Method for detecting trace metal elements in coke and application thereof

Abstract

The invention discloses an extraction method of trace metal elements in coke and an application. The extraction method comprises the following steps: taking coke to prepare a sample, uniformly stirring the sample, weighing the sample, putting the sample into a beaker, adding deionized water, performing uniform stirring, and standing for a plurality of hours; filtering the soaked coke soak solutionto ensure that no visible particulate matters exist in the filtrate; adding the filtrate into a volumetric flask, fixing the volume, adding a nitric acid solution, and performing uniform mixing to obtain a first to-be-detected solution; and drying the filter residues, performing ashing, carrying out mixed acid digestion treatment to obtain a second to-be-detected solution; and finally, respectively measuring the content of the target metal element by adopting an EDTA method and an inductively coupled plasma atomic emission spectrometry. The method can extract the metal elements in the coke, has the advantages of simple steps, short time consumption and high extraction efficiency, and can eliminate experiment interference by adopting deionized water.

Description

technical field [0001] The invention relates to the technical field of chemical analysis, in particular to a detection method and application of trace metal elements in coke. Background technique [0002] Most of the domestic long-process iron and steel complexes are equipped with coking plants. Generally, a large proportion or even all of them use self-produced coke, and the quality is relatively stable and controllable. The problem of trace metal elements in coke has attracted enough attention. There is also a lack of detection methods for trace metal elements in coke in the industry, and in the coking plant, due to desulfurization waste liquid, residual ammonia water in the coking process, denitrification waste liquid, scaling washing water of power generation boilers, biochemical dephenolization water, etc. directly enter the coke quenching pool , Participate in water coke quenching operations, the complex process leads to the final coke containing a variety of metal el...

AI Technical Summary

Problems solved by technology

There is also a lack of detection methods for trace metal elements in coke in the industry, and in the coking plant, due to desulfurization waste liquid, residual ammonia water in the coking process, denitrification waste liquid, scaling washing water of power generation boilers, biochemical dephenolization water, etc. directly enter the coke quenching pool , participate in the water coke quenching operation, the complex process leads to the final coke containing a variety of metal elements, which affects the quality of the coke

Most of the detection technologies for coke in the prior art only focus on the detection of soluble metal ions on the surface of coke, but do not propose an accurate and quantitative detection technology for the total content of specific trace metal elements in coke

[0003] Coke is widely used as smelting fuel in metallurgical enterprises. Coke containing a variety of trace metal elements such as K, Na, Ca, Mg, and Zn, after the metal ions are vaporized after being heated in the upper part of the blast furnace, the carbon dissolution loss of coke will react positively. Catalysis, that is, to promote the gasification reaction of charcoal, resulting in a decrease in coke strength, thereby weakening the skeleton role of coke in the blast furnace, and the enrichment of some metal ions in the blast furnace will aggravate the disastrous expansion and majority sintering of pellets Medium-temperature reduction pulverization of ore, lower iron ore reflow temperature, etc., resulting in poor air permeability of blast furnace, increased pressure difference, fluctuations in furnace conditions and even abnormal furnace conditions