Process for preparation of lead compounds

A process for the preparation of water insoluble lead compounds having a composition represented by the following general formula

• nPbO.PbX.sub.2/x
• wherein X stands for an inorganic acid or organic acid radical, x indicates the valency of the radical X and n is a number of from 0 to 5, which comprises reacting a lead monoxide with an acidic component which is a corresponding inorganic acid, its acidic oxide, a corresponding organic acid or an acid anhydride of said organic acid of an acetic acid or of an acetic acid or in the presence of no more than a catalytic amount of an acetic acid, wherein the lead monoxide is a lead monoxide containing a higher lead oxide selected from the group consisting of lead dioxide and minimum in an amount of 0.001 to 5% by weight based on the total weight and being obtained by charging granules of metallic lead, an aqueous liquid medium and oxygen in a rotary mill, rotating the rotary mill under such conditions that at least parts of the metallic lead granules wetted with the liquid medium are located in the gas phase above the level of the liquid medium and friction is caused among the metallic granules through the liquid medium, to thereby form a dispersion of very fine particles of lead monoxide in the liquid medium and separating the dispersion from the metallic lead granules, and wherein the lead monoxide in the form of the as-prepared dispersion is mixed with said acidic component in the presence of 0.001 to 5% by weight, based on the lead monoxide, of an acid addition salt of hydroxylamine with a nonoxidizing acid under such conditions that the initial pH value of the mixture is maintained at a level not higher than 7, said acid addition salt being present in an amount sufficient to reduce most or all the lead dioxide or minimum in the starting lead monoxide.