Extracting Nickel and Magnesium from Ultra-Low Grade Nickel Silicate Ore Based on Enhanced Roasting Leaching Method AITranslate
Abstract AITranslate
Nickel as an important strategic metal，is widely used in military manufacturing and new energy fields，due to the rapid development of new energy，the price of nickel is gradually rising，and the competition for nickel resources is becoming increasingly fierce. With the depletion of easily processed and highly valuable nickel ore resources，difficult to treat nickel ore resources，especially nickel silicate ore resources，are gradually receiving attention. Nickel silicate ore is a relatively difficult to treat nickel ore，especially low-grade nickel silicate ore，the current methods for treating nickel silicate mainly include nickel matte smelting，nickel iron smelting，reduction roasting ammonia leaching method，chlorination separation roasting magnetic separation method，high-pressure acid leaching method，etc. The first two methods mentioned above are suitable for treating nickel ores with high nickel iron content，while the reduction roasting ammonia leaching method and chlorination separation roasting magnetic separation method are suitable for treating nickel ores with a nickel grade of about 1%. Although the high-pressure acid leaching method has a high nickel recovery rate，but it is mainly suitable for nickel oxide ores with low silicon and magnesium content，and there are problems such as high investment costs and equipment corrosion.At present，the nickel in the tailings of many nickel beneficiation plants is mainly nickel silicate，which is difficult to separate and can only be stacked in tailings ponds，causing waste of nickel resources，if the nickel silicate in the tailings of nickel beneficiation plants can be utilized，it will create significant economic benefits.In order to extract nickel from nickel silicate，an efficient method had been developed，the ultra-low grade nickel silicate ore was treated by using enhanced roasting leaching method in this paper. The influence of various factors on the leaching effect of nickel and magnesium was investigated，and the optimal process conditions were obtained. The mechanism of calcium fluoride improving the leaching rate of nickel and magnesium was revealed through X-ray diffraction （XRD），Fourier transform infrared spectrometer （FTIR） and scanning electron microscope （SEM）. The results showed that，under the conditions of roasting temperature of 1100 ℃，roasting time of 60 min，calcium fluoride dosage of 10%，leaching end point pH of 1.5，leaching temperature of 50 ℃，leaching time of 5 h，nickel leaching rate could reach 74.9%，magnesium leaching rate could reach 84.3%，the use of enhanced roasting leaching method could effectively extract nickel and magnesium from ores. It could be found from the experiment that the roasting of calcium fluoride could improve the leaching rate of nickel and magnesium in the roasting stage and leaching stage. The mechanism of calcium fluoride improving the leaching rate of nickel and magnesium was as follows：during the roasting process，fluoride ions dissociated from calcium fluoride replace O2− and entered the mineral lattice，causing the stable bridging oxygen bonds in the mineral to break，causing the collapse of silica tetrahedra，strengthening the destruction of mineral crystal structure，and further releasing nickel and magnesium. In addition，in the leaching process，fluoride ion，nickel ion and magnesium ion were easy to form acid soluble nickel fluoride complexes and magnesium fluoride complexes，and increasing the stability of nickel and magnesium ions in the leaching solution. Moreover，fluoride ions were more likely to penetrate into the interior of the silicate structure，reducing the potential difference caused by hydrogen ion migration，promoting the diffusion of hydrogen ions within the silicate，and strengthening the displacement and desorption effect of hydrogen ions on nickel and magnesium in the silicate. At the same time，fluoride ion could corrode silicate mineral under acidic conditions，release nickel and magnesium ions adsorbed in minerals，and improve the leaching rate of nickel and magnesium under the combined action. The study explored the treatment of low grade by enhanced roasting leaching method from the perspectives of experimental results and mechanism，and it also provided a theoretical basis. Enhanced roasting leaching method could serve as a technical reserve，and as nickel prices gradually rose，the applicability of this method gradually became apparent.This study could provide certain reference and reference for the treatment of nickel silicate ore，and had important reference significance for nickel extraction in complex nickel ores，at the same time，it could also promote the development of nickel resource comprehensive utilization technology.
