Yunnan Xuanwei High Phosphorus Refractory Low Manganese Pyrolusite To Lowering Phosphorus Mentioning Manganese Research

Manganese ore is an important strategic mineral resources in China, and has been listed as a scarce mineral. The high-quality rich manganese mineral resources are becoming scarce, and the mineral resources reserves proportion with features of poor fine and miscellaneous are becoming increasing. In order to meet the industrial needs of high- quality manganese ore for China's development, China has to import a large of high-quality rich manganese ore from abroad. For this reason, these refractory high-phosphorus large reserves manganese ore, such as Xuanwei manganese ore, must be exploited and use for industry to reduce the dependence on foreign high-quality manganese resources and the procurement cost.Manganese grade of Xuanwei ore with fine particle size distribution and high phosphorus is low. Phosphorus and manganese distribute In different particle sizes. The ore exists isomorphism structure of phosphorus, manganese. In order to make Xuanwei pyrolusite getting beneficiation requirements, the following jobs were carried out:(1)Through the magnetic microwave roasting and strong magnetic separation process, shaking table process, the acid direct leaching process, microwave roasting and leaching process, the test results show that those processes are not suitable for the manganese ore selection with high P/Mn ratio. It can not meet the YB/T 319-2005 national industry standards for metallurgical manganese ore(2)This paper presents the mixing acid curing process to deal with the high phosphorus low manganese. Through thermodynamics analysis, manganese dioxide is hard to react with nitric acid and sulfuric, and the process is feasible. Manganese concentrates with low P/Mn ratio and high grade can be obtained. The effect of dephosphorization and beneficiation is significant. In the process, the effects of the solid-liquid ratio, ore size distribution, time and temperature for the P/Mn ratio and manganese grade were studied, and solid-liquid ratio, particle size were the main factors. (3)The mixed acid curing process parameters were optimizated:-0.125+0.1 mm ore particle size, solid-liquid ratio of 1:1, curing time 1h. A manganese concentrate was obtain by the check experiment. The grade of Mn increased from 11.56% to 44.08% with the P/Mn ratio decreasing from 0.0126 to 0.0059, and the manganese recovery rate was high to 93.28%, meeting the qualification of AMn45Ⅲmetallurgical manganese ore.(4)Because the process gets aggregate mixing acid, kinetic process can be explained with large particles with pore leaching model. Nitric acid was used to improve concentration gradient of reactants, intensifying leaching phosphorus process. It has be found that the reaction rate controlling-step is controlled by diffusion in the mixing acid curing process. The influence of temperature on the reaction rate is not significant in the process. The particle size and solid-liquid ratio play an important role in the process for dephosphorization and beneficiation.(5)The amplification experiment was carried out using 1 kg material with the optimized process parameters in laboratory scale. Through the tests,it has been found that the incomplete reaction problem can be effectively solved by mixing an appropriate amount of water to improve liquid-solid ratio with the same amount of acid. When the liquid-solid ratio was improved to 1.5:1, a manganese concentrate was obtianed with manganese grade 43.32%, P/Mn ratio of 0.006 and 90.45% manganese recovery. And it meets the standards of AMn42Ⅲfor metallurgical grade manganese ore.Today, the poor, fine, complex refractory ore resources are growing proportion. A simple mechanical or chemical beneficiation process will be difficult to deal with such refractory ores. It has become very important to develop a new beneficiation process. This paper offers a new idea for similar refractory high-phosphorus low-manganese ores.