Pressurization, water immersion and oxidation preprocessing cyaniding gold extraction method for difficult-processing gold concentrates

The invention relates to a pressurization, water immersion and oxidation preprocessing cyaniding gold extraction method for difficult-processing gold concentrates, which aims at the gold concentrates with higher sulfur-containing, mainly containing iron pyrite, concomitant with copper pyrite, zinc blende and the like, and comprises the following steps: performing ball-milling on the raw material gold concentrates, performing size mixing, cyaniding for gold extraction after pressurization, water immersion and oxidation preprocessing to obtain a pregnant solution with gold-containing of 0.010 g/L-0.040 g/L, and the gold cyanide leaching rate reaches 96% of a smelting indicator. In the invention, the initial media are neutral, an acid or alkali reagent is not needed, and only the neutral additive lignosulphonate is needed, so that the process cost is reduced, and the extremely high gold recovery rate is realized at the same time.