Analytical Control of Secondary Lead Containing Raw Materials
Analytical control of chemical composition of secondary lead-containing raw materials (battery scrap) is presented. Features of sample digestion are studied for active mass and metal fraction of the battery scrap with allowance for disolution of lead oxides, sulfates and sulfides, as well as antimony, copper, and iron impurities. Currently, there are no standard methods for determination of the content of lead, metal impurities and sulfur in the secondary lead-containing raw materials. To close the gap we have improved and refined standard gravimetric and titrimetric methods as applied to secondary lead-containing raw materials, metal impurities (Sb, Sn, Bi, Cu, Fe) and sulfur in the samples of metal fraction and active composition, obtained upon cutting and sorting of lead-containing batteries. Methods of mathematical statistics are used in data processing. Analitical expressions derived to calculate the content of lead, metal impurities and sulfur may be recommended for use in control of elemental composion in metallurgical processing of secondary lead raw materials, as well as in treatment of sewage and industrial wastewater.