There is a problem of low manganese leaching efficiency in the treatment of high-phosphorus and low-grade rhodochrosite by ammonia leaching. In this work, a proven and effective method was proposed to improve the manganese leaching efficiency by adding complexant during ammonia leaching of high-phosphorus and low-grade rhodochrosite. The thermodynamics of leaching process of rhodochrosite calcine after adding citric acid (CA), ethylenediaminetetraacetic acid (EDTA), nitrilotriacetic acid (NTA), glycine (Gly) different complexants were analyzed, and the effects of complexants on the manganese leaching efficiency were studied experimentally. Thermodynamic analysis and experimental results indicated that the four complexants can improve the leaching efficiency of manganese to varying degrees, and addition the EDTA has the best effect on improving the leaching efficiency of manganese. Moreover, various leaching parameters when EDTA was added and the effect of adding EDTA on ammonia evaporation product were further studied. The leaching optimum technology of rhodochrosite calcine with EDTA was obtained. Under the optimum technology, the manganese leaching efficiency increased to 90.1%. The addition of EDTA in the leaching process did not affect the ammonia evaporation product, and MnCO₃ product with 43.26% manganese content were obtained after evaporating ammonia.

氨浸处理高磷低品位菱锰矿存在锰浸出效率低的问题。本工作提出了一种行之有效的方法，即在高磷低品位菱锰矿氨浸过程中添加络合剂来提高锰浸出效率。分析了菱锰矿煅烧加入柠檬酸（CA）、乙二胺四乙酸（EDTA）、次氮基三乙酸（NTA）、甘氨酸（Gly）不同络合剂后浸出过程的热力学，并实验研究了络合剂对锰浸出率的影响。 . 热力学分析和实验结果表明，四种络合剂都能不同程度地提高锰的浸出效率，另外EDTA对提高锰的浸出效率效果最好。此外，进一步研究了添加EDTA时的各种浸出参数以及添加EDTA对氨蒸发产物的影响。得到了菱锰矿煅烧EDTA浸出的最佳工艺。在优化工艺下，锰的浸出效率提高到90.1%。浸出过程中添加 EDTA 不影响氨蒸发产物，而 MnCO蒸氨后得到锰含量为43.26%的_3产品。