Metal Recovery with Algae

1. 藻类对金、银、钴离子的吸附和洗脱pH = 6时，藻类对钴离子的吸附率较高，pH = 2时吸附率较低。pH = 2时洗脱的钴离子分数高，pH = 6时洗脱的钴离子分数低。pH = 2时吸附的金离子分数较高，pH = 6时吸附的金离子分数较低。海带藻（LS）、褐藻（UN）、水蛭eisenia byciclis （EB）和马尾藻（ST）对钴的吸附量较大，小球藻（CV）和螺旋藻（SP）对金的吸附量较大。铂和钯的吸附藻类对铂和钯的吸附类似于对金的吸附。在pH = 6时，吸附的稀土离子（sm、Nd、Y、La或Ga）的吸附量较高，在pH = 2时吸附量较低。当pH约为4时，SP的吸附率最高。Sm和Co的分离是可能的。对砷的吸附当溶液为酸性时，砷的吸附分数较高。镉的吸附藻类对镉的吸附类似于对钴的吸附。柱状藻层对金属离子的连续吸附采用恒流泵向柱状藻层输送氯化金水溶液，实现了对金的连续吸附。在藻液比相同的情况下，连续吸附法与间歇吸附法对金的吸附水平基本相同。

1. Adsorption and elution of gold, silver or cobalt ion with algaeCobalt ion fraction adsorbed by algae is high when pH is 6, and low when pH is 2. Cobalt ion fraction eluted is high when pH is 2, and low when pH is 6. Gold ion fraction adsorbed is high when pH is 2, and low when PH is 6. Cobalt adsorption capacity by laminaria species (LS), undaria (UN), eisenia byciclis (EB) and sargassum thumbergii (ST) is large, and gold adsorption capacity by chlorella (CV) and spirulina (SP) is large.2. Adsorption of platinum and palladiumAdsorption of platinum and palladiumn by algae resembles to that of gold.3. Adsorption of rare earthSm, Nd, Y, La or Ga ion fraction adsorbed is high when pH is 6 and low when pH is 2. But those fraction adsorbed by SP is highest when pH is about 4. Separation of Sm and Co is possible.4. Adsorption of arsenicArsenic fraction adsorbed is high when the solution is acidic.5. Adsorption of cadmiumAdsorption of cadmium by algae resembles to that of cobalt.6. Continuous adsorption of metal ion by algae layer in columnContinuous adsorption of gold was done by feeding the auric chloride aqueous solution to algae layer in column by constant-flow-pump. Gold fraction adsorbed by continuous adsorption was almost the same level to that by batch adsorption when the algae/solution ratio was the same.