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Novel process for preparing C-Fe shell-core magnetic active carbon by utilizing waste biomasses

A technology of waste biomass and magnetic activated carbon, which is applied in the field of resource utilization of waste biomass, and can solve problems such as in-situ incineration and environmental pollution

Inactive Publication Date: 2010-09-29
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Claims
  • Application Information

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Problems solved by technology

At present, except for a small amount of biomass used as fuel, a large amount is discarded or incinerated on site. The improper treatment of these waste biomass has caused serious environmental pollution.

Method used

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  • Novel process for preparing C-Fe shell-core magnetic active carbon by utilizing waste biomasses
  • Novel process for preparing C-Fe shell-core magnetic active carbon by utilizing waste biomasses

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Embodiment Construction

[0008] Mix sawdust with a mixed solution of ferric chloride and zinc chloride at a solid-to-liquid ratio of 1:5 (the mass ratio of sawdust, ferric chloride and zinc chloride is 20:1:10), and age at 60° C. for 6 hours. Then the obtained mixture was put into a cracking furnace, and under the protection of a nitrogen atmosphere, the heating rate was raised to 700° C. for cracking at a rate of 5° C. / min. The cracking time was 30 minutes. After the heating was stopped, it was naturally cooled to room temperature under the protection of nitrogen. The product obtained by the reaction is washed with dilute acid and deionized water respectively, and then dried to obtain the product.

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Abstract

The invention relates to a novel process for preparing magnetic active carbon with a C-Fe shell-core structure by utilizing waste biomasses. The process overcomes the defects of complicated preparation process, high cost and high price of the traditional shell-core active carbon, and by utilizing the form change of the waste biomasses in the presence of heating, the processes of carbonization, activation, magnetism giving and protection of the biomasses are achieved in one step. The key of the process lies in selecting an appropriate activating agent, controlling an appropriate carbonizing and heating system and carbonizing atmosphere and ensuring that the active carbon completely coats iron in the production process. The obtained active carbon has high specific surface area, pore volume and magnetic intensity and the C-Fe shell-core structure. Proved by experiments, after the active carbon is soaked in a 2M salpeter solution for 2h, the magnetism cannot be lost, and a product can be used in a strongly acidic solution.

Description

technical field [0001] The invention relates to the treatment and disposal of biomass waste, which belongs to the research and development of solid waste recycling technology in the field of environmental protection and resource comprehensive utilization, and is especially suitable for the resource utilization of a large amount of waste biomass produced in agriculture and forestry. Background technique [0002] Magnetic activated carbon with a protected magnetic center, that is, a core-shell structure, is a research hotspot in the field of activated carbon. It has important applications as a catalyst carrier and adsorbent in clean production, especially sewage treatment. Activated carbon with a shell-core structure can overcome the disadvantages of magnetic loss of general magnetic activated carbon in strong acidic solutions. At present, the preparation of this type of activated carbon is generally divided into several steps: first prepare activated carbon, introduce magnetis...

Claims

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Application Information

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IPC IPC(8): H01F1/09H01F1/00C01B31/08
Inventor 张付申刘振刚吴建芝
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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