A method for high-quality and harmless utilization of hyperaccumulator plants

Abstract

The invention discloses a high-quality harmless utilizing method of a hyperaccumulator. The high-quality harmless utilizing method comprises the following steps: smashing and drying the hyperaccumulator, and sieving through a sieve of which the density is 100 meshes; carbonizing at a carbonization temperature being 450 to 550 DEG C and in carbonization time being 25 to 35 minutes, thus obtaining acarbonized material; immersing the carbonized material by using an alkaline solution of which the mass percentage is 45 to 55 percent; drying at 90 to 120 DEG C for 10 to 15 hours after immersing for20 to 28 hours, thus obtaining an amorphous particulate carbon block; activating the amorphous particulate carbon block into an activated carbon coarse product under a nitrogen atmosphere, wherein the activating temperature is 750 to 850 DEG C, and the activation time is 25 to 35 minutes; drying for 10 to 15 hours, thus obtaining metal-containing activated carbon with a catalytic effect; grindingthe activated carbon, thus obtaining an activated product HA-AC; adding 5 to 15 percent of the activated carbon product HA-AC to biomass or other reaction raw materials; putting a swelled material ina supercritical reaction kettle, and carrying out sealing reaction at the reaction temperature being 380 to 600 DEG C and the reaction pressure being 22.1 to 30 MPa, thus obtaining a hydrogen-rich gas. The high-quality harmless utilizing method disclosed by the invention has the advantages that additional metal loading is not required, a complicated preparation technology and a longer preparationperiod are not required, heavy metal can be fully stabilized, and secondary pollution can be avoided.

Description

technical field [0001] The invention belongs to the technical field of deep processing and utilization of hyperaccumulator plants, and specifically relates to a high-quality and harmless hyperaccumulator plant (high-quality refers to the preparation of hyperaccumulator plants into supercritical water gasification reactions) Catalyst, detoxification refers to the method of utilization of heavy metals in super-enriched plants without secondary pollution). Background technique [0002] The hyperaccumulation phytoremediation (Pyhtoremetiation) technology of heavy metal polluted soil, also known as green remediation (Greenremediation), is based on the physiological function of plants to tolerate, decompose or overaccumulate certain or certain chemical elements, through the plant system and its Root system absorbs, volatilizes, or enriches the heavy metal pollutants in the soil environment, reduces the heavy metal content in the soil, and is an environmental pollution control tech...

AI Technical Summary

Problems solved by technology

Compared with the above catalysts, alkali catalysts such as KOH and NaOH have better catalytic effects on hydrogen production by gasification, but they often cause corrosion of the reactor tube wall; noble metal catalysts are 10 times more expensive than Ni-based catalysts Above, the large-scale application is limited; the catalyst prepared by activated carbon loaded with heavy metals has obvious catalytic effect, and has become a research hotspot, such as activated carbon loaded with Ni and Cu on H 2 and CH 4 The increase of the content has obvious catalytic effect, and strengthens the carbon gasification conversion during supercritical water gasification

At present, the methods for supporting metals on activated carbon mainly include impregnation method, supercritical technology, and microwave technology. The above-mentioned metal-loaded catalyst preparation processes require additional metals to be loaded through complex adsorption or impregnation and roasting processes, which consume a large amount of, Additional metal-containing materials also require a long preparation time, a long cycle and a large number of process steps; in addition, the used metal solution needs to be treated in order to avoid secondary pollution.

Therefore, there are many drawbacks and deficiencies mentioned above in this additional metal-loaded activated carbon preparation process.

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