A method for recovering catalyst in coal catalytic gasification ash, and the catalyst recovered by the recovery method and its application

Abstract

The invention relates to the technical field of coal catalysis, in particular to a method for recovering a catalyst in coal catalytic gasification ash, and the catalyst recovered by the recovery method and its application. While the catalyst in the ash can be fully recovered, the catalytic activity of the catalyst can be improved, and the resource utilization of high value-added components such as aluminum, silicon, iron, titanium, and lithium rich in ash can be realized. A method for recovering catalyst in coal catalytic gasification ash, comprising: washing the coal catalytic gasification ash with water; using concentrated sulfuric acid to pickle the washed ash, and adding graphite and oxidant to the reaction product, so that the reaction product The carbon in the carbon and the added graphite undergo an oxidation reaction under the intercalation of sulfuric acid molecules and oxidants; the obtained graphite oxide is stripped to obtain graphene oxide, and the soluble catalyst is supported on the graphene oxide to desulfurize the liquid product treatment, and return the desulfurized alkali metal oxide and sulfuric acid solution for reuse.

Description

technical field [0001] The invention relates to the technical field of coal catalysis, in particular to a method for recovering a catalyst in coal catalytic gasification ash, and the catalyst recovered by the recovery method and its application. Background technique [0002] Catalytic gasification technology is an important way to cleanly and efficiently utilize coal. Using catalytic gasification technology, coal undergoes a gasification reaction with a gasification agent at a relatively low temperature under the catalysis of a catalyst to generate high-concentration methane. [0003] However, due to the high cost of the catalyst, it is usually necessary to recover the catalyst in the gasified ash to realize the recycling of the catalyst. In the prior art, the catalyst in the ash is usually recovered by a combination of washing and digestion, and the catalyst in the ash cannot be completely recovered, and fresh catalyst is often needed to maintain a good catalytic gas. chem...

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Problems solved by technology

[0004] In the prior art, if the catalyst in the ash is not recycled, most of the ash will be discarded and piled up, occupying a large amount of land and causing secondary pollution to the environment (dust, water pollution, etc.), and the ash is rich in High value-added components such as aluminum, silicon, iron, titanium, lithium, etc. are not effectively utilized, resulting in waste of resources

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