Research and application on energy saving and consumption reduction technology of lateritic nickel ore sintering
XUE Yu-xiao1, PAN Jian1, ZHU De-qing1, PAN Liao-ting2, HUANG Qing-zhou2, HUANG Xue-zhong2
1. School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, Hunan, China; 2. Guangxi Beibu Gulf New Material Co., Ltd., Beihai 536000, Guangxi, China
Abstract: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/(m2·h) to 56.93% and 1.15 t/(m2·h) respectively. Solid fuel consumption decreased from 140.52 to 107.91 kg/t and the maximum contents of CO2, NOx and SO2 in gas emission were obviously reduced from 27.42%, 0.019 8% and 0.261 5% to 19.89%, 0.015 4% and 0.203 0% 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.
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