Title:
METHOD FOR RECOVERING LEAD FROM WASTE LEAD-ACID BATTERY LEAD PASTE IN WET PROCESS
Document Type and Number:
WIPO Patent Application WO/2019/071642
Kind Code:
A1
Abstract:
A method for recovering lead from waste lead-acid battery lead paste, relating to the technical field of hydrometallurgy. In the method, firstly a reducing agent and lead paste are added into a zinc chloride solution for leaching in a stirring mill to cause lead in the lead paste to enter the solution. Lead is replaced with metallic zinc in the leached liquid. After the lead replacement, the zinc chloride solution is controlled to generate electrolytic zinc by electrodeposition at a small amount. The reducing agent is metallic zinc or metallic lead or hydrogen peroxide. A part of the electrolytic zinc is returned as a reducing agent for use in leaching. When the metallic lead or the hydrogen peroxide is used as the reducing agent, the step of returning the electrolytic zinc as a reducing agent can be omitted. The remaining electrolytic zinc is returned as a displacer for replacing lead. A small amount of calcium chloride is added to the electrodeposited liquid to remove sulfate radicals, and the resulting product is then returned as a leaching agent for use in lead paste leaching. The process features a short process flow, fewer process steps, and low energy consumption, and meets environmental protection requirements for clean production.
Inventors:
WANG CHENGYAN (CN)
XING PENG (CN)
CHEN YONGQIANG (CN)
XING PENG (CN)
CHEN YONGQIANG (CN)
Application Number:
PCT/CN2017/106567
Publication Date:
April 18, 2019
Filing Date:
October 17, 2017
Export Citation:
Assignee:
UNIV BEIJING SCIENCE & TECHNOLOGY (CN)
International Classes:
C22B7/00; C22B13/00; H01M10/54
Domestic Patent References:
| WO2015195454A1 | 2015-12-23 |
Foreign References:
| CN106086414A | 2016-11-09 | |||
| CN101289706A | 2008-10-22 | |||
| CN106995886A | 2017-08-01 | |||
| CN104357668A | 2015-02-18 | |||
| CN101157987A | 2008-04-09 | |||
| CN105907974A | 2016-08-31 |
Attorney, Agent or Firm:
BEIJING GUANGYOU PATENT FIRM LTD. (CN)
Download PDF: