菲律宾某红土矿两段酸浸研究

研究了一段高酸—二段中和两段联合浸出红土矿新工艺。结果表明,该红土矿经人工分级后,细粒级矿石在温度95℃、反应时间6 h、初始矿浆浓度32%、酸矿比1.05的条件下,镍、钴一段高酸浸出率分别为97.39%、94.14%;一段浸出后矿浆与粗粒级矿石矿浆混合后在温度95℃、反应时间15 h、粗细粒级矿石质量比1.34的条件下,镍、钴二段中和浸出率分别为82.04%、93.35%,浸出后液含铁浓度小于2 g/L。

Study of Two-stage Acid Leaching Process on Nickel Laterite Ore in Philippine

The two-stage leaching process, which combined high acid leaching with neutralization leac- hing, has been researched to deal with laterite ore in this paper. The results showed that the respective extraction of Ni and Co from ONB0 sample （ -5 mm） in the primary acid leaching stage were 97.39% and 94. 14% , under the following optimum-conditions： reaction temperature 95℃ , residence time 6 hours, initial slurry concentration 32% , t-acid/t-ore 1.05. ONA0 sample （ ＋ 5 mm） slurry was added to the primary leach residue slurry as the feed of the neutralization leach, and the optimum mass （ONA0）/ mass （ONB0） was 1.34. The neutralization leach test results showed that the respective extraction of Ni and Co were 82.04% and 93.35% , with the Fe concentration of the solution reducing to less than 2 g/L, under the following conditions： reaction temperature 95℃ , residence time 15 hours.