초록 ▼

The invention relates to a method for removing heavy metal sulphides from dilute aqueous systems as they are present in numerous chemical processes. The method is characterized in that water-soluble polymers such as polyethyleneimines, homopolymers or copolymers of derivatives of acrylic acid or met

The invention relates to a method for removing heavy metal sulphides from dilute aqueous systems as they are present in numerous chemical processes. The method is characterized in that water-soluble polymers such as polyethyleneimines, homopolymers or copolymers of derivatives of acrylic acid or methacrylic acid or homopolymers or copolymers of styrenesulphonic acids are added to said systems and the systems are then filtered.

대표청구항 ▼

A process for substantially removing HgS from hot and strongly acid dyestuff or dyestuffs precursor waste effluents consisting essentially of sequentially adding firstly an anionic polymer comprising an acrylic acid/acrylamide or methacrylic acid/acrylamide copolymer and secondly a cationic polymer

A process for substantially removing HgS from hot and strongly acid dyestuff or dyestuffs precursor waste effluents consisting essentially of sequentially adding firstly an anionic polymer comprising an acrylic acid/acrylamide or methacrylic acid/acrylamide copolymer and secondly a cationic polymer comprising a homopolymer or copolymer of a compound of the formula [Figure] in which R is H or CH3; R1, R2 and R3 independently of one another are H, CH3, C2H5 or C3H7; Alkylene is an alkylene radical containing 2 to 5 carbon atoms; and Xis an anion in amounts of from 1 to 100 ppm of cationic and anionic polymer based on the amount of effluent or dyestuff precursor to a dilute aqueous dyestuff waste effluent containing from 5 to 10,000 ppm of mercury sulfide in acid aqueous suspension, the ratio of cationic polymer to anionic polymer ranging from 5:1 to 1:5 by weight, said effluent having a pH of less than 2 and a temperature of from 60°C. to about 120°C., to agglomerate the mercury sulfide into stable, coarse flocs, and then removing said flocs from the effluent by filtration.