Study On Uranium Pollution In Wastewater/Soil Separated By M-HAP Magnetic Absorption

The rapid development of nuclear power industry and nuclear weapons,the demand for uranium resources is growing,and the processes of uranium mining and smelting are important ways for uranium to be enriched and polluted in the environment.The“three wastes”emissions from uranium mines cause water and soil.Radioactive pollution,heavy metals such as uranium cannot be biodegraded in the ecological environment.The potential hazards are persistent and can accumulate in the organism through the food chain.Chemical toxicity and radioactivity in the decay of uranium can induce cancer and cause radioactive diseases.In this paper,a magnetic hydroxyapatite adsorbent(M-HAP)was prepared by co-precipitation method,combined with scanning electron microscopy(SEM),hysteresis loop(VSM),energy spectrum(EDS),and X-ray diffraction(XRD)analysis.Means,the morphology and structure of the adsorbent were characterized.The results show that the magnetic core particles are stably supported on the surface of hydroxyapatite,have good magnetic properties,and can be separated from water rapidly under the condition of external magnetic field.Fe/P increases and increases.The Freundlich adsorption isotherm model can better describe the adsorption capacity of magnetic hydroxyapatite,and the reaction conforms to the quasi-first-order and quasi-secondary adsorption rate models.The results of magnetic adsorption separation technology combined with magnetic adsorbent treatment of uranium-containing wastewater show that uranium adsorption activity ranks from high to low in the low dose range to magnetic hydroxyapatite>magnetic iron manganese oxide>magnetic sepiolite>Magnetic chitosan > Magnetic hydroxy iron(magnetic nucleus component: active ingredient = 3:1).M-HAP is the optimum condition for pH=5-6,initial uranium concentration of 5mg/L,dosage of 0.16g/50ml(3.2g/L),reaction time of 60 min,M-HAP for uranium in water.The removal effect is the best,the removal rate is above 95%,and the adsorption activity has not been greatly reduced after five cycles of the adsorption.The preparation of the adsorbent is simple,the cost is low,the recovery is convenient,the secondary pollution is small,and the potential industrial value is.The results of magnetic adsorption separation technology combined with magnetic hydroxyapatite treatment of uranium-containing soil showed that the optimal conditions of M-HAP for magnetic adsorption separation technology in different soil samples were mechanical agitation for 5 h,weak acid adjustment for pH=5,and M-HAP The addition of 5%(5% of the experimental soil samples),under the optimal conditions,the magnetic adsorption efficiency can reach about 60%,and the removal rate of the six soil magnetic adsorption uranium obtained from a mine in the north is between 41.6% and 64.4%.The oxidant hydrogen peroxide can increase the magnetic adsorption efficiency of the soil,and the magnetic adsorption removal rate of uranium in some soil samples can be increased by 30-40%.The results of SEM test showed that the morphology of 1#-6# soil before and after magnetic adsorption did not change significantly.The EDS results showed that the soil uranium content of 1#-6# decreased significantly after magnetic adsorption.M-HAP has high magnetization and can effectively achieve solid-solid separation(magnetic adsorbent and test soil).The effect on soil properties before and after reaction is not significant,which provides a theoretical basis for future improvement of mine soil.