INCREASING THE CONCENTRATION OF SnO2 IN TIN SLAG USING LEACHING METHOD BY ACID

• Main Author: (NIM: 20514006), HANEFIATNI
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/20150
• Institution: Institut Teknologi Bandung

Slag is a by-product from the processing of tin ore or waste from the smelter. The content of the tin slag can be SnO2, Nb2O5, Ta2O5, SiO2, Al2O3, Fe2O3, CaO, TiO2, MnO, and others with varying concentrations depending on the origin of tin ore. The existence of slag as waste normally accumulate and quite bulky for storage. In addition, the content of heavy metals in the slag of lead can be harmful to the environment because of the heavy metals may be released into the environment can be through a process of dissolution/leaching of metals into soil/water mainly by rainwater containing acidic. Utilization and tin slag processing can be done by increasing the concentration of lead in the slag so that the slag can be processed in the smelter. Increasing the concentration of lead in tin slag were conducted in this study is the method of leaching. Experimental research aim to find the best parameter that can be used to increase the concentration of lead in the slag seen from the concentration ratio of tin to other compounds in the tin as measured by XRay Flouresence (XRF). Variation parameters that do are variations substance leachant, variations in the concentration of leachant, slag and volume ratio variation leachant, leaching time variation, and the effect of adding a surfactant. Measurements by XRF showed that the leaching process can increase the concentration of lead in the slag. The best conditions in the leaching process 10 grams of slag obtained with substances leachant 0.7 M HCl solution of 80 mL with a contact time of 30 minutes. In these conditions the comparative figures SnO2/Al2O3 increased from 1.74 to 2.08; comparative figures SnO2/SiO2 increased from 0.66 to 0.73; comparative figures SnO2/CaO increased from 1.68 to 2.12; comparative figures SnO2/TiO2 increased from 2.38 to 2.74; and the comparative figures SnO2/ Fe2O3 increased from 1.09 to 1.19. This research also studied the effect of the addition of the surfactant Sodium Dodecyl Sulfate (SDS). The addition of 0.8 mM SDS at optimum leaching conditions which have been obtained can increase the comperative figure of SnO2 concentration as much as 14,14% of Al2O3; 8,45% of SiO2; 18,13% of CaO; 9,6% of TiO2; and 10,53% of Fe2O3.