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Outline
A process of solvent extraction-air roasting-sulfuric acid leaching-extraction with extractant-stripping was studied for the recovery of Mo and Fe from direct coal liquefaction residue (DCLR). The results show that after solvent extraction, the residual organic compounds in DCLR are efficiently removed, and the coal liquefaction residue extractant residue (ER) containing residual carbon and ash is obtained. ER is then air-roasted at 600-800 ℃ to completely remove the residual carbon, with Mo and Fe being enriched in the ash. The ash is leached with sulfuric acid to effectively extract Mo, Fe, Al, and other metals, with the highest leaching rates of Mo and Fe reaching 93.10% and 99.12%, respectively. The acid leaching solution is extracted with tri-n-octylamine (N235) extractant to simultaneously extract Mo and Fe, but NaCl is added to form complex anions such as and
, achieving an ideal extraction effect. The optimized extraction process conditions are NaCl addition of 5%, N235∶sec-octyl alcohol∶kerosene ratio of 3∶2∶5, and hydrogen ion concentration greater than 12 mol/L, phase ratio VO/VA between 1/3 and 1/1, and extraction time greater than 2.5 min. Under the conditions, the single extraction rate of Mo is as high as 99.16%, and the extraction rate of Fe is close to 100%. Fe and Mo in the organic phase are sequentially stripped with sulfuric acid and ammonia, and the recovery rates of Fe and Mo in the entire extraction-stripping process are 97.90% and 94.01%, respectively. The method can provide a solution for the recovery of high-value metals in direct coal liquefaction catalysts.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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