Preparation And Performance Research Of Manganese Residue Glass-ceramics

A large amount of electrolytic manganese residue will be generated in the production process of electrolytic metal manganese.Electrolytic manganese residue is mainly handled by damming and storage.Manganese residue contains harmful elements such as N,Mn,Cr,Cu,etc.,under the leaching of rainwater,the harmful elements enter water and soil,which not only pollute the environment,but also pose a potential threat to human health.The accumulating electrolytic manganese residue will also put pressure on the enterprises.Therefore,how to deal with and utilize effectively electrolytic manganese residue is an urgent problem to be solved in the current electrolytic manganese industry.Using the calcined electrolytic manganese residue as the experimental raw material,sintering and melting methods are used to prepare glass-ceramics,and the process conditions are optimized.At the same time,the effects of heat treatment,nucleating agent and glass powder size on the mechanical properties,phase composition,micro-morphology,acid and alkali resistance of glass-ceramics were studied.XRD,DSC,SEM,EDS and other means were used to characterize the properties of the samples.And the mechanical properties,acid and alkali resistance of the samples were tested according to the corresponding national standards.Both the sintering method and the melting method can prepare samples with excellent properties,and the main crystal phases of the prepared samples are all pyroxene crystal phases.Using the calcined electrolytic manganese residue as the experimental raw material,manganese residue glass-ceramics are prepared by sintering method and the utilization rate of manganese residue can reach 100%.For the sintering method,the nucleation temperature,crystallization temperature and particle size of the glass powder are important factors affecting the performance of glass-ceramics.The crystallization activation energy of manganese residue glass powder calculated by Kissinger and Ozawa methods is 276.23KJ/mol and 295.82 KJ/mol,respectively.When the glass powder passed 240 mesh,the nucleation temperature is 800?,the heat preservation is 0.5 h,the crystallization temperature is 1050?,and the heat preservation is 1h,that is 800?/0.5h+1050?/1h,the comprehensive properties of the sample are the best.Bending strength the sample is 125.05MPa,volume density is 2.82 g/cm~3,water absorption is 0.05%,K value of acid resistance is 99.42%,and K value of alkali resistance is 99.86%.When D50 of the glass powder is9.829?m,the composite properties of the glass-ceramics prepared under the heat treatment conditions of 800?/0.5h+940?/1h are the best compared with samples of other particle sizes.And bulk density of the sample is 2.90 g/cm~3,water absorption is 0.11%,bending strength is 123.43 MPa.The glass-ceramics are prepared by the melting method,and utilization rate of manganese residue is more than 95%.The experiment proves that the chromium-containing oxide can effectively promote nucleation and crystallization of the manganese residue glass powder.The electrolytic manganese residue was added with 2wt%chromium dioxide,and the one-step heat treatment was adopted.Different heat treatment temperatures will significantly affect the crystallinity and performance of sample.When the heat treatment temperature is 950?,the sample has the highest crystallinity and the best comprehensive performance.Bulk density of the sample is 3.08 g/cm~3,water absorption rate is 0.02%,and bending strength is 133.55 MPa.Using the calcined electrolytic manganese residue to prepare glass-ceramics has high utilization rate(?95%)and large consumption.It can not only solve a large number of electrolytic manganese residue and avoid environmental pollution,but also bring economic benefits.In addition,there are few reports on the preparation of glass-ceramics with electrolytic manganese residue.The relevant experiments and discussions of this subject also provide experimental and theoretical reference for the preparation of glass-ceramics with electrolytic manganese residue.