磷尾矿中有机质含量检测方法优选研究OA

The accurate determination of organic matter content in phosphate tailings is of great significance for its resource utilization.In this paper,the phosphate tailings of an enterprise in Yunnan Province were taken as the research object.The difference of organic matter content in the phosphate tailings was determined by loss on ignition method,potassium dichromate volumetric method and total organic carbon(TOC)analyzer,and the best detection method was selected.The results show that the measured value of organic matter content by loss on ignition method(5.24％-8.27％)is significantly higher than that by potassium dichromate volumetric method and TOC analyzer,and the measured results are statistically significant(P＜0.05),which are lower than the limit value(2％)in GB 18599-2020"General Industrial Solid Waste Storage and Landfill Pollution Control Standard".The measurement error of the loss on ignition method is due to the mass loss caused by the decomposition of non-organic matter(such as CO32-decomposition to CO2).The TOC analyzer has a low determination result due to the loss of volatile organic carbon during the drying process.The potassium dichromate volumetric method does not have the above problems.Therefore,before the comprehensive utilization of phosphate tailings,it is recommended to give priority to the deter-mination of organic matter content by potassium dichromate volumetric method.