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A kind of high-performance fluidized lime and its production method

A high-performance, fluidized technology, applied in the field of fluidized lime and its production, can solve the problems of impeding moisture absorption and hydration of powdered quicklime, unsatisfactory hydrophobicity and fluidization effect, and short shelf life of activity. Achieve the effect of less impurities, low desulfurization cost and long shelf life

Active Publication Date: 2016-06-29
JIANGSU ZHENGDA FURNACE CHARGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Use physical methods to treat the surface of powdered quicklime with a passivating agent in a physical method. The composition is relatively low, which can achieve a good passivation effect, and at the same time ensure that the passivated powdered quicklime has a certain fluidity, effectively hinder The further moisture absorption and hydration of powdered quicklime are prevented; the passivated fluidized lime is generally used as a desulfurization agent for sintering in iron factories, but the existing active degree has a short shelf life, and the hydrophobicity and fluidization effect are not ideal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The present embodiment is a kind of high-performance fluidized fossil, wherein the weight percentage composition of powdery quicklime is: CaO: 92%, S: 0.08%, the balance is impurity; The weight of passivating agent is 2.5% of powdery quicklime weight ; The weight percent components of the passivator are: silicone oil: 86%, graphite powder: 2%, magnesium oxide: 3%, magnesium powder: 2%, fluorite: 5%, silicon carbide: 0.7%, phosphoric acid: 1% , lanthanide rare earth: 0.3%; the composition and weight percentage of lanthanide rare earth are: lanthanum: 36%, cerium: 14%, europium: 10%, terbium: 10%, gadolinium: 15%, praseodymium: 5%, holmium : 4%, erbium: 5%, other lanthanides: 1%.

[0031] The high-performance fluidized lime of this embodiment has an angle of repose (IC angle) less than 20°. For the high-performance fluidized lime of this embodiment, the ratio of its particle size ≤ 1mm is 100%, the ratio of its particle size ≤ 0.355mm is 99.8%, the ratio of its particle ...

Embodiment 2

[0038] This embodiment is a kind of high-performance fluidized fossil, wherein the weight percentage composition of powdery quicklime is: CaO: 93%, S: 0.02%, the balance is impurity; The weight of passivating agent is 2% of powdery quicklime weight ; The weight percent components of the passivator are: silicone oil: 89%, graphite powder: 3%, magnesium oxide: 2%, magnesium powder: 1%, fluorite: 3%, silicon carbide: 0.8%, phosphoric acid: 1% , lanthanide rare earth: 0.2%; the composition and weight percentage of lanthanide rare earth are: lanthanum: 40%, cerium: 15%, europium: 5%, terbium: 12%, gadolinium: 10%, praseodymium: 9%, holmium : 5%, erbium: 2%, other lanthanides: 2%.

[0039] The high-performance fluidized lime of this embodiment has an angle of repose (IC angle) less than 20°. For the high-performance fluidized lime of this embodiment, the ratio of its particle size ≤ 1mm is 100%, the ratio of its particle size ≤ 0.355mm is 99.8%, the ratio of its particle size ≤ 0.1...

Embodiment 3

[0046] This embodiment is a kind of high-performance fluidized fossil, wherein the weight percentage composition of powdery quicklime is: CaO: 95%, S: 0.01%, the balance is impurity; The weight of passivating agent is 1.5% of powdery quicklime weight ; The weight percent components of the passivator are: silicone oil: 88%, graphite powder: 4%, magnesium oxide: 1%, magnesium powder: 1%, fluorite: 2%, silicon carbide: 0.9%, phosphoric acid: 3% , lanthanide rare earth: 0.1%; the composition and weight percentage of lanthanide rare earth are: lanthanum: 25%, cerium: 6%, europium: 8%, terbium: 13%, gadolinium: 22%, praseodymium: 6%, holmium : 9%, erbium: 10%, other lanthanides: 1%.

[0047] The high-performance fluidized lime of this embodiment has an angle of repose (IC angle) less than 20°. For the high-performance fluidized lime of this embodiment, the ratio of its particle size ≤ 1mm is 100%, the ratio of its particle size ≤ 0.355mm is 99.8%, the ratio of its particle size ≤ 0...

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Abstract

The invention relates to a high-performance fluidized lime. The high-performance fluidized lime is prepared by coating the surface of powdery quicklime with a passivating agent, the powdery quicklime comprises 90wt% or more of CaO, 0.08wt% or less of S, and the balance of impurities; the weight of the passivating agent is not greater than 2.5% of the weight of the powdery quicklime; and the passivating agent comprises 86-90wt% of silicon oil, 2-4wt% of graphite powder, 1-3wt% of magnesium oxide, 1-2wt% of magnesium powder, 2-5wt% of fluorite, 0.7-0.9wt% of silicon carbide, 1-3wt% of phosphoric acid, and 0.1-0.3wt% of lanthanide rare earth, and the sum of the above component is 100%. The high-performance fluidized lime product has the advantages of high content of CaO, few impurities, long activity guaranteeing period and good fluid effect, can be used as an iron plant sintering desulfurizer, and is suitable for a molten iron pretreatment compounding blowing technology.

Description

technical field [0001] The invention relates to a fluidized lime and a production method thereof, in particular to a high-performance fluidized lime and a production method thereof. Background technique [0002] With the development of science and technology, various industries have higher and higher requirements on the quality of steel products, especially the strict restrictions on the content of harmful element S. Sulfur has adverse effects on the hot workability of steel, steel plate toughness, hydrogen-induced crack resistance and welding performance. High sulfur content in molten steel will cause crack defects in continuous casting slabs. Removing sulfur in metals has always been a key issue in iron and steel metallurgy. One of the basic tasks of production. Limestone is calcined and decomposed to produce quicklime (CaO) that easily reacts with water in the air to become saltlime, its calcium oxide content and activity are greatly reduced, and it has no effect as a fl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C1/02C21C7/064C22B1/16
Inventor 黄正君黄泽铭瞿幼中徐玉林孙锦荣
Owner JIANGSU ZHENGDA FURNACE CHARGE
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