Study Of Leaching Law And Transformation Model Under Soil-water Interfaces Of Sb In Antimony Ore Stack Area

The rapid development of modern industry brings about the growing deman d for antimony and its compounds.Excessive mining of antimony leads to a larg e amount of tailings piled up in the antimony ore stacking area.And due to lac k of effective treatment measures,these tailings deposited in the open air will re lease a great deal of antimony elements under the erosion by rainfall or snowm elt. These antimony elements infiltrate into the soil and the surrounding rivers wi th the action of stormwater runoff and osmosis,which makes terrific pollution to the surrounding environment.This paper takes antimony ore stacking area of Le ngshui River in Hunan as the research object.The release law of antimony in va rious kinds of waste around the stacking area and its migration and transformati on process at the soil-water interface were studied,and the pollution emissions i n the entire stacking area are predicted.Do field reconnaissance of antimony ore stacking area of Lengshui River,an d sample three kinds of waste with the largest in the entire stacking area(smelti ng slag,tailings,waste ore).Aimed at the optimal release conditions which antimo ny released from the three kinds of waste and the factors influencing the releas e of antimony element from the waste under natural conditions,the dynamic,stati c leaching experiments are done.The experimental results show that:in the same condition,smelting slag has the highest amount in releasing antimony among the three kinds of waste;the particle size of the waste,the pH of rain water,rainfall intensity and rainfall duration affect the leaching of antimony from the waste;t he release amount of antimony element is the largest under neutral pH conditio n of rain, and the release amount is lower under weak acid condition;With the rainfall time increasing,the release amount of antimony element takes a trend of increasing firstly,decreasing and then increasing again.The release mechanism of antimony is studied. Antimony leaching process is mainly the combination of p hysical erosion and chemical oxidation reaction.Release kinetics model and leach ing model of antimony are established to predict the annual releasing amount a nd the average release concentration in the stacking area.Based on the analysis of migration and transformation process of antimony at the soil-water interface,the following conclusions are obtained:the process ma inly includes the convection dispersion,leaching and soil adsorption,among which the most important way is the first one.Firstly,establish the transport and transf ormation model suitable for the soil-water interface in the antimony ore stackin g area,then use the Laplace transform to solve the model and calibrate the Seep age velocity μ and longitudinal dispersion coefficient D in the unsaturated soil seepage process under the influence of the retardation factor.Do soil column exp eriments based on the equation and fitting verification of the equation with the experimental data,and the correlation coefficient is 0.9715.The results show that the model can well simulate the migration and transformation process of antimo ny at soil-water interface in the antimony ore stacking area,providing a theoretic al basis for the study of antimony pollution in the regional environment.