Effect Of Hydrous Ferric Oxide On The Migration Of Lead And Its Complexes In Lead-zinc Tailings Ponds

In lead-zinc mine tailings,minerals such as pyrite and pyrrhotite can be hydrolyzed to form hydrated iron oxide colloids with adsorption capacity,and acidic ore water can be dissolved from lead with low content of tailings and beneficiation wastewater.A large number of unutilized ore dressing xanthates can form complexes.The adsorption and migration behavior of the complexes between hydrous ferric oxide colloids and water is a key issue for the geochemical mechanism of minerals in tailings mines and minerals.It can be determined whether the complexes can be enriched in hydrous ferric oxide colloids.Up until the tailings again gathered in the mine.In this study,a self-made simulation device was used to simulate the environment of the tailing pond.After 60 days of leaching experiments,inductively coupled plasma emission spectrometry,atomic absorption spectrometry,ultraviolet spectrophotometer,and precision pH meter were used to collect the leached filtrate.Measured,using scanning electron microscopy,X-ray diffractometer and other instruments to simulate the leaching of simulated tailing particles,the experimental results are when the iron ion content is 200mg/L,lead ion content is 30mg/L,the xanthate content is After the 100 mg/L leaching solution was subjected to a leaching column filled with simulated tailings particles,the content of iron and lead ions in the leached solution was less than 0.01 mg/L and 0.005 mg/L,respectively,and the content of xanthate was less than 1 mg/L.The results were obtained:?1?The solution containing trivalent iron ions can undergo hydrolysis reaction under weakly acidic conditions,and the hydrolysis rate increases with increasing pH value.When the pH value increases to 8-9,the trivalent iron ion is completely hydrolyzed to form Fe?OH?₃ flocculation,with the advancing of the reaction time,gradually agglomerate,forming a colloidal membrane coating on the surface of the particulate matter,or as a non-crystalline precipitate filled in the fissures of the primary particles.?2?When xanthate with ore dressing is present in the solution containing trivalent iron ions,the hydrated iron oxide compound is eventually formed as the pH value of the solution gradually increases,but the position of the hydrated iron oxide colloid that forms agglomerates and precipitates will be lower than The position of the xanthate-containing drug decreases,and the morphology of the hydrated hydrous iron oxide coating that forms the amorphous state is also significantly different.Therefore,the addition of xanthate will not hinder the formation of hydrated iron oxide colloids,but it will affect the morphology,structure,particle size and dispersibility of hydrated iron oxide colloidal precipitate particles.?3?In the tailings-water system,when the pH value in the system is gradually increased,metal iron ions in the waste water are hydrolyzed to form hydrated iron oxide colloids,hydrated iron oxide colloids are continuously increased and agglomerated and adhered to the surface of the particulate matter to form an amorphous film.The surface morphology may vary due to various factors during the formation.The heavy metal ions Pb in the aqueous solution will be adsorbed on hydrous iron oxide colloids.When the aqueous solution contains xanthate,the xanthate will form insoluble hydrophobic with metal lead ions.Complexes,the resulting complexes can increase the migration distance of lead,but still be adsorbed by hydrated iron oxide colloids,and have a large amount of adsorption,preventing the migration of heavy metal lead to the surrounding ecological environment.