1 Metal oxides, namely lithium oxide, sodium oxide, magnesium oxide, aluminium oxide, potassium oxide, calcium oxide, gallium oxide, indium oxide, tin oxide and lead oxide; oxides of transition metals, namely titanium oxide, vanadium oxide, chromium oxide, manganese oxide, iron oxide, cobalt oxide, nickel oxide, copper oxide, zinc oxide, niobium oxide, molybdenum oxide, ruthenium oxide, rhodium oxide, palladium oxide, silver oxide, cadmium oxide, iridium oxide, platinum oxide and gold oxide; lead oxide; metal citrates for industrial use, namely lithium citrate, sodium citrate, magnesium citrate, aluminium citrate, potassium citrate, calcium citrate, gallium citrate, indium citrate, tin citrate and lead citrate; citrates of transition metals for industrial use, namely titanium citrate, vanadium citrate, chromium citrate, manganese citrate, iron citrate, cobalt citrate, nickel citrate, copper citrate, zinc citrate, niobium citrate, molybdenum citrate, ruthenium citrate, rhodium citrate, palladium citrate, silver citrate, cadmium citrate, iridium citrate, platinum citrate and gold citrate; citric acid; industrial metal salts; industrial non-ferrous metal salts; industrial precious metal salts; industrial noble metal salts; industrial alkali metal salts; industrial transition metal salts; industrial lithium salts; lithium carbonate for industrial use; lithium sulphate for industrial use; lithium hydroxide for industrial use; chemical reagents for industrial recycling processes; chemical reagents for hydrometallurgical processing of waste