四川某低品位微细粒氧化金矿非氰浸出试验研究

Experimental study on non-cyanide leaching of a low grade oxidized micro fine gold ore in Sichuan

对金品位为2.02g/t的某低品位氧化微细粒金矿开展了全泥浸出提取金的试验研究。优选出非氰浸出剂CC-1,确定了相应工艺参数,在此基础上开展了3个粒级柱浸试验,对柱浸含金溶液进行了活性炭吸附试验,研究表明该矿石适宜于利用非氰浸出剂CC-1堆浸回收金。矿石磨至-200目占80%、矿浆液固比2:1、石灰用量3000 g/t原矿、CC-1浓度0.10%、浸出时间30 h条件下金浸出率92.75%;在石灰用量3000 g/t、CC-1浓度0.10%、浸出时间10 d时-10 mm矿样Au浸出率92.46%,浸出时间15 d时-20 mm及-30 mm矿样Au浸出率分别为91.49%、89.24%。采用CC-1作为浸出剂的含Au溶液活性炭吸附率为95.72%~97.11%。

Leaching experiments were carried out.to extract Au from a low-grade oxidized fine-grained gold ore with Au grade of 2.02 g/t by adopting the whole slime leaching method.The non-cyanide leaching agent CC-1 was selected and the corresponding parameters were determined.On this basis,leaching tests were done on three ore samples of different particle size and then gold was absorbed from the leaching solution by activated carbon filled in column.It is shown that the heap leaching with the non-cyanide leaching agent CC-1 was suitable for the ore.The leaching rate of Au reached 92.75%,when the ore was ground to-200 mesh accounting for 80%and the slurry liquid-solid ratio was 2:1 and the lime dosage was 3000 g/t raw ore and the CC-1 concentration is 0.10%and the leaching time was 30 h.The adsorption rate of gold from the leaching solution was up to 95.72%~97.11%.