A step-by-step extraction and identification method for the occurrence forms of heavy metals vanadium and nickel in petroleum coke

Abstract

The invention relates to a step-by-step extraction and identification method for a form of occurrence of heavy metal vanadium and nickel in petroleum coke, and the method comprises the following steps: an ion exchangeable state; a carbonate binding state; an iron manganese oxide bonding state, to be more specific, adding a glucose solution, a sodium oxalate solution and a nitric acid, ascorbic acid and citric acid mixed solution to residue B for leaching treatment to obtain residue C; a metalloporphyrin complex state, to be more specific, adding a dodecylbenzenesulfonic acid solution and a methanesulfonic acid solution to the residue C to obtain residue D; a non-porphyrin organic and sulfide bound state; and a residue lattice binding state. The step-by-step extraction and identification method has the beneficial effects that a specific form of occurrence of the heavy metal vanadium and nickel in the petroleum coke can be obtained, and an analysis basis for migration and transformationof the vanadium and the nickel in the process of combustion and gasification of the petroleum coke can be laid.

Description

technical field [0001] The invention relates to the field of identification of the occurrence forms of heavy metal elements, in particular to a method for stepwise extraction and identification of the occurrence forms of heavy metals vanadium and nickel in petroleum coke. Background technique [0002] Petroleum coke is the product of delayed coking of petroleum. The slagging and corrosion problems caused by the release of vanadium and nickel with gasification limit its wide application as a raw material for synthesis gas. Obtaining the original occurrence forms of vanadium and nickel in petroleum coke is of great significance for studying its gasification release characteristics and controlling and solving the problem of slagging corrosion. [0003] The currently published chemical reagent extraction methods such as tessier speciation method and BCR method were initially used to study the different occurrence forms of heavy metals in soil, and they were continuously improved...

AI Technical Summary

Problems solved by technology

Petroleum coke is a highly aromatized high-molecular carbide. Its physical and chemical properties are significantly different from those of soil. The high-concentration vanadium and nickel enriched in it are mainly free or associated with asphaltene in the form of metalloporphyrin and non-porphyrin organic matter. There are obvious differences in the forms of heavy metals in petroleum coke, and the forms of heavy metals in soil. Using traditional chemical extraction methods to identify forms in petroleum coke will have shortcomings such as incomplete extraction, serious channeling, and lack of specific morphological classification.

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