The precipitation and hydrolysis of uranium (VI) in aqueous Solutions of uranyl nitrate — potassium hydroxide — neutral electrolyte, was investigated. Clear and stable systems of uranyl nitrate and potassium hyđroxide, were studied, in equivalent concentration of 2 X10-3 N. The pH value, of the mentioned system was between 5 and 6. By addition of neutral electrolytes (potassium, calcium, strontium, barium, yttrium, and lantanum nitrate) the precipitation process was initiated and up to 70% of the uranium present was precipitated. The experimental results showed, that the precipitation of uranium (VI), in the observed system, was accomplished by several mechanisms, t.e. hydrolysis, coagulation, and formation of mixed uranates
