direct reduction of chromates from cr vi to criii with ferrous sulphate in the environment at a ph greater than 5, and its applicazionim in field

摘要

the object of this invention is to propose the use, as a reducing agent, the ferrous sulphate which works in the environment of acid.compared with the traditional method (use of sulphur dioxide in acid), offers the advantage of a working environment clean, no problem of corrosion.shorter working time and lower costs.