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Pellet binder with desulfurization function, preparation method and application thereof

A binder and pellet technology, which is applied in the field of pellet binder and its preparation, to achieve the effects of improving desulfurization efficiency, increasing decomposition temperature, and high heating efficiency

Active Publication Date: 2020-09-01
句容康泰膨润土有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The application adds urea to the mixture to release SO2 throughout the sintering process 2 Both can react with ammonia to improve the desulfurization effect; the method of partially discarding the dust removal ash reduces the difficulty of dust removal ash treatment and improves the treatment efficiency, but there is still room for further optimization of the desulfurization agent effect in this application

Method used

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  • Pellet binder with desulfurization function, preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The pellet binder with desulfurization function of this embodiment includes the following components in terms of mass percentage: 2.5-10wt.% urea, 2.5-10wt.% Ca(OH) 2and 80-95wt.% bentonite, and the pellet binder is in the form of powder, and its particle size content of less than 0.074mm is greater than or equal to 95wt.%. Its preparation method comprises the following steps:

[0038] P1. Digest quicklime with water to form Ca(OH) 2 Saturated solution, add Ca(OH) 2 Equal quality of urea, fully stirred evenly;

[0039] P2. Heat and stir the mixed solution to evaporate the mixed solution until the reactants are in a molten state; specifically, stir and heat the mixed solution at a constant temperature of 100-120° C. for 0.5-3 hours;

[0040] P3. Add bentonite to the above melt and add water, and stir evenly; specifically, the quality of the added bentonite is Ca(OH) 2 and 4-19 times the mass sum of urea, and add 5-8wt.% water by mass percentage, and then stir evenly;...

Embodiment 2

[0053] The pellet binder with desulfurization function in this embodiment is basically the same as the above-mentioned embodiment, the difference is that the pellet binder in this embodiment includes the following components in terms of mass percentage: 5wt.% urea, 5wt. .% Ca(OH) 2 and 90wt.% bentonite, when prepared:

[0054] In step P1: 5 parts by mass of Ca(OH) 2 The saturated lime water that makes mixes with 5 mass parts urea;

[0055] In step P2: Stir and heat the mixed solution at a constant temperature for 1 hour at 120°C;

[0056] In step P3: add 90 parts by mass of bentonite, and add 8 parts by mass of water, and mix vigorously; the quality of bentonite is Ca(OH) 2 and 9 times the mass sum of urea;

[0057] In step P4: place the mixture at room temperature for 12 hours, then place it in a microwave oven with the temperature controlled at 100° C., heat for 1 hour, and then finely grind the agglomerated material to a particle size of less than 0.074 mm and a content...

Embodiment 3

[0060] The pellet binder with desulfurization function of this embodiment is basically the same as the above-mentioned embodiment, the difference is that the pellet binder in this embodiment comprises the following components in terms of mass percentage: 10wt.% urea, 10wt. .% Ca(OH) 2 and 80wt.% bentonite, when prepared:

[0061] In step P1: 10 parts by mass of Ca(OH) 2 The saturated lime water that makes mixes with 10 mass parts urea;

[0062] In step P2: stirring and heating the mixed solution at a constant temperature for 3 hours at 100°C;

[0063] In step P3: add 80 parts by mass of bentonite, and add 5 parts by mass of water, and mix vigorously; the quality of bentonite is Ca(OH) 2 and 4 times the mass sum of urea;

[0064] In step P4: place the mixture at room temperature for 14 hours, then place it in a microwave oven with the temperature controlled at 80° C., heat for 2 hours, and then finely grind the agglomerated material to a particle size of less than 0.074 mm ...

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Abstract

The invention discloses a pelletizing binder with a desulfuration function and a preparation method and application of the pelletizing binder and belongs to the field of preparation of ferrous metallurgy blast furnace materials. The pelletizing binder with the desulfuration function contains the following components including, by weight, 2.5-10 wt.% of urea, 2.5-10 wt.% of Ca(OH)2 and 80-95 wt.% of bentonite. The pelletizing binder is powder which contains at least 95 wt.% of particles smaller than 0.074 mm in particle size. The defect of high cost of iron ore pellet production and desulfuration in the prior art is overcome. The pelletizing binder has the desulfuration function, can be applied to desulfuration in a pellet production process, can effectively reduce the content of SO2 in pellet smoke, relieves burden of a desulfuration system and does not affect normal pellet production. The preparation method has the advantages of being low in preparation cost and high in efficiency and is suitable for being applied and popularized.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy blast furnace charge preparation, and more specifically relates to a pellet binder with desulfurization function, a preparation method and application thereof. Background technique [0002] Pellets are one of the commonly used iron-containing materials for blast furnace smelting. During the preparation of pellets, iron-containing raw materials and fuels usually contain a certain amount of S, which will be oxidized to SO during the preheating and roasting process of the pellets. 2 into the exhaust. With the increasingly stringent environmental standards, the pellet plant must build supporting flue gas desulfurization devices to ensure that the exhaust emissions meet the standards. However, the investment and operation costs of flue gas desulfurization methods such as lime-gypsum method, ammonia method, activated carbon adsorption method, circulating fluidized bed method and dense...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/243
CPCC22B1/243
Inventor 余正伟龙红明春铁军孟庆民向爱平王毅璠任志祥狄瞻霞魏汝飞王平张中武钱立新章裕东丁龙
Owner 句容康泰膨润土有限公司
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