银锌渣制备高纯氧化铋除铅银的研究

银锌渣经HCl-NaClO₃-NaCl 溶液浸取得到BiCl₃ 溶液, BiCl₃ 溶液中的Pb²⁺和Ag⁺含量分别高达1371.4 mg/L 和46.1 mg/L。在此BiCl₃ 溶液中, 采用银锌渣除Pb²⁺ 、Nal 除Ag⁺, 当银锌渣除铅条件为液固比10∶1、起始pH 值0.3～0.4、搅拌速度1 000 r/min、反应时间不超过15 min、加入NaI 的量为理论量的1.2～1.4 倍除银铅时, 溶液中的Pb²⁺和Ag⁺降到1 mg/L 左右, 将除Pb²⁺ 、Ag⁺后的BiCl₃ 溶液水解、转化可以制得高纯Bi₂O₃ 。

Removal of Pb and Ag in Preparation of High Purity Bi2O3 from Silver-zinc Slag

Bi₂O₃ solution was obtained by leaching silver-zinc slag with HCl-NaClO₃-NaCl solution.Pb²⁺ and Ag⁺ were up to 1 371 mg/L and 46.1 mg/L in BiCl₃ solution respectively.Pb²⁺ and Ag⁺ in the solution were removed respectively by silverzine slag and NaI.Pb²⁺ and Ag⁺ in the solution were decreased to about 1 mg/L under the conditions that the mass ration of BiCl₃ solution to silver-zine slag was 10∶1;the intial pH, 0.3～0.4;the agitation speed, 1 000 r/min;the reaction time, no more than 15 mins;and the addition amount of NaI, 1.2～1.4 times of the theoretical amount.High purity Bi₃O₂ was prepared from the deleaded and desilvered BiCl3 solution by hydrolysis and conversion.