A method for the recovery of rare earth and energy substances from rare earth hyperaccumulator plants

Abstract

The invention discloses a method for recovering rare earth and energy substances from rare earth super-enriched plants, which is the method combining the technologies of mechanical crushing, vacuum pyrolysis sectional condensation and rare earth leaching precipitation, and can recover pyrolysis oil and pyrolysis gas generated by pyrolysis of biomass of rare earth super-enriched plant harvest through the vacuum pyrolysis sectional condensation technology; residues rich in rare earth elements are treated by adopting a leaching precipitation technology to obtain a mixed rare earth oxide; the residues after rare earth leaching can be used as the porous adsorption carbon material for reuse. Through the method disclosed by the invention, the high-value resource recovery of the rare earth hyper-enriched plant harvest is realized, the rare earth hyper-enriched plant biomass is converted into energy substances, the rare earth elements rich in the plant body are recycled, the harm of the rare earth hyper-enrichment plant to the environment is avoided, and the whole process is clean and environment-friendly, free from secondary production, simple in process and high in recovery efficiency, and has obvious economic benefit and environmental benefit.

Description

technical field [0001] The invention relates to the technical field of solid waste recycling, in particular to a method for recovering rare earth and energy substances from rare earth hyperaccumulation plants. Background technique [0002] my country is the country with the largest reserves of rare earths. As a strategic resource, rare earths are widely used in military, metallurgy, petrochemical and other fields. However, due to the lack of proper management of the environment during the rare earth mining process, the ecology of the surrounding areas of rare earth production areas has been severely damaged, which has caused serious impacts on human health. Therefore, some methods to control rare earth pollution have been developed. Among them, phytoremediation is widely used in the treatment of rare earth pollution because of its low cost and the advantages of protecting topsoil, reducing erosion and reducing soil loss after vegetation is formed. However, the repaired rare...

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Problems solved by technology

[0003] At present, there is no green treatment method for rare earth hyperaccumulator plants, and there is no full-value green recovery of rare earth hyperaccumulator plants

There are also many problems in the related treatment and recovery technology of hyperaccumulator plants. Patent CN108485692A prepares biochar from hyperaccumulator plant harvests into biochar and generates hydrogen-rich gas through crushing and sorting, carbonization, activation and other technical methods, but This technical method does not recycle the metal elements in the hyperaccumulator plant harvest, resulting in a waste of resources

Patent CN109794262A burns cadmium hyperaccumulated plant harvests into cadmium-containing biochar through a tube furnace under protective gas atmosphere, and prepares cadmium-containing biochar into carbon-loaded cadmium sulfide photocatalytic material through sulfidation reaction, but pyrolysis The pyrolysis oil and pyrolysis gas generated in the process have not been effectively treated and recovered, and exposure to the environment will cause environmental pollution and harm to the human body, and it is also a waste of resources

Patent CN110145749A adopts a safe incineration device to incinerate the harvested hyperaccumulator plants, and then treats the heavy metal tail gas, dust, sulfide and other harmful substances formed by incineration, realizing the safe reduction of hyperaccumulator plants, but Neither the biomass resources of the hyperaccumulator plant harvest nor the heavy metal resources rich in the body have been effectively recovered

Patent CN206966296U pyrolysis, leaching, purification, electrochemical deposition, oil and gas separation and other technologies convert the pyrolysis oil generated by the pyrolysis of super-enriched plants into gasified gas, and at the same time recover the heavy metals in super-enriched plants, but the pyrolysis process generates The pyrolysis gas has not been properly treated, and exposure to the environment will cause environmental pollution

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