Method for preparing activated carbon used for flue gas demercuration

Abstract

The invention relates to a method for preparing activated carbon, in particular to the method for preparing the activated carbon used for flue gas demercuration. The method is characterized by comprising the following steps of: preparing feed coal, and performing anoxybiotic dry distillation, milling, stirring while adding coal tar, extrusion molding, carbonization, activation, milling and dipping on the feed coal to obtain finished products. The method for preparing the activated carbon used for the flue gas demercuration has the advantages of unique process, high technical indexes of produced products and wide application range.

Description

technical field

[0001] The invention relates to a method for preparing activated carbon, in particular to a method for preparing activated carbon for removing mercury from flue gas. Background technique

[0002] Mercury is one of the most volatile heavy metal elements in coal. Due to its high toxicity, accumulation, and long residence time in the atmosphere, mercury pollution is obviously harmful to human health and the environment. Mercury and its compounds can pass through the respiratory tract, skin, etc. Mercury infiltrates into the human body through different channels such as the digestive tract, causing neurotoxicity and deep tissue lesions. Therefore, if the mercury in coal combustion smoke cannot be eliminated in time, it will cause great harm to human health and the environment.

[0003] At present, the production method of flue gas demercury activated carbon is raw coal→grinding→adding coal tar and stirring→extrusion forming→carbonization→activation→milling, and t...

Examples

Embodiment Construction

[0019] The raw material coal selection is Taixi anthracite with 7.64% moisture, 5.30% ash, 8.59% volatile matter and 78.47% fixed carbon. The weight ratio is: coal powder: tar: water=69-73%: 22- 25%: 5-7%, at a temperature of 300-400°C and a dry distillation time of 40 minutes, anaerobic dry distillation is performed in a calciner. After anaerobic dry distillation, the volatile content of raw materials reaches 5-7%, and then enters the mill Grinding in the machine, the particle size after grinding is 0.075mm ≥ 90%, add coal tar and stir in the tar dehydration tank, enter the kneader for kneading, enter the extruder for extrusion molding, enter the carbonization furnace for carbonization, and enter the activation furnace for activation. Grinding into the mill, the particle size after grinding is 0.045mm ≥ 90%, impregnating into the impregnation equipment, at this time, the amount of calcium bromide loaded is ≥ 0.5% of the raw material content, and finally the finished product, t...

technical field

[0001] The invention relates to a method for preparing activated carbon, in particular to a method for preparing activated carbon for removing mercury from flue gas. Background technique

[0002] Mercury is one of the most volatile heavy metal elements in coal. Due to its high toxicity, accumulation, and long residence time in the atmosphere, mercury pollution is obviously harmful to human health and the environment. Mercury and its compounds can pass through the respiratory tract, skin, etc. Mercury infiltrates into the human body through different channels such as the digestive tract, causing neurotoxicity and deep tissue lesions. Therefore, if the mercury in coal combustion smoke cannot be eliminated in time, it will cause great harm to human health and the environment.

[0003] At present, the production method of flue gas demercury activated carbon is raw coal→grinding→adding coal tar and stirring→extrusion forming→carbonization→activation→milling, and t...

Examples

Embodiment Construction

[0019] The raw material coal selection is Taixi anthracite with 7.64% moisture, 5.30% ash, 8.59% volatile matter and 78.47% fixed carbon. The weight ratio is: coal powder: tar: water=69-73%: 22- 25%: 5-7%, at a temperature of 300-400°C and a dry distillation time of 40 minutes, anaerobic dry distillation is performed in a calciner. After anaerobic dry distillation, the volatile content of raw materials reaches 5-7%, and then enters the mill Grinding in the machine, the particle size after grinding is 0.075mm ≥ 90%, add coal tar and stir in the tar dehydration tank, enter the kneader for kneading, enter the extruder for extrusion molding, enter the carbonization furnace for carbonization, and enter the activation furnace for activation. Grinding into the mill, the particle size after grinding is 0.045mm ≥ 90%, impregnating into the impregnation equipment, at this time, the amount of calcium bromide loaded is ≥ 0.5% of the raw material content, and finally the finished product, t...