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Preparation method of magnetic activated carbon based on black liquor lignin and Fenton sludge

A technology of magnetic activated carbon and Fenton's sludge, applied in the direction of chemical instruments and methods, non-metallic elements, alkali metal oxides/hydroxides, etc., can solve the problems of poor strength and poor separation effect of activated carbon, and reduce the impregnation time , high strength performance, strong adsorption performance

Active Publication Date: 2020-07-28
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method of using black liquor lignin and Fenton sludge as raw materials to prepare magnetic activated carbon by one-step synthesis method. On the one hand, it solves the problems of poor separation effect and poor strength of commercial activated carbon. A New Approach to Efficient Utilization of Black Liquor Lignin and Fenton Sludge

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) The black liquor is extracted from the second effect of the five-effect evaporator in the eucalyptus kraft pulping process. The black liquor is acidified with flue gas and the pH is adjusted to 8.0. After flocculation, cleaning and concentration, the black liquor is obtained. Concentrated sample (solid content: 25.6%). The black liquor after acid analysis can be returned to the five-effect evaporator without further treatment, and there is no subsequent disposal problem. (2) Take the Fenton sludge in the neutralization tank, wash and concentrate to obtain a concentrated Fenton sludge sample (solid content: 32.6%). (3) KOH is used as the activator, and the concentrated black liquor lignin sample, the concentrated Fenton sludge sample and the activator are fully mixed and impregnated at a ratio of 1:1:2 (dry mass ratio). After 2 hours of immersion time, the impregnated The sample was dried (105° C.), and then the dried sample was ground to 30 mesh to obtain a ground ...

Embodiment 2

[0027] (1) The black liquor is extracted from the third effect of the five-effect evaporator in the poplar kraft pulping process. The black liquor is acidified with flue gas and the pH is adjusted to 8.5. After flocculation, cleaning and concentration, the black liquor lignin is obtained. Concentrated sample (solid content: 31.6%). The black liquor after acid analysis can be returned to the five-effect evaporator without further treatment, and there is no subsequent disposal problem. (2) Take the Fenton sludge in the neutralization tank, wash and concentrate to obtain a concentrated Fenton sludge sample (solid content: 35.1%). (3) KOH is used as the activator, and the black liquor lignin concentrated sample, the Fenton sludge concentrated sample and the activator are fully mixed and impregnated at a ratio of 4:1:8 (dry mass ratio). After 8 hours of immersion time, the impregnated The raw materials were dried in an oven (105° C.), and then the dried sample was ground to 40 mes...

Embodiment 3

[0029] (1) The black liquor is extracted from the second effect of the multi-effect evaporator in the wheat straw caustic soda pulping process. The black liquor is acidified with dilute sulfuric acid and the pH is adjusted to 7.5. After flocculation, cleaning and concentration, the black liquor lignin concentration is obtained. sample (solid content: 23.2%). The black liquor after acid analysis can be returned to the multi-effect evaporator without further treatment, and there is no subsequent disposal problem. (2) Take the Fenton sludge in the neutralization tank, wash and concentrate to obtain a concentrated Fenton sludge sample (solid content: 28.8%). (3) KOH was used as the activator, and the black liquor lignin concentrated sample, the Fenton sludge concentrated sample and the activator were fully mixed and impregnated at a ratio of 2:1:8 (dry mass ratio). After 4.5 hours of immersion time, the impregnated The finished raw material was put into an oven for drying (105° C...

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Abstract

The invention provides a preparation method of magnetic activated carbon based on black liquor lignin and Fenton sludge, comprising the following steps of: (1) acidifying, flocculating, cleaning and concentrating black liquor to obtain a black liquor lignin concentrated sample; (2) cleaning and concentrating the Fenton sludge to obtain a Fenton sludge concentrated sample; (3) fully mixing the black liquor lignin concentrated sample, the Fenton sludge concentrated sample and an activating agent according to a certain ratio, dipping for a period of time, and drying and grinding the dipped sampleto obtain a ground sample; (4) putting the ground sample into nitrogen for pyrolysis activation, activating for a period of time at a set activation temperature, and then naturally cooling to room temperature to obtain a pyrolysis sample; and (5) taking out the pyrolysis sample, respectively cleaning with dilute acid and water, and then carrying out low-temperature vacuum drying to obtain the magnetic activated carbon. The magnetic activated carbon prepared by the invention has the characteristics of strong adsorption performance, high magnetic separation effect and high strength.

Description

technical field [0001] The invention belongs to the technical field of activated carbon preparation, in particular to a method for preparing magnetic activated carbon based on black liquor lignin and Fenton sludge. Background technique [0002] Activated carbon is mainly prepared by pyrolysis and activation of carbonaceous raw materials such as wood, coal and petroleum. It has a high specific surface area, developed pore structure and rich surface functional groups, so it is widely used as an excellent adsorbent in many fields. Such as water treatment, catalyst carrier and food decolorization, etc. According to particle size, commercial activated carbon is mainly divided into granular activated carbon (>0.177mm) and powdered activated carbon (<0.177mm). Compared with granular activated carbon, powdered activated carbon has a larger surface area, so the adsorption performance is superior, but the separation is difficult. In addition, the price of commercial activated ...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/28B01J20/30C01B32/324C01B32/348
CPCB01J20/20B01J20/28009B01J20/28011C01B32/324C01B32/348B01J2220/4887
Inventor 张文晖朱荣耀陈丽群
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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