用硫酸从青海含铜红土型硅酸镍矿石浸出镍、铜试验研究

Reseach on Acid Leaching Processes of A Nickel-copper Laterite Silicate Ore From Qinghai

研究了青海某含铜红土型硅酸镍矿石的常压和加压酸浸。试验结果表明:对于常压酸浸,在磨矿粒度-0.15mm占95%、硫酸用量80%、浸出温度90℃、液固质量比2.3∶1、浸出时间3h条件下,镍、铜浸出率分别为86.8%和92.6%;对于加压酸浸,在磨矿细度-0.15mm占95%、硫酸用量60%、浸出温度120℃、液固体积质量比1.5∶1、浸出时间2h条件下,镍、铜浸出率分别为92.4%和94.0%。常压酸浸与加压酸浸均可得到较高的金属浸出率,但加压酸浸效率更高,且对杂质金属铁的浸出有一定抑制作用。

T he comparison tests for atmosphere leaching and pressure leaching of a nickel-copper laterite silicate ore from Qinghai were conducted .The results showed that both atmosphere leaching and pressure leaching can gain high leaching rate .At the conditions of atmosphere ,temperature of 90℃ ,ore granularity of -100 mesh accounting for 95% ,acid usage of 800 kg/t ores ,pulp density of 30% and agitation time of 3 h ,the leaching rate of Ni and Cu is 86 .8% and 92 .6% ,respectively .While at the conditions of pressure （202 kPa ） ,temperature of 120 ℃ ,ore granularity of - 100 mesh accounting for 95% ,acid usage of 600 kg/t ores ,pulp density of 40% ,and agitation leaching time of 2h ,the leaching rate of Ni and Cu is 92 .4% and 94 .0% ,respectively .However ,compared with the atmosphere leaching ,the pressure leaching can gain a higher leaching rate ,w hat is more important that it would have some inhibiting effect for Fe leaching .