基于干法粒化与化学法热量回收的含钛高炉渣碳化工艺研究

A new process, that the atomization process with rotating disk were coupled with low temperature reduction and carbonization process with the mixture of CH4 and H2, were suggested based on the present process which was called high temperature carbonization, low temperature chlorination technology and cement production with the slag tailing, in order to solve the utilization problem with blast furnace slag with high TiO2. The main objects are as follows: (1) the waste heat can be recovered with the atomization process with rotating disk, and (2) the slag foaming, complex flow sheet and high energy consumption problems can be solved by using the gas based reduction and carbonization with mixture gas of CH4 and H2 at low temperature. The atomization process of the blast furnace slag, the reduction and carbonization process of the slag particles, and the mass and energy balance of the coupled process will be studied in order to make sure the atomization mechanism and the regularity of the reducing and carbonization, and to find the optimal operation parameters. All the studies will give well references and technology support to the final industrial application.

针对含钛高炉渣资源综合利用的难题，在原有高温碳化—低温氯化提钛—尾渣制备水泥流程基础上，提出采用炉渣干法粒化—甲烷/氢气低温碳化工艺替代高温碳化的新工艺。项目的主要出发点在于通过干法粒化工艺回收炉渣显热，通过低温气基碳化工艺解决高温碳化工艺难以解决的炉渣泡沫化、流程复杂和能耗高的问题。拟开展的研究内容包括：含钛高炉渣转盘粒化工艺基础研究，含钛高炉渣颗粒气基还原与碳化行为研究，干法粒化—气基碳化工艺流程的能量及物料平衡规律研究等。通过上述研究以阐明含钛高炉渣转盘粒化过程中各参数间相互影响规律及炉渣粒度控制方法，揭示含钛高炉渣颗粒在快速碳化过程中的物相转变规律及碳化率的调控方法，明确含钛高炉渣干法粒化与快速碳化联合工艺中的物料及能量守恒规律。打通新流程的关键技术环节，降低原有工艺能耗，最终为新工艺的产业化提出技术支撑。

开展了含钛高炉渣高温转盘粒化工艺研究，明确了粒化工艺参数对含钛高炉渣粒度及形貌的影响。查明了含钛高炉渣结晶过程中碱度对结晶物相的影响规律以及主要含钛物相的形貌及粒度变化规律。开展了CH4-H2体系及CH4-H2-N2体系下含钛高炉渣主要含钛物相（TiO2、钙钛矿和镁钛矿）的还原及碳化热力学和实验研究，明确了CH4-H2还原碳化含钛高炉渣的行为及物相转变规律。基于该反应体系下主要还原气氛（CH4、CO、H2），推导了TiO2等多价态氧化物气固反应动力学公式，建立了含钛高炉渣碳化的数学模型。