Poor permeability and low sintering productivity restrict the development of high-bed sintering. An efficient method of the double-layer sintering process (DLSP) was proposed to achieve high-bed sintering and solve the aforementioned problems. Theoretical calculation and sintering pot experiments were implemented to investigate the double-layer sintering process. Traditional sintering process and DLSP were compared in terms of sintering indices, metallurgical properties and morphology characterization. Under the condition of traditional sintering process, DLSP successfully realized fast velocity and highly productive sintering of 1000-mm high bed. After the sintering bed is charged and ignited twice, the air permeability of the bed has been greatly improved. Sintering time is shortened significantly by simultaneous sintering of the upper and lower feed layers. Under the condition of bed height proportion of 350/650 mm and pre-sintering time of 20 min, the yield, tumbler strength, productivity and solid fuel consumption are 69.96%, 65.87%, 1.71 t (m² h)⁻¹ and 56.71 kg/t, respectively. Magnetite, hematite, calcium ferrite and complex calcium ferrite are the main phases of DLSP products. The metallurgical properties of DSLP products meet the requirement of ironmaking. It indicates that DLSP is an effective method to solve the disadvantages of bad permeability and low sintering productivity in high-bed sintering.

渗透性差和烧结生产率低限制了高床烧结的发展。提出了一种高效的双层烧结工艺（DLSP），以实现高床层烧结并解决上述问题。进行了理论计算和烧结罐实验，以研究双层烧结过程。从烧结指数，冶金性能和形貌表征等方面对传统烧结工艺和DLSP进行了比较。在传统的烧结工艺条件下，DLSP成功地实现了1000毫米高床层的快速烧结和高生产率的烧结。将烧结床装料并点燃两次后，床的透气性得到了极大的提高。通过同时烧结上下进料层，可大大缩短烧结时间。在床高比为350/650 mm，预烧结时间为20 min的条件下，产量，制粉强度，生产率和固体燃料消耗分别为69.96％，65.87％，1.71 t（m）²  h）^-1和56.71 kg / t。磁铁矿，赤铁矿，铁酸钙和复合铁酸钙是DLSP产品的主要相。DSLP产品的冶金性能满足炼铁要求。这表明DLSP是解决高层烧结中渗透性差，烧结生产率低的缺点的有效方法。