| 摘要 |
<p>1411904 Removal of mercury from aqueous solutions SUMITOMO CHEMICAL CO Ltd 26 April 1973 [26 April 1972] 20002/73 Headings C1C and C1A [Also in Division C2] Mercury or a mercury containing compound (which has been used as a sulphonation catalyst) is removed from an aqueous solution of alphaanthraquinone sulphonic acids or their salts by a process which comprises (a) a first step of reacting with the solution a thiosulphate to precipitate mercury sulphide and removing the precipitate by filtration and (b) a second step of salting out the alpha-anthraquinone sulphonic acids or their salts, reacting a halate in the presence of a hydrogen halide with the waste water, filtering off the insoluble halogenoanthraquinone thus formed, and contacting the resulting waste water with a mercury-adsorbing substance to adsorb the contained mercury or mercury-containing compound or reacting it with a thiosulphate to precipitate mercury sulphide which is then removed by filtration. The thiosulphate may be sodium, ammonium, potassium or calcium thiosulphate and the halate may be a chlorate, bromate or iodate, preferably sodium or potassium chlorate or bromate. The mercury-adsorbing substrate may be a dithizone type chelate resin, iminediacetic acid type chelate resin, sulphur-containing urea-formaldehyde type chelate resin, a thiol compound or a dialkyldithiocarbamic acid compound.</p> |
