Process for preparing binder-free formed activated carbon from waste biomass

A technology for forming activated carbon and waste biomass, which is applied in the direction of carbon compounds, inorganic chemistry, chemical instruments and methods, etc., can solve the problems of high preparation cost and poor forming performance of powder activated carbon binder, and achieve low cost and environmental friendliness Effect

Inactive Publication Date: 2018-10-23
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the current situation of high preparation cost of powder activated carbon and poor molding performance of powder activated carbon binder, the present invention

Method used

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  • Process for preparing binder-free formed activated carbon from waste biomass
  • Process for preparing binder-free formed activated carbon from waste biomass

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0026] Example 1

[0027] 1. Material preparation

[0028] Waste biomass is made of cotton stalks, which are dried and crushed to 80 meshes for use;

[0029] 2. Preparation of shaped activated carbon

[0030] 1) Mix cotton straw (dry basis) and water in a ratio of 1:5;

[0031] 2) After the mixture is transferred to the hydrothermal reactor, it is sealed;

[0032] 3) Heat the reaction kettle to 220°C for hydrothermal treatment, stop heating after 60min of hydrothermal treatment, and cool to room temperature naturally;

[0033] 4) The mixture in the reactor is subjected to centrifugal solid waste separation to obtain a solid product;

[0034] 5) After the solid product is dried at room temperature, it is thoroughly mixed with potassium hydroxide in a mass ratio of 1:2 (solid physical mixing);

[0035] 6) After mixing, hold for 1 min under the molding pressure of 5Mpa and demold (the cylinder is 2cm long and 1.5cm in diameter);

[0036] 7) The formed body is heated to 700°C at a temperature in...

Example Embodiment

[0041] Example 2

[0042] 1. Material preparation

[0043] Waste biomass is made of bamboo shavings and straws, which are dried and crushed to 80 meshes for use;

[0044] 2. Preparation of shaped activated carbon

[0045] 1) Mix bamboo chips (dry basis) and water in a ratio of 1:4;

[0046] 2) After the mixture is transferred to the hydrothermal reactor, it is sealed;

[0047] 3) The reaction kettle is heated to 250°C for hydrothermal treatment, and the heating is stopped after the hydrothermal treatment time is 40 minutes, and it is naturally cooled to room temperature;

[0048] 4) The mixture in the reactor is subjected to centrifugal solid waste separation to obtain a solid product;

[0049] 5) After the solid product is dried at room temperature, it is thoroughly mixed with potassium hydroxide in a mass ratio of 1:3 (potassium hydroxide is mixed into a solution), and dried at 80°C for 12 hours after mixing;

[0050] 6) After drying, it is demoulded after being held for 0.5min under the ...

Example Embodiment

[0054] Example 3

[0055] 1. Material preparation

[0056] Waste biomass is made of bamboo chips, which are dried and crushed to 80 meshes for use;

[0057] 2. Preparation of shaped activated carbon

[0058] 1) Mix bamboo chips (dry basis) and water in a ratio of 1:4;

[0059] 2) After the mixture is transferred to the hydrothermal reactor, it is sealed;

[0060] 3) The reaction kettle is heated to 250°C for hydrothermal treatment, and the heating is stopped after the hydrothermal treatment time is 40 minutes, and it is naturally cooled to room temperature;

[0061] 4) The mixture in the reactor is subjected to centrifugal solid waste separation to obtain a solid product and dried;

[0062] 5) After drying, hold for 0.5min under the molding pressure of 4Mpa and demold (the cylinder is 2cm long and 1.5cm in diameter);

[0063] 7) The molded body is heated to 800°C at a heating rate of 10°C / min in a nitrogen atmosphere, and then the nitrogen is changed to CO 2 , CO 2 The flow rate is 100cm 3 ...

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Abstract

Due to the characteristics of large specific surface area and controllable shape, formed activated carbon is applied in multiple fields such as food, medicines, chemical industry and environment protection. Existing formed activated carbon is mostly prepared from powdered activated carbon formed through a binder, but the powdered activated carbon is expensive, and the binder can cause the reduction of an adsorption effect of the formed activated carbon and the secondary pollution, so that the development of the cheap, green and environmental-friendly binder-free formed activated carbon has animportant practical significance. Waste biomasses are modified under the specific condition, and the binder-free formed activated carbon is prepared from the modified waste biomasses through a chemical or physical activation method. Compared with traditional formed activated carbon, the formed activated carbon prepared through the process adopts the waste biomasses as the raw materials without theneed for using the binder so as to have the advantages of simple preparation process, low cost, renewability, greenness, environment protection and the like.

Description

technical field [0001] The invention relates to the treatment and disposal of waste biomass, which belongs to the new technology of resource utilization of solid waste in the field of environmental protection and comprehensive utilization of resources, and is especially suitable for the resource utilization of high value-added waste biomass such as straw and bamboo chips in large quantities. Background technique [0002] Compared with powdered activated carbon, shaped activated carbon has controllable size and shape, higher bulk density and strength, and no dust pollution. At the same time, the high strength and processability of shaped activated carbon can meet the needs of multiple uses in different industries. In addition, shaped activated carbon is easy to recycle and regenerate. Due to its outstanding characteristics and broad application prospects, shaped activated carbon has received more and more attention, and has become a research hotspot at home and abroad. [0...

Claims

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Application Information

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IPC IPC(8): C01B32/324C01B32/348C01B32/354
CPCC01B32/324C01B32/348C01B32/354
Inventor 刘振刚马静
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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