Physicochemical and commercial properties of a microelement-containing nitrogen fertilizer based on ammonium nitrate and spent lithium-ion batteries

The results of a comprehensive study of the physicochemical and commercial properties (hygroscopic point, sorption kinetics, sorption moisture capacity) of trace-containing nitrogen fertilizers based on ammonium nitrate (AN) melt and cathode powder from used lithium-ion batteries are presented. The use of cathode powder as a polymicroelement additive (PMА) is shown, and they were introduced into the saltpeter melt at various mass ratios of NА: PMА from 100 (0.5-3.0). The prepared samples of fertilizers with a granule size of 2-3 mm were tested to determine the hygroscopic point, sorption kinetics, and sorption moisture capacity at relative air humidity of 60, 70, 85, and 100%. The samples of fertilizers were studied at a relative humidity of 60%, and it was proved that at such a relative humidity, the samples do not get moistened, but rather dry out. The results of the study of samples with a 4-hour exposure are given and it is found that fertilizer granules have a low hygroscopic point from 50 to 60% and a high moisture absorption rate in the order of 1.860; 5.920 and 6.710; 2.052; 6.790 and 9.451, as well as 3.481; 6.954 and 9.906 mg/(g min) at relative air humidity of 70, 85 and 100%, respectively. Due to the fact that the process of sorption of the investigated granules of products lasts up to 30 days (or 720 hours), they have a hygroscopic point of 60 to 70%, related to hygroscopic substances. Appropriate conclusions are drawn due to the properties of the studied fertilizers: they have a low moisture capacity, and their physical properties begin to deteriorate sharply only at a moisture content of about 2%. The resulting fertilizers are not inferior to known fertilizers in their characteristics. Recommendations are given for packaging the finished product in plastic bags for storage and transportation over long distances.

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