Agronomic efficiency of phosphate fertilizers produced by the re-use of a metallurgical acid residue

作者：Carneiro Barreto Matheus Sampaio; Mattiello Edson Marcio; Santos Wedisson Oliveira^*; Azevedo Melo Leonidas Carrijo; Vergutz Leonardus; Novais Roberto Ferreira

来源：Journal of Environmental Management, 2018, 208: 1-7.

DOI：10.1016/j.jenvman.2017.11.075

• Green chemistry
• Phosphate rock
• Recycling
• Re-use

The production of fertilizers with industrial wastes reduces the environmental impacts of waste disposal and improves environmental sustainability by generating added-value products. Our objective with this study was to evaluate the agronomic performance and potential soil/plant contamination with heavy metals of alternative phosphate (P) fertilizers, obtained from the acidulation of phosphate rocks (PR) by a metallurgical acidic waste. Seven P fertilizers were evaluated: three PR (Araxa, Patos, and Bayovar), their respective acidulated products (PAPR), and triple superphosphate fertilizer (TSP). A greenhouse trial was carried out to test the agronomic performances of fertilizers in a sequentially cultivated maize-soybean white oat. The reaction of PR with acid waste was effective to increase their solubility and improve plant yield and P uptake compared to their natural PR. There was a cumulative recovery by plants of 1.4 and 8.1% of added P via PR and PAPR, respectively. No increase in heavy metal (Cd, Pb, Cr, and Ni) availability in soil or accumulation in shoots was observed, indicating that the PAPR were environmentally safe. The usage of acid waste to produce P fertilizers therefore represents a strategic way to employ marginal products for the production of fertilizers.

• 出版日期2018-2-15