硅锰渣一步法制备微晶铸石的热处理工艺及性能

Heat Treatment Process Optimization of Microcrystalline Cast Stone from Silico-manganese Slag by One-Step Preparation

硅锰渣是硅锰合金生产中产生的主要固废,对环境产生巨大威胁,现行处理工艺消纳能力有限,亟需探索新的处置方法。以硅锰渣为原料、不外加成核剂,采用Petrurgic烧成法制备硅锰渣微晶铸石,讨论了晶化温度、晶化时间对成品物相组成及性能的影响规律,从而得到最佳热处理制度。结果表明:将热熔渣冷却至950℃保温60 min和760℃退火处理,能够制备出性能优良的微晶铸石。所得微晶铸石结构致密,析出的晶相主要为辉石族矿物,包括透辉石和铝透辉石,其次是钙长石和硅灰石,具有较好的综合性能,其体积密度可达3.11×10^(3) kg·m^(-3),显微硬度达8.77×10^(3) MPa,抗折强度和抗压强度分别为86 MPa和222.9 MPa。

Silico-manganese slag is a main solid waste produced from production of silicon-manganese alloy,which affects the environment.It is thus necessary to explore the corresponding disposal methods since the exsiting processing technology restricts the absorbing capacity.A microcrystalline cast stone was fabricated by the Petrurgic firing method with silico-manganese slag as a raw material.The bulk density,microhardness,flexural and compressive strength of the samples were determined.The influences of crystallization temperature and time on the phase structure and properties of the finished product were invesigated.The results show that a hot molten slag is cooled to 950℃for 60 min and then annealed at 760℃,obtaing a microcrystalline cast stone with the superior properties.The microcrystalline cast stone has a compact structure,and the precipitated crystal phases are mainly clinopyroxene,diopside and aluminum diopside,as well as anorthite and wollastonite.The bulk density of the cast stone can reach 3.11×10^(3) kg·m^(-3),the microhardness is 8.77×10^(3) MPa,and the flexural strength and the compressive strength are 86 MPa and 222.9 MPa,respectively.