CAJ | 학술논문

采用剪切射流曝气反应器对铅阳极泥碱浸脱砷过程进行强化，考察了液固比、氢氧化钠浓度、时间及温度等因素对阳极泥中砷、铅、锑、铋浸出率的影响，通过正交实验优选出最佳浸出工艺条件，即：氢氧化钠浓度1 mol/L、浸出液体积/固体质量（液固比）为6 mL/g、温度70℃、时间1 h.在此最佳工艺条件下，砷浸出率高达95%以上，而铅、锑浸出率分别维持在2%、1%以下，铋基本不被浸出.针对高砷浸出液采用石灰沉砷，沉砷率可达85%以上.沉砷后上清液补充一定的氢氧化钠可返回浸出工序，回用效果理想，浸砷率高达94%以上.与常规碱浸脱砷相比，采用剪切射流曝气碱浸脱砷可以有效地降低NaOH用量，缩短浸出时间及提高砷与有价金属的分离率.由此可见，剪切射流曝气反应器可以应用于含砷物料的预处理，实现砷的高效浸出.
채용전절사류폭기반응기대연양겁니감침탈신과정진행강화，고찰료액고비、경양화납농도、시간급온도등인소대양겁니중신、연、제、필침출솔적영향，통과정교실험우선출최가침출공예조건，즉：경양화납농도1 mol/L、침출액체적/고체질량（액고비）위6 mL/g、온도70℃、시간1 h.재차최가공예조건하，신침출솔고체95%이상，이연、제침출솔분별유지재2%、1%이하，필기본불피침출.침대고신침출액채용석회침신，침신솔가체85%이상.침신후상청액보충일정적경양화납가반회침출공서，회용효과이상，침신솔고체94%이상.여상규감침탈신상비，채용전절사류폭기감침탈신가이유효지강저NaOH용량，축단침출시간급제고신여유개금속적분리솔.유차가견，전절사류폭기반응기가이응용우함신물료적예처리，실현신적고효침출.
In this study, alkaline leaching enhanced by shearing jet aeration reactor was employed to remove arsenic from lead anode sline. The effects of various parameters, such as liquid/solid ratio, concentrations of sodium hydroxide solution, leaching time and temperature, on leaching ratios of different metals were investi-gated. On this basis, the optimal conditions was obtained through orthogonal experiment, namely, 1.0 mol/L NaOH, a liquid/solid ratio of 6∶1, leaching at 70 ℃ for 1 h. Under this optimal condition, the leaching rate of As reached up to 95.0 %, and that of Pb and Sb was less than 2.0 % and 1.0 %, respectively, while Bi was hardly dissolved in alkaline solution. In addition, arsenic-containing leachate could be treated with lime and removal rate of As in leachate exceeding 85 %. Then, the filtrate from lime precipitation was recycled and reused in leaching process. Also, a satisfying result could be obtained with more than 95%of As leaching rate after the filtrate was recycled. Compared with the conventional alkaline leaching for As removal, this process could decrease the dosage of sodium hydroxide, shorten the leaching time, and efficiently improve the separa-tion rate of arsenic and other valuable metals. It can be concluded that the shearing jet aeration reactor can be applied to the pretreatment of arsenic-containing materials and obtain a high leaching rate of arsenic.