Study On Recycling And Utilization Of A Manganiferous By-Product For Discharge Raw Material Of Battery

In this paper, recycling and utilization of the manganiferous by-product generated in the hydrometallurgical process of Mn is studied, and a method for impurities removal is proposed on the basis on characteristic of a higher component of manganese dioxide. According to summary and analysis of relevant documents, theories and techniques, the effective method is obtained to recycle secondary manganese resources, and to reduce pollution and harm of the manganiferous materials to the environment. Experimental results have some practical meaning to re-use the by-product for raw materials of battery.Water pretreatment method can be used to firstly eliminate soluble impurities in the manganiferous by-product. Through research on the impact of dissolution yield and the content of manganese dioxide in experimental conditions of temperature, time and liquid-to-solid ratio, water pretreatment made 15.77% of dissolved impurities is eliminated and manganese dioxide content increases to 65.68%, to realize the load reduction in later process.Impurity of the manganiferous by-product can be removed by using dilute sulfuric acid for increasing the content of manganese dioxide. Under the condition of liquid-to-solid ratio 4:1, temperature 80℃, concentration of sulfuric acid 1.0 mol·L^-1 and time 3.0h, dissolution yield is up to 74.02%, manganese dioxide content is increased from 65.68% to 71.52%, with discharge time expanding to 260 min. Through study on XRD and differential thermal analysis, development of manganese dioxide crystallization of the acid leaching sample is incomplete, and colloidal structure that is disadvantageous to discharge performance of the manganese dioxide is discovered. Roasting modification can optimize crystal structure and colloidal structure. Under the condition of temperature 350℃and time 1.0h, discharge time of the sample can be expanded to 305min. Moreover, roasting modified by the addition of sodium carbonate can stabilize manganese dioxide crystal structure. When 6% addition of sodium carbonate is mixed with the sample during roasting, the discharge time of the product can be more prolonged for about 20min.At last, by using ultrasonic energy, ultrasonic activation can clean up the impurity, and refine the sample. Component of manganese dioxide is up to 73.52%, and the discharge time can be prolonged to 330min.Through research on acid leaching - roasting modification method, an effective technology is obtained to recycle and to re-used the secondary manganese resources.