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Process for preparing active carbon from chemical sludge

A technology for preparing activated carbon and chemical sludge, applied in sludge treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve problems such as secondary pollution, endangering the ecological environment, occupying farmland, etc., and achieve a good environment and social benefits, the effects of a wide range of sources

Inactive Publication Date: 2011-07-13
NANJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] The cost of chemical sludge incineration in my country is high, and many chemical companies turn to landfill or compost to dispose of the remaining sludge. Because the sludge contains a large amount of organic toxic substances, landfill or compost is likely to cause serious secondary pollution and endanger the ecological environment. Compost takes up a lot of farmland

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  • Process for preparing active carbon from chemical sludge

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Effect test

Embodiment 1

[0024] Take the residual sludge of a petrochemical plant with a mass moisture content of 75%, dry it at 120°C for 4 hours, weigh 100g of dried sludge, add 60mL of potassium hydroxide activation solution with a concentration of 3mol / L; soak and activate at 90°C for 4h, and then Stir at 120r / min while activating, dry (dry at 120°C for 5h), and grind until the average particle size is 0.71mm. Then pyrolyze at 700°C (heating rate: 15°C / min) and purge rate: 150mL / min under the protection of nitrogen for 3h. Cool, wash with 1mol / L hydrochloric acid, and dry; then wash with water, and dry to obtain activated carbon. The measured specific surface area is: 311m 2 / g, the leaching concentration of heavy metals is shown in Table 1.

Embodiment 2

[0026] Take the remaining sludge of a sewage treatment plant in a chemical industrial park with a moisture content of 80%, dry it at 110°C for 8 hours, weigh 100g of dried sludge, and add 25mL of potassium hydroxide and zinc chloride solutions with a concentration of 3mol / L respectively; Immerse and activate at 85°C for 6h, stir at 100r / min while activating, dry (dry at 110°C for 8h), and grind to an average particle size of 0.50mm. Then, pyrolyze for 2.5 hours at 650°C (heating rate: 10°C / min) and purging rate: 100mL / min under the protection of helium. Cool, wash with 0.8mol / L hydrochloric acid, and dry; then wash with water, and dry to obtain activated carbon. The measured specific surface area is: 365m 2 / g, the leaching concentration of heavy metals is shown in Table 1.

Embodiment 3

[0028] Take the residual sludge of a sewage treatment plant of a pesticide factory with a water content of 85%, dry it at 105°C for 16 hours, weigh 100g of dried sludge, add 100mL of potassium sulfide solution with a concentration of 1mol / L; soak and activate at 75°C for 8h, While activating at 60r / min, dry (dry at 105°C for 16h) and grind to an average particle size of 0.15mm. Then pyrolyze at 800°C (heating rate: 20°C / min) and purge rate: 180mL / min under argon protection for 5h. Cool, wash with 1.5mol / L hydrochloric acid, and dry; then wash with water, and dry to obtain activated carbon. The measured specific surface area is: 408m 2 / g, the leaching concentration of heavy metals is shown in Table 1.

[0029] Table 1 Analysis of heavy metal content in leaching solution in activated carbon leaching toxicity identification test

[0030]

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Abstract

The invention relates to a process for preparing active carbon from chemical sludge. Residual sludge generated in sewage treatment in the chemical industry is taken as a raw material; and the process comprises the following steps of: drying the sludge, and adding an activating agent for activation; drying, grinding, and carbonizing under the protection of inert gas; and cooling, washing and drying to obtain the sludge-based active carbon. A large amount of residual sludge generated in sewage treatment in the chemical industry is taken as the raw material and is prepared into the active carbon, so that the aims of changing waste into treasure and treating waste with waste are fulfilled, and the active carbon has obvious environmental and social benefits. In the prepared active carbon, the heavy metal concentration is lower than the maximum permissible steep concentration specified in the national standard GB 5085.3-2007 (Identification Standards for Hazardous Wastes-Identification for Extraction Toxicity); meanwhile, under the condition of high temperature pyrolysis, organic matters in the sludge can be completely mineralized. The active carbon prepared by the process has good environmental and social benefits.

Description

technical field [0001] The invention relates to resource disposal of industrial solid waste, in particular to a process for preparing activated carbon from chemical sludge. Background technique [0002] The sludge in the chemical industry is not only bulky, but also contains high organic poisons, fine particles, flocculent colloidal structure, and high hydrophilicity. There are more than 1,000 large and small chemical parks in my country, with more than 100,000 large and small chemical enterprises. These chemical companies produce tens of thousands of tons of excess sludge every day, and the water content of the sludge is as high as 95%. After the sludge is filtered by belt filter, the water content drops to 70-85%, because it contains various organic poisons and heavy metals. . . According to the latest "National Hazardous Waste List" promulgated by our country, the excess sludge generated in the process of wastewater treatment in chemical, pharmaceutical and pesticide i...

Claims

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Application Information

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IPC IPC(8): C01B31/12C02F11/00
Inventor 徐炎华胡俊钱斐斐
Owner NANJING UNIV OF TECH
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