No abstract

This Project deals with the experimental results of the leaching of metal like Cu and Sn from Printed Circuit Boards (PCB) from obsolete electronic devices by means of leaching using different combinations of acidic mixtures followed by precipitation. Printed circuit boards were dismantled, cut into small pieces, and fed into a Ball mill. The powder obtained was leached by using the aqueous solutions H 2 SO 4 , H 2 SO 4 +HCl, HCl, and HCl+HNO 3. The lowest values for the percentage of metal extraction were obtained with H 2 SO 4 while the HCl+HNO 3 mixture exhibited an extraction of Sn and Cu in a maximum percentage. Precipitates were obtained at different pH values by neutralizing the leach liquors using NaOH. The HCl+HNO 3 leach system presented the highest recovery values from the powder feed as well as from the leach liquor. Comparing the results for Sn and Cu extraction after 120 minutes obtained with the various leach systems, 3.0 N HCl+1.0 N HNO 3 exhibited the highest percentage values for simultaneous Sn and Cu extraction (93.3%Sn and 92.7% Cu).

The aim of this project is to segregate the fiber from agricultural waste in three distinct stages such as alkali treatment, bleaching process, acid hydrolysis. Agricultural wastes such as cassava bagasse, sorghum stalk, corn stalk were selected. Initially the raw materials were subjected to chemical processes like alkali treatment and bleaching process to remove lignin and hemi cellulose. The chemically purified cellulose was then subjected to acid hydrolysis for isolation of fiber. Characterization of FTIR result shows that hemicellulose and lignin was partially eliminated. TGA was carried to know the thermal properties of the sample. The film was formed by casting method using isolated fiber, maize starch, agar, Tween 80. The fibers were incorporated into the film and their properties such as tensile strength, moisture content and solubility were studied