红土镍矿烧结节能降耗技术研究及应用

Research and application on energy saving and consumption reduction technology of lateritic nickel ore sintering

褐铁矿型红土镍矿具有较低的铁品位和丰富的结晶水及高熔点矿物,这导致其烧结矿产质量低、固体燃耗高。通过开发加压致密化烧结技术、热废气循环烧结技术及多力场协同强化烧结技术,显著改善了其烧结矿产质量指标,有力地促进了节能减排。相对于常规烧结工艺,采用多力场协同强化技术后,烧结矿转鼓强度由45.87%增至56.93%,利用系数由0.97增至1.15 t/(m^(2)·h),固体燃耗从140.52减至107.91 kg/t,废气中CO_(2)、NOx及SO_(2)最高体积分数分别由27.42%、0.0198%和0.2615%降至19.89%、0.0154%及0.2030%,有害气体排放明显减少。这在相关工业应用中得到进一步验证。为更好地实现褐铁矿型红土镍矿烧结的清洁生产,可开发球团烧结技术,以进一步改善烧结矿产质量指标和降低生产能耗,值得大力推广应用。

Limonitic nickel laterite sintering is characterized by low quality and high solid fuel consumption due to its low iron grade as well as high contents of crystal water and high smelting minerals.A series of innovative sintering technologies were exploited including pressurized densification sintering technology,hot exhaust-gas recirculation technology and multi-force fields sintering technology for improving sintering performance of limonitic nickel laterite and achieving energy conservation and emission reduction.With the application of multi-force fields sintering technology,tumble index and productivity of product sinter increased from 45.87%and 0.97 t/(m^(2)·h)to 56.93%and 1.15 t/(m^(2)·h)respectively.Solid fuel consumption decreased from 140.52 to 107.91 kg/t and the maximum contents of CO_(2),NOx and SO_(2)in gas emission were obviously reduced from 27.42%,0.0198%and 0.2615%to 19.89%,0.0154%and 0.2030%respectively,which was further supported by the results of relevant industrial application.In order to achieve clean sintering production of limonitic nickel laterite,pellet sintering technology can be developed with a bright application prospect,which is in favor of further improvement of sinter indices and reduction of energy consumption.