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Preparation method of walnut shell-doped sludge activated carbon

A sludge activated carbon and walnut shell technology, which is applied in the field of one-step carbonization and activation to prepare sludge activated carbon, to achieve the effect of increasing micropore volume, stabilization and developed pores

Inactive Publication Date: 2015-04-08
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Strontium sulfate is the main component of natural ore celestite, which can be used as an additive in the production of ceramics, cement, etc., but there is no research report on the use of strontium sulfate in the preparation of activated carbon

Method used

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  • Preparation method of walnut shell-doped sludge activated carbon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) Dry the excess sludge with a moisture content of 80.6% to a moisture content of 8% to obtain dry sludge; crush and sieve the dry sludge and walnut shells respectively to obtain sludge and walnuts with a particle size of 0.3 to 0.8mm For shell particles, take 9.00g of sludge particles and 1.00g of walnut shell particles, and mix them evenly.

[0016] (2) Add 0.02g of strontium sulfate powder to the sludge raw material doped with walnut shells obtained in step 1, and mix evenly.

[0017] (3) Add the raw material mixture obtained in step 2 into the zinc chloride solution and stir evenly, impregnate it at room temperature for 24 hours, and dry it for 24 hours at 80°C. The concentration of the zinc chloride solution used for impregnation is 2.0mol / L, and the impregnation mass ratio is 1:2.5.

[0018] (4) Put the intermediate product obtained in step 3 into a box-type resistance furnace, raise the temperature to 400° C. at a heating rate of 5° C. / min, and keep the temper...

Embodiment 2

[0022] (1) Dry the excess sludge with a moisture content of 80.6% to a moisture content of 10% to obtain dry sludge; crush and sieve the dry sludge and walnut shells respectively to obtain sludge and walnuts with a particle size of 0.3 to 0.8 mm For shell particles, take 8.00g of sludge particles and 2.00g of walnut shell particles, and mix them evenly.

[0023] (2) Add 0.04g of strontium sulfate powder to the sludge raw material doped with walnut shells obtained in step 1, and mix evenly.

[0024] (3) Add the raw material mixture obtained in step 2 into the zinc chloride solution and stir evenly to impregnate it for 24 hours at room temperature, and then dry it for 24 hours at 80°C. 1:2.5.

[0025] (4) Put the intermediate product obtained in step 3 into a box-type resistance furnace, raise the temperature to 500° C. at a heating rate of 10° C. / min, and keep the temperature constant for 60 minutes.

[0026] (5) After cooling the activated carbide obtained in step 4 to room ...

Embodiment 3

[0029] (1) Dry the excess sludge with a moisture content of 80.6% to a moisture content of 8% to obtain dry sludge; crush and sieve the dry sludge and walnut shells respectively to obtain sludge and walnuts with a particle size of 0.3 to 0.8mm For shell particles, take 7.00g of sludge particles and 3.00g of walnut shell particles, and mix the two evenly.

[0030] (2) Add 0.06g of strontium sulfate powder to the sludge raw material doped with walnut shells obtained in step 1, and mix evenly.

[0031] (3) Add the raw material mixture obtained in step 2 into the zinc chloride solution and stir evenly, impregnate it at room temperature for 24 hours, and dry it for 24 hours at 80°C. The concentration of the zinc chloride solution used for the impregnation is 3.0mol / L, and the impregnation mass ratio is 1:2.5.

[0032] (4) Put the intermediate product obtained in step 3 into a box-type resistance furnace, raise the temperature to 450° C. at a heating rate of 10° C. / min, and keep th...

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Abstract

The invention relates to a preparation method of walnut shell-doped sludge activated carbon for removing pollutants such as dye, phenols and metal ions in sewage. The technical scheme is that the preparation method comprises the following steps: drying excess sludge until the moisture content is 8-10%; crushing dry sludge and walnut shells respectively until the particle size is 0.3-0.8mm, and uniformly mixing the two at a mass ratio of (70-90):(10-30); adding strontium sulfate powder to obtain a raw material mixture; impregnating with a zinc chloride solution for 24 hours and drying; performing carbonization activation for 45-60 minutes at 400-500 DEG C; washing the product with hydrochloric acid, and washing with deionized water until the pH value is 6-8; and drying the product and grinding to obtain sludge activated carbon. In the method, with the walnut shells as a carburant, strontium sulfate as a catalyst and zinc chloride as an activator, sludge activated carbon is prepared by a one-step carbonization activation method, and harmless treatment of the sludge is realized; and obtained sludge activated carbon has abundant pores, a large specific surface area and a large adsorption value and is applicable to sewage treatment.

Description

technical field [0001] The invention relates to a preparation method of sludge activated carbon doped with walnut shells for removing dyes, phenols, metal ions and other pollutants in water. It uses surplus sludge as raw material, doped walnut shells to increase carbon content, and Strontium sulfate is used as a catalyst, zinc chloride is used as an activator, and a new method of preparing activated carbon from sludge is prepared by one-step carbonization activation. technical background [0002] The remaining sludge of urban sewage treatment plants is the main waste produced by sewage treatment plants. Sludge has become a potential source of pollution because it contains heavy metals, organic matter, pathogens, etc. With the advancement of urbanization in China, the urban population continues to expand, the amount of sewage generated continues to increase, and the amount of sludge generated by sewage treatment plants is also increasing. The disposal of sludge is becoming an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/12
Inventor 刘宇程陈菊陈明燕张波程齐暄
Owner SOUTHWEST PETROLEUM UNIV
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