In recent years, there has been an increasing focus on the utilization of low-grade nickel laterite ore. In this study, the technology for efficient utilization of nickel laterite ore was investigated. The results indicate that the experimental sample is a kind of strong acidic ferric oxide ore containing nickel, which tends to appear as a complex with argillaceous mineral. The results indicate that the ultrasonic field has a significant effect on the leaching rates of nickel and iron.Optimum leaching conditions were found as follows: size of mineral particles: 95% less than 0.074 mm; leaching temperature: 80 °C; concentration of sulfuric acid: 190 g/L; liquid-solid ratio: 5:1; leaching time: 2 h; stirring speed: 400 rpm. Under these conditions, the leaching rates of nickel and iron reach 98.35% and 91.28% with the ultrasonic field exertion working 4 min every 5 min. In contrast, the leaching rates of nickel and iron are 78.84% and 80.26% after 2 h without the ultrasonic field. A product with Fe grade of 63.56% could be obtained by precipitation and roasting, the total recovery of nickel and iron reaching 95.62% and 86.50%, respectively. The reasonable recovery technology of nickel laterite ore containing a high content of limonite minerals was determined by this work.
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Chen et al. (2015) studied this question.