The Microemulsion Extraction Of Heavy Metals From Smelting Slag

This topic researchs the extraction and separation of copper,nickel and cobalt fromAcid dipping of slag, and inspection factors of the test.Firstly,The prepared microemulsion system for copper is composed ofTritonX-100, n-butyl alcohol, n-heptane, water, P507and sodiumhydroxide.Firstly,Triton X-100microemulsion was prepared with compositions ofTritonX-100,n-butyl alcohol,n-heptane and water by volume at an optimal ratio of0.4:18.5:0.5:0.5,which was then used to prepare microemulsion system for separatingcopper from cobalt and nickel by adding P507and sodium hudroxide solution byvolume at an optimized ratio of20:0.4:0.4,with concentration of sodium hydroxide at1.9mol/L,the pH value of external phase at3.5, the ratio of microemulsion to externalphase being1:4,NaCl dosage of0.5g(external phase20mL),with water bath kept at atemperature of60℃. After3-min extraction,the extraction rate of copper reached up to92.63%,while only14.06%and9.86%for cobalt and nickel, respectively,resulting incopper separation from cobalt and nickel.Secondly, The separation of cobalt and nickel by the microemulsion system ofoleate,the microemulsion system of Triton X-100,the microemulsion system of P507and P204have been studied. The prepared microemulsion system for cobalt iscomposed of TritonX-100, n-butyl alcohol, n-heptane, water, P204and sodiumhydroxide.Firstly,Triton X-100microemulsion was prepared with compositions ofTritonX-100,n-butyl alcohol,n-heptane and water by volume at an optimal ratio of2:44.5:2:1.5,which was then used to prepare microemulsion system for separatingcopper from cobalt and nickel by adding P204and sodium hudroxide solution byvolume at an optimized ratio of47：1：2,with concentration of sodium hydroxide at1.6mol/L,the pH value of external phase at2.1, the ratio of microemulsion to externalphase being1:3.5, the external phase NaSCN concentration of1.7mol/L,with waterbath kept at a temperature of50℃. After5-min extraction,the extraction rate of cobaltreached up to87.4%,while only10.87%for nickel, respectively, the effect issatisfactory. Lastly, The extraction separation of smelting slag of actual samples by wehave obtained the microemulsion. The experimental results show the extraction rate ofcopper was92.45%, that of nickel was12.3%, that of nickel was16.1%, the extractionrate of the copper after secondary extraction.The experimental results show theextraction rate of cobalt was86.63%, that of nickel was only10.04%, the separationfactor is55.8.the extraction rate of the cobalt and nickel after secondary extraction.