电解锰渣合成堇青石陶瓷及其烧结性能研究

Synthesis and Sintering Properties of Cordierite Ceramic Prepared by Electrolytic Manganese Residue

电解锰渣因含大量有毒物质而污染生态和环境。该文采用固相反应法,对锰渣、滑石、工业氧化铝、石英的混合坯块在1 140~1 220℃内进行烧结,研究产物的物相构成、烧结性能和组织结构。结果表明,锰渣的主要矿物相为20.9%石英和29%二水硫酸钙。1 210℃以上烧结才能合成堇青石为主晶相的陶瓷,堇青石呈长条状,形貌发育良好。1 140~1 200℃内随着烧结温度升高,样品的吸水率、气孔率快速减少,而密度和强度急剧增大;在1 200℃时具有2.213 g/cm^3的最大密度和70.6 MPa的最高强度;温度超过1 210℃时,样品因严重"过烧"而导致性能急剧下降。

Electrolytic manganese residue(EMR) highly pollutes the eco–environment due to involving a large number of poisonous substances. Using the solid phase reaction method, the mixed green compacts containing EMR, talc, industrial alumina and quartz are sintered at 1 140~1 220 ℃,and thus the phase compositions, sintering properties and microstructures of products are studied. It is found that, the mineral phase of EMR primarily consists of quartz(20.9%) and calcium sulphate dehydrate(29%). Only above 1 210 ℃ temperature, the cordierite ceramic as the main phase could be synthesized with the bar–likely and well–development. With the sintering temperature rising at 1 140~1 200 ℃, the water absorption and porosity of samples quickly lowed down, but the density and strength of those rapidly increased and reached the maximal values with density 2.213 g/cm^3 and strength 70.6 MPa at 1 200 ℃, respectively. However, once the temperature exceeded 1 210 ℃, the properties of sample greatly declined owing to the serious"overburning".