黄磷炉渣热态成型资源化过程的二次污染预测

Secondary pollution prediction of recycling process of yellow phosphorus slag by moulding under thermal state

为研究黄磷炉渣热态成型资源化利用过程中所产生的二次污染,分析黄磷水淬渣的化学组成,采用黄磷炉渣分别制备多孔陶瓷和微晶玻璃,并利用热力学软件Fcat Sage6.1计算体系中含有的有害组分S,As,F和P达到热力学平衡时的状态。研究结果表明:制备多孔陶瓷时,原料中各有害气态污染物的释放量随温度的升高而逐渐增加,当温度分别达到900℃和300℃后,含S和As气态污染物的浓度增加已不再明显;在制备微晶玻璃的过程中,各有害气态污染物释放的初始温度与制备多孔陶瓷时的温度不同,但气态污染物的释放规律却一致。当多孔陶瓷和微晶玻璃的制备温度分别达到1 200℃和1 400℃时,体系中的S全部进入气相,并以SO2或SO2与SO3混合物的形态存在,85%以上的As进入气相并以气态As F3的形态存在,仅有不到4%的F进入气相形成气态Si F4,所有P形成熔融态的Ca3(PO4)2。

In order to investigate the secondary pollution from the recycling process of yellow phosphorus slag by moulding under thermal state, the chemical composition of yellow phosphorus slag was analyzed, and the thermodynamic equilibrium states of harmful elements S, As, F and P in systems of the preparation of the porous ceramics and the glass-ceramics from yellow phosphorus slag were calculated respectively by using the thermodynamic computer software package Fact Sage 6.1. The results show that in the preparation process of porous ceramics, the release amount of gaseous pollutants from raw material increases gradually with the rise of temperature, and the increases in concentration of S- and As-containing gaseous pollutants are no longer obvious when the temperatures climb up to 900 ℃ and 300 ℃, respectively; In preparation of glass-ceramics, although the temperature at which each gaseous pollutant begins to release is different from that in the preparation of porous ceramics, the release rules of gaseous pollutants are consistent. When the temperatures in the preparations of the porous ceramics and the glass-ceramics reach 1 200 ℃ and 1 400 ℃, respectively, all S forms S-containing gaseous species which appears in the form of SO2 or the mixture of SO2 and SO3, more than 85% of As changes into the gaseous As F3, less than 4% of F changes into gaseous Si F4, and all P exists in molten Ca3（PO4）2.