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Mixed steel slag coal-based columnar formed active coke for low-temperature flue gas denitrification and preparation method thereof

A technology of low-temperature flue gas and active coke, applied in separation methods, chemical instruments and methods, gas treatment, etc., can solve the problems of high cost and low efficiency, and achieve the effects of improving ignition point, reducing production cost and improving denitrification rate

Inactive Publication Date: 2020-12-08
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, activated coke also has problems such as high cost and low efficiency in the application of sintering flue gas denitrification.

Method used

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  • Mixed steel slag coal-based columnar formed active coke for low-temperature flue gas denitrification and preparation method thereof
  • Mixed steel slag coal-based columnar formed active coke for low-temperature flue gas denitrification and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Take the components and mass proportions of preparing 200 grams of the product of the present invention as an example:

[0029] Crush the steel slag and lignite into 3-8mm materials and wash them with deionized water, put them in a drying box and dry them at 105°C for 6 hours; use a planetary ball mill to grind the coal and steel slag for 30 minutes at 400r / min, Then grind for 30 minutes under the condition of 600 r / min; more than 95% of the ground coal powder and steel slag pass through a 200-mesh standard sampling sieve.

[0030] Fully mix 180g of coal powder and 20g of steel slag powder, that is, steel slag accounts for 10%. Add 125g of coal tar, 55g of glycerin and 70g of water and fully stir and knead, process the powder into a paste with better plasticity and then carry out extrusion molding. The prepared columnar active coke precursor was naturally air-dried at room temperature for 30 minutes; then the active coke precursor was dried in a drying oven at 155°C fo...

Embodiment 2

[0035] Take the components and mass proportions of preparing 200 grams of the product of the present invention as an example:

[0036] Crush the steel slag and lignite into 3-8mm materials and wash them with deionized water, put them in a drying box and dry them at 105°C for 6 hours; use a planetary ball mill to grind the coal and steel slag for 30 minutes at 400r / min, Then grind for 30 minutes under the condition of 600 r / min; more than 95% of the ground coal powder and steel slag pass through a 200-mesh standard sampling sieve.

[0037] Fully mix 180g of coal powder and 20g of steel slag powder, that is, steel slag accounts for 10%. Add 125g of coal tar, 55g of glycerin and 70g of water and fully stir and knead, process the powder into a paste with better plasticity and then carry out extrusion molding. The prepared columnar active coke precursor was naturally air-dried at room temperature for 30 minutes; then the active coke precursor was dried in a drying oven at 155°C fo...

Embodiment 3

[0042] Take the components and mass proportions of preparing 200 grams of the product of the present invention as an example:

[0043] Crush the steel slag and lignite into 3-8mm materials and wash them with deionized water, put them in a drying box and dry them at 105°C for 6 hours; use a planetary ball mill to grind the coal and steel slag for 30 minutes at 400r / min, Then grind for 30 minutes under the condition of 600 r / min; more than 95% of the ground coal powder and steel slag pass through a 200-mesh standard sampling sieve.

[0044] Fully mix 180g of coal powder and 20g of steel slag powder, that is, steel slag accounts for 10%. Add 125g of coal tar, 55g of glycerin and 70g of water and fully stir and knead, process the powder into a paste with better plasticity and then carry out extrusion molding. The columnar active coke precursor was naturally air-dried at room temperature for 30 minutes; then the active coke precursor was dried in a drying oven at 155°C for 20 minu...

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Abstract

The invention discloses mixed steel slag coal-based columnar formed activated coke for low-temperature flue gas denitrification and a preparation method thereof, and belongs to the field of metallurgical solid waste resource recycling and low-temperature flue gas denitrification treatment. The method comprises the following steps: screening and mixing crushed and ground steel slag and lignite; adding coal tar, glycerol and water according to a certain ratio, fully stirring the mixture, and kneading and treating the mixture to obtain paste with better plasticity, carrying out extrusion molding,and drying, carbonizing and activating the molded product to obtain the coal-based columnar molded active coke mixed with steel slag. Metallurgical solid waste steel slag is adopted to replace part of coal to prepare the coal-based activated coke mixed with the steel slag, the production cost of the activated coke is reduced, and high-added-value utilization of the waste steel slag can be improved; meanwhile, ferric oxide in the steel slag composition cooperates with active coke to catalyze and adsorb NO, so that the denitration rate is increased. The denitration rate of the mixed steel slagcoal-based columnar forming activated coke reaches 79%, and the desulfurization rate reaches 96%.

Description

technical field [0001] The invention belongs to the field of solid waste resources reuse and sintering flue gas treatment, and in particular relates to a mixed steel slag coal-based columnar shaped active coke prepared from metallurgical solid waste steel slag and lignite for low-temperature flue gas denitrification and a preparation method thereof. Background technique [0002] The NOx emission of sintering flue gas in iron and steel enterprises accounts for more than half of its total emission. The emission of sintering flue gas is unstable, the water content is high, the NOx emission fluctuates greatly, and the flue gas temperature is low, varying between 100-180°C. Mature vanadium-titanium SCR catalysts in thermal power plants are not fully suitable for flue gas denitrification in low-temperature and complex conditions of sintering flue gas. With the increasingly stringent environmental protection regulations, the urgent need for sintering flue gas NOx emission control in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C01B32/348C01B32/324B01D53/86B01D53/56
CPCB01J20/20C01B32/348C01B32/324B01D53/8625B01D2258/0283
Inventor 韩云龙杨小白纪杰钱付平
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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