(中南大學(xué) 冶金與環(huán)境學(xué)院，長(zhǎng)沙 410083)
摘 要: 研究輝鉬礦硝-硫酸浸出過(guò)程的浸出動(dòng)力學(xué)，考察反應(yīng)溫度、硝酸濃度、硫酸濃度對(duì)輝鉬礦浸出速率的影響。結(jié)果表明：采用等浸出率法求得反應(yīng)表觀活化能為61.3 kJ/mol，輝鉬礦硝-硫酸浸出過(guò)程受表面化學(xué)反應(yīng)控制，浸出速率常數(shù)對(duì)溫度的依賴程度高；硝酸和硫酸濃度的反應(yīng)級(jí)數(shù)分別為1.4和0.54，硝酸濃度的變化嚴(yán)重影響浸出反應(yīng)速度，提高硝酸濃度可加速礦物氧化并提高鉬浸出率，而硫酸濃度的影響相對(duì)較小。
關(guān)鍵字: 輝鉬礦；動(dòng)力學(xué)；等浸出率法；相對(duì)變化率
（School of Metallurgy and Environment, Central South University, Changsha 410083, China）
Abstract:Kinetics of molybdenite leaching by nitric acid in sulfuric acid was studied. The effects of reaction temperature, concentration of nitric acid and sulfuric acid concentration on the leaching rate of molybdenite were investigated. The results show that, using the application of iso-leaching rate method, the apparent activation energy calculated is 61.3 kJ/mol. The reaction is chemically controlled and the leaching rate depends strongly on temperature. Also, the reaction order with respect to concentration of nitric acid and sulfuric acid are 1.4 and 0.54, respectively, the change in nitrate concentration affects the leaching reaction speed strongly, and increasing nitric acid concentration can accelerate the oxidation of the mineral and improve the leaching rate of molybdenum. But the effect of sulfuric acid concentration on leaching is not significant.
Key words: molybdenite; kinetics; iso-leaching rate method; relative change rate
