Method for determining cadmium and trace lead in iron ore

Abstract

The invention discloses a method for determining cadmium and trace lead in an iron ore. The method comprises the following steps: digesting an iron ore sample by virtue of a microwave digestion apparatus, and determining a test solution by virtue of an atomic absorption spectrometer of a graphite furnace, wherein the microwave digestion comprises the following processes: putting dried iron ore into a polytetrafluoroethylene digestion tank, wetting with deionized water, and adding nitromurlatic acid; after sharp reaction is ended to obtain a mixture, putting the mixture into a furnace cavity of the microwave digestion apparatus, setting the digestion temperature to 190 DEG C, the heating time to 20 minutes, and digestion keeping time to 20 minutes; after the digestion is ended, cooling to a room temperature, taking out the digestion tank, and taking out the sample in the tank; and adding water to be in constant volume, so as to obtain a to-be-tested solution of the sample. According to the method, the sample can be completely digested by virtue of a microwave digestion method; the detection result is consistent with those of other methods under the condition that a base modifier is not added; and the method has the advantages of being simple, rapid, and accurate, and is suitable for determination of the cadmium and the trace lead in the iron ore.

Description

technical field [0001] The invention belongs to the technical field of physical and chemical testing, in particular to a method for measuring cadmium and trace lead in iron ore. Background technique [0002] As the basic raw material of the iron and steel industry, iron ore has diverse mineral composition and complex chemical composition. Both trade relations and metallurgical requirements are very concerned about its composition. Toxic and harmful elements such as lead, arsenic, cadmium, mercury, fluorine and chlorine in iron ore not only affect the quality of smelting equipment and products, but also pollute the surrounding environment and threaten human health. Based on factors such as environmental protection and the protection of smelting equipment by smelting enterprises, the ferrous metallurgy industry standard formulated the limit standard of harmful elements in iron ore in 2014. There are many detection standards for lead, arsenic and other elements in iron ore, ma...

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Problems solved by technology

Among these methods, the ICP-MS method is expensive, and the cost incurred in the use process is too high, and it is difficult to popularize it in domestic production and testing enterprises

Although flame atomic absorption method and inductively coupled plasma emission spectrometry are simple to operate, the cadmium content in iron ore is relatively low, and the sensitivity of these two methods cannot meet the requirements

Zhang Li et al. used hydride generation-atomic fluorescence spectrometry to measure. Although the detection limit is relatively low, the preparation of mercapto cotton is cumbersome and the process is complicated.

At present, there is no report on the determination of cadmium in iron ore by graphite furnace atomic absorption method

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