考察了辉钼矿在微波场中的升温行为,探究了物料量、物料厚度以及微波功率对辉钼矿升温行为的影响。研究结果表明,辉钼矿具有良好的微波吸收性能,其升温过程可分为3个阶段;物料在微波场中升温与微波功率呈正比,而与物料厚度和物料量成反比。在本试验范围内,微波功率0.5 k W条件下,18 min后可将130 g辉钼矿加热至800℃。由焙烧产品的表征结果可知,本试验得到了特征良好的焙烧产品;微波氧化焙烧辉钼精矿制备高纯度三氧化钼是可行的。
The technology that waste activated carbon after extracting gold is regenerated with steam under microwave heating was studied.The influence of the activation temperature,activation duration and steam flow rate on iodine adsorption value and regeneration yield of activated carbon was investigated.The response surface methodology(RSM) technique was utilized to optimize the process conditions.The optimum conditions for the preparation of activated carbon are identified to be activation temperature of 831 °C,activation duration of 40 min and steam flow rate of 2.67 mL/min.The optimum conditions result in an activated carbon with an iodine number of 1048 mg/g and a yield of 40%,and the BET surface area evaluated using nitrogen adsorption isotherm is 1493 m2/g,with total pore volume of 1.242 cm3/g.And the pore structure of activated carbon regenerated is mainly composed of micropores and a small amount of mesopores.
