Process for the manufacture of ferric coagulant from acid drainage of coal mine and Its Coagulant

摘要

Process for the manufacture of ferric coagulant from acid drainage of coal mine and its coagulant.The present invention relates to a process for the manufacture of coagulant ferric and ferric coagulant unclean from the acid drainage of coal mine.The ferric coagulant prepared is intended for the treatment of drinking water and the impure ferric coagulant is intended for the treatment of domestic sewage and industrial effluent.For such purposes, the product must have a low content of manganese and a high content of iron and aluminum trivalent.The invention consists of an initial stage of leaching of pyrite.Where is obtained from an aqueous solution with a high concentration of iron; followed by a first step of neutralization with addition of alkali.In order to obtain a sludge rich in iron and aluminum as the precipitate; and a second step of neutralization, with the addition of alkali.In order to obtain a sludge rich in iron and with some metallic impurities in the form of oxides and hydroxides.The precipitated sludge is added strong acid, for obtaining a coagulant concentrate iron and aluminum and a coagulant concentrate iron and aluminum impure.