温度和氧化物浓度对方铅矿氧化动力学的影响研究

Effect on oxidation kinetics of galena oxidation by temperature and oxide concentration

本文通过采用FeCl3作氧化剂,在pH值为2、温度50℃和25℃时对不同浓度氧化介质中方铅矿进行氧化试验,试验采用水浴法,用原子吸收仪分析其中铅离子的含量,EDTA容量法测定全铁含量。通过试验计算出反应速率常数与反应级数、反应活化能,并确定反应动力学方程。分析温度和氧化介质浓度对方铅矿氧化速率的影响,介质浓度为600mg/l、温度为25℃时,氧化效果较好。而在50℃时,由于副反应中Fe(OH)3沉淀的生成,阻碍氧化反应进行。

In this thesis, a series of oxidation experiments on galena are conducted under different condition such as pH is 2, temperature is 50℃ and 25℃. The concentration of Pb （ Ⅱ ） is determined by atom absorb spectrometer （AAS）. After the experiment is completed, the solution is isolated from the residual ore samples and the concentration of Fe （Ⅲ） is assayed by EDTA volumetric method. The rate constant, reaction order, reaction reaction rate and energy of activation are also analyzed and computed. The effects of temperature and oxidized medium on lead ore oxidation speed were studied. Under the condition of 50℃ and 25℃, The rate of oxidation reaction is increase when concentration is different. But the effct is better when concentration is 600 mg/1 at 25℃, and the oxidation reaction is slow with the formation of the Fe （OH）3 at 50℃.