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Method for preparing magnetic biochar from sludge

A biochar and sludge technology, which is applied in the fields of sludge treatment, pyrolysis sludge treatment, chemical instruments and methods, etc., can solve the problems of poor adsorption performance of biochar, high cost and complicated preparation process.

Pending Publication Date: 2019-10-11
浙江清风源环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The preparation process of this kind of biochar is more complicated, the cost is higher, and the adsorption performance of the obtained biochar is poor.

Method used

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  • Method for preparing magnetic biochar from sludge
  • Method for preparing magnetic biochar from sludge
  • Method for preparing magnetic biochar from sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] For pretreatment, add 1.5 L of FeCl with a concentration of 0.015 mol / L to 8.2 kg of sludge 3 solution and 0.6L of KOH solution with a concentration of 0.035mol / L, mix well.

[0034] Drying treatment, after pretreatment, the sludge passes through the mud storage hopper, is transported by the screw feeder, and enters the drying furnace. The drying temperature is controlled at 200°C and the sludge stays for 40 minutes. After drying, the moisture content of the sludge is about 16% for subsequent pyrolysis treatment.

[0035] Pyrolysis treatment, after drying, the sludge enters the pyrolysis furnace, the heating rate of the pyrolysis furnace is 10°C / min, the temperature rises to 800°C, stays in the pyrolysis furnace for 2 hours, and undergoes a series of cracking, dehydrogenation, and reduction reactions.

[0036] In the cooling stage, the product after pyrolysis treatment is cooled, specifically, it can be cooled by spiral water cooling equipment, and cooled to about 50°C...

Embodiment 2

[0038] For pretreatment, add 1.4 L of FeCl with a concentration of 0.018 mol / L to 8.8 kg of sludge 3 solution and 0.6 L of KOH solution with a concentration of 0.055 mol / L, and mix well.

[0039] Drying treatment, after pretreatment, the sludge passes through the mud storage hopper, is conveyed by the screw feeder, and enters the drying furnace. The drying temperature is controlled at 160°C and stays for 40 minutes. After drying, the moisture content of the sludge is about 18% for subsequent pyrolysis treatment.

[0040] Pyrolysis treatment. After drying, the sludge enters the pyrolysis furnace. The heating rate of the pyrolysis furnace is 15°C / min, and the temperature is raised to 850°C. It stays in the pyrolysis furnace for 2 hours and undergoes a series of cracking, dehydrogenation, and reduction reactions.

[0041] In the cooling stage, the product after pyrolysis treatment is cooled, specifically, it can be cooled by spiral water cooling equipment, and cooled to about 50...

Embodiment 3

[0043] For pretreatment, add 1.7 L of FeCl with a concentration of 0.020 mol / L to 9.8 kg of sludge 3 solution and 0.8L of KOH solution with a concentration of 0.060mol / L, mix well.

[0044] Drying treatment, after pretreatment, the sludge passes through the mud storage hopper, is transported by the screw feeder, and enters the drying furnace. The drying temperature is controlled at 200°C and the sludge stays for 40 minutes. After drying, the moisture content of the sludge is about 15% for subsequent pyrolysis treatment.

[0045] Pyrolysis treatment. After drying, the sludge enters the pyrolysis furnace. The heating rate of the pyrolysis furnace is 10°C / min, and the temperature is raised to 660°C. It stays in the pyrolysis furnace for 2 hours and undergoes a series of cracking, dehydrogenation, and reduction reactions.

[0046] In the cooling stage, the product after pyrolysis treatment is cooled, specifically, it can be cooled by spiral water cooling equipment, and cooled to ...

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Abstract

The invention discloses a method for preparing magnetic biochar from sludge. The method includes the following steps of adding a ferric salt solution and an alkaline solution to the sludge to preprocess the sludge, drying the preprocessed sludge to reduce the water content in the sludge, and conducting pyrolysis treatment on the dried sludge to obtain the magnetic biochar, wherein the pyrolysis treatment temperature is higher than 650 DEG C. By means of the method for preparing the magnetic biochar from the sludge, the ferric salt solution and the alkaline solution are introduced into the sludge preprocessing stage, then drying and pyrolysis are conducted to directly generate the magnetic biochar, and the magnetic biochar is easy and convenient to prepare. Due to the high pyrolysis temperature, the micro-pores in activated carbon can be further enriched in the pyrolysis process, the porosity of the biochar is increased, and the adsorption performance of the biochar is improved.

Description

technical field [0001] The invention relates to biochar, in particular to a method for preparing magnetic biochar from sludge. Background technique [0002] Magnetic biochar is a kind of biochar that has certain adsorption properties and is accompanied by the magnetic properties of the material itself. The advantage is that the biochar can be separated from other impurities more conveniently by using an external magnetic field after use. At present, the existing processes for preparing magnetic biochar and magnetic activated carbon are based on the biochar and activated carbon prepared by carbonization and activation, and use FeCl3 solution and NaOH solution to react to form Fe3O4 on the surface of the carbon material to achieve magnetization. the goal of. The preparation process of this kind of biochar is more complicated, the cost is higher, and the adsorption performance of the obtained biochar is poor. Contents of the invention [0003] In order to solve the above t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F11/00C02F11/10C02F11/13C01B32/318
CPCB01J20/06B01J20/20B01J2220/4887C02F11/00C02F11/10C02F2303/06C01B32/318C02F11/13Y02W10/40
Inventor 郑志永颜威张福鑫李峰
Owner 浙江清风源环保科技有限公司
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