▎ 摘　　要

NOVELTY - Process for treating heavy metal ions in industrial sewage involves (a) preparing adsorption material which is a yeast/gel/high-iron fly ash composite material comprising 120-140 pts. wt. high-speed iron fly ash, 20-40 pts. wt. graphene oxide, 20-40 pts. wt. chitosan, 20-30 pts. wt. beta -cyclodextrin, 20-40 pts. wt. epichlorohydrin, 10-20 pts. wt. polyvinyl alcohol, 8-15 pts. wt. sodium alginate, and 30-50 pts. wt. yeast, (b) treating industrial wastewater by precipitation and decolorization, adding the adsorption material to the pre-treated industrial sewage, mixing thoroughly, and leaving to stand for more than 4 hours, (c) applying a magnetic field to separate the adsorbent from the water body, and electrolytically reducing the separated adsorbent with heavy metal ions in an electric field to replace the elemental metal, desorbing the elemental metal from the adsorption material, and concentrating the solution containing elemental metal. USE - The process is used for treating heavy metal ions in industrial sewage. ADVANTAGE - The process has high removal rate of heavy metals, large adsorption capacity, strong adsorption capacity, low processing cost, stable transportation effect, and recovers the processed adsorbed particles and heavy metal ions more conveniently. DETAILED DESCRIPTION - Process for treating heavy metal ions in industrial sewage involves (a) preparing adsorption material which is a yeast/gel/high-iron fly ash composite material comprising 120-140 pts. wt. high-speed iron fly ash, 20-40 pts. wt. graphene oxide, 20-40 pts. wt. chitosan, 20-30 pts. wt. beta -cyclodextrin, 20-40 pts. wt. epichlorohydrin, 10-20 pts. wt. polyvinyl alcohol, 8-15 pts. wt. sodium alginate, and 30-50 pts. wt. yeast, where the process for preparing the yeast/gel/high-iron fly ash composite material involves (a1) ball milling the fly ash, sieving, and magnetically separating by a magnetic separator to obtain a particle size of 5-12 mu m, obtaining medium-magnetic high-iron fly ash with a specific saturation magnetization of 5-12 emu/g, (a2) adding the medium magnetic high-iron fly ash obtained in step (a1) to distilled water, stirring and dispersing uniformly at a temperature of 30-40 degrees C, adding graphene oxide, chitosan, beta -cyclodextrin and epichlorohydrin, and reacting for 2-4 hours after stirring, (a3) adding polyvinyl alcohol and sodium alginate to the mixed solution in step (a2), continously stirring and reacting for 1-2 hours to obtain a gel/high-iron fly ash composite material, (a4) adding yeast to the mixed solution in step (a3), and continuously reacting for 30-40 minutes under stirring conditions, applying a magnetic field to separate the solids and drying at 40-60 degrees C to obtain a yeast/gel/high-iron fly ash composite material, (b) treating industrial wastewater by precipitation and decolorization, adding the adsorption material to the pre-treated industrial sewage, mixing thoroughly, and leaving to stand for more than 4 hours to reach the adsorption balance of heavy metals, (c) applying a magnetic field to separate the adsorbent from the water body, and electrolytically reducing the separated adsorbent with heavy metal ions in an electric field to replace the elemental metal, desorbing the elemental metal from the adsorption material, separating the adsorption material by an external magnetic field, and concentrating the solution containing elemental metal.