| 摘要 |
<p>In order to prepere cheap ferric polysulfate starting from scraps formed during cutting operations, dust originated from converters, blast furnace ash, neutralized sludge, and/or burned sludge thereof which have never been reused, a method for preparing a ferric polysulfate solution is proposed, having a basicity comprising a first step for dissolving dust originated from converters, blast furnace ash, scraps formed during cutting operation, neutralized sludge originated from waste water treatment or burned sludge thereof in a sulfuric acid solution containing trivalent iron in an amount ranging from 5 g/liter to 50 g/liter, at a temperature ranging from 60 to 95 DEG C, while controlling the molar ratio: SO4/Fe in the resulting solution to a level of not less than 1.5 and not more than 1.75; and a second step for oxidizing the resulting solution.</p> |
