磷石膏预分解的热分析研究  

Thermal analysis of phosphogypsum decomposition

作　　者：李建锡[1] 余苏[1] 马丽萍[1] 舒艺周[1] 唐霜露[1] 卢凯芳[1] 张平[1] 曹盈盈[1] 

机构地区：[1]昆明理工大学材料与冶金工程学院,昆明650093

出　　处：《环境工程学报》2009年第10期1861-1864,共4页Chinese Journal of Environmental Engineering

基　　金：国家高技术研究发展计划(863)项目(2007AA062321)

摘　　要：采用热分析的方法对磷石膏在不同掺碳量、不同气氛条件下的热反应过程进行了研究,针对近年来提出的利用水泥新型干法技术实现磷石膏预分解制硫酸联产水泥的设想,研究了磷石膏的热分解过程对预热分解炉的适应性。结果表明,在碳与磷石膏的混合体系中,碳仅能在一定程度上促进磷石膏分解,其完全分解温度接近1300℃。而在较强还原气氛中,磷石膏+碳系统生成硫化钙,在约1260℃时才完全分解。因此新型干法水泥工艺分解磷石膏制酸联产水泥新工艺在实际过程中将受限于硫酸盐及硫化物熔点较低与硫酸钙分解温度较高这对矛盾而不宜直接采用。In this paper, the thermal reaction process of phosphogypsum under different conditions, such as carbon-doped and nitrogen protected ones, are studied by the means of thermal analysis. In recent years, a new tentative plan has been put forward in the co-production technique of acid and cement by use of the new dry cement technology with phosphogypsum. The effects of the performance of phosphogypsum decomposition on the flexibility of precalciner burning and the phosphogypsum decomposition efficiency in the cement kiln system are studied. The results showed that the carbon can promote the decomposition of phosphogypsum to only certain extent and the complete decomposing temperature is about 1 300 ℃ in the carbon-doped system, and that in the restore atmosphere region, CaS is formed, and at about 1 265 ℃ calcium sulfate decomposed completely. Therefore the new dry cement technology can not be directly used in the co-production of cement and acid with phosphogypsum by the limitation of low melting point of sulfate and sulfide and higher decomposition temperature of calcium sulfate in the practical process.

关 键 词：磷石膏 新型干法水泥技术 热分析 粘结堵塞 

分 类 号：X705[环境科学与工程—环境工程]