| 摘要 |
<p>Agent (I) for removing Hg and/or Hg salts from waste waters, opt. contng. sludge and inert products in suspension, contains or consists of thiourea and/or a hydroxylamine salt. In pref. process, waste waters brought to pH 9-14, are treated with (I) and ppte. obtd. is separated by clarifying-flocculation. Ppte. is flocculated by adding an acid coagulant, pref. an acid soln. of FeCl3 in concn. 10-200 g./m.3 slurry, which pptes. as flakes opt. thickened by adding 0.1-10 g./m.3 polyalcohols and/or polyacrylamides. Used for treating industrial effluents, e.g. from prepn. of Cl2 and alkalies with Hg cathode cells, prepn. of Hg derivs., Hg and Hg recovery by waste processing. Sludges and inert products need not be separated by filtration or decantation upstream of purification plant. Activity of (I) is independent of Hg of Hg salt concn. (I) act as precipitants, forming insoluble Hg salts, e.g. HgS, and as reducing agents w.r.t. Cl2.</p> |
