(淮陰工學(xué)院 生命科學(xué)與化學(xué)工程學(xué)院 江蘇省凹土資源利用重點(diǎn)實(shí)驗(yàn)室，淮安 223003)
摘 要: 利用Cu2+印跡凹土/殼聚糖復(fù)合材料(Cu2+ ions-imprinted attapulgite/chitosan composite materials，Cu2+-IICA)富集和純化低品位銅礦中的銅，將低品位銅礦粉碎后用1 moL/L鹽酸攪拌浸泡24 h，浸出液中銅用Cu2+-IICA進(jìn)行分離和純化，采用單因素實(shí)驗(yàn)設(shè)計(jì)法優(yōu)化篩選Cu2+-IICA純化銅的最佳靜態(tài)吸附-解析和動態(tài)吸附-解析工藝條件。結(jié)果表明，Cu2+-IICA純化銅的靜態(tài)吸附-解析最佳條件為Cu2+的初始濃度20.00 mg/mL、吸附溫度25 ℃、pH值5.0，解析液6% HNO3(質(zhì)量分?jǐn)?shù))溶液；動態(tài)吸附-解析最佳條件為上樣液流速40.0 mL/h、上樣液體積60.0 mL、解析劑用量150 mL、解析劑流速60.0 mL/h。在最優(yōu)條件下Cu2+-IICA對銅具有良好的選擇性和吸附性能，礦石經(jīng)Cu2+-IICA分離純化后，銅含量由純化前的8.06%增大到純化后的92.78%，提高了11.5倍。
關(guān)鍵字: 凹土；殼聚糖；離子印跡；低品位銅礦；純化
（Key Laboratory for Palygorskite Science and Applied Technology of Jiangsu Province,
School of Life Science and Chemical Engineering, Huaiyin Institute of Technology, Huai’an 223003, China）
Abstract:The enrichment and purification of copper from acid leaching solution of low grade copper ore by Cu2+ ions-imprinted attapulgite/chitosan composite materials (Cu2+-IICA) were studied. The copper ore was soaked by 1 moL/L HCl for 24 h, and single factor test method was used to optimize the technological conditions of enrichment and the purification of copper by static and dynamic adsorption-desorption experiments. The results show that the optimum technological conditions of static adsorption-desorption experiments are as follows: the initial concentration of Cu2+ is 20.00 mg/mL, adsorption temperature is 25 ℃, pH value is 5.0, and eluent solution is 6% HNO3 (mass fraction) solution. The optimum technological conditions of dynamic adsorption-desorption experiments are as follows: the flow rate of sample solutions is 40.0 mL/h, the sample volume is 60.0 mL, the flow rate and the dosage of eluent solutions are 60.0 mL/h and 150 mL, respectively. Cu2+-IICA has good selectivity and adsorption properties to copper under the optimal conditions, and the copper content increases from 8.06% to 92.78% after purification, increased by as much as 11.5 times.
Key words: attapulgite; chitosan; ions-imprinted; low grade copper ores; purification
