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研究用Na2SO3溶液从硒碲富集物中浸出硒的动力学。该硒碲富集物的微观形貌主要为球状体和柱状体,其粒径范围为17.77～56.58μm,且其主要成分为41.73%Se和40.96%Te。研究Na2SO3浓度(126～315 g/L)、搅拌速度(100～400 r/min)、反应温度(23～95°C)、液固比(7:1～14:1)及硒碲富集物平均粒径(17.77～56.58μm)对Se浸出率的影响。结果表明:增加Na2SO3浓度、提高搅拌速度、升高反应温度和增加液固比均可以提高Se浸出率,而增大硒碲富集物的粒径会导致Se的浸出率降低;反应温度对Se浸出率影响较大,当反应温度从23°C升高至95°C时,Se浸出率从21%增至67%;该浸出过程符合Avrami模型,其模型特征参数和表观活化能分别为0.235和20.847kJ/mol。
Kinetics of Selenium Leaching from Selenium Tellurium Concentrate with Na2SO3 Solution. The microscopic morphology of the selenium tellurium enrichment mainly spherical and columnar, the particle size range of 17.77 ~ 56.58μm, and its main components are 41.73% Se and 40.96% Te. The effects of Na2SO3 concentration (126-315 g / L), stirring speed (100-400 r / min), reaction temperature (23-95 ° C) Effect of Average Particle Size (17.77 ~ 56.58μm) on Se Leaching Rate. The results showed that increasing the concentration of Na2SO3, increasing the stirring speed, increasing the reaction temperature and increasing the liquid-solid ratio both increased the leaching rate of Se, while increasing the particle size of Se-tellurium enrichment led to the decrease of the leaching rate of Se. The leaching rate was greatly affected. When the reaction temperature increased from 23 ° C to 95 ° C, the leaching rate of Se increased from 21% to 67%. The leaching process was in accordance with the Avrami model. The model parameters and apparent activation energies were 0.235 and 20.847 kJ / mol.