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Method for preparing sludge-based formed magnetic active carbon

A technology of magnetic activated carbon and sludge activated carbon, applied in chemical instruments and methods, alkali metal oxides/hydroxides, inorganic chemistry, etc., can solve the scarcity of magnetic activated carbon technology, few reports on preparation technology, and low preparation cost And other problems, to achieve good application prospects, a wide range of sources, good wear resistance effect

Active Publication Date: 2014-01-22
FUJIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In summary, at present, relevant literature and reports on shaped activated carbon and magnetic activated carbon are relatively common, but there are few reports on the preparation technology of combined magnetization and forming technology to prepare shaped magnetic activated carbon, especially the preparation cost is low and the strength is high. , The technology of forming magnetic activated carbon with good magnetic properties is even scarcer

Method used

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preparation example Construction

[0018] A kind of preparation method of sludge-based shaped magnetic activated carbon of the present invention, it specifically comprises following operation steps:

[0019] (1) Sludge carbonization activation treatment: Air-dry the sludge, crush and grind it, and pass through a 100-200 mesh sieve to get the dry sludge; weigh 100 parts by weight of the dry sludge and mix it with an activator with a concentration of 1-3mol / L according to Mix evenly with a liquid-solid ratio of 1 to 3:1, then heat in a water bath at 65 to 95°C for 1 to 3 hours, and stir during the heating process, then bake in an oven at 85 to 105°C for 16 to 24 hours. Then transfer the sludge obtained after drying into the crucible, place the crucible in a tubular resistance furnace for pyrolysis and activation for 0.5-2.5 hours, take it out after cooling, and clean and pyrolyze it with HCl with a concentration of 2-5mol / L. The product is washed 3 to 5 times, then repeatedly washed with distilled water until the...

Embodiment 1

[0027] Sludge carbonization activation treatment: Air-dry and crush the sludge, and pass through a 100-mesh sieve to get the dry sludge; weigh 20g of dry sludge and ZnCl with a concentration of 1mol / L 2 The solution was mixed uniformly according to the liquid-solid ratio of 1:1, then heated in a water bath at 65°C for 1 hour, and stirred during the heating process, then placed in an oven at 85°C for 24 hours, and then dried The sludge was transferred into the crucible, and the crucible was placed in a tubular resistance furnace (using nitrogen as a protective gas, with an initial temperature of 550°C and a heating rate of 20°C / min) for 2.5 hours of pyrolysis activation, and took it out after cooling. Wash the pyrolysis product with HCl with a concentration of 2 mol / L for 3 times, then repeatedly wash with distilled water until the pH is 6, then dry the washed pyrolysis product at 75°C until constant weight, and finally pass through a 100-mesh sieve to obtain Powdered sludge ac...

Embodiment 2

[0033] Sludge carbonization activation treatment: Air-dry and crush the sludge, and pass through a 100-mesh sieve to obtain dry sludge; weigh 20g of dry sludge and KOH solution with a concentration of 3mol / L and mix them evenly according to the liquid-solid ratio of 3:1, and then place Heated in a water bath at 95°C for 3 hours, and stirred during the heating process, then placed in an oven at 105°C for 16 hours, then transferred the sludge obtained after drying into a crucible, and placed the crucible in a tube Pyrolysis activation in a resistance furnace (using nitrogen as protective gas, initial temperature of 750 °C, and heating rate of 40 °C / min) for 0.5 h, after cooling, take it out, and wash the pyrolysis product with 5 mol / L HCl 5 Repeated washing with distilled water until the pH is 7, then drying the washed pyrolysis product at 85°C until constant weight, and finally passing through a 200-mesh sieve to obtain 10.36g of powdered sludge activated carbon;

[0034] Sludg...

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PUM

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Abstract

The invention provides a method for preparing sludge-based formed magnetic active carbon. The method comprises the steps as follows: sludge is used as a raw material, an activating agent is added for carbonizing and activating the sludge; nano-sized Fe3O4 is used as a magnetic source for magnetizing the sludge active carbon; and sodium carboxymethylcellulose and aluminum salt are composited to an organic-inorganic binding agent, the binding agent and a p-toluenesulfonhydrazide foaming agent are used for uniformly binding powdery magnetic active carbon into a formed magnetic active carbon precursor with abundant pore structures, and finally, the formed magnetic active carbon precursor is heated to obtain the sludge-based formed magnetic active carbon. According to the method, the sludge is used as a main raw material, the resource utilization of the sludge is achieved, the recycling is convenient, and reutilization can be achieved; and further, the sludge-based formed magnetic active carbon has a stable structure and good magnetic stability, and can be widely used in the fields such as sewage treatment, soil pollution treatment and the like.

Description

【Technical field】 [0001] The invention relates to a preparation method in the field of environmental protection, in particular to a preparation method of sludge-based shaped magnetic activated carbon. 【Background technique】 [0002] Activated carbon is a kind of porous material with large specific surface area, developed pore structure and strong adsorption capacity. It has strong adsorption capacity for gases, heavy metals in solution, organic matter, inorganic matter and colloidal particles, and chemical It is stable in nature, so it has a wide range of applications in environmental governance, defense industry, chemical industry, food industry and other industries. [0003] Commercial activated carbon mostly uses coal, wood and fruit shells as the main raw materials, but due to limited resources and technical limitations, the production and application costs of activated carbon are relatively high. For example, Chinese patent 02160182.8, its manufacturing cost is too high...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/28B01J20/30
Inventor 刘心中刘惠萍
Owner FUJIAN UNIV OF TECH
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