▎ 摘　　要

NOVELTY - Five-step leaching useful for repairing heavy metal soil comprises e.g. (i) adding polyanionic cellulose, magnetic graphite, graphene oxide, magnetic chitosan, activated carbon fiber, isopropanol and deionized water, and mixing and stirring, (ii) adding polluted soil, stirring, filtering, and removing the filtrate, (iii) adding rice husk ash, phenolase lignin, humic acid and deionized water, stirring, filtering, and removing filtrate, (iv) adding chicken manure biological carbon, reed straw biological carbon, and walnut biological carbon, heating, stirring, filtering, and removing filtrate, (v) adding sepiolite, mushroom bran, and lychee shell powder, stirring at a speed of 100-200 rpm for 10-20 minutes, filtering, and removing filtrate, (vi) adding 5-10 mg ammonium nitrate, and 3-6 mg ammonium oxalate, stirring at speed of 200-300 rpm for 10-20 minutes, filtering, and removing filtrate, and (vii) measuring the content of heavy metal ions in the treated soil. USE - The five-step leaching is useful for repairing heavy metal soil. ADVANTAGE - The method: has high removing rate of heavy metal ions and mercury ions and lead ions, and good restoration effect of heavy metal polluted soil; and removes copper ion and cadmium ion completely. DETAILED DESCRIPTION - Five-step leaching useful for repairing heavy metal soil comprises (i) adding 3-5 mg polyanionic cellulose, 2-4 mg magnetic graphite, 2-5 mg graphene oxide, 4-7 mg magnetic chitosan, 2-5 mg activated carbon fiber, 10-20 ml isopropanol and 1000-2000 ml deionized water, and mixing and stirring for 10-20 minutes, (ii) adding 250-300 g polluted soil, stirring at a rotation speed of 200-250 rpm for 20-30 minutes, filtering, and removing the filtrate, (iii) adding 3-6 mg rice husk ash, 4-8 mg phenolase lignin, 4-6 mg humic acid and 1000-2000 ml deionized water, stirring for 5-10 minutes, filtering, and removing filtrate, (iv) adding 3-5 mg chicken manure biological carbon, 3-6 mg reed straw biological carbon, and 4-8 mg walnut biological carbon, heating to 50-60 degrees C, stirring for 15-20 minutes, filtering, and removing filtrate, (v) adding 3-6 mg sepiolite, 4-8 mg mushroom bran, and 1-2 mg lychee shell powder, stirring at a speed of 100-200 rpm for 10-20 minutes, filtering, and removing filtrate, (vi) adding 5-10 mg ammonium nitrate, and 3-6 mg ammonium oxalate, stirring at speed of 200-300 rpm for 10-20 minutes, filtering, and removing filtrate, and (vii) measuring the content of heavy metal ions in the treated soil.