磷石膏热分解研究现状

热分解是磷石膏资源化利用的关键,但在不添加还原剂和催化剂的条件下,存在能耗高、成本高、分解率低等缺点,不利于磷石膏的循环再利用,因此寻找能降低磷石膏分解温度、提高分解率的还原剂和催化剂成为当下的研究重点。本文对磷石膏在还原剂和催化剂作用下的热分解过程及其研究状况进行了综述。研究发现,CO和焦炭等燃料型传统还原剂能有效降低磷石膏的分解初始温度,提高分解率,在实际应用中更为成熟。然而,燃料型传统还原剂的应用给磷石膏的热分解也带来了成本压力。添加非传统还原剂(如硫磺、H₂S)和催化剂不仅能降低磷石膏热分解的成本,还能减少温室气体CO₂的排放,但该研究目前还处于试验阶段。寻找能耗和成本更低、分解率更高的还原剂和催化剂是未来实现磷石膏绿色、低碳、高效资源化利用的研究方向。

Research Status of Phosphogypsum Pyrolysis

Pyrolysis is the key of resource utilization of phosphogypsum. However, in the absence of reducing agents and catalysts, the disadvantages of phosphogypsum utilization include high energy consumption, high cost and low decomposition rate. Therefore, it is an important challenge to find the reducing agents and catalysts which can reduce the decomposition temperature of phosphogypsum and improve the decomposition rate. In this paper, the research status of the pyrolysis process of phosphogypsum was reviewed in the presence of reducing agents and catalysts. Traditional fuel-based reducing agents, e.g. CO and coke, have more advantages in practical application, which can effectively reduce the initial decomposition temperature of phosphogypsum and improve the decomposition efficiency. The addition of non-traditional reducing agents (sulfur, H₂S) and catalysts can not only reduce the cost of phosphogypsum pyrolysis, but also reduce the emission of greenhouse gas CO₂ during the pyrolysis of phosphogypsum. However, this method is still in the experimental research. Searching for suitable reducing agents and catalysts with higher decomposition efficiency and lower energy consumption and cost in the pyrolysis process is crucial for achieving green, low-carbon and efficient resource utilization of phosphogypsum.