合成アルキルマロン酸ジナトリウムを用いた浮上分離

浮上分離法による重金属の除去

抄録

Three kinds of surface active agents as collectors for bubble separation were synthesized by malonic ester synthesis. They are di-sodium lauryl malonic acids, di-sodium hexadecyl malonic acid, and di-sodium stearyl malonic acid.
Generally, micelles are formed in a concentrated surface active agent aqueous solution. Although, it is said that micelles decrease collectabilities of collectors (surface active agents). Electro conductivities and CMC_s of the synthetic surface active agents were measured at 20°C in a constant temperature bath. These measurements were continued on same solutions for one week. One week later, the most concentrated solution of them were diluted into various concentrations. Then electro conductivities and CMC_s were measured. These values of fresh, of aging, and. of old solutions were not different. It is thought that micelles of these synthetic agents are dispersed quickly in dilute solution below CMC and that micelles do not disturb collectabilities of agents.
By using these synthetic surface active agents, bubble separation experiments were performed on heavy metal ions, cadmium, zinc, lead and nickel. Definite removal results were gotten by using of these synthesized agents respectively; LMD removed cadmium, zinc and nickel, HMD removed zinc, lead and nickel, and SMD removed zinc, lead and nickel effectively.
A simple bubble separation apparatus and a Kyodai flotation machine were used for the experiments. Better separation effects were shown by the Kyodai flotation machine than by the bubble separation apparatus.