PROCESS OF ISOLATING EXTREMELY PURE HUMIC ACIDS FROM OXIHUMOLITES OR FROM PEAT

摘要

isolation of highly pure huminovu00fdch acids from oxihumolitu016f or of peat is carried out by using different cleaning and separation operations.first, the raw materials are subjected to alkaline extraction in an aqueous medium at a temperature lower than the 50.degree.c and a ph of less than 9.the suspension obtained is dekantacu00ed, centrifugation and filtration, and then the liquid phase separated by ultrafiltration on the membrane.from the permeate, which is the product of the separation and contains only a small proportion of inorganic accompanying substances originating from the original raw materialswith humic acids after the concentration koaguluju00ed mineral acid, and after the separation of phases with. the washing can use dilute mineral acid and water or only voda.u0155