Method of manufacture of type 4A zeolites adsorbents spheres via Sol gel process suitable for the adsorption and capture of heavy metals present at low concentrations in large volumes of effluents of industrial lu00ecquidos

摘要

Method of manufacture of type 4A zeolites adsorbents spheres via Sol gel process suitable for the adsorption and capture of heavy metals present at low concentrations in large volumes of effluents lu00ecquidos industrial.The present invention relates to a method for the manufacture of ball type zeolites adsorbents 4a, which is based on the known process of sol gel to immobilize microparticles ( 243 38 109 m) of type 4A zeolites, preferably in phase in o.a1 ~ 2 ~ ~ 2 ~ ~ 3 ~.1,85sio ~ 2 ~.5,1h ~ 2 ~ in the spherical format and pasting them with molecules of polyvinyl alcohol (PVA) and nanoparticles of bohemita ( 244 - A1 ~ 2 ~ ~ 3 ~ H ~ 2 ~), these nanoparticles obtained with the aid of a reaction processing sol - gel at room temperature. Gaseous environment containing NH ~ 3 ~ and An aqueous medium containing NH ~ 4 ~ oh.The ball type 4A zeolites are obtained with high sphericity, mechanical strength greater than 2 kg / sphere, narrow diameter distribution, average diameter between 1 mm and 5 mm, with good chemical stability in means acidic, basic and neutral and with good ability to absorb w Without taking a swelling destructive.These spheres are appropriate for the alternative treatment of large volumes of industrial liquid waste containing low concentrations of heavy metals, especially for CD, Cu and Zn, since they can be produced industrially at low cost and with the following characteristics of ad The sorption of CD + Cu + Zn: removal efficiency more than 81%.The maximum capacity adsortiva 746 109 mo1 / g and the rate of adsorption 242 18.3 109 mo1 / G.H.