Processes for production of micronutrients from spent alkaline batteries

A process for processing a black mass of spent alkaline batteries, comprising:

• selectively pre-processing the alkaline black mass, including at least one of heat treating, crushing, magnetically separating ferrous metals, washing to removing non-metallic coarse materials and grinding an already heat treated black mass;
• leaching the selectively pre-processed alkaline black mass in an acidic solution to produce a leach solution;
• and
• removing from the leach solution one or more heavy metals by a cementation operation by applying at least one non-noble metal in a metal form and one or more additional cementation agents from both sulphate and nitrate groups as cementation agents to process the leach solution into one or more products of at least manganese- and zinc-containing sulphate solution which is suitable for use as micronutrients alone, in fertilizers and/or together with a plant protective agent.