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Method for preparing coke by co-coking calcium ferrite and non-coking coal
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A calcium ferrite and co-coking technology, applied in coke ovens, special forms of dry distillation, petroleum industry, etc., can solve the problems of increasing ash content, less coking coal, unbalanced distribution, etc., to improve quality, improve coke strength, and reduce ash content. Effect
Active Publication Date: 2020-02-18
SICHUAN UNIV
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Summary
Abstract
Description
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Problems solved by technology
[0004] my country is rich in coal resource reserves, among which coking coal resources account for about 37% of the coal resource reserves, and the variety is complete, but the distribution is very uneven. Coal and coking coal account for less than 30%, high-quality, easy-to-select coking coal is less, and it is concentrated in North China, and the contradiction between resource distribution and reserves that do not match demand is more prominent
However, the binders used in the current shaped magnesium coking cannot reduce the ash content of the coke, and even increase the ash content in the coking process
Method used
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Examples
Experimental program
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Effect test
Embodiment 1
[0029] (1) Weigh 14g of calcium ferrite and add water to make pellets, the diameter of the pellets is 17mm, and the water content of the pellets is 10%;
[0030] (2) 140 g of non-coking coal (with a moisture content of 8%) was evenly wrapped on the outside of calcium ferrite pellets to form pellets with a diameter of 60 mm.
[0031] (3) Place non-coking coal calcium ferrite pellets in a simulated coke oven (tube furnace).
[0032] (4) Heat to 900°C without air, and the coking time is 17h.
[0033] (5) Extinguish the coke and take out the product.
[0034] (6) The calculated coking rate is 67%, and the coke mechanical strength is tested, wherein M40 is 73%, M10 is 9.5%, and the coke ash content is 5.7wt.%.
Embodiment 2
[0036] (1) Weigh 14g of calcium ferrite and add water to make pellets, the diameter of the pellets is 17mm, and the water content of the pellets is 10%;
[0037] (2) 140 g of non-coking coal (with a moisture content of 8%) was evenly wrapped on the outside of calcium ferrite pellets to form pellets with a diameter of 60 mm.
[0038] (3) Place non-coking coal calcium ferrite pellets in a simulated coke oven (tube furnace).
[0039] (4) Heating to 1100°C without air, and the coking time is 17h.
[0040] (5) Extinguish the coke and take out the product.
[0041] (6) The calculated coking rate is 73%, and the mechanical strength of the coke is tested, wherein M40 is 85%, M10 is 6%, and the ash content of the coke is 2.4wt.%.
Embodiment 3
[0043] (1) Weigh 14g of calcium ferrite and add water to make pellets, the diameter of the pellets is 17mm, and the water content of the pellets is 10%;
[0044] (2) 140 g of non-coking coal (with a moisture content of 8%) was evenly wrapped on the outside of calcium ferrite pellets to form pellets with a diameter of 60 mm.
[0045] (3) Place non-coking coal calcium ferrite pellets in a simulated coke oven (tube furnace).
[0046] (4) Heat to 1300°C without air, and the coking time is 17h.
[0047](5) Extinguish the coke and take out the product.
[0048] (6) The calculated coking rate is 75%, and the mechanical strength of the coke is tested, wherein M40 is 86%, M10 is 5%, and the ash content of the coke is 2.2wt.%.
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Abstract
The invention discloses a method for preparing coke by co-coking calcium ferrite and non-coking coal. The invention belongs to the technical field of production of coke from coal briquettes prepared by using chemical byproducts as binders. The method comprises the following steps: pelletizing the calcium ferrite, coating the non-coking coal outside calcium ferrite pellets to form large pellets, and heating the large pellets to 900-1300 DEG C under the condition of air isolation for coking to obtain the coke. According to the invention, the calcium ferrite is used as a binder, and the calcium ferrite and ash in the non-coking coal are combined in the coking process to generate Fe2O3-CaO-SiO2-Al2O3 quaternary composite calcium ferrite (SFCA), so that the ash content of the coke can be effectively reduced, the strength of the coke can be improved, and the quality of the coke can be improved.
Description
technical field [0001] The invention belongs to the technical field of using chemical by-products as binders to manufacture molded coal to produce coke, and in particular relates to a method for co-coking calcium ferrite and non-coking coal to prepare coke. Background technique [0002] According to the current national standard of coal classification in my country, coal is divided into three categories: anthracite, bituminous coal and lignite according to the degree of coalification. Coal and 1 / 2 medium caking coal and other coals are widely used in traditional coking, and can be collectively referred to as coking coal, and the rest of the weak and non-caking coal that cannot be coked in chamber coke ovens can be called non-coking coal. [0003] Blast furnace ironmaking requires high-strength coke, and a large amount of coking coal with strong caking properties must be used to produce high-strength coke. In 2017, my country's coking consumed about 570 million tons of coking...
Claims
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Application Information
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