利用镍铁渣及粉煤灰制备CMSA系微晶玻璃的研究

Research of Preparing CMSA Glass-ceramics with the Nickel Iron Slag and Fly Ash

铁合金渣数量多,利用率低,已经成为制约铁合金行业可持续发展的重要因素。为了拓宽铁合金渣新的利用途径,本文以镍铁渣为主要原料,协同利用粉煤灰制备了Ca O-Mg O-Al2O3-Si O2(CMAS)系微晶玻璃。试验结果表明,完全利用镍铁渣和粉煤灰两种固废能够制备出性能良好的微晶玻璃。随着镍铁渣掺量从40%增加到55%时,微晶玻璃最佳成核、晶化温度变化不明显,但其抗折强度从66 MPa增加到87 MPa,相应体积密度增大3%,收缩率增大15%,吸水率降低95%。当镍铁渣掺量增加时,微晶玻璃中钙长石和顽辉石相对含量随着增大,而石英和尖晶石相对含量减少。晶相变化和微观结构致密性增加是导致微晶玻璃性能变化的一个主要原因。当镍铁渣掺量为55wt%,粉煤灰掺量为45wt%时,所制备的微晶玻璃抗弯强度为86.76 MPa,吸水率为0.09%,析出的主晶相为钙长石和顽辉石,辅晶相为尖晶石。

The large quantity and low efficiency of utilization of the ferroalloy slag has become an important factor that constrains the sustainable development of ferroalloy industry. In order to broaden the new utilization way of ferroalloy slag,the thesis introduces the experiment of preparing glass-ceramics,which uses nickel iron slag as the main ingredient and fly ash as the minor ingredient. The result of the experiment indicates that totally making use of nickel iron slag and fly ash can prepare microcrystalline glass,which with good performance. As the increase of mixing amount of nickel iron slag from 40% to55%,the change of the best nucleation and crystallization temperature is not obvious,Meanwhile,the flexural strength increases from 66 MPa to 87 MPa,the volume density increases by 3%,shrinking rate increases by 15%,the water absorption rate decreases by 95%. With the increase of mixing amount of nickel iron slag,the glass-ceramic crystalline phase are mainly composed of anorthite and enstatite whose relative amount increase gradually,while the relative amount of the auxiliary glass-ceramic crystalline phase,quartz and spinel,decrease gradually. Phase change and microstructure density increase is a major cause of the performance change. When the mixing amount of nickel iron slag stands at 55wt% andthe fly ash at 45wt%,the flexural strength of the glass-ceramics is at 86. 76 MPa and the water absorption rate is 0. 09%. The main crystalline phase of precipitation are anorthite and enstatite,and the auxiliary crystalline phase is spinel.