席昭博士论文"Improving the desulfurization degree of high-grade nickel matte via a two-step oxidation roasting process"被MMTB接收发表
发布时间：2020-04-25
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Generally, sulfur elimination from nickel matte was incomplete in one-step oxidation roasting process. In this work, XRD, SEM/EDS and chemical analysis of the roasted products were carried out to explain this phenomenon. The results indicated that the melting of heazlewoodite was the main limiting factor. Thereafter, the oxidation mechanism of high-grade nickel matte from room temperature to 1000 oC was studied. It was found that the transformation from heazlewoodite (Ni3S2) to nickel sulfide (NiS) took place from 400 to 520 oC. Considering that the melting temperature of NiS was much higher than that of Ni3S2, a low-temperature roasting step was suggested to suppress the melting of heazlewoodite. Under the optimum conditions (520 oC for 120 min followed by 800 oC for 80 min), the degree of desulfurization reached 99.52%. These results indicated that two-step oxidation roasting method could be a promising process for producing low-sulfur calcine from high-grade nickel matte.
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