磷矿石尾矿配料的易烧性试验研究

Experimental investigation on burnability of phosphate rock tailings ingredient

通过磷矿石尾矿的易烧性试验,可以发现在煅烧温度低于1350℃时,生料中掺加磷矿石尾矿对生料的易烧性改善不大,且随着生料中尾矿掺加量的提高,熟料中的游离氧化钙含量也在逐步增加。但是在1400℃和1450℃时,由于熟料中液相的出现,P2O5快速降低了液相黏度,促进了C3S的快速形成;同时在冷却阶段能够维持C2S在较高的晶型,提高熟料的后期强度。因此在使用磷矿石尾矿做矿化剂时,并不能降低熟料的烧成温度,但是可以明显增加液相量,降低液相黏度,至于对熟料强度的影响尚需进一步试验的验证。

Through burnability experiment of phosphate ore tailings, it is found that when the firing temperature is below 1350 ℃, the burnability of raw meal can hardly be improved by adding phosphate ore tailings, and with the adding of railings, value of w （f-CaO） in clinker increases. But at 1400 ℃ and 1450 ℃, as the emergence of liquid phase,the liquid viscosity is decreased quickly by P2O5 which promotes fast formation of C3S, and at the same time,C2S is maintained a higher crystal in the cooling stage which benefits a higher later strength. So using phosphate ore tailings as mineralizer cann＇t decrease the firing temperature of clinker but can increase the liquid volume and decrease liquid viscosity, as for the impact on clinker streghth, it needs luther testing verification.