摘要
广西某铝土矿浸出循环母液中富含镓、钒,为给镓的分离、回收工艺研究提供依据,研究了偕胺肟螯合树脂吸附镓、钒、铝的规律和盐酸解吸的规律。结果表明:①偕胺肟螯合树脂对镓具有较高选择性,对铝的吸附率非常低;吸附温度对树脂吸附镓、铝的影响较小,对吸附钒影响较大,钒吸附率随温度升高而增大;树脂对镓的吸附速率比钒快很多;该吸附过程符合准二级动力学模型和颗粒扩散模型;镓的最优吸附条件为吸附温度25℃,吸附时间60 min。②在25℃情况下较低浓度的盐酸就能高效、快速解吸偕胺肟螯合树脂吸附的镓、铝,且受解吸温度的影响较小,钒难以解吸;提高盐酸浓度和解吸温度,盐酸对钒的解吸率明显上升;镓的最优解吸条件为盐酸浓度1.0 mol/L,解吸温度25℃,解吸时间5 min。③由于偕胺肟螯合树脂对铝土矿浸出循环母液中镓和钒的吸附率较高,且钒解吸困难,影响树脂的再生和循环利用。为了高效、低成本分离、回收镓,需在树脂吸附镓之前先采用氢氧化钠沉淀并回收原液中的钒,以尽量降低溶液的钒含量。
In order to provide basis for separation and recovery of gallium in bauxite leaching mother liquor,the principles of adsorption by amidoxime chelating resin toward Ga,V and Al,and desorption by hydrochloric acid were studied. Results are as follows:① amidoxime chelating resin has high selectivity for gallium,and the adsorption rate of aluminum was very low;the temperature had little effect on the adsorption of gallium and aluminum,and had great effect on the adsorption of vanadium. Adsorption rate of vanadium increased with temperature. Adsorption rate of gallium was faster than that of vanadium. Gallium adsorption is in accordance with quasi-second-order kinetics and particle internal diffusion model. The optimum adsorption conditions of gallium is: the adsorption temperature 25 ℃,the adsorption time for 60 min.② Under the condition of 25 ℃ and low concentration hydrochloric acid,the desorption rate of gallium and aluminum adsorbed by amidoxime chelating resin is high,the desorption speed is fast,and the desorption rate is less affected by the desorption temperature,and the vanadium is difficult to adsorb. When the concentration of hydrochloric acid and temperature increased,the desorption rate of vanadium showed an increasing trend. The optimum desorption conditions of gallium is: hydrochloric acid concentration 1.0 mol/L,the desorption temperature is 25 ℃,and the desorption time is 5 min.③ Due to the adsorption rate of gallium and vanadium in bauxite leaching mother liquor by amidoxime chelating resin is higher,and the desorption of vanadium is difficult,which affects the regeneration and recycling of resin. In order to separate and recover gallium efficiently and cheaply,it is necessary to reduce the vanadium content of the solution by adding NaOH to form sediment as much as possible before the resin adsorbs gallium.
作者
郑琦
韦悦周
何春林
吴静
戴蔚
Zheng Qi;Wei Yuezhou;He Chunlin;Wu Jing;Dai Wei(School of Resources,Environment and Materials,Guangxi University,Nanning 530004,China;School of Nuclear Science and Engineering,Shanghai Jiao Tong University,shanghai 200240,China;Guangxi Kev Liboratorv of Processingfor Non-ferrous Metal and Featured Materials,Nanning 530004,China;Land Management Center oj Department of Lindand Resources of Guangxi,Nanning 530004,China)
出处
《金属矿山》
CAS
北大核心
2019年第3期111-115,共5页
Metal Mine
基金
广西科技重大专项(编号:桂科AA17204100)
关键词
偕胺肟螯合树脂
镓
吸附
解吸
Amidoxime chelating resin
Gallium
Adsorption
Desorption
