含锑难处理金精矿加压氧化法制备焦锑酸钠的工艺研究

锑及其化合物是重要的战略物资，焦锑酸钠被广泛应用于玻璃行业。锑金矿是难处理金矿的一种，直接氰化浸出时金的浸出率极低，需要进行预处理后才能提取金。针对某矿山含锑较低的难处理金精矿的特点，并结合目前难处理金矿的各种预处理方法的优缺点，研究确定了该类难处理金精矿适宜采用先回收锑再回收金的思路，即以含锑难处理金矿为原料，采用硫化钠浸出法优先分离锑，使锑以硫代亚锑酸钠形式进入滤液，然后采用加压氧化新工艺以焦锑酸钠产品的形式回收锑，氧化后的滤液经过净化和浓缩结晶后产出硫代硫酸钠产品，脱除锑后的浸出渣用细菌氧化预处理，最后用氰化法从细菌氧化渣中提取金，从而实现难处理金精矿中锑、硫、金的综合回收。

Process research on making sodium pyroantimonate from antimony-containing refractory gold concentrates using pressure oxidation method

Antimony and its compounds are important strategic resources,and sodium pyroantimonate was widely used in glass industry. Antimony-gold ore is a refractory gold ore, on which cyanide leaching has little effect, therefore, pretreatment is needed for gold extraction. In this paper, on account of the low antimony content of antimony-containing refractory gold concentrates, and combined with the advantages and disadvantages various pretreatment methods have in treating the refractory gold ores, research work takes that prior recovery of antimony to gold fits this specific refracto- ry ore type better. During such process antimony-containing refractory gold ores act as raw materials, sodium sulfide leaching is applied to selectively separate antimony, antimony enters the leaching solution in the form of sodium thioan- timonite, and then antimony is recovered as sodium pyroantimonate using the new technology of pressure oxidation. The oxidized solution is purified and crystallized via concentrating and sodium thiosulfate products are obtained. The resi- due after removal of antimony is pretreated by bacterial oxidation, and with cyanidation extraction gold is recovered from bacterial oxidation residue so as to realize comprehensive recovery of antimony, sulfur, gold from the refractory gold concentrates.