KeyWords AITranslate
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Basic Information:
DOI：10.13373/j.cnki.cjrm.XY23060012
Chinese Library Classification Number:TF111
Citation Information:
Nickel as an important strategic metal，is widely used in military manufacturing and new energy fields，due to the rapid development of new energy，the price of nickel is gradually rising，and the competition for nickel resources is becoming increasingly fierce. With the depletion of easily processed and highly valuable nickel ore resources，difficult to treat nickel ore resources，especially nickel silicate ore resources，are gradually receiving attention. Nickel silicate ore is a relatively difficult to treat nickel ore，especially low-grade nickel silicate ore，the current methods for treating nickel silicate mainly include nickel matte smelting，nickel iron smelting，reduction roasting ammonia leaching method，chlorination separation roasting magnetic separation method，high-pressure acid leaching method，etc. The first two methods mentioned above are suitable for treating nickel ores with high nickel iron content，while the reduction roasting ammonia leaching method and chlorination separation roasting magnetic separation method are suitable for treating nickel ores with a nickel grade of about 1%. Although the high-pressure acid leaching method has a high nickel recovery rate，but it is mainly suitable for nickel oxide ores with low silicon and magnesium content，and there are problems such as high investment costs and equipment corrosion.At present，the nickel in the tailings of many nickel beneficiation plants is mainly nickel silicate，which is difficult to separate and can only be stacked in tailings ponds，causing waste of nickel resources，if the nickel silicate in the tailings of nickel beneficiation plants can be utilized，it will create significant economic benefits.In order to extract nickel from nickel silicate，an efficient method had been developed，the ultra-low grade nickel silicate ore was treated by using enhanced roasting leaching method in this paper. The influence of various factors on the leaching effect of nickel and magnesium was investigated，and the optimal process conditions were obtained. The mechanism of calcium fluoride improving the leaching rate of nickel and magnesium was revealed through X-ray diffraction （XRD），Fourier transform infrared spectrometer （FTIR） and scanning electron microscope （SEM）. The results showed that，under the conditions of roasting temperature of 1100 ℃，roasting time of 60 min，calcium fluoride dosage of 10%，leaching end point pH of 1.5，leaching temperature of 50 ℃，leaching time of 5 h，nickel leaching rate could reach 74.9%，magnesium leaching rate could reach 84.3%，the use of enhanced roasting leaching method could effectively extract nickel and magnesium from ores. It could be found from the experiment that the roasting of calcium fluoride could improve the leaching rate of nickel and magnesium in the roasting stage and leaching stage. The mechanism of calcium fluoride improving the leaching rate of nickel and magnesium was as follows：during the roasting process，fluoride ions dissociated from calcium fluoride replace O2− and entered the mineral lattice，causing the stable bridging oxygen bonds in the mineral to break，causing the collapse of silica tetrahedra，strengthening the destruction of mineral crystal structure，and further releasing nickel and magnesium. In addition，in the leaching process，fluoride ion，nickel ion and magnesium ion were easy to form acid soluble nickel fluoride complexes and magnesium fluoride complexes，and increasing the stability of nickel and magnesium ions in the leaching solution. Moreover，fluoride ions were more likely to penetrate into the interior of the silicate structure，reducing the potential difference caused by hydrogen ion migration，promoting the diffusion of hydrogen ions within the silicate，and strengthening the displacement and desorption effect of hydrogen ions on nickel and magnesium in the silicate. At the same time，fluoride ion could corrode silicate mineral under acidic conditions，release nickel and magnesium ions adsorbed in minerals，and improve the leaching rate of nickel and magnesium under the combined action. The study explored the treatment of low grade by enhanced roasting leaching method from the perspectives of experimental results and mechanism，and it also provided a theoretical basis. Enhanced roasting leaching method could serve as a technical reserve，and as nickel prices gradually rose，the applicability of this method gradually became apparent.This study could provide certain reference and reference for the treatment of nickel silicate ore，and had important reference significance for nickel extraction in complex nickel ores，at the same time，it could also promote the development of nickel resource comprehensive utilization technology.
quote
| GB/T 7714-2015 | [1] Kan Wen, Zhao Wang, Yaoshan Li, et al. Extracting Nickel and Magnesium from Ultra-Low Grade Nickel Silicate Ore Based on Enhanced Roasting Leaching Method[J]. Chinese Journal of Rare Metals, 2024, 48(12): 1815-1822. DOI:10.13373/j.cnki.cjrm.XY23060012. |
| MLA | [1] Kan Wen, et al., "Extracting Nickel and Magnesium from Ultra-Low Grade Nickel Silicate Ore Based on Enhanced Roasting Leaching Method." Chinese Journal of Rare Metals, vol. 48, no. 12, 2024, pp. 1815-1822, https://doi.org/10.13373/j.cnki.cjrm.XY23060012. |
| APA | [1] Kan Wen, Zhao Wang, Yaoshan Li, Yuan Liu, Wanwen Xie, & Huatai Wang. (2024). Extracting Nickel and Magnesium from Ultra-Low Grade Nickel Silicate Ore Based on Enhanced Roasting Leaching Method. Chinese Journal of Rare Metals, 48(12), 1815-1822. https://doi.org/10.13373/j.cnki.cjrm.XY23060012 |
| IEEE | [1] Kan Wen, Zhao Wang, Yaoshan Li, Yuan Liu, Wanwen Xie, and Huatai Wang, "Extracting Nickel and Magnesium from Ultra-Low Grade Nickel Silicate Ore Based on Enhanced Roasting Leaching Method," Chinese Journal of Rare Metals, vol. 48, no. 12, pp. 1815-1822, 2024, doi: 10.13373/j.cnki.cjrm.XY23060012. keywords: {enhanced roasting;nickel silicate;acid leaching;nickel recovery;calcium fluoride} |