20
Inventor 朱保义沈岑宽陈华勇吴国庆王武钧卢山龙任永刚胡磊
Owner ANHUI NARADA RENEWABLE RESOURCE TECH CO LTD
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