Process for the production of nano lead oxides
AssigneeTai-Kwong-Yokohama Battery Industried Sdn Bhd
InventorSiew Hon Chow
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Abstract
Provided is a process for producing fine particles of pure lead oxide from a waste lead oxide paste obtained from exhausted lead-acid batteries. The lead oxide particles so produced are substantially spherical and have a weight average particle size from about 13 nm to about 100 nm, which, are of nano-particle dimensions. The process according to the present invention is capable to produce pure lead oxide of PbO2 and lead oxide of Pb3O4 or commonly known as red lead.
Claims9
A process for producing fine particles of pure lead oxide from a waste lead oxide paste obtained from exhausted lead-acid batteries characterizes in that said lead oxide particles are substantially spherical and have a weight average particle size from about 13 nm to about 100 nm.
A process for producing fine particles of pure lead oxide from waste lead oxide paste as starting material characterizes by the following steps;
- reacting said starting material with a sodium-based solution to convert the lead compounds therein to insoluble lead carbonate;
- dissolving said insoluble lead carbonate by reacting with an acid-based solution to form lead-based solution;
- recovering lead oxide powder from said lead-based solution by process of crystallization;
- reacting said lead oxide powder with chlorine and rinsing the resultant lead bearing compound with water;
- and
- heating said resultant lead bearing powder to form nano lead oxide particles
Dependencies are inferred from the claim text.