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Method for preparing granular activated carbon from coal semicoke

A technology of granular activated carbon and semi-coke, which is applied in the field of coal semi-coke to prepare granular activated carbon, can solve the problems of large consumption of activator, time-consuming, large energy consumption, etc., so as to reduce production costs and equipment maintenance costs, reduce consumption, and reduce The effect of energy consumption

Active Publication Date: 2020-11-20
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Physical activation temperature requirements are generally high, time-consuming, and consume a lot of energy; while the activated carbon obtained by chemical activation has a well-developed pore structure, but the consumption of activators is large, and it is highly corrosive to equipment, making it difficult to produce activated carbon on a large scale.

Method used

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  • Method for preparing granular activated carbon from coal semicoke
  • Method for preparing granular activated carbon from coal semicoke

Examples

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preparation example Construction

[0030] Such as figure 1 As shown, the present embodiment provides a kind of preparation method of activated carbon, comprising steps:

[0031] S1 pretreatment step, the coal semi-coke raw material is made into semi-coke particles, and the semi-coke particles and potassium carbonate are made into a granular mixture; S2 activation step, the pre-treated particles are heated to a preset temperature under the protection of an inert gas After T, water vapor is passed through to activate; S3 post-treatment step, pickling and drying the mixture treated in the activation step to obtain granular activated carbon.

[0032] In this embodiment, potassium carbonate and semi-coke particles are used for chemical activation. Compared with potassium hydroxide commonly used in the prior art, potassium carbonate is less corrosive and less costly, which not only reduces the maintenance cost of activation equipment , and reduces the cost of use, enabling large-scale production of activated carbon....

Embodiment

[0046] Example ①: 10-20 mesh coal semi-coke particles obtained by crushing and screening and potassium carbonate powder with a mass ratio of 0.2 were fully impregnated for 12 hours, and then dried at 120° C. for 4 hours. The pretreated particles were sent to the activation furnace, and the temperature was raised to 800°C at a rate of 10°C / min under the protection of nitrogen, and the activation temperature was 800°C, and the water vapor mass ratio was 1.2 for joint activation for 1 hour. Reduce to normal temperature, pickle with dilute hydrochloric acid and dry to obtain activated carbon products. The yield of the activated carbon product is 47.1%, and the specific surface area is 671.7m 2 / g, iodine value 825.9mg / g, phenol adsorption value 105.2mg / g. In addition to being applied to the adsorption of pollutants in water, the product has also achieved good results in flue gas desulfurization. 2 The adsorption capacity was 31.2 mg / g.

[0047] Example ②: The 10-20 mesh coal se...

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Abstract

The invention relates to a preparation method of activated carbon, which comprises the following steps: a pretreatment step: preparing a coal semicoke raw material into semicoke particles, and preparing the semicoke particles and potassium carbonate into a granular mixture; an activation step: heating the granular mixture obtained in the pretreatment step to a preset temperature T under the protection of inert gas, and activating in a water vapor environment; and a post-treatment step: carrying out acid washing and drying on the granular mixture treated in the activation step to obtain the granular activated carbon. The preparation method of the activated carbon provided by the invention adopts a physical activation and chemical activation combined activation process, so that the energy consumption can be reduced, the consumption of a chemical activator can be greatly reduced, the corrosion to equipment is reduced, the maintenance cost of the equipment is reduced, and the quality of the activated carbon can be ensured.

Description

technical field [0001] The invention relates to the technical field of carbon material preparation, in particular to a method for preparing granular activated carbon from coal semi-coke. Background technique [0002] In recent years, in the fields of flue gas treatment and wastewater purification, the adsorption method has been widely used because of its simple operation and low cost. Among them, activated carbon has attracted much attention as a solid adsorbent with stable physical and chemical properties and excellent adsorption performance. There are many sources of raw materials for the preparation of activated carbon, such as coal, fruit shells, wood and other organic materials. Compared with other raw materials, my country has abundant coal resources, and the output of concentrated development is huge. The coal semi-coke obtained in the process of coal conversion is cheap, and it is often burned directly. In some places, it is even discarded as waste, which has caused...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/318C01B32/324C01B32/336C01B32/348C01B32/354
CPCC01B32/318C01B32/324C01B32/348C01B32/336C01B32/354
Inventor 骆仲泱周健生王勤辉方梦祥
Owner ZHEJIANG UNIV
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