Hign-purity manganese carbonate from the manganiferous waste water was produced from the manufacture of 1,4-dihydroxy benzene, especially the preparations from waste water containing plenty of natrium and sulphate were studied.

The technology of calcium-removing in the production of high-purity manganese carbonate is studied in which the manganiferous waste water from the production of 1,4-dihydroxy benzene is as raw material.

This paper is on obtaining high-purity manganese carbonate from the manganiferous waste water produced from the manufacture of 1 ,4-dihydroxy benzene, especially researching on its preparation from waste water Containing plenty of Calcium, natrium, ammonium and Sulphate, which can make the components of calcium, natrium and sulphate in products catch up with GB 10503-89 Grade.

The experimental research of SO 2 desulphurization with manganese waste slag from a MnSO 4·H 2O production plant has been done in lab.

In this paper, recycling and utilization of the manganiferous by-product generated in the hydrometallurgical process of Mn is studied, and a method for impurities removal is proposed on the basis on characteristic of a higher component of manganese dioxide.

Electrochemical Oxidation of the simulated Mn wastewater with the three-dimensional electrode was studied through the experiment.

The effect of electrolysis sediment of waster water in EMM,under the best productive condition,will reach 62.