Difficult To Choose Low-grade Manganese Ore Leaching - Purification

On the basis of analysis and research of mineral and metallurgical technologies for treating the low-grade, high-iron, refractory manganese ore obtained from Xishuangbanna of Yunnan Province, China. The occurrence of manganese was identified in the sample. On the premise of increasing leaching recoveries of main metal as high as possible, realizing leaching recoveries of other metals and gangue minerals as low as possible, an extraction processing associated manganese from the ore is explored.The contents and occurrence of the manganese and iron was identified by the spectral analysis,main composition and chemical phases of the ore, the results show the composition of manganese and iron was 19.09% and 19.38% respectively, manganese in the ore was occurred as pyrolusite, manganite, braunite and rhodochrosite ect., and mainly occurred as pyrolusite and its contents and mass fractions is 10.15% and 84.46% respectively; hematite and limonite are the mainly exiting patterns of iron mineral; gangue minerals is quartz and silicate minerals mainly and small amounts of carbonatemineral.Analyzed the possibility and thermodynamic conditions of reducing leaching of pyrolusite according to the calculation results of Gibbs free energy and equilibrium constants on the condition of H2O2, which determined pyrolusite and sulfuric acid cannot be react; the reaction order of manganese and iron minerals is Mn2O3>MnO2>MnCO3 and Fe3O4>Fe2O3>FeCO3 respectively, and helper leaching agent can be not only achieved pyrolusite leaching as the reducing agent but also Fe2+oxidized to Fe3+ as the Oxidizing agent. Therefore, Hydrolysis and Neutralization method was used directly to remove iron from leaching solution without adding oxidants.This experiment which uses the low-grade refractory pyrolusite as a study object, chooses H2O2 as leaching agent. the manganese leaching ratio 97.95% was obtained under the optimum conditions of-0.074mm 80% grinding fineness, leaching temperature at 25℃for 2 hours, the mass fraction of H2O2 and H2SO4 of 0.39t/t and 0.75t/t respectively, the solid-to-liquid is 5:1 by single-factor test, orthogonal test and the analysis of experiment results.On the basis of exploratory study about the purification of lixivium, Fe3+ and Al3+ were removed by emulsified calcium carbonate under the condition of 25℃and 5.5-6.0 of the pH, and pH less than 6.43 was determined when heavy metal ions could be removed and the MnS could not change precipitation, in addition, delivering rate of Mg2+ and Ca2+ is 81.25% and 81.81% by concentrated static solution. In the end, leaching solution reached the requirement of electrolyte by the impurity.Manganese recovery of 88.97% was be obtained by leaching and impurity.