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Method for rapidly digesting sintered lime

A lime and rapid technology, applied in the field of metallurgy, can solve problems not involved in chemical reaction promotion methods, achieve the effects of improving overhumidity and material layer permeability, reducing solid fuel consumption, and increasing mineralization rate

Active Publication Date: 2022-07-08
天津市新天钢钢铁集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the above-mentioned patented technologies are mainly based on physical methods such as increasing the reaction area of ​​lime, increasing the reaction temperature, increasing agitation and increasing the reaction time to improve the digestion rate, and none of them involve the method of promoting chemical reactions.

Method used

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  • Method for rapidly digesting sintered lime

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1 used 3wt% ammonium chloride solution to digest lime, the mass ratio of lime and ammonium chloride solution was 4:3, and after the same digestion time in the digester, the lime digestibility reached 95%, and the comparative example Compared with the comparison example, it has increased by 15%; the temperature of the mixture reaches 85℃, which is 15℃ higher than that of the comparative example; the thickness of the material layer is 980mm, which is 30mm higher than that of the comparative example; the fuel consumption of sintering is 45.5kg / t, which is 0.5kg / t lower than that of the comparative example t; the drum strength is 79%, which is 1% higher than the comparison ratio; the ore-forming rate is 83%, which is 1% higher than the comparison ratio.

Embodiment 2

[0041]Example 2 used 3.5% ammonium chloride solution to digest lime, and the ratio of lime to solution was 8:5. After the same digestion time in the digester, the digestibility under lime reached 96%, which improved compared with the comparative example. 16%; the temperature of the mixture reaches 86°C, which is 16°C higher than that of the comparative example; the thickness of the material layer is 990mm, which is 40mm higher than that of the comparative example; the fuel consumption of sintering is 45kg / t, which is 1kg / t less than that of the comparative example; the drum strength is 79.5 %, the comparison ratio is increased by 1.5%; the metallogenic rate is 84%, and the comparison ratio is increased by 2%.

Embodiment 3

[0042] Example 3 uses 4% ammonium chloride solution to digest lime, the ratio of lime and solution is 2:1, and after the same digestion time in the digester, the lime digestibility reaches 97%, which is improved compared with the comparative example. 17%; the temperature of the mixture reaches 87°C, which is 17°C higher than that of the comparative example; the thickness of the material layer is 1000mm, which is 50mm higher than that of the comparative example; The strength is 80%, which is 2% higher than the comparison ratio; the ore-forming rate is 83.5%, which is 1.5% higher than the comparison ratio.

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Abstract

The invention relates to the technical field of metallurgy, in particular to a method for rapidly digesting sintered lime, which comprises the following steps of: adding an ammonium chloride solution and lime into a digester, rapidly reacting the ammonium chloride solution and the lime in the digester, and releasing part of ammonia gas when the temperature in the digester rises, collecting the dust and ammonia gas through a dust collecting device of the digester, and returning the ammonium chloride solution to form ammonia water again; slaked lime is laid on a batching belt, and the slaked lime is buried under a batching layer through a material overturning device so as to keep the material temperature; after the mixed material is mixed and granulated twice, the slaked lime is fully and uniformly mixed with the material, the slaked lime, the ore charge and the fuel enter a sintering machine to be sintered, and then granulation is performed until a finished product meeting the standard is produced. The slaked lime and the uniformity in the mixture are improved, the temperature of the mixture is increased, and the sintering performance is improved.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for rapidly digesting sintered lime. Background technique [0002] Lime is decomposed by high temperature calcination of limestone to decompose carbon dioxide, the main components are calcium oxide CaO, magnesium oxide MgO, silicon dioxide SiO 2 substance, also called quicklime. Lime that meets certain quality standards and is used in steel production is called metallurgical lime. Lime plays a very important role in the metallurgical industry. In the sintering production process and the steelmaking production process, the role of metallurgical lime is inseparable. In the process of sintering production, the digestion rate of lime is an important indicator of the activity of lime, which affects the temperature of the sinter mixture, the pelletizing performance of the mixture, and then affects the sintering quality of the sinter. The process in which quicklime reacts...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B2/06C22B1/16C22B1/243
CPCC04B2/06C22B1/16C22B1/243Y02P40/40
Inventor 王达顾凤义俞飞张金坤闫文凯韩萍李宏飞
Owner 天津市新天钢钢铁集团有限公司