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Method for converting solid lead chloride into lead oxide

A technology of lead chloride and lead oxide, applied in the direction of lead monoxide and lead oxide, which can solve the problems of chlorine gas escape, environmental pollution, and poor control of the process, so as to avoid escape and leakage, friendly working environment, and process easily controlled effects

Active Publication Date: 2014-02-12
SHENYANG RES INST OF NONFERROUS METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In the above scheme, the two methods (1) and (2) precipitate chlorine gas on the anode, which can easily cause chlorine gas to escape and leak, worsen the working conditions, and cause environmental pollution; (3) and (4) two methods have ion Poor membrane performance, short life, high production cost, poor control of the process, etc.

Method used

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  • Method for converting solid lead chloride into lead oxide

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Effect test

Embodiment 1

[0025] Carry out the first step conversion of solid lead chloride, calcium oxide and water according to a certain liquid-solid ratio. The technical conditions for the first step conversion of lead chloride are: the mass ratio of lead chloride to calcium oxide=9:1, liquid-solid Ratio 4:1, transformation temperature 60°C, reaction time 90 minutes; after the reaction is completed, liquid-solid separation is carried out; the first step conversion slag PbOHCl is carried out in a certain concentration of sodium hydroxide solution for the second step transformation, and after the reaction is completed, liquid Solid separation to obtain conversion slag PbO and secondary conversion liquid. The technical conditions for the second conversion step are: the mass ratio of basic lead chloride to sodium hydroxide=5:1, the concentration of sodium hydroxide solution is 15%, and the conversion reaction The temperature was 75°C, and the reaction time was 75 minutes.

[0026] Results: The conversi...

Embodiment 2

[0030] Carry out the first step conversion of solid lead chloride, calcium oxide and water according to a certain liquid-solid ratio. The technical conditions for the first step conversion of lead chloride are: the mass ratio of lead chloride to calcium oxide=9:1, liquid-solid The ratio is 5:1, the conversion temperature is 70°C, and the reaction time is 120 minutes; after the reaction is completed, the liquid-solid separation is carried out; the first step conversion slag PbOHCl is carried out in a certain concentration of sodium hydroxide solution for the second step conversion, and after the reaction is completed, the liquid Separation of solids to obtain conversion slag PbO and liquid after secondary conversion. The technical conditions for the second step conversion are: the mass ratio of basic lead chloride to sodium hydroxide=4:1, the concentration of sodium hydroxide solution is 15%, and the conversion reaction The temperature was 75°C, and the reaction time was 30 minu...

Embodiment 3

[0035] Carry out the first step conversion of solid lead chloride, calcium oxide and water according to a certain liquid-solid ratio. The technical conditions for the first step conversion of lead chloride are: the mass ratio of lead chloride to calcium oxide=10:1, liquid-solid Ratio 4:1, transformation temperature: 60°C, reaction time 120min; after the reaction is completed, liquid-solid separation is carried out; the first step transformation slag PbOHCl is carried out in a certain concentration of sodium hydroxide solution for the second step transformation, and after the reaction is completed, carry out Liquid-solid separation to obtain conversion slag PbO and liquid after secondary conversion. The technical conditions for the second conversion step are: the mass ratio of basic lead chloride to sodium hydroxide=4.5:1, the concentration of sodium hydroxide solution is 17.5%, and the conversion The reaction temperature was 75°C, and the reaction time was 75 minutes.

[0036]...

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Abstract

A method for converting solid lead chloride into lead oxide is characterized by comprising the following steps: (1) placing solid lead chloride and calcium oxide according to a liquid-solid ratio of 4-7:1 into a conversion tank with a stirrer to perform a first step conversion; and (2) reacting basic lead chloride PbOHCl generated in the first step conversion with sodium hydroxide solution to perform a second step conversion and further to generate solid lead oxide and a secondary conversion liquid. According to the method, the wet-process metallurgy technology is employed for converting lead chloride into lead oxide, lead oxide subjected to purification can be used as a chemical product, also can be used to prepare lead acid batteries, and also can be further processed into metallic lead.

Description

technical field [0001] The invention relates to a method for converting solid lead chloride, in particular to a method for converting solid lead chloride into lead oxide in an aqueous solution, and belongs to the technical field of lead hydrometallurgy. Background technique [0002] At present, pyrometallurgy technology is mainly used at home and abroad to extract metallic lead from lead sulfide concentrate. In recent years, with the wide application of modern oxygen lead smelting technology, the process of pyrometallurgical lead smelting has made remarkable progress in terms of smelting efficiency, energy consumption and environmental protection. However, these pyrometallurgical technologies cannot completely eradicate environmental pollution, especially the problem of lead pollution. Because of this, developed countries such as the United States and Western Europe have begun to limit the production of pyrometallurgical lead in recent years. From the perspective of long-t...

Claims

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Application Information

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IPC IPC(8): C01G21/06
Inventor 王德全李淑梅刘凯华丛自范
Owner SHENYANG RES INST OF NONFERROUS METALS
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