METHODS FOR PRODUCING HYDRATED LEAD OXIDES IN THE BIVALENT STATE AND TRI- AND TETRA-BASIC LEAD SULPHATES

摘要

PCT No. PCT/AU85/00167 Sec. 371 Date Mar. 3, 1986 Sec. 102(e) Date Mar. 3, 1986 PCT Filed Jul. 25, 1985 PCT Pub. No. WO86/00878 PCT Pub. Date Mar. 13, 1986.Process for the manufacture of hydrated lead oxides in the bivalent state characterized by the step of (1) reacting metallic lead with acetic acid (e.g. ammonium acetate, 5%-30% solution) at a temperature up to 200 DEG C. (e.g. 50 DEG -200 DEG C.) under an atmosphere of an oxygen containing gas (e.g. oxygen) of between 1 and 10 atmospheres absolute pressure to form lead acetate, then (2) reacting the lead acetate with a source of ammonium ion (e.g. ammonia) under an absolute pressure between 1 and 5 atmospheres at a temperature up to 100 DEG C. (e.g. 60 DEG -90 DEG C.) to precipitate lead oxides and, optionally, to produce tri- and tetra- basic lead sulphates, by (3) adding to the lead oxides so precipitated sulphuric acid in the stoichliometric amount to produce tri- or tetra- basic lead sulphate, then (4) separating and drying the tri- or tetra- basic lead sulphate so formed.