微波焙烧磷矿湿法催化氧化脱硫反应条件优化  

Optimization of Reaction Conditions for Wet Catalytic Oxidation Desulfurization of Phosphate Rock Calcined by Microwave

作　　者：姜恩柱 姚梅 耿娜 余倩 徐朗 李慧 宁平[2] 贾丽娟 JIANG Enzhu;YAO Mei;GENG Na;YU Qian;XU Lang;LI Hui;NING Ping;JIA Lijuan(School of Chemistry and Environment,Yunnan Minzu University,Kunming 650500,China;Faculty of Environmental Science and Engineering,Kunming University of Science and Technology,Kunming 650500,China)

机构地区：[1]云南民族大学化学与环境学院,云南昆明650500 [2]昆明理工大学环境科学与工程学院,云南昆明650500

出　　处：《环境科学与技术》2022年第3期141-150,共10页Environmental Science & Technology

基　　金：国家自然科学基金(51968075,51968067);云南省教育厅科学研究基金(2020Y0259);云南民族大学2019年教学研究项目(2019-JWC-DC-74)。

摘　　要：该研究用微波加热技术对磷矿石预处理后进行脱硫,旨在考察微波加热技术对矿浆脱硫性能的强化作用。实验利用微波焙烧对原矿进行焙烧改性处理,考察了SO_(2)浓度为2 500 mg/m^(3)时,SO_(2)进气流量、浆液温度、固液比、氧含量对矿浆脱硫的效果,结果表明:(1)经微波焙烧改性后矿浆脱硫的最佳条件为:气流量500 mL/min,浆液温度40℃,固液比7∶400 (g/mL),氧含量5%。(2)对微波焙烧改性前后的磷矿浆脱除SO_(2)反应活化能进行计算,改性后活化能降低了12.6 kJ/mol,同比降低了37%,且改性后脱硫效率也显著提高。(3)对矿浆脱硫进行了响应面设计实验,结果表明浆液温度、固液比、氧含量各因素之间对脱硫率均存在交互影响,其中以固液比与氧含量的交互作用最为明显。The purpose of this study is to investigate the strengthening effect of microwave heating technology on the desulfurization performance of slurry.Firstly,the activation energy of SO_(2)removal before and after microwave modification was calculated.It was found that the activation energy of the reaction decreased significantly after microwave irradiation,and the method was feasible.The effects of SO_(2)inlet flow rate,slurry temperature,solid-liquid ratio,and oxygen content on the removal of SO_(2)from the slurry are investigated while the SO_(2)concentration is 2 500 mg/m~3.The results show that the optimal conditions of gas flow rate,slurry temperature,solid-liquid ratio,oxygen content for desulfurization of slurry via microwave roasting modification are 500 m L/min,40℃,7∶400 (g/mL) and 5% respectively.The activation energy of SO_(2)removal from phosphate rock slurry before and after microwave roasting modification was calculated.The activation energy decreased by 12.6 k J/mol,37%.Moreover,the desulfurization efficiency is also significantly improved after modification.The response surface design experiment was carried out on slurry desulfurization.And the results showed that the slurry temperature,solid-liquid ratio and oxygen content all have an interactive effect on the desulfurization rate,which the interaction between solid-liquid ratio and oxygen content is the most obvious.

关 键 词：磷矿 微波改性 催化氧化 湿法脱硫 交互影响 

分 类 号：X701[环境科学与工程—环境工程]