(東北大學(xué) 冶金學(xué)院，沈陽(yáng) 110819)
摘 要: 采用X射線衍射和原子吸收光譜法研究向高鉛渣添加廢棄陰極射線管顯示器含鉛玻璃回收玻璃中鉛的可行性，探討還原煤用量、還原溫度、還原時(shí)間和鈣硅比對(duì)鉛、鋅回收率的影響，分析還原渣的物相變化以及玻璃加入量對(duì)還原渣熔融特性和黏度的影響。結(jié)果表明：通過(guò)該方法可有效地將玻璃中的鉛回收，適宜的含鉛玻璃加入量為10%~20%(質(zhì)量分?jǐn)?shù))。最佳熔煉條件如下：碳氧比0.8、還原溫度1230 ℃、還原時(shí)間70 min、鈣硅比0.7。在此條件下，鉛回收率可達(dá)96%以上，鋅回收率達(dá)到83%以上。還原渣中的物相主要為鐵氧化物、黃長(zhǎng)石和橄欖石。玻璃的加入會(huì)使渣的熔點(diǎn)降低，液相比例升高，同時(shí)使渣的黏度增加，渣中鉛含量升高。
關(guān)鍵字: 含鉛玻璃；高鉛渣；還原熔煉；鉛回收；Factsage軟件
（School of Metallurgy, Northeastern University, Shenyang 110819, China）
Abstract:The feasibility of lead extraction from waste cathode ray tubes (CRTs) funnel glass by introducing lead glass high lead slag was investigated by X-ray diffraction and atomic absorption spectroscopy. The influences of carbon addition, reducing temperature, reducing time and Ca-Si mass ratio on Pb and Zn recoveries were determined. Also, the phase changes of the residue, the effects of glass addition on the melting behavior and the viscosity of the slag were studied. The results show that the proposed method is an effective approach for extracting lead from funnel glass. The suitable glass addition is 10%-20% (mass fraction), and the optimum conditions are mole ratio C and O of 0.8, reducing temperature 1230 ℃, reducing time 70 min and Ca-Si mass ratio of 0.7. Under these conditions, Pb and Zn recovery rates reach up to 96% and 83%, respectively. The main phases of the residue are iron oxide, melilite and olivine. Meanwhile, the melting point of the slag can be lowered by the addition of funnel glass, resulting in the increase of the liquid phase ratio in the slag. However, it can also cause an increase of the slag viscosity, thereby, increasing the lead content in slag.
Key words: lead glass; high lead slag; reduction smelting; lead recovery; Factsage software
