摘要：
為提高CRT含鉛玻璃中鉛的浸出率,研究了不同樣品在氫氧化鈉溶液體系中鉛的浸出率變化,考察了二氧化硅、還原性鐵粉等不同添加劑在機(jī)械活化過程中的作用.研究結(jié)果表明,添加二氧化硅等物質(zhì),并不能改變CRT玻璃的非晶狀態(tài),但能起到分散作用,降低樣品粒徑,提高鉛浸出率;還原性鐵粉在機(jī)械活化中能起分散作用和降低鍵能的作用,且在浸出過程中有微量置換作用,從而大幅度提高鉛浸出率;水是良好的分散劑,濕磨過程中,粉末會與不銹鋼球磨罐中的鐵發(fā)生反應(yīng),使鉛浸出率顯著提高.不添加任何物質(zhì)機(jī)械活化的樣品金屬鉛浸出率僅為40.86%,添加15%鐵粉機(jī)械活化或濕磨處理后的樣品,在4 mol/L的氫氧化鈉溶液中反應(yīng)3 h,鉛浸出率可達(dá)85%以上.%In order to improve the leaching rate of lead from cathode-ray tube ( CRT) funnel glass, researches were conducted on the efficiency of lead extraction from different samples in sodium hydroxide solution, and effects of different additives, such as silicon dioxide and reductive iron powder, on mechanical activation process. Results indicated that an addition of silicon dioxide didn′t change the amorphous state of CRT glass, but improved lead leaching rate due to its dispersion effect and the reduction in the particle size of sample. The iron powder for reduction was helpful to reduce the bond energy and led to micro replacement reaction during the leaching process, resulting in the lead leaching rate greatly increased. During the wet grinding process, with water as a good disperser, the powdered material reacted with iron of stainless steel ball in the ball mill, also resulting in an increase in the lead leaching rate. It is shown the leaching rate of lead from samples without any additives after mechanical activation was only around 40.84%. However, after mechanical activation with an addition of 15% iron powder or wet grinding treatment for the sample, the reaction in 4 mol/L sodium hydroxide solution for 3 h resulted in the lead leaching rate exceeding 85%.
AI期刊論文
文獻(xiàn)查詢
文獻(xiàn)下載
文獻(xiàn)閱讀
文獻(xiàn)發(fā)表
