湿法炼锌窑渣铁精矿中有价组分浸出行为及其机理.pdfVIP

Trans. Nonferrous Met. Soc. China 27(2017) 901−907 Leaching of iron concentrate separated from kiln slag in zinc hydrometallurgy with hydrochloric acid and its mechanism 1,2 1 1 1 1 1,2 1 Hong-jun WANG , Zhi-yong LIU , Zhi-hong LIU , Yu-hu LI , Si-wei LI , Wen-Hai ZHANG , Qi-hou LI 1. School of Metallurgy and Environment, Central South University, Changsha 410083, China; 2. Institute of Metallurgy, China Nerin Engineering Co., Ltd., Nanchang 330031, China Received 25 September 2016; accepted 23 February 20 17 Abstract: It is taken as a novel prospective process to treat iron concentrate from hydrometallurgical zinc kiln slag for comprehensive utilization of valuable metals by a hydrochloric acid leaching-spray pyrolysis method. The leaching mechanism of different valuable metals was studied. The results revealed that the leaching rates of Ag, Pb, Cu, Fe, As and Zn were 99.91%, 99.25%, 95.12%, 90.15%, 87.58% and 58.15%, respectively with 6 mol/L HCl and L/S ratio of 10:1 at 60 °C for 120 min. The action of SiO in leaching solution was also studied. The results showed that the precipitation and settlement of SiO (amorphous) adsorbed 2 2 part of metal ions in solution, which greatly inhibited the leaching of Cu, Fe, As and Zn, so it is crucial to control the precipitation of amorphous SiO . 2 Key words: kiln slag; iron concentrate; hydrochloric acid leaching; amorphous silica