Research on the Extraction of Ga from the Sulfuric Acid Leaching Solution of Claystone of Coal-Aluminum Rock Series AITranslate

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Chinese Library Classification Number:O657.31[理学]

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To achieve efficient separation and recovery of Ga from sulfuric acid leaching solution of claystone of the coal-aluminum rock series,this study employed Seplite^®LSC-900 gallium-extraction chelating resin for adsorption-desorption experiments on a single Ga solution.The effects of solution pH,adsorption time,types and concentrations of desorbent,and desorption time on Ga adsorption-desorption efficiency were investigated.The microstructure of the resin before and after adsorption was characterized via SEMEDS.Meanwhile,FTIR was employed to analyze the adsorption mechanism of the resin for the sulfuric acid leaching solution of claystone of the coal-aluminum rock series.Additionally,under the optimized adsorption-desorption conditions,the separation efficiency of Ga from other impurity ions in the sulfuric acid leaching solution of claystone of the coal-aluminum rock series was explored.The results show that when the pH value of the single Ga solution is 4 and the adsorption time is 120 min,the Ga adsorption rate reaches approximately 80%.After adsorption,the cross-linked structure of the resin's strip-like fibers increases,and Ga embeds into the pore channels and induces an increase in surface roughness of the pore channels.The adsorption of Ga from the sulfuric acid leaching solution by the resin is attributed to the synergy between electrostatic interaction and chemical coordination.Specifically,the—OH and—NH2 functional groups generate electrostatic interactions with[Ga(SO₄)]⁺,while the O atoms in—OH form Ga—O coordination bonds with Ga.The optimal desorption effect of Ga is achieved when the saturated adsorption resin is eluted with 1.5 mol/L HCl for 1 h,with a desorption rate of about 80%.The results of adsorptiondesorption experiments on the sulfuric acid leaching solution of claystone of the coal-aluminum rock series indicate that LSC-900 gallium-extracting chelating resin exhibits excellent selective adsorption capacity for Ga and Zr.Furthermore,Ga can be almost completely desorbed whereas Zr is difficult to desorb,thus successfully achieving effective separation of Ga from other metal ions in the leaching solution.This study provides technical support for the efficient recovery of Ga from the leaching solution of claystone of the coal-aluminum rock series.