苄基丙二酸的合成及捕收性能研究

在实验室成功合成了苄基丙二酸固体,并对其捕收性能进行了初步研究.结果表明,苄基丙二酸对方铅矿具有很强的捕收能力,在药剂用量很小和很宽的pH值范围内(pH=4~10),方铅矿回收率都在90%以上;对闪锌矿的捕收能力较强,回收率随pH值增大而逐渐减小;但对菱锌矿基本无捕收能力.产生这种现象的主要原因是,苄基丙二酸能与方铅矿表面的Pb发生O—O螯合,形成六元环螯合物,同时还伴随有分子和离子共吸附现象,而在闪锌矿表面仅发生分子吸附.

On the Synthesis and Catchability of Benzyl Malonic Acid

Solid-state benzyl malonic acid was synthesized in laboratory with its catchability studied preliminarily. Test results showed that the acid has highest catchability for galena in comparison with that for sphalerite and smithsonite, e.g., the recovery rate of galena is over 90% by use of a very small dose of the acid whose pH value is 4-10. Its catchability is efficient to a certain extent to sphalerite of which the recovery rate decreases gradually with increasing pH value, while basically it has no catchability for smithsonite. The main cause of such results is that the O-O chelation takes place between benzyl malonic acid and Pb on galena surface so as to form six-membered ring chelate with a co-absorption between galenite ions and molecule occurring at the same time, but on sphalerite surface only the molecule absorption occurs.