Calcified roasting-acid leaching process of vanadium from low-grade vanadium-containing stone coal

The low-grade vanadium-containing stone coal used in this experiment was collected from Wuxi Country, Chongqing City, China. The experiment focused on the vanadium recovery from roasted residue through optimizing the process conditions of an effective and environmentally-friendly technology, named calcified roasting-sulfuric acid leaching technology. By single-factor experiments and orthogonal experiments, the effects of roasting temperature, roasting time, sulfuric acid concentration and leaching time on the leaching ratio of vanadium were analyzed. The results showed that the leaching ratio of vanadium reached 85.5% under the proper technological conditions of roasting temperature=950℃, roasting time=4 h, 40% concentration of sulfuric acid and leaching time=6 h.

细颗粒物自动监测仪在高湿环境中仪器性能对比分析

2014年至2018年成都市平均相对湿度保持在70%以上,相对湿度常年较高,秋冬季节环境空气受颗粒物影响较大。为研究不同型号仪器在高湿环境下监测性能差异,2021年1月至3月,21台自动监测设备与3台手工监测进行为期88天的比对分析。监测时间段内,仪器T平行性最好,与手工监测数据相比,数据相对偏差较小,精密度更高,性能更加稳定,其次为BM仪器。校准膜重现性分析除WT仪器中的1台仪器无法满足要求,其余仪器均能满足。除WT仪器k值小于0.85,其余仪器均满足参比方法标准中斜率、截距、相关系数的要求,且斜率小于1,说明拟合度较高,且在监测过程中自动监测仪器监测数据较手工监测数据偏小可能性更高。